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SUGIMOTO Hiroshi
Graduate School of Engineering / Department of Electrical and Electronic Engineering
Associate Professor

Researcher basic information

■ Research Keyword
  • nanomaterials
  • ナノフォトニクス
  • 量子ドット
■ Research Areas
  • Nanotechnology/Materials / Nanomaterials / Nanophotonics
  • Nanotechnology/Materials / Inorganic materials
■ Committee History
  • Apr. 2021 - Present, 応用物理学会関西支部, 幹事

Research activity information

■ Award
  • Apr. 2023 文部科学省, 文部科学大臣表彰 若手科学者賞

  • Nov. 2022 神戸大学, 令和4年度 学長表彰

  • Oct. 2021 神戸大学, 令和3年度 学長表彰

  • Nov. 2020 神戸大学, 優秀若手研究者賞・学長賞

  • Nov. 2017 応用物理学会, 応用物理学会講演奨励賞, コロイド状シリコンナノ粒子の広範囲サイズ制御とその光学特性

  • May 2013 European Materials Research Society, Young Scientist Award

  • The 19th International Microscopy Congress, Best Poster Award

■ Paper
  • Kana Kondo, Mojtaba Karimi Habil, Kojiro Senda, Masato Adachi, Kenta Morita, Tatsuo Maruyama, Hiroshi Sugimoto, Minoru Fujii
    Oct. 2024, ACS Applied Nano Materials
    [Refereed]
    Scientific journal

  • Hao-Tse Su, Shao-Yuan Liu, Minoru Fujii, Hiroshi Sugimoto, Yoshito Y. Tanaka, Teruki Sugiyama
    Abstract This study investigates the promotion of sodium chlorate (NaClO3) crystallization through optical trapping, enhanced by the addition of gold nanoparticles (AuNPs) and silicon nanoparticles (SiNPs). Using a focused laser beam at the air–solution interface of a saturated NaClO3 solution with AuNPs or SiNPs, the aggregates of these particles were formed at the laser focus, the nucleation and growth of metastable NaClO3 (m-NaClO3) crystals were induced. Continued laser irradiation caused these m-NaClO3 crystals to undergo repeated cycles of growth and dissolution, eventually transitioning to a stable crystal form. Our comparative analysis showed that AuNPs, due to their significant heating due to higher photon absorption efficiency, caused more pronounced size fluctuations in m-NaClO3 crystals compared to the stable behavior observed with SiNPs. Interestingly, the maximum diameter of the m-NaClO3 crystals that appeared during the size fluctuation step was consistent, regardless of nanoparticle type, concentration, or size. The crystallization process was also promoted by using polystyrene nanoparticles, which have minimal heating and electric field enhancement, suggesting that the reduction in activation energy for nucleation at the particle surface is a key factor. These findings provide critical insights into the mechanisms of laser-induced crystallization, emphasizing the roles of plasmonic heating, particle surfaces, and optical forces. Graphical abstract
    Springer Science and Business Media LLC, Aug. 2024, Photochemical & Photobiological Sciences
    Scientific journal

  • Jialu Song, Haruki Tanaka, Keisuke Moriasa, Hiroshi Sugimoto, Minoru Fujii
    Jul. 2024, ACS Applied Optical Materials
    [Refereed]
    Scientific journal

  • Masato Adachi, Hiroshi Sugimoto, Kenta Morita, Tatsuo Maruyama, Minoru Fujii
    A tumor microenvironment (TME)-responsive nanoprobe composed of a fluorescent dye-decorated silicon (Si) nanosphere core and a thin MnO2 shell is proposed for simple and intelligent detection of cancer cells. The Si nanosphere core with diameters of 100-200 nm provides environment-independent Mie scattering imaging, while, simultaneously, the MnO2 shell provides the capability to switch the on/off state of the dye fluorescence reacted to the glutathione (GSH) and/or H2O2 levels in a cancer cell. Si-MnO2 core-shell nanosphere probes are fabricated in a solution-based process from crystalline Si nanosphere cores. The fluorescence switching under exposure to GSH is demonstrated, and the mechanism is discussed based on detailed optical characterizations including single-particle spectroscopy. Different types of human cells are incubated with the nanoprobes, and a proof of concept experiment is performed. From the combination of the robust scattering images and GSH- and H2O2-sensitive fluorescence images, the feasibility of cancer cell detection by the multimodal nanoprobes is demonstrated.
    Jul. 2024, ACS applied materials & interfaces, 16(26) (26), 33963 - 33970, English, International magazine
    Scientific journal

  • Hiroshi Sugimoto, Minoru Fujii
    Jun. 2024, Chemical Physics Reviews
    [Refereed]
    Scientific journal

  • Haruki Tanaka, Shinnosuke Hotta, Tatsuki Hinamoto, Hiroshi Sugimoto, Minoru Fujii
    Jan. 2024, ACS Applied Nano Materials, English
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Jorge Olmos, Hiroshi Sugimoto, Minoru Fujii
    AbstractNanophotonics can enhance the inherent weak signal exhibited by chiral molecules in circular dichroism (CD) spectroscopy experiments. One mechanism to achieve this CD enhancement is based on increasing the optical chirality produced by nanophotonics antennas in their near‐field, where chiral molecules are placed. However, ascertaining whether this CD enhancement is reached presents significant experimental challenges due to the complexity of measuring near‐field optical chirality. Here, it is demonstrated that a local and single measurement of the degree of circular polarization in the far‐field enables quantifying near‐field CD enhancements. Thereby, based on this far‐field measurement, the optimal response of the antenna is predicted for enhanced chiral sensing. Experimental validation of this near‐to‐far‐field relation is provided for silicon spherical nanoantennas. The experimental results, supported by analytical theory and exact numerical simulations, can be interesting for the experimental characterization of devices capable of enhancing CD from a single far‐field Stokes measurement.
    Jan. 2024, Laser & Photonics Reviews, English
    Scientific journal

  • Keisuke Ozawa, Masato Adachi, Hiroshi Sugimoto, Minoru Fujii
    Optically resonant nanoparticles decorated with donor-acceptor molecular pairs have been attracting attentions for applications as nanoprobes in bioimaging and biosensing. We produce composite nanoparticles composed of donor-acceptor molecular pairs and...
    2024, Nanoscale, English
    Scientific journal

  • Hiroki Yoshikawa, Taiki Ueshima, Hiroshi Sugimoto, Jingchao Xu, Minoru Mizuhata, Minoru Fujii
    Dec. 2023, ACS Applied Nano Materials, English
    Scientific journal

  • Hidemasa Negoro, Hiroshi Sugimoto, Minoru Fujii
    AbstractA dielectric nanosphere with orthogonal electric dipole (ED) and magnetic dipole (MD) Mie resonances can be a nanoantenna radiating circularly polarized light in specific directions if the amplitudes and the phase relations are properly designed. First, theoretical calculations show that a silicon nanosphere illuminated with a linearly polarized plane wave radiates circularly polarized light at the wavelength in between the ED and MD resonances if the refractive index of a surrounding medium (nm) is ≈1.3; the ellipticity of the scattered light can be >0.99 when nm is in a 1.19–1.35 range. Size‐purified silicon nanospheres suspended in water (nm = 1.33) are then prepared, and the angle‐ and circular‐polarization‐resolved scattering spectra are studied. It is experimentally demonstrated that circularly polarized light is radiated in specific directions under linearly polarized plane wave illumination. The results also show that the wavelength of the radiation of circularly polarized light can be controlled in the whole visible range by controlling the silicon nanosphere diameter in 100–200 nm range.
    Oct. 2023, Advanced Optical Materials, English
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Shinji Hayashi, Hiroshi Sugimoto, Minoru Fujii, Dmitry V. Nesterenko, Zouheir Sekkat
    American Physical Society (APS), Sep. 2023, Physical Review B, 108(12) (12)
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Hiroki Kasai, Hiroshi Sugimoto, Minoru Fujii
    Abstract Narrow‐band Purcell enhancement for electric and magnetic dipole emitters by high‐order Mie resonances up to the magnetic and electric octupole modes of a silicon nanosphere antenna is experimentally demonstrated. Eu3+ complexes are attached on the surface of a silicon nanosphere 160 to 316 nm in diameter, and the photoluminescence and scattering properties are investigated. It is shown that the branching ratio of the 5D0→7Fj (j = 0–4) f‐f transitions of Eu3+ is controlled in a wide range by tuning the resonance wavelength of a silicon nanosphere by the size. Because of the high‐quality factor resonances, not only a specific 5D0→7Fj transition, but also a specific Stark sublevel transition whose spectral separation is 3–9 nm can be selectively enhanced by precisely controlling the size of a silicon nanosphere with the accuracy of ≈2 nm.
    Wiley, Aug. 2023, Advanced Optical Materials
    Scientific journal

  • Hiroaki Hasebe, Hiroshi Sugimoto, Yoshino Katsurayama, Taniyuki Furuyama, Minoru Fujii
    Abstract Photochemical reaction exploiting an excited triplet state (T1) of a molecule requires two steps for the excitation, i.e., electronic transition from the ground (S0) to singlet excited (S1) states and intersystem crossing to the T1 state. A dielectric metasurface coupled with photosensitizer that enables energy efficient photochemical reaction via the enhanced S0→T1 magnetic dipole transition is developed. In the direct S0→T1 transition, the photon energy of several hundreds of meV is saved compared to the conventional S0→ S1→T1 transition. To maximize the magnetic field intensity on the surface, a silicon (Si) nanodisk array metasurface with toroidal dipole resonances is designed. The surface of the metasurface is functionalized with ruthenium (Ru(II)) complexes that work as a photosensitizer for singlet oxygen generation. In the coupled system, the rate of the direct S0→T1 transition of Ru(II) complexes is 41‐fold enhanced at the toroidal dipole resonance of a Si nanodisk array. The enhancement of a singlet oxygen generation rate is observed when the toroidal dipole resonance of a Si nanodisk array is matched with the direct S0→T1 transition wavelength of Ru(II) complexes.
    Wiley, Jun. 2023, Small
    Scientific journal

  • Akira Matsumori, Hiroshi Sugimoto, Minoru Fujii
    Abstract A nanoantenna that has the capability to direct light to a preferred direction is of paramount importance in a variety of applications in nanophotonics. Directional light scattering by a nanoantenna is achieved by properly controlling the interference between the electric and magnetic multipolar modes. In this work, it is theoretically and experimentally demonstrated that introduction of a small perturbation, i.e., a formation of a notch, to a Mie resonant silicon nanosphere (Si NS) results in the formation of a unique structure exhibiting unidirectional transverse light scattering in the visible range. Based on comprehensive numerical simulations including exact multipole decomposition analyses, the mechanism of the unidirectional transverse scattering is discussed. It is also shown that a notched Si NS can generate a relatively large transverse optical force as the recoil of the unidirectional transverse scattering. Finally, notched Si NSs are fabricated by a solution‐based process. By combining incident‐angle resolved single particle scattering spectroscopy with numerical simulations, directional transverse light scattering of a notched Si NS is confirmed.
    Wiley, Jun. 2023, Laser & Photonics Reviews, 17(8) (8)
    Scientific journal

  • Hidemasa Negoro, Hiroshi Sugimoto, Minoru Fujii
    American Chemical Society (ACS), May 2023, Nano Letters, 23(11) (11), 5101 - 5107
    Scientific journal

  • Keisuke Moriasa, Hiroaki Hasebe, Hiroshi Sugimoto, Minoru Fujii
    A structure composed of a hexagonal array of Si nanodisks having toroidal dipole resonances and a reflecting mirror separated by a SiO2 spacer is proposed as a platform that exhibits narrow-band perfect absorption in the Si sub-bandgap wavelength range for a CMOS compatible Si based photodetector operating below the bandgap range. The numerical simulation reveals that the structure possesses Fabry–Pérot bound states in the continuum at proper spacer thicknesses due to the interference between the toroidal dipole and its image dipole. By slightly detuning the spacer thickness to meet the critical coupling condition, narrow-band perfect absorption appears despite assumption of a very small extinction coefficient (5 × 10−4). The wavelength of the perfect absorption is controlled in a wide range by the structural parameters of a Si nanodisk hexagonal array and is insensitive to the fluctuation of the extinction coefficient and the choice of a metallic mirror. In the structure, over 90% of incident power can be absorbed in the Si region. This suggests that the structure can be used as a narrow-band photodetector operating in the Si sub-bandgap wavelength range. We also evaluate the sensing performance of the proposed structure as an intensity based refractive index sensor operating in the near-infrared range.
    AIP Publishing, May 2023, Journal of Applied Physics, 133(17) (17)
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Daisuke Shima, Hiroshi Sugimoto, Artyom Assadillayev, Søren Raza, Minoru Fujii
    Wiley, Mar. 2023, Advanced Optical Materials, 2203107 - 2203107
    Scientific journal

  • Izzah Machfuudzoh, Tatsuki Hinamoto, F. Javier García de Abajo, Hiroshi Sugimoto, Minoru Fujii, Takumi Sannomiya
    American Chemical Society (ACS), Mar. 2023, ACS Photonics, 10(5) (5), 1434 - 1445
    Scientific journal

  • Tadasha Jena, Md Tarik Hossain, Upasana Nath, Manabendra Sarma, Hiroshi Sugimoto, Minoru Fujii, P. K. Giri
    Abstract Surface-enhanced Raman spectroscopy (SERS), a very powerful tool for the identification of molecular species, has relied mostly on noble metal-based substrates to obtain a high enhancement factor. In this work, we demonstrate that self-driven intrinsic defects in 2D palladium di-selenide (PdSe2) dendrites grown at low temperature (280 °C) act as hotspots for high SERS enhancement. We grow 2D dendritic PdSe2 with ample intrinsic defects to exploit it for SERS application. X-ray electron spectroscopy (XPS) analysis reveals 9.3% outer layer and 4.7% interior Se vacancies. A detailed examination of atomic-scale defects revealed Se vacancy (VSe) coupled with Se–Pd–Se vacancy (VSe-Pd-Se) in monolayer PdSe2, and an array of line defects (Se vacancies) and nanopores in bilayer PdSe2 dendrites. Interestingly, our studies reveal that Se vacancy-rich PdSe2 gives rise to line defects that act like hotspots for SERS enhancement. Remarkably, the vacancy-rich dendritic PdSe2 shows a SERS enhancement factor >105 and can detect RhB at a concentration down to 10−8  M. We speculate that the topological line defects and the edge construction in PdSe2 dendrites act as metallic wire or edge, which is partly responsible for the high enhancement in the SERS signal. The high SERS sensitivity is explained on the basis of multiple charge transfer processes combined with the predicted metal-like behavior of the defected 2D PdSe2. Our conclusions are fully supported by the density functional theory calculation of the electronic density of states of the defective bilayer (2L) PdSe2, which remarkably exhibits metallic character. Being a defect-enabled SERS substrate, dendritic 2D PdSe2 fills the gap between conventional plasmonic SERS substrate and plasmon-free SERS substrate.
    Springer Science and Business Media LLC, Feb. 2023, npj 2D Materials and Applications, 7(1) (1)
    Scientific journal

  • Masato Adachi, Hiroshi Sugimoto, Yuya Nishimura, Kenta Morita, Chiaki Ogino, Minoru Fujii
    Wiley, Jan. 2023, Small, 2207318 - 2207318
    Scientific journal

  • Sumana Paul, Joydip Ghosh, Md Tarik Hossain, Hiroaki Hasebe, Hiroshi Sugimoto, Minoru Fujii, Pravat K. Giri
    Oct. 2022, The Journal of Physical Chemistry C
    [Refereed]
    Scientific journal

  • Yinggang Wang, Hiroshi Sugimoto, Minoru Fujii
    American Chemical Society ({ACS}), Sep. 2022, The Journal of Physical Chemistry C, 126(38) (38), 16401 - 16408, English
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Hiroaki Hasebe, Keisuke Moriasa, Kaito Yamashita, Hiroshi Sugimoto, Minoru Fujii
    American Chemical Society ({ACS}), Sep. 2022, ACS Photonics, English
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Hiroshi Sugimoto
    A dielectric core-metal shell nanosphere has attracted scientific and technological interests due to the unique optical resonances arising from the hybridization of surface plasmon modes and cavity modes. The previous studies focus on a low-index dielectric core without its own optical resonances. Here, optical resonances of a core-shell nanosphere with a high refractive index (n approximate to 4) core with the lowest order Mie resonances in the visible range are investigated theoretically and experimentally. Scattering and absorption spectra of a core-shell nanosphere for different values of the core refractive index are first analyzed, and there is a transition of the hybridization scheme around n approximate to 2. Above the value, a characteristic hybridized mode with strong absorption and weak scattering emerges in the near-infrared range. A core-shell nanosphere composed of a silicon core and a gold shell is prepared, and the resonance modes are studied by single particle scattering spectroscopy and electron energy loss spectroscopy (EELS) in a transmission electron microscope. The core-shell nanospheres exhibit the hybridized modes depending on the core diameter. The hybridized mode as well as the higher order one that is not observable in the scattering spectroscopy is observed in the EELS.
    Wiley, Sep. 2022, Small, 18(45) (45), 2204890 - 2204890, English
    Scientific journal

  • Hiroshi Sugimoto
    Controlling ultraviolet light at the nanoscale using optical Mie resonances holds great promise for a diverse set of applications, such as lithography, sterilization, and biospectroscopy. Access to the ultraviolet requires materials with a high refractive index and wide band gap energy. Here, the authors systematically search for such materials by computing the frequency-dependent optical permittivity of 338 binary semiconductors and insulators from first principles, and evaluate their scattering properties using Mie theory. This analysis reveals several interesting candidate materials among which boron phosphide (BP) appears most promising. Then BP nanoparticles are prepared and it is demonstrated that they support Mie resonances at visible and ultraviolet wavelengths using both far-field optical measurements and near-field electron energy-loss spectroscopy. A laser reshaping method is also presented to realize spherical Mie-resonant BP nanoparticles. With a refractive index over three and low absorption losses in a broad spectral range spanning from the infrared to the near ultraviolet, BP is an appealing material for a broad range of applications in dielectric nanophotonics.
    Wiley, Aug. 2022, Advanced Optical Materials, 10(16) (16), 2200422 - 2200422, English
    Scientific journal

  • Minoru Fujii, Hiroshi Sugimoto
    Jul. 2022, ECS Meeting Abstracts
    [Invited]
    Scientific journal

  • Hiroto Shinomiya, Hiroshi Sugimoto, Tatsuki Hinamoto, Yan Joe Lee, Mark L. Brongersma, Minoru Fujii
    American Chemical Society ({ACS}), May 2022, ACS Photonics, 9(5) (5), 1741 - 1747, English
    Scientific journal

  • Tatsuki Hinamoto, Yea-Shine Lee, Sina Abedini Dereshgi, Jennifer G. DiStefano, Roberto dos Reis, Hiroshi Sugimoto, Koray Aydin, Minoru Fujii, Vinayak P. Dravid
    Wiley, Apr. 2022, Small, 18(17) (17), 2200413 - 2200413, English
    Scientific journal

  • Akira Matsumori, Hiroshi Sugimoto, Minoru Fujii
    Wiley, Apr. 2022, Advanced Optical Materials, 10(8) (8), 2102574 - 2102574, English
    Scientific journal

  • Hidemasa Negoro, Hiroshi Sugimoto, Tatsuki Hinamoto, Minoru Fujii
    Wiley, Apr. 2022, Advanced Optical Materials, 10(8) (8), 2102750 - 2102750, English
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Saskia Fiedler, P. Elli Stamatopoulou, Artyom Assadillayev, Christian Wolff, Hiroshi Sugimoto, Minoru Fujii, N. Asger Mortensen, S{\o}ren Raza, Christos Tserkezis
    American Chemical Society ({ACS}), Mar. 2022, Nano Letters, 22(6) (6), 2320 - 2327, English
    [Refereed]
    Scientific journal

  • Miho Takada, Kosuke Inoue, Hiroshi Sugimoto, Minoru Fujii
    The photoelectrochemical response of a photocathode made from a colloidal solution of boron (B) and phosphorus (P) codoped silicon (Si) quantum dots (QDs) 2-11 nm in diameters is studied. Since codoped Si QDs are dispersible in alcohol and water due to the hydrophilic surface, a photoelectrode with a smooth surface is produced by drop-coating the QD solution on an indium tin oxide substrate. The codoping provides high oxidation resistance to Si QDs and makes the electrode operate as a photocathode. The photoelectrochemical response of a Si QD photoelectrode depends strongly on the size of QDs; there is a transition from anodic to cathodic photocurrent around 4 nm in diameter. Below the size, anodic photocurrent due to self-oxidation of Si QDs is observed, while above the size, cathodic photocurrent due to electron transfer across the interface is observed. The cathodic photocurrent increases with increasing the size, and in some samples, it is observed for more than 3000 s under intermittent light irradiation.
    {IOP} Publishing, Nov. 2021, Nanotechnology, 32(48) (48), 485709 - 485709, English, International magazine
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Hiroshi Sugimoto, Minoru Fujii
    {IOP} Publishing, Nov. 2021, Nanotechnology, 32(45) (45), 452001 - 452001
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • R. Turansk{\'{y } }, J. Brndiar, A. Pershin, {\'{A } }. Gali, H. Sugimoto, M. Fujii, I. {\v{S } }tich
    American Chemical Society ({ACS}), Oct. 2021, The Journal of Physical Chemistry C, 125(42) (42), 23267 - 23274, English
    Scientific journal

  • Hiroshi Sugimoto, Hiroaki Hasebe, Taniyuki Furuyama, Minoru Fujii
    Wiley, Oct. 2021, Small, 17(47) (47), 2104458 - 2104458, English
    Scientific journal

  • Artyom Assadillayev, Tatsuki Hinamoto, Minoru Fujii, Hiroshi Sugimoto, S{\o}ren Raza
    Abstract Tunable high-refractive-index nanostructures are highly desired for realizing photonic devices with a compact footprint. By harnessing the large thermo-optic effect in silicon, we show reversible and wide thermal tuning of both the far- and near-fields of Mie resonances in isolated silicon nanospheres in the visible range. We perform in situ heating in a transmission electron microscope and electron energy-loss spectroscopy to show that the Mie resonances exhibit large spectral shifts upon heating. We leverage the spectral shifts to demonstrate near-field tuning between different Mie resonances. By combining electron energy-loss spectroscopy with energy-dispersive X-ray analysis, we show a reversible and stable operation of single silicon nanospheres up to a temperature of 1073 K. Our results demonstrate that thermal actuation offers dynamic near-field tuning of Mie resonances, which may open up applications in tunable nonlinear optics, Raman scattering, and light emission.
    Walter de Gruyter {GmbH}, Oct. 2021, Nanophotonics, English
    Scientific journal

  • Minoru FUJII, Hiroshi Sugimoto, Shinya Kano
    A core/shell silicon (Si) quantum dot (QD) composed of a crystalline Si core and an amorphous shell, in which boron (B) and phosphorus (P) are very heavily doped, is developed. Because of the amorphous shell, the B and P codoped Si QDs exhibit significantly different physical and chemical properties from undoped ones. The codoped Si QDs are dispersible in polar solvents such as water and alcohol without organic ligands and exhibit stable luminescence in water. Because of the superior properties, the codoped Si QDs have applications in different fields including photonics, biophotonics, photochemistry and electronics. In this article, we discuss the structure and optical and electrical properties of the codoped core/shell Si QDs and show the application potentials in different fields.
    {IOP} Publishing, Aug. 2021, Japanese Journal of Applied Physics, 61(SA) (SA), English
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Artyom Assadillayev, Tatsuki Hinamoto, Minoru Fujii, Hiroshi Sugimoto, Mark L. Brongersma, S{\o}ren Raza
    American Chemical Society ({ACS}), Jun. 2021, ACS Photonics, 8(6) (6), 1582 - 1591, English
    Scientific journal

  • Hiroshi Sugimoto, Minoru Fujii
    American Chemical Society ({ACS}), Jun. 2021, ACS Photonics, 8(6) (6), 1794 - 1800, English
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Wanyin Ge, Jindou Shi, Meimei Xu, Yuanting Wu, Hiroshi Sugimoto, Minoru Fujii
    Elsevier {BV}, Mar. 2021, Optical Materials, 113, 110822 - 110822, English
    Scientific journal

  • Sugimoto, Hiroshi, Fujii, Minoru
    Wiley, Feb. 2021, Advanced Photonics Research, n/a(n/a) (n/a), 2000111 - 2000111
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Hinamoto, Tatsuki, Hamada, Mikihiko, Sugimoto, Hiroshi, Fujii, Minoru
    Wiley, Feb. 2021, Advanced Optical Materials, n/a(n/a) (n/a), 2002192 - 2002192
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Okazaki, Takuma, Sugimoto, Hiroshi, Hinamoto, Tatsuki, Fujii, Minoru
    2021, ACS Applied Materials & Interfaces, 13(11) (11)
    Scientific journal

  • Pavelka, Ondřej, Dyakov, Sergey, Veselý, Jozef, Fučíková, Anna, Sugimoto, Hiroshi, Fujii, Minoru, Valenta, Jan
    The Royal Society of Chemistry, 2021, Nanoscale, 13
    Scientific journal

  • Asuka Inoue, Hiroshi Sugimoto, Yozo Sugimoto, Kensuke Akamatsu, Marie Hubalek Kalbacova, Chiaki Ogino, Minoru Fujii
    Cambridge University Press ({CUP}), Dec. 2020, MRS Communications, 10(4) (4), 680 - 686
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Hiroshi Sugimoto, Hao Zhou, Miho Takada, Junichiro Fushimi, Minoru Fujii
    The photocatalytic hydrogen (H-2) generation by boron (B) and phosphorus (P) codoped silicon quantum dots (Si QDs) with diameters in the quantum confinement regime is investigated. The codoped Si QDs have an amorphous shell made from B, Si and P. The shell induces negative potential on the surface and makes codoped Si QDs dispersible in water. The hydrophilic shell offers enhanced stability and efficiency in photocatalytic H(2)generation and provides the opportunity to study the size dependence of the H(2)generation rate. A drastic increase of H(2)generation rate with decreasing QD size is observed. Analyses based on the Marcus theory reveal that the upper shift of the lowest unoccupied molecular orbital level of Si QDs by the quantum confinement effect is responsible for the enhanced photocatalytic activity.
    ROYAL SOC CHEMISTRY, Aug. 2020, JOURNAL OF MATERIALS CHEMISTRY A, 8(31) (31), 15789 - 15794, English
    [Refereed]
    Scientific journal

  • Minoru Fujii, Riku Fujii, Miho Takada, Hiroshi Sugimoto
    American Chemical Society ({ACS}), Jun. 2020, ACS Applied Nano Materials, 3(6) (6), 6099 - 6107
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Jing Huang, Jingjian Zhou, Tommy Haraldsson, Alden Clemments, Minoru Fujii, Hiroshi Sugimoto, Bo Xu, Ilya Sychugov
    Luminescent solar concentrator (LSC) is a promising technology to integrate semitransparent photovoltaic (PV) systems into modern buildings and vehicles. Silicon quantum dots (QDs) are good candidates as fluorophores in LSCs, due to the absence of overlap between absorption and emission spectra, high photoluminescence quantum yield (PLQY), good stability, nontoxicity, and element abundance. Herein, LSCs based on Si QDs/polymer nanocomposites are fabricated in a triplex glass configuration. A special polymer matrix (off-stoichiometric thiol-ene, OSTE) is used, which improves Si nanocrystal quantum yield. Herein, a comprehensive investigation to improve the performance of LSCs by exploring different strategies under the guidance of a theoretical description is conducted. Among these strategies, the systematical enhancement of PLQY of the nanocomposite is achieved by tuning the thiol/allyl group ratio in the OSTE matrix. In addition, ligand selection and loading optimization for QDs reduce the total scattering loss in the device. Finally, an optical power efficiency of 7.9% is achieved for an optimized LSC prototype (9 x 9 x 0.6 cm(3), transmittance approximate to 62% at 500 nm) based on Si QDs/OSTE nanocomposite, which shows good potential of this material system in LSC fabrication.
    WILEY-V C H VERLAG GMBH, Jun. 2020, SOLAR RRL, English
    [Refereed]
    Scientific journal

  • Hiroshi Sugimoto, Takuma Okazaki, Minoru Fujii
    A crystalline silicon (Si) nanoparticle (NP) of 100-200 nm in diameter exhibits a highly saturated color owing to Mie resonance, and can be a component to realize angle-insensitive structural color covering the entire visible range. However, to date, coloring a substrate by Si nanostructures has only been achieved in a very small area by using electron beam lithography and dry etching processes. In this work, a Si NP color ink capable of coloring a flexible substrate by a painting process is developed. The sphericity of Si NPs is very high; the circularity factor obtained from a transmission electron microscope image reaches 0.97. The average diameter of Si nanospheres is controlled from 95 to 200 nm, and the polydispersity defined by the standard deviation divided by the average diameter is as small as 6%. Because of the high sphericity, high crystallinity, high size purity, and perfect dispersion in solution, the Si nanosphere solutions exhibit vivid colors recognizable by naked eye in a range of blue to orange. The Si nanosphere color inks combined with a polymer binder are capable of coloring flexible substrates by a painting process.
    WILEY-V C H VERLAG GMBH, Jun. 2020, ADVANCED OPTICAL MATERIALS, 8(12) (12), English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Minoru Fujii, Hiroshi Sugimoto
    The Electrochemical Society, May 2020, ECS Meeting Abstracts, {MA}2020-01(16) (16), 1061 - 1061
    [Refereed]
    Scientific journal

  • Minoru Fujii, Akiko Minami, Hiroshi Sugimoto
    Gel electrophoresis, which is a standard method for separation and analysis of macromolecules such as DNA, RNA and proteins, is applied for the first time to silicon (Si) quantum dots (QDs) for size separation. In the Si QDs studied, boron (B) and phosphorus (P) are simultaneously doped. Codoping induces a negative potential on the surface of a Si QD and makes it dispersible in water. Si QDs with different B and P concentrations and grown at different temperatures (950 degrees C-1200 degrees C) are studied. It is shown that native polyacrylamide gel electrophoresis can separate codoped Si QDs by size. The capability of gel electrophoresis to immobilize size-separated QDs in a solid matrix makes detailed analyses of size-purified Si QDs possible. For example, the photoluminescence (PL) studies of the dried gel of Si QDs grown at 1100 degrees C demonstrate that a PL spectrum of a Si QD solution with the PL maximum around 1.4 eV can be separated into more than 15 spectra with the PL maximum changing from 1.2 to 1.8 eV depending on the migration distance. It is found that the relationship between the PL peak energy and the migration distance depends on the growth temperature of Si QDs as well as the B and P concentration. For all the samples with different impurity concentrations and grown at different temperatures, a clear trend is observed in the relationship between the full width at half maximum (FWHM) and the peak energy of the PL spectra in a wide energy range. The FWHM increases with the increasing peak energy and it is nearly twice larger than those observed for undoped Si QDs. The large PL FWHM of codoped Si QDs suggests that excitons are further localized in codoped Si QDs due to the existence of charged impurities.
    ROYAL SOC CHEMISTRY, Apr. 2020, NANOSCALE, 12(16) (16), 9266 - 9271, English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Keita Nomoto, Hiroshi Sugimoto, Anna Ceguerra, Minoru Fujii, Simon P. Ringer
    The microstructure of boron (B) and phosphorus (P) codoped silicon (Si) nanocrystals (NCs), cubic boron phosphide (BP) NCs and their mixed NCs (BxSiyPz NCs) has been studied using atom probe tomography (APT), transmission electron microscopy (TEM), and Raman scattering spectroscopy. The BxSiyPz NCs inherit superior properties of B and P codoped Si NCs such as high dispersibility in aqueous media and near infrared (NIR) luminescence and those of cubic BP NCs such as high chemical stability. The microanalyses revealed that BxSiyPz NCs are composed of a crystalline core and an amorphous shell. The core possesses a lattice constant between that of Si (diamond-cubic) and BP (cubic). The amorphous shell is comprised of B, Si and P, though the composition is not uniform and there are local B-rich, Si-rich and P-rich domains connected contiguously. The amorphous shell is proposed to be responsible for their superior chemical properties such as high dispersibility in polar solvents and high resistance to acids, and the crystalline core is responsible for the stable NIR luminescence.
    ROYAL SOC CHEMISTRY, Apr. 2020, NANOSCALE, 12(13) (13), 7256 - 7262, English
    [Refereed]
    Scientific journal

  • John A. Parker, Hiroshi Sugimoto, Brighton Coe, Daniel Eggena, Minoru Fujii, Norbert F. Scherer, Stephen K. Gray, Uttam Manna
    Although the study of nonradiating anapoles has long been part of fundamental physics, the dynamic anapole at optical frequencies was only recently experimentally demonstrated in a specialized silicon nanodisk structure. We report excitation of the electrodynamic anapole state in isotropic silicon nanospheres using radially polarized beam illumination. The superposition of equal and out-of-phase amplitudes of the Cartesian electric and toroidal dipoles produces a pronounced dip in the scattering spectra with the scattering intensity almost reaching zero-a signature of anapole excitation. The total scattering intensity associated with the anapole excitation is found to be more than 10 times weaker for illumination with radially vs linearly polarized beams. Our approach provides a simple, straightforward alternative path to realizing nonradiating anapole states at the optical frequencies.
    AMER PHYSICAL SOC, Mar. 2020, PHYSICAL REVIEW LETTERS, 124(9) (9), English
    [Refereed]
    Scientific journal

  • Hiroshi Sugimoto
    Jan. 2020, ACS Applied Materials & Interfaces, English
    [Refereed]
    Scientific journal

  • Hasebe, Hiroaki, Sugimoto, Hiroshi, Hinamoto, Tatsuki, Fujii, Minoru
    2020, Advanced Optical Materials, 8(22) (22), 2001148 - 2001148
    Scientific journal

  • Hinamoto, Tatsuki, Hotta, Shinnosuke, Sugimoto, Hiroshi, Fujii, Minoru
    2020, Nano Letters, 20(10) (10)
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Uttam Manna, Hiroshi Sugimoto, Daniel Eggena, Brighton Coe, Ren Wang, Mahua Biswas, Minoru Fujii
    Resonant excitation and manipulation of complex interactions among two or more resonances in high-index dielectric nanostructures provide great opportunities for engineering novel optical phenomena and applications. However, difficulties often arise when interpreting the observed spectra because of the overlap of the broad resonances contributed by many factors such as particle size, shape, and background index. Therefore, selective excitation of resonances that spectrally overlap with each other provides a gateway towards an improved understanding of the complex interactions. Here, we demonstrate selective excitation and enhancement of multipolar resonances of silicon nanospheres using cylindrical vector beams (CVBs) with different diameters of nanospheres and numerical apertures (NAs) of the excitations. By combining single particle spectroscopy and electrodynamic simulations, we show that the radially polarized beam can selectively excite the electric multipoles, whereas the azimuthally polarized beam can selectively excite the magnetic multipoles even though multipolar resonances are convoluted together due to their spectral overlap. Moreover, focusing the CVBs with high NA can lead to a dominant longitudinal polarization of the electric or magnetic field. We show that the enhanced longitudinal polarization with increasing NA of the radially and azimuthally polarized beams can selectively enhance the electric and magnetic multipolar resonances, respectively. Our approach can be used as a spectroscopy tool to enhance and identify multipolar resonances leading to a better understanding of light-matter interactions in other dielectric nanostructures as well as serve as a first step toward excitation of dark mode and Fano resonances in dielectric oligomers by breaking the symmetry of the nanostructures. Published under license by AIP Publishing.
    AMER INST PHYSICS, Jan. 2020, JOURNAL OF APPLIED PHYSICS, 127(3) (3), English
    [Refereed]
    Scientific journal

  • Sugimoto, Hiroshi, Imaizumi, Ryosuke, Hinamoto, Tatsuki, Kawashima, Takahiro, Fujii, Minoru
    It has been demonstrated recently that a nanowire (NW) of high refractive index dielectric materials works as a nanoantenna because of the excitation of the Mie-type resonances. Here, we explore the capability of a silicon (Si) NW as an optical nanoantenna by combining it with an external metallic component. We investigate the light scattering property of a single Si NW placed on a gold (Au) mirror via a very thin dielectric spacer and demonstrate strong confinement of electromagnetic fields in the gap because of the coupling of the resonance modes with a Au mirror. We demonstrate that the resonance wavelength of the hybrid mode can be tuned by the gap length, and the hybrid gap mode strongly modifies the spectral shape of the emission from a quantum dot (QD) monolayer incorporated in the gap. Quantitative analyses of the data in combination with numerical simulations reveal that the enhancement and the polarization control of the QD emission are achieved by the coupling.
    AMER CHEMICAL SOC, 2020, ACS Applied Nano Materials, 3(7) (7), 7223 - 7230, English
    [Refereed]
    Scientific journal

  • Hiroto Yanagawa, Tatsuki Hinamoto, Takashi Kanno, Hiroshi Sugimoto, Masahiko Shioi, Minoru Fujii
    © 2019 Author(s). Nanoimprinting followed by metal deposition is a low-cost, high-throughput, and highly reproducible process for the fabrication of large-size plasmonic substrates required for commercial products. However, the plasmonic substrates prepared by the process usually have very broad surface plasmon resonances, which cannot be well reproduced by numerical simulations. The poor agreement between experiments and calculations has prevented the detailed analysis of the field enhancement behavior and the improvement of the performance as plasmonic substrates. In this work, we demonstrate that large-area plasmonic substrates with sharp surface plasmon resonances, which can be well reproduced by numerical simulations, are produced by sputter-deposition of gold (Au) on a commercially available nanoimprinted substrate. The good agreement between experiments and simulations allow us to identify the locations and field distributions of the hot spots. The angle dependence of specular reflectance and diffuse reflectance measurements in combination with numerical simulations reveal that a dipolelike bright mode and a higher-order dark mode exist at gaps between Au nanorods. Finally, we demonstrate the application of the developed plasmonic substrates for surface-enhanced fluorescence in sandwich immunoassays for the detection of influenza virus nucleoprotein. We show that the sharp resonance and the capability of precise tuning of the resonance wavelength significantly enhance the luminescence signal.
    AMER INST PHYSICS, Dec. 2019, Journal of Applied Physics, 126(22) (22), English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Hiroshi Sugimoto
    Oct. 2019, ACS Applied Nano Materials, English
    [Refereed]
    Scientific journal

  • Tatsuki Hinamoto, Tomoki Higashiura, Hiroshi Sugimoto, Minoru Fujii
    Copyright © 2019 American Chemical Society. A stand-alone plasmonic nanocomposite into which a metal nanostructure and an emitting material are integrated is a promising building block for optoelectronics and biophotonics devices. Here, we present the plasmonic property of a nanocomposite composed of a Au elongated nanocap and a β-NaYF4 dielectric nanorod. We show that elongation of a Au nanocap results in splitting of the magnetic dipole resonance, and the resonance wavelengths can be controlled in a wide wavelength range by the aspect ratio. As an application of the elongated nanocap, we demonstrate strong enhancement of the near-infrared to visible upconversion of an Er3+ and Yb3+ doped β-NaYF4 nanorod by tuning the resonance wavelength of a Au nanocap placed on it to the excitation wavelength.
    Oct. 2019, Journal of Physical Chemistry C, 123(42) (42), 25809 - 25815, English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Hiroshi Sugimoto
    Oct. 2019, Solar Energy Materials and Solar Cells, English
    [Refereed]
    Scientific journal

  • Hiroshi Sugimoto
    Oct. 2019, Advanced Optical Materials, English
    [Refereed]
    Scientific journal

  • Hiroshi Sugimoto
    Oct. 2019, Acta Materialia, English
    [Refereed]
    Scientific journal

  • Hiroshi Sugimoto, Bálint Somogyi, Toshiyuki Nakamura, Hao Zhou, Yuichi Ichihashi, Satoru Nishiyama, Adam Gali, Minoru Fujii
    Copyright © 2019 American Chemical Society. Cubic boron phosphide (BP) is an indirect band gap semiconductor with a band gap of 2.0 eV and promising for a highly stable photocatalyst to produce hydrogen from water under visible light irradiation. Here, we performed a comprehensive study on the energy-level structure and photocatalytic activity of BP nanocrystals (NCs) in the quantum confinement regime (<5 nm in diameter). First, we calculated the electronic structure of cubic BP NCs up to 2.8 nm in diameter, hexagonal BP nanoflakes, and cubic/hexagonal BP nanostructures by density functional theory and time-dependent density functional theory. We then synthesized BP NCs with 2-13 nm in diameters and performed detailed structural analyses and optical measurements. The photocatalytic bleaching experiments for dye molecules under visible light irradiation revealed that the bleaching rate depends strongly on the size of BP NCs; the increase in the band gap of BP NCs by the quantum size effects (QSE) enhanced the photocatalytic activity. The band gap increase by the QSE also enhanced the rate of photocatalytic hydrogen evolution in water.
    Sep. 2019, Journal of Physical Chemistry C, 123(37) (37), 23226 - 23235, English
    [Refereed]
    Scientific journal

  • Hiroto Yanagawa, Asuka Inoue, Hiroshi Sugimoto, Masahiko Shioi, Minoru Fujii
    © The Author(s) 2019. A process for bioconjugation of an IgG antibody and silicon quantum dots (Si-QDs) having the luminescence in the near-infrared (NIR) range was developed. For the bioconjugation, the surface of water-soluble all-inorganic Si-QDs was functionalized by using silane-coupling agents. In amino-functionalized Si-QDs, successful conjugation was achieved without strongly affecting the luminescence property. Detailed analyses revealed that Si-QDs are bound covalently to both the light and heavy chains of an IgG antibody. It was also confirmed that the binding property of an IgG antibody with antigen nucleoprotein was not ruined by the process. The successful conjugation of an IgG antibody and NIR luminescent Si-QDs paves the way for designing environmentally friendly bio-sensing and -imaging processes.
    CAMBRIDGE UNIV PRESS, Sep. 2019, MRS Communications, 9(3) (3), 1079 - 1086, English
    [Refereed]
    Scientific journal

  • Hiroshi Sugimoto
    Abstract
    Sep. 2019, MRS Communications, English
    [Refereed]
    Scientific journal

  • Kosuke Inoue, Takuya Kojima, Hiroshi Sugimoto, Minoru Fujii
    Jan. 2019, The Journal of Physical Chemistry C, 123(2) (2), 1512 - 1518, English
    [Refereed]
    Scientific journal

  • Asuka Inoue, Hiroshi Sugimoto, Minoru Fujii

    The antimicrobial activity of a hybrid nanoparticle (NP) composed of a silver (Ag) NP core decorated with silicon (Si) nanocrystals (NCs) on the exterior (Ag/Si NPs) is evaluated.

    2019, RSC Advances, 9(27) (27), 15171 - 15176, English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Hiroshi Sugimoto, Masataka Yamamura, Riku Fujii, Minoru Fujii
    © 2018 American Chemical Society. Shallow impurity doping is an efficient route to tailor optical and electronic features of semiconductor quantum dots (QDs). However, the effect of doping is often smeared by the size, shape, and composition inhomogeneities. In this paper, we study optical properties of almost monodispersed spherical silicon (Si) QDs that are heavily doped with boron (B) and phosphorus (P). The narrow size distribution achieved by a size-separation process enables us to extract doping-induced phenomena clearly. The degree of doping-induced shrinkage of the optical band gap is obtained in a wide size range. Comparison of the optical band gap with theoretical calculations allow us to estimate the number of active donor-acceptor pairs in a QD. Furthermore, we found that the size and detection energy dependence of the luminescence decay rate is significantly modified below a critical diameter, that is ∼5.5 nm. In the diameter range above 5.5 nm, the luminescence decay rate is distributed in a wide range depending on the detection energy even in size-purified Si QDs. The distribution may arise from that of donor-acceptor distances. On the other hand, in the diameter range below 5.5 nm the detection energy dependence of the decay rate almost disappears. In this size range, which is smaller than twice of the effective Bohr radius of B and P in bulk Si crystal, the donor-acceptor distance is not a crucial factor to determine the recombination rate.
    American Chemical Society ({ACS}), Nov. 2018, Nano Letters, 18(11) (11), 7282 - 7288, English
    [Refereed]
    Scientific journal

  • Resonant dielectric nanoparticles as efficient nanoantennas in optical regime
    Hiroshi Sugimoto, Minoru Fujii
    © 2018 OSA - The Optical Society. All rights reserved. We fabricate the colloidal Si nanoantenna exhibiting efficient Mie resonances in optical regime. The hybrid nanogap antenna structures prepared by a bottom-up approach showed the Purcell enhanced emission of QD layer integrated in the gap.
    2018, Optics InfoBase Conference Papers, Part F125-JSAP 2018
    [Refereed]
    International conference proceedings

  • Fujii, Minoru, Sugimoto, Hiroshi, Kano, Shinya
    2018, Chemical Communications, 54(35) (35)
    [Refereed]
    Scientific journal

  • Kojima, Takuya, Sugimoto, Hiroshi, Fujii, Minoru
    2018, Journal of Physical Chemistry C, 122(3) (3), English
    [Refereed]
    Scientific journal

  • Sugimoto, Hiroshi, Yamamura, Masataka, Sakiyama, Makoto, Fujii, Minoru
    2018, Nanoscale, 10(16) (16), English
    [Refereed]
    Scientific journal

  • Sugimoto, Hiroshi, Fujii, Minoru
    2018, Acs Photonics, 5(5) (5), English
    [Refereed]
    Scientific journal

  • Ohata, Yuki, Sugimoto, Hiroshi, Fujii, Minoru
    2018, Nanoscale, 10(16) (16), English
    [Refereed]
    Scientific journal

  • Belinova, Tereza, Vrabcova, Lucie, Machova, Iva, Fucikova, Anna, Valenta, Jan, Sugimoto, Hiroshi, Fujii, Minoru, Kalbacova, Marie Hubalek
    2018, Physica Status Solidi B-Basic Solid State Physics, 255(10) (10), 1 - 5, English
    [Refereed]
    Scientific journal

  • Sakiyama, Makoto, Sugimoto, Hiroshi, Fujii, Minoru
    2018, Nanoscale, 10(29) (29), 13902 - 139007, English
    [Refereed]
    Scientific journal

  • Sugimoto, Hiroshi, Yashima, Shiho, Fujii, Minoru
    2018, Acs Photonics, 5(8) (8), 3421 - 3427, English
    [Refereed]
    Scientific journal

  • Hinamoto, Tatsuki, Sugimoto, Hiroshi, Fujii, Minoru
    2018, Journal of Physical Chemistry C, 122(30) (30), 17465 - 17472, English
    [Refereed]
    Scientific journal

  • Minami, Akiko, Sugimoto, Hiroshi, Crowe, Iain F., Fujii, Minoru
    2018, Journal of Physical Chemistry C, 122(36) (36), 21069 - 21075, English
    [Refereed]
    Scientific journal

  • Sugimoto, Hiroshi, Yamamura, Masataka, Fujii, Riku, Fujii, Minoru
    2018, Nano Letters, 18(11) (11), 7282 - 7288, English
    [Refereed]
    Scientific journal

  • Limpens, Rens, Sugimoto, Hiroshi, Neale, Nathan R., Fujii, Minoru
    2018, Acs Photonics, 5(10) (10), 4037 - 4045, English
    [Refereed]
    Scientific journal

  • Lin, Hui, Imakita, Kenji, Fujii, Minoru, Sun, Chang, Chen, Bingdi, Kanno, Takashi, Sugimoto, Hiroshi
    2017, Journal of Alloys and Compounds, 691, 860 - 865, English
    [Refereed]
    Scientific journal

  • Mazurak, A., Mroczynski, R., Jasinski, J., Tanous, D., Majkusiak, B., Kano, S., Sugimoto, H., Fujii, M., Valenta, J.
    2017, Microelectronic Engineering, 178, English
    [Refereed]
    Scientific journal

  • Ashkenazi, Or, Azulay, Doron, Balberg, Isaac, Kano, Shinya, Sugimoto, Hiroshi, Fujii, Minoru, Millo, Oded
    2017, Nanoscale, 9(45) (45), English
    [Refereed]
    Scientific journal

  • Sugimoto, Hiroshi, Ozaki, Yusuke, Fujii, Minoru
    2017, Acs Applied Materials & Interfaces, 9(22) (22), English
    [Refereed]
    Scientific journal

  • Yanagawa, Hiroto, Inoue, Asuka, Sugimoto, Hiroshi, Shioi, Masahiko, Fujii, Minoru
    2017, Journal of Applied Physics, 122(22) (22), English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Inoue, Asuka, Sugimoto, Hiroshi, Fujii, Minoru
    2017, Journal of Physical Chemistry C, 121(21) (21), English
    [Refereed]
    Scientific journal

  • Sugimoto, Hiroshi, Fujii, Minoru
    2017, Advanced Optical Materials, 5(17) (17), English
    [Refereed]
    Scientific journal

  • Sugimoto, Hiroshi, Hori, Yusuke, Imura, Yusuke, Fujii, Minoru
    2017, Journal of Physical Chemistry C, 121(21) (21), English
    [Refereed]
    Scientific journal

  • Hinamoto, Tatsuki, Takashina, Hiroyuki, Sugimoto, Hiroshi, Fujii, Minoru
    2017, Journal of Physical Chemistry C, 121(14) (14), 8077 - 8083, English
    [Refereed]
    Scientific journal

  • Sugimoto Hiroshi, Fujii Minoru, Bjorn M.Reinhard, Luca Dal Negro
    神戸大学大学院工学研究科, May 2016, Memoirs of the Graduate Schools of Engineering and System Informatics Kobe University, 7, 17 - 20, English
    [Refereed]
    Research institution
    Link to Kobe Univ. Repository (Kernel)

  • Sasaki, Masato, Kano, Shinya, Sugimoto, Hiroshi, Imakita, Kenji, Fujii, Minoru
    2016, Journal of Physical Chemistry C, 120(1) (1)
    [Refereed]
    Scientific journal

  • Hori, Yusuke, Kano, Shinya, Sugimoto, Hiroshi, Imakita, Kenji, Fujii, Minoru
    2016, Nano Letters, 16(4) (4)
    [Refereed]
    Scientific journal

  • Almeida, A. J., Sugimoto, H., Fujii, M., Brandt, M. S., Stutzmann, M., Pereira, R. N.
    2016, Physical Review B, 93(11) (11)
    [Refereed]
    Scientific journal

  • Nomoto, Keita, Gutsch, Sebastian, Ceguerra, Anna V., Breen, Andrew, Sugimoto, Hiroshi, Fujii, Minoru, Perez-Wurfl, Ivan, Ringer, Simon P., Conibeer, Gavin
    2016, Mrs Communications, 6(4) (4), 469 - 469
    [Refereed]
    Scientific journal

  • Sugimoto, H., Fujii, M., Imakita, K.
    2016, Nanoscale, 8(21) (21), 10956 - 10962, English
    [Refereed]
    Scientific journal

  • Fujii, Minoru, Sugimoto, Hiroshi, Imakita, Kenji
    2016, Nanotechnology, 27(26) (26), English
    [Refereed]
    Scientific journal

  • Ostrovska, Lucie, Broz, Antonin, Fucikova, Anna, Belinova, Tereza, Sugimoto, Hiroshi, Kanno, Takashi, Fujii, Minoru, Valenta, Jan, Kalbacova, Marie Hubalek
    2016, Rsc Advances, 6(68) (68), 63403 - 63413, English
    [Refereed]
    Scientific journal

  • Sugimoto, Hiroshi, Yashima, Shiho, Furuta, Kenta, Inoue, Asuka, Fujii, Minoru
    2016, Applied Physics Letters, 108(24) (24), English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Inoue, Asuka, Sugimoto, Hiroshi, Yaku, Hidenobu, Fujii, Minoru
    2016, Rsc Advances, 6(68) (68), 63933 - 63939, English
    [Refereed]
    Scientific journal

  • Nomoto, Keita, Sugimoto, Hiroshi, Breen, Andrew, Cezguerra, Anna V., Kanno, Takashi, Ringer, Simon P., Wurfl, Ivan Perez, Conibeer, Gavin, Fujii, Minoru
    2016, Journal of Physical Chemistry C, 120(31) (31), English
    [Refereed]
    Scientific journal

  • Nomoto, Keita, Gutsch, Sebastian, Ceguerra, Anna V., Breen, Andrew, Sugimoto, Hiroshi, Fujii, Minoru, Perez-Wurfl, Ivan, Ringer, Simon P., Conibeer, Gavin
    2016, MRS Communications, 6(3) (3), English
    [Refereed]
    Scientific journal

  • Kanno, Takashi, Kano, Shinya, Sugimoto, Hiroshi, Tada, Yasuhiro, Fujii, Minoru
    2016, Mrs Communications, 6(4) (4), English
    [Refereed]
    Scientific journal

  • Kanno, Takashi, Sugimoto, Hiroshi, Fucikova, Anna, Valenta, Jan, Fujii, Minoru
    2016, Journal of Applied Physics, 120(16) (16), English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Sugimoto, Hiroshi, Furuta, Kenta, Fujii, Minoru
    2016, Journal of Physical Chemistry C, 120(42) (42), 24469 - 24475, English
    [Refereed]
    Scientific journal

  • Yashima, Shiho, Sugimoto, Hiroshi, Takashina, Hiroyuki, Fujii, Minoru
    2016, Journal of Physical Chemistry C, 120(50) (50), 28795 - 28801, English
    [Refereed]
    Scientific journal

  • Inoue, Asuka, Fujii, Minoru, Sugimoto, Hiroshi, Imakita, Kenji
    2015, Journal of Physical Chemistry C, 119(44) (44)
    [Refereed]
    Scientific journal

  • Sugimoto, Hiroshi, Fujii, Minoru, Imakita, Kenji
    2015, Rsc Advances, 5(11) (11)
    [Refereed]
    Scientific journal

  • Nakamura, Toshihiro, Adachi, Sadao, Fujii, Minoru, Sugimoto, Hiroshi, Miura, Kenta, Yamamoto, Shunya
    2015, Physical Review B, 91(16) (16)
    [Refereed]
    Scientific journal

  • Sugimoto, Hiroshi, Chen, Tianhong, Wang, Ren, Fujii, Minoru, Reinhard, Bjoern M., Dal Negro, Luca
    2015, Acs Photonics, 2(9) (9)
    [Refereed]
    Scientific journal

  • Sugimoto, H., Imakita, K., Fujii, M.
    2015, Rsc Advances, 5(119) (119)
    [Refereed]
    Scientific journal

  • Sugimoto, Hiroshi, Zhang, Ran, Reinhard, Bjoern M., Fujii, Minoru, Perotto, Giovanni, Marelli, Benedetto, Omenetto, Fiorenzo G., Dal Negro, Luca
    2015, Applied Physics Letters, 107(4) (4)
    [Refereed]
    Scientific journal

  • Furuta, Kenta, Fujii, Minoru, Sugimoto, Hiroshi, Imakita, Kenji
    2015, Journal of Physical Chemistry Letters, 6(14) (14)
    [Refereed]
    Scientific journal

  • Wang, Yu, Sugimoto, Hiroshi, Inampudi, Sandeep, Capretti, Antonio, Fujii, Minoru, Dal Negro, Luca
    2015, Applied Physics Letters, 106(24) (24)
    [Refereed]
    Scientific journal

  • Sugimoto, Hiroshi, Fujii, Minoru, Imakita, Kenji
    2014, Nanoscale, 6(21) (21)
    [Refereed]
    Scientific journal

  • Fujii, Minoru, Sugimoto, Hiroshi, Hasegawa, Masataka, Imakita, Kenji
    2014, Journal of Applied Physics, 115(8) (8)
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Kanno, Takashi, Fujii, Minoru, Sugimoto, Hiroshi, Imakita, Kenji
    2014, Journal of Materials Chemistry C, 2(28) (28)
    [Refereed]
    Scientific journal

  • Sugimoto, Hiroshi, Fujii, Minoru, Fukuda, Yuki, Imakita, Kenji, Akamatsu, Kensuke
    2014, Nanoscale, 6(1) (1)
    [Refereed]
    Scientific journal

  • Apr. 2013, The Journal of Physical Chemistry C, English
    [Refereed]
    Scientific journal

  • Hiroshi Sugimoto, Minoru Fujii, Kenji Imakita, Shinji Hayashi, Kensuke Akamatsu
    The surface structure of P and B codoped colloidal Si-NCs are studied by photoluminescence (PL) in hydrofluoric acid (HF) solution and X-ray photoelectron spectroscopy (XPS). We find that codoped Si-NCs are much more stable in HF solution than undoped, P-doped, and B-doped Si-NCs. The PL study combined with XPS results reveal that a high B concentration layer is formed on the surface of codoped Si-NCs and the layer acts as a kind of inorganic atomic ligands for Si-NCs. The high B concentration layer makes Si-NCs hydrophilic and dispersible in polar liquids. Furthermore, the layer effectively protects Si-NCs from oxidation in solution and in air. © 2013 American Chemical Society.
    Apr. 2013, Journal of Physical Chemistry C, 117(13) (13), 6807 - 6813, English
    [Refereed]
    Scientific journal

  • Sugimoto, H., Fujii, M., Imakita, K., Hayashi, S., Akamatsu, K.
    2013, Journal of Physical Chemistry C, 117(22) (22)
    [Refereed]
    Scientific journal

  • 長谷川 正高, 杉本 泰, 藤井 稔, 今北 健二, 林 真至
    公益社団法人 応用物理学会, Aug. 2012, 応用物理学会学術講演会講演予稿集, 2012.2, 2655 - 2655, Japanese

  • Hiroshi Sugimoto, Minoru Fujii, Kenji Imakita, Shinji Hayashi, Kensuke Akamatsu
    We demonstrate the formation of a new type of surfactant-free colloidal silicon nanocrystal (Si-NC). The characteristic structural feature of the Si-NCs is simultaneous doping of phosphorus (P) and boron (B) in and on the surface of Si-NCs. The codoped Si-NCs are stable in methanol for more than a year and exhibit luminescence in the near-infrared range. We perform comprehensive studies on the structure of codoped colloidal Si-NCs and discuss the mechanism of the high solution dispersibility. © 2012 American Chemical Society.
    Aug. 2012, Journal of Physical Chemistry C, 116(33) (33), 17969 - 17974, English
    [Refereed]
    Scientific journal

  • Aug. 2012, The Journal of Physical Chemistry C, English
    [Refereed]
    Scientific journal

  • Masatoshi Fukuda, Minoru Fujii, Hiroshi Sugimoto, Kenji Imakita, Shinji Hayashi
    Si nanocrystals (Si-NCs) dispersible in polar liquid without surface functionalization by organic molecules have been realized by simultaneously doping n and p type impurities. We show that the codoped Si-NCs are stable in methanol for more than five months, while intrinsic Si-NCs prepared by the same procedure form large agglomerates. The different behavior of the intrinsic and codoped Si-NCs in solutions suggests that doped impurities exist on the surface of Si-NCs and the surface potential is large enough to prevent the agglomeration. The colloidal solution of codoped Si-NCs exhibits broad photoluminescence with the maximum in the near infrared range (1:1-1:3 eV). © 2011 Optical Society of America.
    Oct. 2011, Optics Letters, 36(20) (20), 4026 - 4028, English
    [Refereed]
    Scientific journal

  • Oct. 2011, Optics Letters, English
    [Refereed]
    Scientific journal

  • Hiroshi Sugimoto, Minoru Fujii, Masatoshi Fukuda, Kenji Imakita, Shinji Hayashi
    Boron (B) doped Si nanocrystals (Si-ncs) dispersed in hydrofluoric (HF) acid solution are prepared by dissolving borosilicate films containing B-doped Si-ncs in HF solution. We find that the etching rate of B-doped Si-ncs is much smaller than that of undoped Si-ncs. The difference of the etching rate allows us to extract only doped Si-ncs in the mixture of doped and undoped Si-ncs and observe the photoluminescence (PL) due to the transition from the conduction band to the acceptor state. The PL was very broad with the maximum around 1.15 eV. From the analysis of the PL data obtained for the samples prepared under different conditions and different etching time, preferential doping sites of B atoms are estimated. The data suggests that B-doped Si-ncs consists of intrinsic cores and heavily B-doped shells. © 2011 American Institute of Physics.
    Sep. 2011, Journal of Applied Physics, 110(6) (6), 063528, English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Sep. 2011, Journal of Applied Physics, English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

■ MISC
  • 誘電体ナノアンテナのMie共鳴によるスピン反転を伴う遷移の増強
    杉本 泰, 藤井 稔
    Lead, Oct. 2021, 理論化学会誌 フロンティア, (12) (12)
    [Refereed][Invited]

  • Mie共鳴により発色するシリコンナノ粒子の構造色インクへの応用
    杉本 泰, 藤井 稔
    Lead, Jul. 2021, 塗装工学
    [Invited]

  • Hiroshi SUGIMOTO, Takuma OKAZAKI, Minoru FUJII
    Lead, Japan Society of Colour Material, 20 Apr. 2021, Journal of the Japan Society of Colour Material, 94(4) (4), 96 - 99
    [Refereed][Invited]
    Introduction scientific journal

  • Mie共鳴により発色するナノ粒子カラーインクの創製
    杉本 泰
    Lead, Feb. 2021, 月間OPTRONICS
    [Invited]

  • Mie共鳴により発色するナノ粒子インク
    杉本 泰, 藤井 稔
    Lead, Jan. 2020, コンバーテック
    [Invited]

  • Fujii Minoru, Sugimoto Hiroshi, Kano Shinya
    Jul. 2016, SPIE Newsroom, English
    [Refereed]
    Report scientific journal

  • Si nanocrystals dispersible in polar liquids without functionalization by organic molecules
    藤井 稔, 杉本 泰, 今北 健二, 林 真至
    大阪大学超高圧電子顕微鏡センター, 2012, 大阪大学超高圧電子顕微鏡センター年報, (41) (41), 22 - 24, Japanese

■ Books And Other Publications
  • 量子ドット・マイクロLEDディスプレイと関連材料の技術開発 (Technical Development of Quantum-dot・Micro LED Display and their Material)
    SUGIMOTO Hiroshi, FUJII Minoru
    Others, ㈱シーエムシー･リサーチ, Mar. 2018, Japanese
    Scholarly book

  • Silicon Nanomaterials Sourcebook, Low-Dimensional Structures Nanopowders, Nanowires
    SUGIMOTO Hiroshi, FUJII Minoru
    Others, CRC Press, Aug. 2017, English
    Scholarly book

  • 量子ドット材料の技術と応用展開
    SUGIMOTO Hiroshi, FUJII Minoru
    Others, 情報機構, Jun. 2017, Japanese
    Scholarly book

  • Micro- and Nanophotonic Technologies
    Patrick Meyrueis, Kazuaki Sakoda, Marcel Van de Voorde, SUGIMOTO HIROSHI, FUJII MINORU
    Joint work, Wiley, Mar. 2017, English, ISBN: 9783527340378
    Scholarly book

■ Lectures, oral presentations, etc.
  • Experimental Demonstration of Magnetic Purcell Enhancement by Magnetic Resonance of Silicon Nanospheres
    Hiroshi Sugimoto, Minoru Fujii
    2021 Materials Research Society, Fall Meeting, Dec. 2021

  • Spherical Silicon Nanoparticle Color Inks Enabled by Mie Resonances
    Hiroshi Sugimoto, Takuma Okazaki, Minoru Fujii
    第67回応用物理学会春季学術講演会, Mar. 2020, Japanese, TOKYO, Japan, Domestic conference
    Oral presentation

  • Colloidal Solution of Silicon Nanospheres for All Dielectric Metafluid
    Tatsuki Hinamoto, Shinnosuke Hotta, Hiroshi Sugimoto, Minoru Fujii
    第67回応用物理学会春季学術講演会, Mar. 2020, Japanese, TOKYO, Japan, Domestic conference
    Oral presentation

  • Hydrogen evolution by silicon quantum dot photocatalyst
    Miho Takada, Hiroshi Sugimoto, Minoru Fujii
    第67回応用物理学会春季学術講演会, Mar. 2020, Japanese, TOKYO, Japan, Domestic conference
    Oral presentation

  • Mie 共鳴により発色するシリコンナノ粒子インク
    Takuma Okazaki, Hiroshi Sugimoto, Minoru Fujii
    2019年 神戸大学研究基盤センター「若手フロンティア研究会2019」, Dec. 2019, Japanese, KOBE, Japan, Domestic conference
    Poster presentation

  • シリコン量子ドット光触媒による水素生成
    Miho Takada, Hao Zhou, Hiroshi Sugimoto, Minoru Fujii
    2019年 神戸大学研究基盤センター「若手フロンティア研究会2019」, Dec. 2019, Japanese, KOBE, Japan, Domestic conference
    Poster presentation

  • シリコン量子ドットの電気泳動
    Akiko Minami, Hiroshi Sugimoto, Minoru Fujii
    2019年 神戸大学研究基盤センター「若手フロンティア研究会2019」, Dec. 2019, Japanese, KOBE, Japan, Domestic conference
    Poster presentation

  • 高屈折率誘電体ナノディスクアレイの光学応答制御
    Hiroaki Hasebe, Tatsuki Hinamoto, Hiroshi Sugimoto, Minoru Fujii
    2019年 神戸大学研究基盤センター「若手フロンティア研究会2019」, Dec. 2019, Japanese, KOBE, Japan, Domestic conference
    Poster presentation

  • 高屈折率誘電体ナノワイヤの光学特性
    Ryosuke Imaizumi, Tatsuki Hinamoto, Hiroshi Sugimoto, Minoru Fujii
    2019年 神戸大学研究基盤センター「若手フロンティア研究会2019」, Dec. 2019, Japanese, KOBE, Japan, Domestic conference
    Poster presentation

  • Dielectric Meta-atoms Exhibiting Optical Magnetism
    Tatsuki Hinamoto, Hiroshi Sugimoto, Minoru Fujii
    第30回 光物性研究会, 2019, Japanese, KYOTO, Japan, Domestic conference
    Poster presentation

  • Controlling Emission of WS2 Monolayer with a Spherical Silicon Mie Resonator
    Tatsuki Hinamoto, Yan Joe Lee, Soren Laza, Hiroshi Sugimoto, Minoru Fujii, Mark Brongersma
    MRS Fall Meeting & Exhibit, 2019, English, BOSTON, United States, International conference, Co-authored internationally
    Oral presentation

  • Engineering directional scattering of Mie resonator
    Tatsuki Hinamoto, Mikihiko Hamada, Hiroshi Sugimoto, Minoru Fujii
    The International Symposium on Plasmonics and Nano-photonics (iSPN2019), 2019, English, KOBE, Japan, International conference
    Poster presentation

  • Colloidal Silicon Nanoresonators for All-Dielectric Photonics
    Hiroshi Sugimoto, Tatsuki Hinamoto, Minoru Fujii
    The International Symposium on Plasmonics and Nano-photonics (iSPN2019), 2019, English, KOBE, Japan, International conference
    Poster presentation

  • Resonant Silicon Nanoparticles as Efficient Optical Nanoantennas
    Hiroshi Sugimoto, Minoru Fujii
    IUMRS-ICA 2019, 20th International Union of Materials Research Societies Conference, 2019, English, PERTH, Australia, International conference
    Oral presentation

  • Directional optical nanoantenna by an interference between Mie resonance of high-refractive-index dielectric nanosphere and LSPR of metal nanocap
    Mikihiko Hamada, Tatsuki Hinamoto, Hiroshi Sugimoto, Minoru Fujii
    第80回応用物理学会秋季学術講演会, Sep. 2019, Japanese, HOKKAIDO, Japan, Domestic conference
    Oral presentation

  • Silicon Nanoparticle Ink Showing Color by Mie Resonance
    Takuma Okazaki, Hiroshi Sugimoto, Minoru Fujii
    第80回応用物理学会秋季学術講演会, Sep. 2019, Japanese, HOKKAIDO, Japan, Domestic conference
    Oral presentation

  • Controlling Emission of WS2 Monolayer with a Spherical Silicon Mie Resonator
    Tatsuki Hinamoto, Yan Joe Lee, Soren Laza, Hiroshi Sugimoto, Minoru Fujii, Mark Brongersma
    第80回応用物理学会秋季学術講演会, Sep. 2019, Japanese, HOKKAIDO, Japan, Domestic conference, Co-authored internationally
    Oral presentation

  • Cyclic Voltammetry of Silicon Quantum Dots
    Kosuke Inoue, Hiroshi Sugimoto, Minoru Fujii
    第80回応用物理学会秋季学術講演会, Sep. 2019, Japanese, HOKKAIDO, Japan, Domestic conference
    Oral presentation

  • Electrophoresis of Silicon Quantum Dots
    Akiko Minami, Hiroshi Sugimoto, Minoru Fujii
    第80回応用物理学会秋季学術講演会, Sep. 2019, Japanese, HOKKAIDO, Japan, Domestic conference
    Oral presentation

  • Hydrogen Evolution by Silicon Quantum Dot Photocatalyst
    Hao Zhou, Hiroshi Sugimoto, Minoru Fujii
    第80回応用物理学会秋季学術講演会, Sep. 2019, Japanese, HOKKAIDO, Japan, Domestic conference
    Oral presentation

  • Colloidal Silicon Nanoparticles for Photonic Color Inks
    Hiroshi Sugimoto, Takuma Okazaki, Minoru Fujii
    第80回応用物理学会秋季学術講演会, Sep. 2019, Japanese, HOKKAIDO, Japan, Domestic conference
    Oral presentation

  • Fabrication of high-index dielectric nanodisk arrays and their optical responses (I)
    Hiroaki Hasebe, Tatsuki Hinamoto, Hiroshi Sugimoto, Minoru Fujii
    第80回応用物理学会秋季学術講演会, Sep. 2019, Japanese, HOKKAIDO, Japan, Domestic conference
    Poster presentation

  • Hydrogen evolution by silicon quantum dot photocatalyst
    Miho Takada, Hao Zhou, Hiroshi Sugimoto, Minoru Fujii
    第80回応用物理学会秋季学術講演会, Sep. 2019, Japanese, HOKKAIDO, Japan, Domestic conference
    Poster presentation

  • All-Inorganic Colloidal Silicon Quantum Dots Codoped with Boron and Phosphorus
    Hiroshi Sugimoto
    European Materials Research Society 2019 Spring Meeting, May 2019, English, NICE, France, International conference
    [Invited]
    Oral presentation

  • Size Dependent Donor and Acceptor Pair Recombination in Colloidal Silicon Quantum Dots
    Hiroshi Sugimoto, Minoru Fujii
    MRS Spring Meeting & Exhibit, 2019, English, PHOENIX, United States, International conference
    Oral presentation

  • Hybridized Plasmonic Gap Mode in Gold Nanorod on Mirror Nanoantenna for Spectrally Tailored Emission Enhancement
    Hiroshi Sugimoto, Minoru Fujii
    MRS Spring Meeting & Exhibit, 2019, English, PHOENIX, United States, International conference
    Oral presentation

  • Luminescence property of boron and phosphorus co-doped silicon quantum dots
    Minoru Fujii, Hiroshi Sugimoto
    The 7th International Conference on Light-Emitting Devices and Their Industrial Applications (LEDIA2019) in Optics & Photonics International Congress 2019, 2019, English, KANAGAWA, Japan, International conference
    [Invited]
    Oral presentation

  • 不純物をドープした単分散シリコン量子ドットの発光特性（II）
    Hiroshi Sugimoto, FUJII Riku, Minoru Fujii
    第66回応用物理学会春季学術講演会, 2019, Japanese, Domestic conference
    Oral presentation

  • 金属基板上の高屈折率誘電体ナノワイヤの光学特性(II)
    Ryousuke Imaizumi, Tatsuki Hinamoto, Hiroshi Sugimoto, Minoru Fujii
    第66回応用物理学会春季学術講演会, 2019, Japanese, Domestic conference
    Oral presentation

  • シリコン量子ドット-タンパク質間相互作用によるプロテインコロナ形成
    Asuka Inoue, Youzou Sugimoto, Hiroshi Sugimoto, Minoru Fujii
    第66回応用物理学会春季学術講演会, 2019, Japanese, Domestic conference
    Oral presentation

  • シリコン量子ドットsupraparticleの開発
    Riku Fujii, Miho Takada, Hiroshi Sugimoto, Minoru Fujii
    第66回応用物理学会春季学術講演会, 2019, Japanese, Domestic conference
    Oral presentation

  • 単分散シリコン量子ドットの開発と発光特性
    Riku Fujii, Masataka Yamamura, Hiroshi Sugimoto, Minoru Fujii
    2018年 第79回応用物理学会秋季術講演会, 2018, Japanese, Domestic conference
    Oral presentation

  • 単一窒化チタンナノ粒子の光散乱特性評価
    Youichi Ikuno, Hiroshi Sugimoto, Minoru Fujii
    2018年 第79回応用物理学会秋季術講演会, 2018, Japanese, Domestic conference
    Poster presentation

  • 水分散性シリコン量子ドットの光誘起電荷移動
    Kousuke Inoue, Takuya Kojima, Hiroshi Sugimoto, Minoru Fujii
    2018年 第79回応用物理学会秋季術講演会, 2018, Japanese, Domestic conference
    Oral presentation

  • 水分散性シリコン量子ドットの近赤外時間ゲートバイオイメージング応用に関する研究
    Asuka Inoue, Hiroshi Sugimoto, Makoto Sakiyama, Minoru Fujii
    2018年 第79回応用物理学会秋季術講演会, 2018, Japanese, Domestic conference
    Poster presentation

  • 高屈折率誘電体球のMie共鳴と金属ナノキャップのLSPRの干渉に基づく指向性光ナノアンテナ
    Mikihiko Hamada, Tatsuki Hinamoto, Hiroshi Sugimoto, Minoru Fujii
    2018年 第79回応用物理学会秋季術講演会, 2018, Japanese, Domestic conference
    Oral presentation

  • 高屈折率誘電体ナノワイヤの光学特性(I)
    Ryousuke Imaizumi, Hiroshi Sugimoto, Minoru Fujii
    2018年 第79回応用物理学会秋季術講演会, 2018, Japanese, Domestic conference
    Poster presentation

  • 広範囲にサイズ制御したコロイドシリコンナノ粒子の光学特性
    SUGIMOTO Hiroshi, FUJII Minoru
    2018年 第66回応用物理学会春季学術講演会, 2018, Japanese, Domestic conference
    Invited oral presentation

  • 金属イオンによるシリコン量子ドット薄膜の量子ドット間架橋
    Yusuke Imura, Hiroshi Sugimoto, Minoru Fujii
    2018年 第79回応用物理学会秋季術講演会, 2018, Japanese, Domestic conference
    Poster presentation

  • 可視応答型光触媒を指向したBoron Phosphideナノ結晶の開発（I）
    Toshiyuki Nakamura, Hiroshi Sugimoto, Minoru Fujii
    2018年 第79回応用物理学会秋季術講演会, 2018, Japanese, Domestic conference
    Oral presentation

  • ホウ素とリンを同時ドープしたシリコン量子ドットの成長機構
    MINAMI Akiko, SUGIMOTO Hiroshi, FUJII Minoru
    2018年 第67回応用物理学会春季学術講演会, 2018, Japanese, Domestic conference
    Oral presentation

  • シリコンナノ結晶シェルを有する高安定性銀ナノ粒子の抗菌作用に関する研究
    Asuka Inoue, Hiroshi Sugimoto, BYUNGJI Kim, Michael J. Sailor, Minoru Fujii
    2018年 第79回応用物理学会秋季術講演会, 2018, Japanese, Domestic conference
    Oral presentation

  • Visualizing core-shell structure of heavily doped silicon quantum dots by electron microscope using atomically thin support film
    Hiroshi Sugimoto, Makoto Sakiyama, Minoru Fujii
    19th International Microscopy Congress (IMC19), 2018, English, International conference
    Poster presentation

  • Silicon Nanocrystal Shell Hybrid Nanoparticle as Antimicrobial Agent
    Asuka inoue, Hiroshi Sugimoto, Byungji Kim, Michael J. Sailor, Minoru Fujii
    2018 MRS Fall Meeting, 2018, English, International conference
    Poster presentation

  • Resonant Dielectric Nanoparticles as Efficient Nanoantennas in Optical Regime
    Hiroshi Sugimoto, Minoru Fujii
    2018年 第79回応用物理学会秋季術講演会, 2018, English, Domestic conference
    Oral presentation

  • Microstructure of boron and phosphorus co-doped colloidal silicon nanocrystals
    Keita Nomoto, Hiroshi Sugimoto, Xiang Yuan Cui, Anna Ceguerra, Minoru Fujii, Simon Ringer
    19th International Microscopy Congress (IMC19), 2018, English, International conference
    Oral presentation

  • Donor and Acceptor Codoping in Silicon Quantum Dots for Efficient and Tunable Near IR Emission
    Hiroshi Sugimoto, Minoru Fujii
    2018 MRS Spring Meeting & Exhibit, 2018, English, International conference
    Oral presentation

  • Colloidal Silicon Nanoantenna for Low-Loss Dielectric Nanophotonics Platform
    Hiroshi Sugimoto, Minoru Fujii
    2018 MRS Spring Meeting & Exhibit, 2018, English, International conference
    Oral presentation

  • All-Inorganic Water-Dispersible Silicon Quantum Dots
    Minoru Fujii, Hiroshi Sugimoto, Shinya Kano
    233rd ECS Meeting, 2018, English, International conference
    [Invited]
    Invited oral presentation

  • 不純物ドープシリコン量子ドットの単一ドット分光
    Kanno Takashi, Sugimoto Hiroshi, Anna Fucikova, Jan Valenta, Fujii Minoru
    2017年第64回応用物理学会春季学術講演会, Mar. 2017, Japanese, 横浜市, Domestic conference
    Oral presentation

  • 不純物ドーピングによるシリコン量子ドットの輻射再結合レート増大(Ⅰ)
    Yamamura Masataka, Sugimoto Hiroshi, Fujii Minoru
    2017年第64回応用物理学会春季学術講演会, Mar. 2017, Japanese, 横浜市, Domestic conference
    Oral presentation

  • 水分散性シリコン量子ドットベース光触媒材料の開発（Ⅰ）
    Kojima Takuya, Nakamura Toshiyuki, Sugimoto Hiroshi, Fujii Minoru
    2017年第64回応用物理学会春季学術講演会, Mar. 2017, Japanese, 横浜市, Domestic conference
    Oral presentation

  • 金属イオンを用いた凝集制御によるシリコン量子ドット高次元構造の形成
    Ohata Yuki, Sugimoto Hiroshi, Inoue Asuka, Fujii Minoru
    2017年第64回応用物理学会春季学術講演会, Mar. 2017, Japanese, 横浜市, Domestic conference
    Poster presentation

  • Metal Film Over Nanosphere構造におけるシリコン量子ドット単層膜の吸収断面積および発光再結合レートの同時増強
    Inoue Asuka, Sugimoto Hiroshi, Fujii Minoru
    2017年第64回応用物理学会春季学術講演会, Mar. 2017, Japanese, 横浜市, Domestic conference
    Oral presentation

  • Atom Probe Tomographyによる不純物ドープシリコンナノ結晶の構造評価
    Sugimoto Hiroshi, Nomoto Keita, Simon P.Ringer, Gavin Conibeer, Fujii Minoru
    2017年第64回応用物理学会春季学術講演会, Mar. 2017, Japanese, 横浜市, Domestic conference
    Oral presentation

  • 生体の第二光学窓領域に発光を示す水分散性シリコン量子ドット
    SAKIYAMA Makoto, SUGIMOTO Hiroshi, FUJII Minoru
    2017年 第78回応用物理学会秋季学術講演会, 2017, Japanese, Domestic conference
    Oral presentation

  • 金属イオンを用いたシリコン量子ドット高次構造の形成
    OHATA Yuki, SUGIMOTO Hiroshi, FUJII Minoru
    2017年 第78回応用物理学会秋季学術講演会, 2017, Japanese, Domestic conference
    Oral presentation

  • シリコン量子ドットの形状制御による基板上への配列制御
    YAMAMURA Masataka, SUGIMOTO Hiroshi, FUJII Minoru
    2017年 第78回応用物理学会秋季学術講演会, 2017, Japanese, Domestic conference
    Oral presentation

  • コロイド状シリコン球の作製と誘電体ナノアンテナへの応用
    SUGIMOTO Hiroshi, FUJII Minoru
    2017年 第78回応用物理学会秋季学術講演会, 2017, Japanese, Domestic conference
    Oral presentation

  • コロイド状シリコンナノ粒子の広範囲サイズ制御とその光学特性
    SUGIMOTO Hiroshi, FUJII Minoru
    2017年 第78回応用物理学会秋季学術講演会, 2017, Japanese, Domestic conference
    Oral presentation

  • Surface Plasmon Enhanced Photoluminescence from Silicon Quantum Dots Monolayer
    INOUE Asuka, SUGIMOTO Hiroshi, FUJII Minoru
    European Materials Research Society Spring Meeting and Exhibit, 2017, English, International conference
    Oral presentation

  • Size-Dependent Energy Level Structures in Donor and Acceptor Codoped Silicon Quantum Dots
    SUGIMOTO Hiroshi, HORI Yusuke, KANO Shinya, FUJII Minoru
    18th International Conference on Physics of Light-Matter Coupling in Nanostructures, 2017, English, International conference
    Poster presentation

  • Silicon Quantum Dots and their Impact on Different Cell Types
    T. Belinova, L. Vrabcova, A. Fucikova, J. Valenta, Hiroshi Sugimoto, Minoru Fujii, M. H. Kalbacova
    2017 European Materials Research Society Fall Meeting and Exhibit, 2017, English, International conference
    Oral presentation

  • Silicon Nanocrystals in Highly Scattering Media -Broadband Enhancement of Effective Absorption Cross Section
    SUGIMOTO Hiroshi, OZAKI Yusuke, FUJII Minoru
    2017 European Materials Research Society Fall Meeting and Exhibit, 2017, English, International conference
    Oral presentation

  • Metal Nano Particle on Mirror構造におけるシリコン量子ドットの発光制御特性(III)
    YASHIMA Shiho, SUGIMOTO Hiroshi, FUJII Minoru
    2017年 第78回応用物理学会秋季学術講演会, 2017, Japanese, Domestic conference
    Oral presentation

  • Formation of Laminated Films of Silicon Quantum Dot Monolayers from the Colloidal Solution
    FUJII Minoru, SUGIMOTO Hiroshi, FURUTA Kenta
    European Materials Research Society Spring Meeting and Exhibit, 2017, English, International conference
    Oral presentation

  • Colloidal Si Nanospheres with Diameters Raging from 1 to 250 nm –Photoluminescence and Mie Resonances
    SUGIMOTO Hiroshi, FUJII Minoru
    2017 European Materials Research Society Fall Meeting and Exhibit, 2017, English, International conference
    Oral presentation

  • 有機色素脱色によるシリコン量子ドットの光触媒活性の評価
    Kojima Takuya, Sugimoto Hiroshi, Takashina Hiroyuki, Fujii Minoru
    神戸大学研究基盤センター「若手フロンティア研究会2016」, Dec. 2016, Japanese, 神戸市, Domestic conference
    Poster presentation

  • 金属ナノ構造/シリコン量子ドット複合体の発光特性評価
    Inoue Asuka, Sugimoto Hiroshi, Fujii Minoru
    神戸大学研究基盤センター「若手フロンティア研究会2016」, Dec. 2016, Japanese, 神戸市, Domestic conference
    Poster presentation

  • 化学ドーピングによるシリコンナノ結晶コロイドの光学特性制御
    Hori Yusuke, Sugimoto Hiroshi, Fujii Minoru
    神戸大学研究基盤センター「若手フロンティア研究会2016」, Dec. 2016, Japanese, 神戸市, Domestic conference
    Poster presentation

  • MNPoM構造におけるSi量子ドットの発光特性制御
    Yashima Shiho, Sugimoto Hiroshi, Takashina Hiroyuki, Fujii Minoru
    神戸大学研究基盤センター「若手フロンティア研究会2016」, Dec. 2016, Japanese, 神戸市, Domestic conference
    Poster presentation

  • Control of Light Emission from Silicon Quantum Dots Coupled to Plasmonic Nanoantennas
    Sugimoto Hiroshi, Yashima Shiho, Fujii Minoru
    2016 MRS Fall Meeting & Exhibit, Nov. 2016, English, Boston,USA, International conference
    Oral presentation

  • Speccific Binding of Codoped Silicon Nanocrystal on Self-Assembled Monolayer
    Kano Shinya, Kanno Takashi, Tada Yasuhiro, Higashikawa Yasuhiro, Sugimoto Hiroshi, Fujii Minoru
    International Conference on Self-Assembly in Confined Spaces, Oct. 2016, English, San Sebastian,Spain, International conference
    Poster presentation

  • 化学ドーピングによるシリコンナノ結晶コロイドの光学特性制御
    Hori Yusuke, Sugimoto Hiroshi, Fujii Minoru
    第77回応用物理学会秋季学術講演会, Sep. 2016, Japanese, 新潟市, Domestic conference
    Oral presentation

  • シランカップリング反応によるシリコン量子ドットの表面修飾
    Inoue Asuka, Sugimoto Hiroshi, Fujii Minoru
    第77回応用物理学会秋季学術講演会, Sep. 2016, Japanese, 新潟市, Domestic conference
    Oral presentation

  • Film - coupled nanoparticle 構造におけるシリコンナノ結晶の発光特性(Ⅱ)
    Yashima Shiho, Sugimoto Hiroshi, Takashina Hiroyuki, Fujii Minoru
    第77回応用物理学会秋季学術講演会, Sep. 2016, Japanese, 新潟市, Domestic conference
    Oral presentation

  • Synthesis of silicon-noble metal hybrid nanoparticle
    Sugimoto Hiroshi, Imakita Kenji, Fujii Minoru
    European Materials Research Society, 2016 Spring Meeting, May 2016, English, Lille,France, International conference
    Public symposium

  • Size-dependence of HOMO, LUMO and Fermi levels of B and P codoped Si nanocrystals
    Fujii Minoru, Hori Yusuke, Kano Shinya, Sugimoto Hiroshi, Imakita Kenji
    European Materials Research Society, 2016 Spring Meeting, May 2016, English, Lille,France, International conference
    Public symposium

  • Organic Functionalization of near-infrared luminescent silicon nanocrystals
    Kanno Takashi, Kano Shinya, Sugimoto Hiroshi, Tada Yasuhiro, Imakita Kenji, Fujii Minoru
    European Materials Research Society, 2016 Spring Meeting, May 2016, English, Lille,France, International conference
    Public symposium

  • Application of fluorescent co-doped silicon nanocrystals in cell biology
    Lucie Ostrovsk, Kanno Takashi, Sugimoto Hiroshi, Antonin Broz, Jan Valenta, Anna Fucikova, Fujii Minoru, Marie Hubalek Kalbacova
    European Materials Research Society, 2016 Spring Meeting, May 2016, English, Lille,France, International conference
    Public symposium

  • Surface Plasmon Enhanced Absorption Cross-Section of Silicon Quantum Dots in Gold Nanoparticle Composites
    Inoue Asuka, Sugimoto Hiroshi, Imakita Kenji, Fujii Minoru
    2016 MRS Spring Meeting & Exhibit, Apr. 2016, English, Phoenix,USA, International conference
    Poster presentation

  • Silicon nanocrystal-based metal-semiconductor hybrid nanoparticles
    Sugimoto Hiroshi, Ren Wang, Luca Dal Negro, Bjorn M.Reinhard, Fujii Minoru
    2016 MRS Spring Meeting & Exhibit, Apr. 2016, English, Phoenix,USA, International conference
    Public symposium

  • Confinement of Donors and Doping Efficiency in Embedded and Freestanding Silicon Nanocrystals
    Antonio J.Almeida, Sugimoto Hiroshi, Fujii Minoru, Martin S.Brandt, Martin Stutzmann, Rui N.Pereira
    2016 MRS Spring Meeting & Exhibit, Apr. 2016, English, Phoenix,USA, International conference
    Public symposium

■ Affiliated Academic Society
  • 光化学協会
    Jul. 2020 - Present

  • 応用物理学会
    Mar. 2012 - Present

■ Research Themes
  • 誘電体ナノアンテナの増強キラル近接場による不斉光反応場の創成
    科学技術振興機構(JST), 創発的研究支援事業 フェーズ１, 神戸大学, Apr. 2023 - Mar. 2026, Principal investigator

  • ケイ素ナノ粒子を用いた構造色カラーインク
    新エネルギー・産業技術総合開発機構(NEDO), 官民による若手研究者発掘支援事業, マッチングサポートフェーズ, Sep. 2025

  • トロイダル双極子共鳴のデバイス応用に向けたメタサーフェスプラットホームの構築
    藤井 稔, 杉本 泰
    日本学術振興会, 科学研究費助成事業 基盤研究(B), 基盤研究(B), 神戸大学, 01 Apr. 2021 - 31 Mar. 2025
    シリコン薄膜上にアスペクト比が小さいシリコンナノディスクのHexagonal arrayを配列した構造について、シミュレーションにより光学特性の解析を行った．その結果，消光係数が非常に小さい領域においてトロイダル双極子共鳴（アナポール状態）による非常に狭帯域な吸収が発現することを見出した．また，共鳴波長において入射電場がナノディスクの下のシリコン薄膜の領域に強く閉じ込められることを明らかにした．さらに，シリコン薄膜の厚さにより共鳴波長を非常に広範囲に制御可能である事を示した．構造パラメーターと共鳴モードの関係を明らかにすることにより，目的の波長で高い吸収増強度と高Q値を同時に実現する構造の探索を行いそのガイドラインを得た．次に，シミュレーションにより決定したナノディスクアレー構造を大面積に形成する技術の開発を行った．シリカ基板上にスパッタリング法によりシリコン薄膜を形成した後，その上に形成したポリスチレン球のhexagonal arrayをマスクとしてシリコン薄膜をエッチングした．エッチング時間を制御することにより，シリコン薄膜上にシリコンナノディスクアレーを配列したmonolithic型構造を実現した．作製した構造の透過スペクトルと反射スペクトルから吸収スペクトルを得，シミュレーション結果との比較を行った．その結果，目的とする構造が得られていることが明らかになった．作製したデバイスの光電流スペクトルを測定したところ，シリコンのバンドギャップよりも長波長の領域においてアナポール状態による狭帯域な光電流ピークが観測された．

  • シリコンナノ粒子のＭｉｅ共鳴を用いたマルチカラーイムノクロマトセンサ
    科学技術振興機構(JST), 大学発新産業創出基金事業, 可能性検証, Oct. 2023 - Sep. 2024

  • Development of biophotonics and photochemical applications of silicon quantum dots in collaboration with a consortium established for the formation of "Silicon Nanomaterials Center" founded by US NSF
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Fund for the Promotion of Joint International Research (Fostering Joint International Research (B)), Fund for the Promotion of Joint International Research (Fostering Joint International Research (B)), Kobe University, 09 Oct. 2018 - 31 Mar. 2024

  • 完全吸収シリコンメタサーフェスを利用した電流検出型バイオセンサの開発
    村田学術振興財団, 研究助成, Jul. 2023, Principal investigator

  • Mie共鳴により発色するナノ粒子インク色材の創製と応用開発
    杉本 泰
    日本学術振興会, 科学研究費助成事業 若手研究, 若手研究, 神戸大学, 01 Apr. 2021 - 31 Mar. 2023
    本研究では、高屈折率誘電体ナノ粒子のMie共鳴を用いたインク色材の開発を目標としている。「塗る」ことで鮮やかに発色可能なインク色材開発に向けた材料・設計手法などの基盤技術を確立し、外部から能動的な色彩制御を目指す。本年度は、以下の研究を実施した。 (i) 可視域でMie共鳴を示すシリコンナノ粒子の散乱特性制御、分散安定性、および光安定性の向上を目的として、Stober法によりシリカシェルを形成する技術を開発した。10-30 nmで精密に膜厚を制御してコーティングする技術を開発した。これにより、水やアルコール中での長期間安定性と、発色の光安定性の向上が期待できる。さらに、Metal-assisted etching法を応用し、シリコンナノ粒子にナノ細孔を形成することで、実効的な屈折率の制御と、それによる散乱スぺクトル変化を理論・実験の両面から明らかにし、散乱スペクトル制御の新しい方法を提案した。 (ii) シリコンナノ粒子の多量体構造は粒子間での電場・磁場増強や散乱指向性、導波モードの形成など興味深い特性を示す。そのため、多量体化により色相制御範囲を拡大できる可能性がある。従来のトップダウンプロセスではなく、ボトムアッププロセスで溶液に分散したシリコンナノ粒子をナノパターン上に集積し、多量体を形成する技術を開発した。ナノパターン上に移流集積法を用いてナノ粒子を配置し、形成された多量体構造の光学特性をFDTDシミュレーションと顕微分光測定により調査し、粒子間の相互作用が光学特性に与える影響を明らかにした。 以上に加えて、コロイドシリコンナノ粒子の形成方法と光学特性、応用機能について総括したReview Paperを発表した。

  • Photochemical reaction platform enabled by Mie resonances
    Japan Science and Technology Agency, JST-PRESTO, Kobe Univesity, Oct. 2019 - Mar. 2023, Principal investigator

  • Carrier control and matrix engineering of silicon quantum dot thin film
    Fujii Minoru
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Challenging Research (Exploratory), Kobe University, 28 Jun. 2019 - 31 Mar. 2022
    The ultimate goal of this research is to realize high-performance optoelectronic devices from silicon quantum dots by a coating or printing process of the colloidal solution. To achieve this, we have been working on the chemical doping by molecule adsorption, the formation of a composite structure with two-dimensional transition metal dichalcogenides, the improvement of conductivity between quantum dots by adding platinum nanoparticles or graphene nanoparticles to the thin film, and the development of a composite film composed of silicon quantum dots and lead halide perovskite. Through these researches, we obtained guidelines for improving the property of silicon quantum dot thin films, and showed for the first time that a thin film produced by coating silicon quantum dots works as a photoelectrode for hydrogen generation.

  • Development of high-contrast bio imaging platform using nano crystalline silicon quantum dots
    Japan Society for the Promotion of Science, Bilateral Programs, Kobe University, Apr. 2020 - Mar. 2022, Principal investigator

  • Hybrid Doping in Quantum Dot-Based Functional Nanomaterials
    SUGIMOTO Hiroshi
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Early-Career Scientists, Grant-in-Aid for Early-Career Scientists, Kobe University, 01 Apr. 2018 - 31 Mar. 2021
    This project aims at the further exploration of the optical functionality of semiconductor quantum dots by developing a hybrid approach of substitutional doping and chemical doping. By performing detail structural and optical studies on boron and phosphorus codoped silicon quantum dots developed by our group, the effect of substitutional doping on the excess carriers inside quantum dots and energy level structure are investigated. In addition, the chemical doping is successfully demonstrated using molecular reductant and the photocatalytic reaction that cannot be achieved by solely substitutional doping, is demonstrated.

  • 可視光による水の光分解反応を指向したボロンフォスファイドナノ結晶の開発
    関西エネルギー・リサイクル科学研究振興財団, 試験研究助成, 神戸大学, Apr. 2019 - Mar. 2020, Principal investigator

  • Mie共鳴により発色する新規顔料ナノ粒子インクの創製
    公益財団法人ホソカワ粉体工学振興財団, 研究助成金, 神戸大学, Apr. 2019 - Mar. 2020, Principal investigator

  • ナノ界面制御による機能性量子ドット-２次元層状物質複合材料の創製
    公益財団法人 ひょうご科学技術協会, 学術研究助成事業, 神戸大学, Apr. 2018 - Mar. 2019, Principal investigator

  • コロイド状シリコン粒子を用いた光メタ表面デバイスの開発
    カシオ科学振興財団, 研究助成, 神戸大学, Apr. 2018 - Mar. 2019, Principal investigator

  • 可視応答型シリコン微小球の作製と表面増強蛍光への応用
    公益財団法人 泉科学技術振興財団, 研究助成, 神戸大学, Oct. 2017 - Sep. 2018, Principal investigator

  • ｎ型、ｐ型不純物同時ドープコロイド状シリコンナノ結晶の開発と基礎物性解明
    杉本 泰
    日本学術振興会, 科学研究費助成事業 特別研究員奨励費, 特別研究員奨励費, 神戸大学, 25 Apr. 2014 - 31 Mar. 2017
    本年度は、シリコンナノ結晶コロイドの基礎物性解明及び大面積電子デバイス・バイオフォトニクス応用を念頭に研究を行った。不純物ドープシリコンナノ結晶の基礎物性解明の一環として、(i) ３次元アトムプローブトモグラフィー法による原子スケールでの不純物分布の解明、(ii) 単一シリコンナノ結晶の発光特性解明に関する研究を行った。さらに、バイオ応用を見据えて、(iii) 生体分子を用いたシリコンナノ結晶-プラズモニックナノ粒子複合体形成、(iv) シリコンナノ結晶を用いたバイオイメージング応用実証に関する研究を行った。 (i) に関して、ニューサウスウェールズ大学・シドニー大学と共同で３次元アトムプローブによるシリコンナノ結晶内部の不純物分布を明らかにし、その粒径依存性や不純物の偏析状態を評価した。(ii) について、顕微分光法を用いて単一の不純物ドープシリコンナノ結晶の発光特性を評価した。これらの研究により、不純物ドープシリコンナノ結晶の構造及び発光起源が不純物をドープしていないナノ結晶と大きく異なることを明らかにした。 (iii) に関して、シリコンナノ結晶表面をアミノ基、チオール基で修飾し、DNAはハイブリダイゼーションにより金ナノ粒子と結合した。複合体は3-4倍の発光強度を示した。(iv)に関して、シリコンナノ結晶と骨芽細胞を24-48時間培養し、その毒性評価・発光特性評価を行った。シリコンナノ結晶は非常に毒性が低く、細胞内で長時間安定して近赤外発光を示すことを明らかにした。

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