Researcher Profile and Settings

Affiliation

• ＜Faculty / Graduate School / Others＞

  Graduate School of Engineering / Department of Electrical and Electronic Engineering

• ＜Related Faculty / Graduate School / Others＞

  Faculty of Engineering / Department of Electrical and Electronic Engineering

Teaching

• Faculty of Engineering / Department of Electrical and Electronic Engineering, 2022, Electrical and Electronics Engineering Laboratory ⅡA

  Link to Kobe Univ. syllabus
• Faculty of Engineering / Department of Electrical and Electronic Engineering, 2022, Electrical and Electronics Engineering Laboratory ⅡA

  Link to Kobe Univ. syllabus
• Faculty of Engineering / Department of Electrical and Electronic Engineering, 2022, Electrical and Electronics Engineering Laboratory ⅡB

  Link to Kobe Univ. syllabus
• Faculty of Engineering / Department of Electrical and Electronic Engineering, 2022, Electrical and Electronics Engineering Laboratory ⅡB

  Link to Kobe Univ. syllabus

Research Activities

Research Interests

• 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 Memberships

• Apr. 2021 - Present, 応用物理学会関西支部, 幹事

Awards

• 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

Published Papers

• Fluorophore‐Decorated Mie Resonant Silicon Nanosphere for Scattering/Fluorescence Dual‐Mode Imaging

  Masato Adachi, Hiroshi Sugimoto, Yuya Nishimura, Kenta Morita, Chiaki Ogino, Minoru Fujii

  Wiley, 24 Jan. 2023, Small, 2207318 - 2207318

  Scientific journal

• Interfacial Charge Transfer Induced Enhanced Near-Infrared Photoluminescence and Enhanced Visible Photodetection in Two-Dimensional/Zero-Dimensional Bi2Se3/CsPbBr2I Heterojunctions with Type-I Band Alignment

  Sumana Paul, Joydip Ghosh, Md Tarik Hossain, Hiroaki Hasebe, Hiroshi Sugimoto, Minoru Fujii, Pravat K. Giri

  06 Oct. 2022, The Journal of Physical Chemistry C

  [Refereed]

  Scientific journal

• Size-Dependent Mutual Charge Transfer between B- and P-Codoped Si Quantum Dots and Monolayer MoS₂

  Hiroshi Sugimoto

  American Chemical Society ({ACS}), 29 Sep. 2022, The Journal of Physical Chemistry C, 126 (38), 16401 - 16408, English

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)
• Toroidal Dipole-Induced Photocurrent Enhancement in Si Nanodisk Hexagonal Array below the Band Gap

  Hiroshi Sugimoto

  American Chemical Society ({ACS}), 28 Sep. 2022, ACS Photonics, English

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)
• Mode Hybridization in Silicon Core–Gold Shell Nanosphere

  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, 26 Sep. 2022, Small, 18 (45), 2204890 - 2204890, English

  Scientific journal

• Computational Discovery and Experimental Demonstration of Boron Phosphide Ultraviolet Nanoresonators

  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), 2200422 - 2200422, English

  Scientific journal

• (Invited, Digital Presentation) Enhancement of Magnetic Dipole Transition of Molecules By Silicon Nanoparticle Nanoantenna

  Minoru Fujii, Hiroshi Sugimoto

  07 Jul. 2022, ECS Meeting Abstracts

  [Invited]

  Scientific journal

• Enhanced Light Emission from Monolayer MoS₂ by Doubly Resonant Spherical Si Nanoantennas

  Hiroshi Sugimoto

  American Chemical Society ({ACS}), 18 May 2022, ACS Photonics, 9 (5), 1741 - 1747, English

  Scientific journal

• Resonance Couplings in Si@MoS ₂ Core–Shell Architectures

  Hiroshi Sugimoto

  Wiley, Apr. 2022, Small, 18 (17), 2200413 - 2200413, English

  Scientific journal

• Disentangling Cathodoluminescence Spectra in Nanophotonics: Particle Eigenmodes vs Transition Radiation

  Saskia Fiedler, P. Elli Stamatopoulou, Artyom Assadillayev, Christian Wolff, Hiroshi Sugimoto, Minoru Fujii, N. Asger Mortensen, Søren Raza, Christos Tserkezis

  American Chemical Society ({ACS}), 23 Mar. 2022, Nano Letters, 22 (6), 2320 - 2327

  [Refereed]

  Scientific journal

• Silicon Nanosphere with Accessible Magnetic Hotspot

  Akira Matsumori, Hiroshi Sugimoto, Minoru Fujii

  Wiley, 27 Feb. 2022, Advanced Optical Materials, 2102574 - 2102574, English

  Scientific journal

• Template‐Assisted Self‐Assembly of Colloidal Silicon Nanoparticles for All‐Dielectric Nanoantenna

  Hidemasa Negoro, Hiroshi Sugimoto, Tatsuki Hinamoto, Minoru Fujii

  22 Feb. 2022, Advanced Optical Materials

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)
• Solution-processed silicon quantum dot photocathode for hydrogen evolution

  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, 26 Nov. 2021, Nanotechnology, 32 (48), 485709 - 485709, English, International magazine

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)
• Colloidal Mie resonant silicon nanoparticles

  Hiroshi Sugimoto, Minoru Fujii

  {IOP} Publishing, 05 Nov. 2021, Nanotechnology, 32 (45), 452001 - 452001

  Scientific journal

• Structure and Properties of Heavily B and P Codoped Amorphous Silicon Quantum Dots

  R. Turansk{\'{y } }, J. Brndiar, A. Pershin, {\'{A } }. Gali, H. Sugimoto, M. Fujii, I. {\v{S } }tich

  American Chemical Society ({ACS}), 15 Oct. 2021, The Journal of Physical Chemistry C, English

  Scientific journal

• Direct Excitation of Triplet State of Molecule by Enhanced Magnetic Field of Dielectric Metasurfaces

  Hiroshi Sugimoto, Hiroaki Hasebe, Taniyuki Furuyama, Minoru Fujii

  Wiley, 13 Oct. 2021, Small, 17 (47), 2104458 - 2104458, English

  Scientific journal

• Thermal near-field tuning of silicon Mie nanoparticles

  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}, 01 Oct. 2021, Nanophotonics, English

  Scientific journal

• Colloidal solution of boron and phosphorus codoped silicon quantum dots -from material development to applications

  Minoru FUJII, Hiroshi Sugimoto, Shinya Kano

  {IOP} Publishing, 10 Aug. 2021, Japanese Journal of Applied Physics

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)
• Plasmon Launching and Scattering by Silicon Nanoparticles

  Artyom Assadillayev, Tatsuki Hinamoto, Minoru Fujii, Hiroshi Sugimoto, Mark L. Brongersma, S{\o}ren Raza

  American Chemical Society ({ACS}), 16 Jun. 2021, ACS Photonics, 8 (6), 1582 - 1591, English

  Scientific journal

• Magnetic Purcell Enhancement by Magnetic Quadrupole Resonance of Dielectric Nanosphere Antenna

  Hiroshi Sugimoto, Minoru Fujii

  American Chemical Society ({ACS}), 16 Jun. 2021, ACS Photonics, 8 (6), 1794 - 1800, English

  Scientific journal

• Colloidal Mie Resonators for All‐Dielectric Metaoptics

  Hiroshi Sugimoto, Minoru Fujii

  Wiley, 15 Feb. 2021, Advanced Photonics Research, 2 (4), 2000111 - 2000111

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)
• Angle‐, Polarization‐, and Wavelength‐Resolved Light Scattering of Single Mie Resonators Using Fourier‐Plane Spectroscopy

  Tatsuki Hinamoto, Mikihiko Hamada, Hiroshi Sugimoto, Minoru Fujii

  Wiley, 15 Feb. 2021, Advanced Optical Materials, 9 (8), 2002192 - 2002192

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)
• Dual modulating luminescence in all-inorganic perovskite CsPbBr3 quantum dots

  Ge, W., Shi, J., Xu, M., Wu, Y., Sugimoto, H., Fujii, M.

  2021, Optical Materials, 113

  Scientific journal

• Color Toning of Mie Resonant Silicon Nanoparticle Color Inks

  Okazaki, Takuma, Sugimoto, Hiroshi, Hinamoto, Tatsuki, Fujii, Minoru

  2021, ACS Applied Materials & Interfaces, 13 (11)

  Scientific journal

• Optimizing plasmon enhanced luminescence in silicon nanocrystals by gold nanorods

  Pavelka, Ondřej, Dyakov, Sergey, Veselý, Jozef, Fučíková, Anna, Sugimoto, Hiroshi, Fujii, Minoru, Valenta, Jan

  The Royal Society of Chemistry, 2021, Nanoscale, 13

  Scientific journal

• Stable near-infrared photoluminescence from silicon quantum dot–bovine serum albumin composites

  Asuka Inoue, Hiroshi Sugimoto, Yozo Sugimoto, Kensuke Akamatsu, Marie Hubalek Kalbacova, Chiaki Ogino, Minoru Fujii

  Cambridge University Press ({CUP}), 11 Dec. 2020, MRS Communications, 10 (4), 680 - 686

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)
• Visible-light driven photocatalytic hydrogen generation by water-soluble all-inorganic core-shell silicon quantum dots

  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), 15789 - 15794, English

  [Refereed]

  Scientific journal

• Silicon Quantum Dot Supraparticles for Fluorescence Bioimaging

  Minoru Fujii, Riku Fujii, Miho Takada, Hiroshi Sugimoto

  American Chemical Society ({ACS}), 26 Jun. 2020, ACS Applied Nano Materials, 3 (6), 6099 - 6107

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)
• Triplex Glass Laminates with Silicon Quantum Dots for Luminescent Solar Concentrators

  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

• Mie Resonator Color Inks of Monodispersed and Perfectly Spherical Crystalline Silicon Nanoparticles

  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), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)
• (Invited) Photoelectrochemical Properties of All-Inorganic Core/Shell Silicon Quantum Dots

  Minoru Fujii, Hiroshi Sugimoto

  The Electrochemical Society, 01 May 2020, ECS Meeting Abstracts, {MA}2020-01 (16), 1061 - 1061

  [Refereed]

  Scientific journal

• Precise size separation of water-soluble red-to-near-infrared-luminescent silicon quantum dots by gel electrophoresis

  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), 9266 - 9271, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)
• 3D microstructure analysis of silicon-boron phosphide mixed nanocrystals

  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), 7256 - 7262, English

  [Refereed]

  Scientific journal

• Excitation of Nonradiating Anapoles in Dielectric Nanospheres

  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), English

  [Refereed]

  Scientific journal

• Quantitative Understanding of Charge-Transfer-Mediated Fe3+ Sensing and Fast Photoresponse by N-Doped Graphene Quantum Dots Decorated on Plasmonic Au Nanoparticles

  Hiroshi Sugimoto

  29 Jan. 2020, ACS Applied Materials & Interfaces, English

  [Refereed]

  Scientific journal

• Coupled Toroidal Dipole Modes in Silicon Nanodisk Metasurface: Polarization Independent Narrow Band Absorption and Directional Emission

  Hasebe, Hiroaki, Sugimoto, Hiroshi, Hinamoto, Tatsuki, Fujii, Minoru

  2020, Advanced Optical Materials, 8 (22), 2001148 - 2001148

  Scientific journal

• Colloidal Solutions of Silicon Nanospheres toward All-Dielectric Optical Metafluids

  Hinamoto, Tatsuki, Hotta, Shinnosuke, Sugimoto, Hiroshi, Fujii, Minoru

  2020, Nano Letters, 20 (10)

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)
• Selective excitation and enhancement of multipolar resonances in dielectric nanospheres using cylindrical vector beams

  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), English

  [Refereed]

  Scientific journal

• Silicon Nanowire on Mirror Nanoantennas: Engineering Hybrid Gap Mode for Light Sources and Sensing Platforms

  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), 7223 - 7230, English

  [Refereed]

  Scientific journal

• Gold nanopillar array with sharp surface plasmon resonances and the application in immunoassay

  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, 14 Dec. 2019, Journal of Applied Physics, 126 (22), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)
• Absolute Scattering Cross Sections of Titanium Nitride Nanoparticles Determined by Single-Particle Spectroscopy: Implications for Plasmonic Nanoantennas

  Hiroshi Sugimoto

  25 Oct. 2019, ACS Applied Nano Materials, English

  [Refereed]

  Scientific journal

• Elongated Metal Nanocap with Two Magnetic Dipole Resonances and Its Application for Upconversion Enhancement

  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.

  24 Oct. 2019, Journal of Physical Chemistry C, 123 (42), 25809 - 25815, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)
• Evidence for plasmonic hot electron injection induced superior visible light photocatalysis by g-C3N4 nanosheets decorated with Ag–TiO2(B) and Au–TiO2(B) nanorods

  Hiroshi Sugimoto

  Oct. 2019, Solar Energy Materials and Solar Cells, English

  [Refereed]

  Scientific journal

• Forward to Backward Scattering Ratio of Dielectric–Metal Heterodimer Suspended in Almost Free‐Space

  Hiroshi Sugimoto

  Oct. 2019, Advanced Optical Materials, English

  [Refereed]

  Scientific journal

• Distribution of boron and phosphorus and roles of co-doping in colloidal silicon nanocrystals

  Hiroshi Sugimoto

  Oct. 2019, Acta Materialia, English

  [Refereed]

  Scientific journal

• Size-dependent photocatalytic activity of cubic boron phosphide nanocrystals in the quantum confinement regime

  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.

  19 Sep. 2019, Journal of Physical Chemistry C, 123 (37), 23226 - 23235, English

  [Refereed]

  Scientific journal

• Antibody-conjugated near-infrared luminescent silicon quantum dots for biosensing

  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, 01 Sep. 2019, MRS Communications, 9 (3), 1079 - 1086, English

  [Refereed]

  Scientific journal

• Antibody-conjugated near-infrared luminescent silicon quantum dots for biosensing

  Hiroshi Sugimoto

  Abstract

  Sep. 2019, MRS Communications, English

  [Refereed]

  Scientific journal

• Charge Transfer-Induced Photobrightening of Silicon Quantum Dots in Water Containing a Molecular Reductant

  Kosuke Inoue, Takuya Kojima, Hiroshi Sugimoto, Minoru Fujii

  17 Jan. 2019, The Journal of Physical Chemistry C, 123 (2), 1512 - 1518, English

  [Refereed]

  Scientific journal

• Silver nanoparticles stabilized with a silicon nanocrystal shell and their antimicrobial activity

  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), 15171 - 15176, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)
• Donor-Acceptor Pair Recombination in Size-Purified Silicon Quantum Dots

  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}), 14 Nov. 2018, Nano Letters, 18 (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

• Silicon quantum dots with heavily boron and phosphorus codoped shell

  Fujii, Minoru, Sugimoto, Hiroshi, Kano, Shinya

  2018, Chemical Communications, 54 (35)

  [Refereed]

  Scientific journal

• Size-Dependent Photocatalytic Activity of Colloidal Silicon Quantum Dot

  Kojima, Takuya, Sugimoto, Hiroshi, Fujii, Minoru

  2018, Journal of Physical Chemistry C, 122 (3), English

  [Refereed]

  Scientific journal

• Visualizing a core-shell structure of heavily doped silicon quantum dots by electron microscopy using an atomically thin support film

  Sugimoto, Hiroshi, Yamamura, Masataka, Sakiyama, Makoto, Fujii, Minoru

  2018, Nanoscale, 10 (16), English

  [Refereed]

  Scientific journal

• Broadband Dielectric-Metal Hybrid Nanoantenna: Silicon Nanoparticle on a Mirror

  Sugimoto, Hiroshi, Fujii, Minoru

  2018, Acs Photonics, 5 (5), English

  [Refereed]

  Scientific journal

• Assembling silicon quantum dots into wires, networks and rods via metal ion bridges

  Ohata, Yuki, Sugimoto, Hiroshi, Fujii, Minoru

  2018, Nanoscale, 10 (16), English

  [Refereed]

  Scientific journal

• Silicon Quantum Dots and Their Impact on Different Human Cells

  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), 1 - 5, English

  [Refereed]

  Scientific journal

• Long-lived luminescence of colloidal silicon quantum dots for time-gated fluorescence imaging in the second near infrared window in biological tissue

  Sakiyama, Makoto, Sugimoto, Hiroshi, Fujii, Minoru

  2018, Nanoscale, 10 (29), 13902 - 139007, English

  [Refereed]

  Scientific journal

• Hybridized Plasmonic Gap Mode of Gold Nanorod on Mirror Nanoantenna for Spectrally Tailored Fluorescence Enhancement

  Sugimoto, Hiroshi, Yashima, Shiho, Fujii, Minoru

  2018, Acs Photonics, 5 (8), 3421 - 3427, English

  [Refereed]

  Scientific journal

• Metal-Core/Dielectric-Shell/Metal-Cap Composite Nanoparticle for Upconversion Enhancement

  Hinamoto, Tatsuki, Sugimoto, Hiroshi, Fujii, Minoru

  2018, Journal of Physical Chemistry C, 122 (30), 17465 - 17472, English

  [Refereed]

  Scientific journal

• Growth of Core-Shell Silicon Quantum Dots in Borophosphosilicate Glass Matrix: Raman and Transmission Electron Microscopic Studies

  Minami, Akiko, Sugimoto, Hiroshi, Crowe, Iain F., Fujii, Minoru

  2018, Journal of Physical Chemistry C, 122 (36), 21069 - 21075, English

  [Refereed]

  Scientific journal

• Donor-Acceptor Pair Recombination in Size-Purified Silicon Quantum Dots

  Sugimoto, Hiroshi, Yamamura, Masataka, Fujii, Riku, Fujii, Minoru

  2018, Nano Letters, 18 (11), 7282 - 7288, English

  [Refereed]

  Scientific journal

• Critical Size for Carrier Delocalization in Doped Silicon Nanocrystals: A Study by Ultrafast Spectroscopy

  Limpens, Rens, Sugimoto, Hiroshi, Neale, Nathan R., Fujii, Minoru

  2018, Acs Photonics, 5 (10), 4037 - 4045, English

  [Refereed]

  Scientific journal

• New insights into the red luminescent bovine serum albumin conjugated gold nanospecies

  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

• Technology and characterization of MIS structures with co-doped silicon nanocrystals (Si-NCs) embedded in hafnium oxide (HfOx) ultra-thin layers

  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

• Size-dependent donor and acceptor states in codoped Si nanocrystals studied by scanning tunneling spectroscopy

  Ashkenazi, Or, Azulay, Doron, Balberg, Isaac, Kano, Shinya, Sugimoto, Hiroshi, Fujii, Minoru, Millo, Oded

  2017, Nanoscale, 9 (45), English

  [Refereed]

  Scientific journal

• Silicon Quantum Dots in Dielectric Scattering Media: Broadband Enhancement of Effective Absorption Cross Section by Light Trapping

  Sugimoto, Hiroshi, Ozaki, Yusuke, Fujii, Minoru

  2017, Acs Applied Materials & Interfaces, 9 (22), English

  [Refereed]

  Scientific journal

• Photoluminescence enhancement of silicon quantum dot monolayer by plasmonic substrate fabricated by nano-imprint lithography

  Yanagawa, Hiroto, Inoue, Asuka, Sugimoto, Hiroshi, Shioi, Masahiko, Fujii, Minoru

  2017, Journal of Applied Physics, 122 (22), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)
• Photoluminescence Enhancement of Silicon Quantum Dot Monolayer by Double Resonance Plasmonic Substrate

  Inoue, Asuka, Sugimoto, Hiroshi, Fujii, Minoru

  2017, Journal of Physical Chemistry C, 121 (21), English

  [Refereed]

  Scientific journal

• Colloidal Dispersion of Subquarter Micrometer Silicon Spheres for Low-Loss Antenna in Visible Regime

  Sugimoto, Hiroshi, Fujii, Minoru

  2017, Advanced Optical Materials, 5 (17), English

  [Refereed]

  Scientific journal

• Charge-Transfer-Induced Photoluminescence Enhancement in Colloidal Silicon Quantum Dots

  Sugimoto, Hiroshi, Hori, Yusuke, Imura, Yusuke, Fujii, Minoru

  2017, Journal of Physical Chemistry C, 121 (21), English

  [Refereed]

  Scientific journal

• Controlling Surface Plasmon Resonance of Metal Nanocap for Upconversion Enhancement

  Hinamoto, Tatsuki, Takashina, Hiroyuki, Sugimoto, Hiroshi, Fujii, Minoru

  2017, Journal of Physical Chemistry C, 121 (14), 8077 - 8083, English

  [Refereed]

  Scientific journal

• Surface Plasmon Enhanced Emission Rate in Silicon Quantum Dot-Decorated Gold Nanorods in Solution

  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)
• Surface Structure and Current Transport Property of Boron and Phosphorus Co-Doped Silicon Nanocrystals

  Sasaki, Masato, Kano, Shinya, Sugimoto, Hiroshi, Imakita, Kenji, Fujii, Minoru

  2016, Journal of Physical Chemistry C, 120 (1)

  [Refereed]

  Scientific journal

• Size-Dependence of Acceptor and Donor Levels of Boron and Phosphorus Codoped Colloidal Silicon Nanocrystals

  Hori, Yusuke, Kano, Shinya, Sugimoto, Hiroshi, Imakita, Kenji, Fujii, Minoru

  2016, Nano Letters, 16 (4)

  [Refereed]

  Scientific journal

• Doping efficiency and confinement of donors in embedded and free standing Si nanocrystals

  Almeida, A. J., Sugimoto, H., Fujii, M., Brandt, M. S., Stutzmann, M., Pereira, R. N.

  2016, Physical Review B, 93 (11)

  [Refereed]

  Scientific journal

• Atom probe tomography of phosphorus- and boron-doped silicon nanocrystals with various compositions of silicon rich oxide (vol 6, pg 287, 2016)

  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), 469 - 469

  [Refereed]

  Scientific journal

• Silicon nanocrystal-noble metal hybrid nanoparticles

  Sugimoto, H., Fujii, M., Imakita, K.

  2016, Nanoscale, 8 (21), 10956 - 10962, English

  [Refereed]

  Scientific journal

• All-inorganic colloidal silicon nanocrystals-surface modification by boron and phosphorus co-doping

  Fujii, Minoru, Sugimoto, Hiroshi, Imakita, Kenji

  2016, Nanotechnology, 27 (26), English

  [Refereed]

  Scientific journal

• The impact of doped silicon quantum dots on human osteoblasts

  Ostrovska, Lucie, Broz, Antonin, Fucikova, Anna, Belinova, Tereza, Sugimoto, Hiroshi, Kanno, Takashi, Fujii, Minoru, Valenta, Jan, Kalbacova, Marie Hubalek

  2016, Rsc Advances, 6 (68), 63403 - 63413, English

  [Refereed]

  Scientific journal

• Probing Purcell enhancement in plasmonic nanoantennas by broadband luminescent Si quantum dots

  Sugimoto, Hiroshi, Yashima, Shiho, Furuta, Kenta, Inoue, Asuka, Fujii, Minoru

  2016, Applied Physics Letters, 108 (24), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)
• DNA assembly of silicon quantum dots/gold nanoparticle nanocomposites

  Inoue, Asuka, Sugimoto, Hiroshi, Yaku, Hidenobu, Fujii, Minoru

  2016, Rsc Advances, 6 (68), 63933 - 63939, English

  [Refereed]

  Scientific journal

• Atom Probe Tomography Analysis of Boron and/or Phosphorus Distribution in Doped Silicon Nanocrystals

  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), English

  [Refereed]

  Scientific journal

• Atom probe tomography of phosphorus- and boron-doped silicon nanocrystals with various compositions of silicon rich oxide

  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), English

  [Refereed]

  Scientific journal

• Water-dispersible near-infrared luminescent silicon nanocrystals -immobilization on substrate

  Kanno, Takashi, Kano, Shinya, Sugimoto, Hiroshi, Tada, Yasuhiro, Fujii, Minoru

  2016, Mrs Communications, 6 (4), English

  [Refereed]

  Scientific journal

• Single-dot spectroscopy of boron and phosphorus codoped silicon quantum dots

  Kanno, Takashi, Sugimoto, Hiroshi, Fucikova, Anna, Valenta, Jan, Fujii, Minoru

  2016, Journal of Applied Physics, 120 (16), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)
• Controlling Energy Transfer in Silicon Quantum Dot Assemblies Made from All-Inorganic Colloidal Silicon Quantum Dots

  Sugimoto, Hiroshi, Furuta, Kenta, Fujii, Minoru

  2016, Journal of Physical Chemistry C, 120 (42), 24469 - 24475, English

  [Refereed]

  Scientific journal

• Fluorescence Enhancement and Spectral Shaping of Silicon Quantum Dot Monolayer by Plasmonic Gap Resonances

  Yashima, Shiho, Sugimoto, Hiroshi, Takashina, Hiroyuki, Fujii, Minoru

  2016, Journal of Physical Chemistry C, 120 (50), 28795 - 28801, English

  [Refereed]

  Scientific journal

• Surface Plasmon-Enhanced Luminescence of Silicon Quantum Dots in Gold Nanoparticle Composites

  Inoue, Asuka, Fujii, Minoru, Sugimoto, Hiroshi, Imakita, Kenji

  2015, Journal of Physical Chemistry C, 119 (44)

  [Refereed]

  Scientific journal

• Size-controlled growth of cubic boron phosphide nanocrystals

  Sugimoto, Hiroshi, Fujii, Minoru, Imakita, Kenji

  2015, Rsc Advances, 5 (11)

  [Refereed]

  Scientific journal

• Size and dopant-concentration dependence of photoluminescence properties of ion-implanted phosphorus- and boron-codoped Si nanocrystals

  Nakamura, Toshihiro, Adachi, Sadao, Fujii, Minoru, Sugimoto, Hiroshi, Miura, Kenta, Yamamoto, Shunya

  2015, Physical Review B, 91 (16)

  [Refereed]

  Scientific journal

• Plasmon-Enhanced Emission Rate of Silicon Nanocrystals in Gold Nanorod Composites

  Sugimoto, Hiroshi, Chen, Tianhong, Wang, Ren, Fujii, Minoru, Reinhard, Bjoern M., Dal Negro, Luca

  2015, Acs Photonics, 2 (9)

  [Refereed]

  Scientific journal

• Growth of novel boron-rich nanocrystals from oxygen-deficient borophosphosilicate glasses for boron neutron capture therapy

  Sugimoto, H., Imakita, K., Fujii, M.

  2015, Rsc Advances, 5 (119)

  [Refereed]

  Scientific journal

• Enhanced photoluminescence of Si nanocrystals-doped cellulose nanofibers by plasmonic light scattering

  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)

  [Refereed]

  Scientific journal

• Energy Transfer in Silicon Nanocrystal Solids Made from All-Inorganic Colloidal Silicon Nanocrystals

  Furuta, Kenta, Fujii, Minoru, Sugimoto, Hiroshi, Imakita, Kenji

  2015, Journal of Physical Chemistry Letters, 6 (14)

  [Refereed]

  Scientific journal

• Broadband enhancement of local density of states using silicon-compatible hyperbolic metamaterials

  Wang, Yu, Sugimoto, Hiroshi, Inampudi, Sandeep, Capretti, Antonio, Fujii, Minoru, Dal Negro, Luca

  2015, Applied Physics Letters, 106 (24)

  [Refereed]

  Scientific journal

• Synthesis of boron and phosphorus codoped all-inorganic colloidal silicon nanocrystals from hydrogen silsesquioxane

  Sugimoto, Hiroshi, Fujii, Minoru, Imakita, Kenji

  2014, Nanoscale, 6 (21)

  [Refereed]

  Scientific journal

• Silicon nanocrystals with high boron and phosphorus concentration hydrophilic shell-Raman scattering and X-ray photoelectron spectroscopic studies

  Fujii, Minoru, Sugimoto, Hiroshi, Hasegawa, Masataka, Imakita, Kenji

  2014, Journal of Applied Physics, 115 (8)

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)
• Colloidal hydrophilic silicon germanium alloy nanocrystals with a high boron and phosphorus concentration shell

  Kanno, Takashi, Fujii, Minoru, Sugimoto, Hiroshi, Imakita, Kenji

  2014, Journal of Materials Chemistry C, 2 (28)

  [Refereed]

  Scientific journal

• All-inorganic water-dispersible silicon quantum dots: highly efficient near-infrared luminescence in a wide pH range

  Sugimoto, Hiroshi, Fujii, Minoru, Fukuda, Yuki, Imakita, Kenji, Akamatsu, Kensuke

  2014, Nanoscale, 6 (1)

  [Refereed]

  Scientific journal

• Phosphorus and Boron Codoped Colloidal Silicon Nanocrystals with Inorganic Atomic Ligands

  04 Apr. 2013, The Journal of Physical Chemistry C, English

  [Refereed]

  Scientific journal

• Phosphorus and boron codoped colloidal silicon nanocrystals with inorganic atomic ligands

  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), 6807 - 6813, English

  [Refereed]

  Scientific journal

• Codoping n- and p-Type Impurities in Colloidal Silicon Nanocrystals: Controlling Luminescence Energy from below Bulk Band Gap to Visible Range

  Sugimoto, H., Fujii, M., Imakita, K., Hayashi, S., Akamatsu, K.

  2013, Journal of Physical Chemistry C, 117 (22)

  [Refereed]

  Scientific journal

• All-inorganic near-infrared luminescent colloidal silicon nanocrystals: High dispersibility in polar liquid by phosphorus and boron codoping

  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.

  23 Aug. 2012, Journal of Physical Chemistry C, 116 (33), 17969 - 17974, English

  [Refereed]

  Scientific journal

• All-Inorganic Near-Infrared Luminescent Colloidal Silicon Nanocrystals: High Dispersibility in Polar Liquid by Phosphorus and Boron Codoping

  23 Aug. 2012, The Journal of Physical Chemistry C, English

  [Refereed]

  Scientific journal

• Surfactant-free solution-dispersible Si nanocrystals surface modification by impurity control

  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.

  15 Oct. 2011, Optics Letters, 36 (20), 4026 - 4028, English

  [Refereed]

  Scientific journal

• Surfactant-free solution-dispersible Si nanocrystals surface modification by impurity control

  15 Oct. 2011, Optics Letters, English

  [Refereed]

  Scientific journal

• Acceptor-related low-energy photoluminescence from boron-doped Si nanocrystals

  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.

  15 Sep. 2011, Journal of Applied Physics, 110 (6), 063528, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)
• Acceptor-related low-energy photoluminescence from boron-doped Si nanocrystals

  15 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)

  [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]

• Structural Color Inks Composed of Mie-Resonant Silicon Nanoparticles

  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), 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]

• All-inorganic water-dispersible silicon quantum dots

  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), 22 - 24, Japanese

Books etc

• 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

Presentations

• Experimental Demonstration of Magnetic Purcell Enhancement by Magnetic Resonance of Silicon Nanospheres

  Hiroshi Sugimoto, Minoru Fujii

  2021 Materials Research Society, Fall Meeting, 06 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, 14 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, 13 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, 13 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」, 19 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」, 19 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」, 19 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」, 19 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」, 19 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, 20 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, 20 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, 20 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, 19 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, 19 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, 19 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, 19 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, 19 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, 18 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, 28 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

Association Memberships

• 光化学協会

  Jul. 2020 - Present

• 応用物理学会

  Mar. 2012 - Present

Research Projects

• 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

• 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

• 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

• 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

• Photochemical reaction platform enabled by Mie resonances

  Japan Science and Technology Agency, JST-PRESTO, Kobe Univesity, Oct. 2019 - Mar. 2023, Principal investigator

• 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

  杉本 泰

  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

  半導体量子ドットへの不純物ドーピング技術は、量子効果に起因する特性をさらに高度化するための有望な手段である。本研究では、不純物ドーピングに加えて化学ドーピングを量子ドットに適用した技術により、シリコン量子ドットの高機能化と新機能創出を実現することを目的としている。本年度は，個々のドーピング技術に関して実験的な検討を行い、以下のi)-v)の成果を得た。i)置換型不純物ドーピングに関して、不純物濃度制御による発光波長制御および発光効率の改善に成功した。ii)不純物ドープシリコン量子ドットの成長初期段階のラマン散乱スペクトルおよび透過型電子顕微鏡観察を行い、成長メカニズムに関して知見を得た。iii)NREL(アメリカ合衆国)のグループと共同で、フェムト秒過渡吸収分光法により不純物ドープシリコン量子ドットの光励起キャリアダイナミクスを調べ、量子ドット内の自由キャリアの有無とサイズの関係を明らかにした。iv)貧溶媒添加法によるサイズ分離技術により、シリコン量子ドットのサイズ分布を10%以下に抑制し、発光線幅の抑制に成功した。また、ドナー・アクセプタ対発光のピークエネルギーと再結合レートのサイズ依存性を定量的に決定した。v)化学ドーピングの基礎技術として、電子供与体である亜硫酸イオンを溶解した液中のシリコン量子ドットの発光特性を詳細に調べ、亜硫酸イオンから量子ドットへの電荷移動により光励起により生成した余剰キャリアを補償できることを明らかにした。

• 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。