Prof. Yoichi Kawakami Profile

Prof. Yoichi Kawakami

Professor of Kawakami Lab. at Kyoto Univ

SPIE Involvement:

Conference Program Committee | Author

Publications (34)

Proceedings Article | 4 October 2024 Presentation

Optoelectronic properties of ultrawide-band-gap semiconductors probed by deep-ultraviolet spectroscopy

Ryota Ishii, Mitsuru Funato, Yoichi Kawakami

Proceedings Volume PC13115, PC1311509 (2024) https://doi.org/10.1117/12.3028588

KEYWORDS: Deep ultraviolet, Spectroscopy, Semiconductors, Optoelectronics, Near field scanning optical microscopy, Spatial resolution, Quantum control, Physics, Luminescence, Excitons

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Proceedings Article | 9 March 2024 Presentation

MOVPE of (In)GaN on ScAlMgO4 substrates toward long wavelength optical devices

Mitsuru Funato, Yoshinobu Matsuda, Yoichi Kawakami

Proceedings Volume PC12886, PC1288604 (2024) https://doi.org/10.1117/12.3002185

KEYWORDS: Indium gallium nitride, Optical components, Light emitting diodes, Quantum wells, Internal quantum efficiency, Vapor phase epitaxy, Quantum interfaces, Quantum efficiency, Quantum devices, Quantum control

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Proceedings Article | 21 March 2023 Presentation

Spontaneous and stimulated emission physics of aluminum nitride

Ryota Ishii, Toru Nagashima, Reo Yamamoto, Tatsuya Hitomi, Mitsuru Funato, Yoichi Kawakami

Proceedings Volume PC12421, (2023) https://doi.org/10.1117/12.2647637

KEYWORDS: Aluminum nitride, Physics, Crystals, Cryogenics, Semiconductors, Scattering, Optical properties, Excimer lasers, Epitaxy, Emission spectroscopy

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Proceedings Article | 15 March 2023 Presentation + Paper

ScAlMgO4 as a promising substrate for InGaN-based long wavelength emitters: demonstration of far-red LEDs

Mitsuru Funato, Keita Maehara, Yoshinobu Matsuda, Takuya Ozaki, Yoichi Kawakami

Proceedings Volume 12421, 1242102 (2023) https://doi.org/10.1117/12.2649997

KEYWORDS: Light emitting diodes, Design and modelling, Indium gallium nitride, Gallium nitride, Magnesium, Emission wavelengths, Electroluminescence, Electrical conductivity

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Proceedings Article | 3 October 2022 Poster

Significant improvement of green light emission efficiency of InGaN/GaN quantum wells by oxide thin films

Seiya Kaito, Tetsuya Matsuyama, Kenji Wada, Mitsuru Funato, Yoichi Kawakami, Koichi Okamoto

Proceedings Volume PC12197, PC121971O (2022) https://doi.org/10.1117/12.2633221

KEYWORDS: Thin films, Quantum wells, Quantum efficiency, Oxides, Metals, Ultraviolet radiation, Surface plasmons, Light emitting diodes, Indium gallium nitride, Resonance enhancement

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Proceedings Article | 5 March 2022 Presentation

Polar-plane-free faceted InGaN polychromatic emitters with fast carrier recombination processes

Mitsuru Funato, Yoshinobu Matsuda, Yoichi Kawakami

Proceedings Volume PC12001, PC1200111 (2022) https://doi.org/10.1117/12.2608556

KEYWORDS: Quantum wells, Indium gallium nitride, Picosecond phenomena, Light emitting diodes, Vapor phase epitaxy, Time resolved spectroscopy, Spectroscopy, Modulation, Luminescence, Gallium nitride

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Proceedings Article | 5 March 2022 Presentation

Luminescence spectroscopies on 265-nm AlGaN DUV LEDs and AlN films grown on AlN substrates

Ryota Ishii, Mitsuru Funato, Yoichi Kawakami

Proceedings Volume PC12001, PC120010S (2022) https://doi.org/10.1117/12.2608423

KEYWORDS: Aluminum nitride, Light emitting diodes, Deep ultraviolet, Luminescence, External quantum efficiency, Spectroscopy, Internal quantum efficiency, Quantum efficiency, Applied physics, Silicon

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Proceedings Article | 5 March 2021 Presentation

Recent progress in deep-ultraviolet scanning near-field optical microscope: a tool visualizing the luminescence properties of Al-rich AlGaN active layers

Ryota Ishii, Mitsuru Funato, Yoichi Kawakami

Proceedings Volume 11686, 116861S (2021) https://doi.org/10.1117/12.2576763

KEYWORDS: Near field scanning optical microscopy, Luminescence, Deep ultraviolet, Visualization, Optical microscopes, Spectroscopy, Quantum efficiency, Photonics, Light emitting diodes, Viruses

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Proceedings Article | 5 March 2021 Presentation

Ultrathin GaN/AlN quantum wells for deep UV emitters

Mitsuru Funato, Yoichi Kawakami

Proceedings Volume 11686, 116860W (2021) https://doi.org/10.1117/12.2577156

KEYWORDS: Quantum wells, Gallium nitride, Deep ultraviolet, Aluminum nitride, Crystals, Vapor phase epitaxy, Ultraviolet radiation, Skin, Sapphire, Optical properties

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Proceedings Article | 16 February 2017 Presentation + Paper

Plasmonics toward high-efficiency LEDs from the visible to the deep-UV region

K. Okamoto, M. Funato, Y. Kawakami, N. Okada, K. Tadatomo, K. Tamada

Proceedings Volume 10124, 101240R (2017) https://doi.org/10.1117/12.2249589

KEYWORDS: Light emitting diodes, Plasmonics, Deep ultraviolet, Metals, Surface plasmons, Visible radiation, Nanoparticles, Aluminum, Nanostructures, Ultraviolet radiation, Quantum wells, Silver, Interfaces

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Proceedings Article | 16 February 2017 Paper

Design of Al-rich AlGaN quantum well structures for efficient UV emitters

Mitsuru Funato, Shuhei Ichikawa, Kyosuke Kumamoto, Yoichi Kawakami

Proceedings Volume 10104, 101040I (2017) https://doi.org/10.1117/12.2254797

KEYWORDS: Quantum wells, Ultraviolet radiation, X-ray diffraction, Crystals, Light emitting diodes, Aluminum nitride, Luminescence, Internal quantum efficiency, Gallium, Scanning electron microscopy, Polarization, Picosecond phenomena, Optical properties

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Proceedings Article | 15 September 2016 Presentation + Paper

Enhanced radiative recombination probability in AlGaN quantum wires on (0001) vicinal surface

Minehiro Hayakawa, Yuki Hayashi, Shuhei Ichikawa, Mitsuru Funato, Yoichi Kawakami

Proceedings Volume 9926, 99260S (2016) https://doi.org/10.1117/12.2237606

KEYWORDS: Transmission electron microscopy, Quantum wells, Aluminum nitride, Excitons, Gallium, Diffusion, Optical properties, Scanning electron microscopy, Luminescence, Spectroscopy

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Proceedings Article | 26 February 2016 Paper

Approaches to highly efficient UV emitters based on AlGaN quantum wells

Shuhei Ichikawa, Mitsuru Funato, Yoichi Kawakami

Proceedings Volume 9748, 97480U (2016) https://doi.org/10.1117/12.2208779

KEYWORDS: Quantum wells, Crystals, Polarization, Aluminum nitride, Ultraviolet radiation, Deep ultraviolet, Light, Quantum efficiency, Light sources, Aluminum, Gallium, Phonons, Sapphire, Light emitting diodes

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Proceedings Article | 13 March 2015 Paper

Semi/non-polar nitride quantum wells for high-efficient light emitters

Mitsuru Funato, Yoichi Kawakami

Proceedings Volume 9363, 93631T (2015) https://doi.org/10.1117/12.2078873

KEYWORDS: Quantum wells, Aluminum nitride, Excitons, Indium gallium nitride, Optical properties, Gallium nitride, Near field scanning optical microscopy, Polarization, Transmission electron microscopy, Light emitting diodes

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Proceedings Article | 8 March 2014 Paper

Multi-wavelength light emission from three-dimensional AlGaN quantum wells fabricated on facet structures

Ken Kataoka, Masanori Yamaguchi, Kensuke Fukushima, Mitsuru Funato, Yoichi Kawakami

Proceedings Volume 8986, 898627 (2014) https://doi.org/10.1117/12.2037286

KEYWORDS: Quantum wells, Aluminum nitride, Aluminum, Sapphire, Transmission electron microscopy, Scanning electron microscopy, Indium gallium nitride, Gallium nitride, Ultraviolet radiation, Atomic force microscopy

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Proceedings Article | 16 February 2012 Paper

Fabrication of photo-induced microstructure embedded inside ZnO crystal

Yuichiro Ishikawa, Yasuhiko Shimotsuma, Akio Kaneta, Masaaki Sakakura, Masayuki Nishi, Kiyotaka Miura, Kazuyuki Hirao, Yoichi Kawakami

Proceedings Volume 8243, 82430N (2012) https://doi.org/10.1117/12.908190

KEYWORDS: Zinc oxide, Crystals, Femtosecond phenomena, Semiconductors, Pulsed laser operation, Plasma, Oxygen, Silicon, Laser irradiation, Laser crystals

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Proceedings Article | 19 February 2009 Paper

Multi-color light-emitting diodes based on GaN microstructures

M. Funato, Y. Kawakami, Y. Narukawa, T. Mukai

Proceedings Volume 7216, 721624 (2009) https://doi.org/10.1117/12.808641

KEYWORDS: Light emitting diodes, Electroluminescence, Quantum wells, Control systems, Gallium nitride, Solid state lighting, Indium gallium nitride, Polarization, Silica, Quantum efficiency

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Proceedings Article | 13 February 2008 Paper

Surgical retractor with RGB-WHITE LEDs

Jun-ichi Shimada, Daishiro Kato, Kunihiko Terauchi, Kazuhiro Itoh, Masashi Yanada, Masanori Shimomura, Hiroaki Tsuneduka, Yoichi Kawakami

Proceedings Volume 6910, 69100T (2008) https://doi.org/10.1117/12.761979

KEYWORDS: Light emitting diodes, Light sources and illumination, Surgery, Tissues, Light sources, RGB color model, Lung, Blood, Endoscopy, Color difference

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Proceedings Article | 8 February 2007 Paper

Investigation and comparison of optical gain spectra of (Al,In)GaN laser diodes emitting in the 375nm to 470 nm spectral range

Ulrich Schwarz, Harald Braun, Kazunobu Kojima, Mitsuru Funato, Yoichi Kawakami, Shinichi Nagahama, Takashi Mukai

Proceedings Volume 6485, 648506 (2007) https://doi.org/10.1117/12.705867

KEYWORDS: Semiconductor lasers, Quantum wells, Indium gallium nitride, Near ultraviolet, Indium, Electrons, Optical simulations, Standards development, Gallium, Data modeling

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Proceedings Article | 22 February 2006 Paper

The innovations with the medical applications of white LEDs and the breakthrough for new business

Jun-ichi Shimada, Kazuhiro Itoh, Motohiro Nishimura, Youichi Kawakami, Kiyotsugu Tsuji

Proceedings Volume 6134, 613408 (2006) https://doi.org/10.1117/12.645967

KEYWORDS: Light emitting diodes, Surgery, Light sources and illumination, LED lighting, Endoscopy, Light sources, Solid state lighting, Light, Arteries, Veins

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Proceedings Article | 13 April 2005 Paper

Surface plasmon enhanced InGaN light emitter

Koichi Okamoto, Isamu Niki, Alexander Shvartser, George Maltezos, Yukio Narukawa, Takashi Mukai, Koji Nishizuka, Yoichi Kawakami, Axel Scherer

Proceedings Volume 5733, (2005) https://doi.org/10.1117/12.592261

KEYWORDS: Surface plasmons, Quantum wells, Silver, Metals, Gallium nitride, Aluminum, Indium gallium nitride, Light emitting diodes, Luminescence, Gold

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Proceedings Article | 25 July 2003 Paper

Recombination mechanism in low-dimensional nitride semiconductors

Yoichi Kawakami, Akio Kaneta, Koichi Okamoto, Tsutomu Inoue, Fuminori Satou, Yoshihito Narita, Fritz Henneberger, Giichi Marutsuki, Yukio Narukawa, Takashi Mukai, Shigeo Fujita

Proceedings Volume 4986, (2003) https://doi.org/10.1117/12.480854

KEYWORDS: Near field scanning optical microscopy, Semiconductors, Excitons, Luminescence, Picosecond phenomena, Quantum wells, Light emitting diodes, Optical microscopy, Gallium nitride, Near field optics

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Proceedings Article | 3 July 2003 Paper

Development of lighting goggles with power white LED modules

Junichi Shimada, Yoichi Kawakami, Shigeo Fujita

Proceedings Volume 4996, (2003) https://doi.org/10.1117/12.476558

KEYWORDS: Light emitting diodes, Surgery, Goggles, LED lighting, Light sources and illumination, Aluminum nitride, Light sources, Head, Ceramics, Bone

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Proceedings Article | 30 May 2003 Paper

Nonlinear optical dynamics in GaN and related materials

Amane Shikanai, Kouji Hazu, Takayuki Sota, Katsuo Suzuki, Yoichi Kawakami, Shigeo Fujita

Proceedings Volume 4992, (2003) https://doi.org/10.1117/12.473276

KEYWORDS: Indium gallium nitride, Luminescence, Gallium nitride, Transmittance, Electrons, Upconversion, Silicon, Carrier dynamics, Temperature metrology, Spectroscopy

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Proceedings Article | 5 December 2001 Paper

Surgical operation using lighting goggle composed of white LED arrays

Junichi Shimada, Yoichi Kawakami, Shigeo Fujita

Proceedings Volume 4445, (2001) https://doi.org/10.1117/12.450042

KEYWORDS: Light emitting diodes, Surgery, Light sources and illumination, Goggles, LED lighting, Lamps, Head, Light sources, Arteries, Control systems

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Proceedings Article | 5 December 2001 Paper

Fabrication of LED lighting goggle for surgical operation and approach toward high-color rendering performance

Yoichi Kawakami, Junichi Shimada, Shigeo Fujita

Proceedings Volume 4445, (2001) https://doi.org/10.1117/12.450039

KEYWORDS: Light emitting diodes, Light sources and illumination, LED lighting, Goggles, Indium gallium nitride, Aluminum, Surgery, Chromium, Diamond, Packaging

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Proceedings Article | 14 May 2001 Paper

Direct observation of the nonradiative recombination processes in InGaN-based LEDs probed by the third-order nonlinear spectroscopy

Koichi Okamoto, Shin Saijou, Yoichi Kawakami, Shigeo Fujita, Mashahide Terazima, Genichi Shimomiya, Takashi Mukai

Proceedings Volume 4278, (2001) https://doi.org/10.1117/12.426845

KEYWORDS: Light emitting diodes, Spectroscopy, Diffusion, Excitons, Picosecond phenomena, Luminescence, Manufacturing, Quantum wells, Lithium, Nd:YAG lasers

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Proceedings Article | 14 May 2001 Paper

Medical lighting composed of LED arrays for surgical operation

Junichi Shimada, Yoichi Kawakami, Shigeo Fujita

Proceedings Volume 4278, (2001) https://doi.org/10.1117/12.426847

KEYWORDS: Light emitting diodes, Surgery, Light sources and illumination, Goggles, Lamps, LED lighting, Head, Light sources, Arteries, Skin

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Proceedings Article | 10 May 2001 Paper

Time-resolved fluorescence spectroscopy of dopamine in single cells

Michiaki Mabuchi, Junichi Shimada, Koichi Okamoto, Yoichi Kawakami, Shigeo Fujita, Kazumi Matsushige

Proceedings Volume 4252, (2001) https://doi.org/10.1117/12.426738

KEYWORDS: Luminescence, Time resolved spectroscopy, Nerve, Spectroscopy, Streak cameras, Fluorescence spectroscopy, Molecules, Optical microscopes, Deep ultraviolet, Visualization

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Proceedings Article | 23 April 2001 Paper

Dynamics of spontaneous and stimulated emissions in GaN-based semiconductors

Yoichi Kawakami, Kunimichi Omae, Akio Kaneta, Koichi Okamoto, Tomoaki Izumi, Shin Saijou, Kenichi Inoue, Yukio Narukawa, Takashi Mukai, Shigeo Fujita

Proceedings Volume 4280, (2001) https://doi.org/10.1117/12.424742

KEYWORDS: Excitons, Gallium, Electroluminescence, Light emitting diodes, Picosecond phenomena, Gallium nitride, Spectroscopy, Absorption, Near ultraviolet, Absorbance

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Proceedings Article | 3 October 1996 Paper

Zn1-xCdxSe/ZnSe multiple quantum well photomodulators

Jiuyao Tang, Yoichi Kawakami, Shizuo Fujita, Shigeo Fujita

Proceedings Volume 2897, (1996) https://doi.org/10.1117/12.252945

KEYWORDS: Reflection, Modulators, Modulation, Absorption, Mirrors, Quantum wells, Gallium arsenide, Aluminum, Glasses, Excitons

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Proceedings Article | 3 October 1996 Paper

Photocurrent spectrum of p-i-n Zn1-xCdxSe/ZnSe multiple quantum well heterostructures

Jiu Tang, Yoichi Kawakami, Shizuo Fujita, Shigeo Fujita

Proceedings Volume 2897, (1996) https://doi.org/10.1117/12.252944

KEYWORDS: Excitons, Quantum wells, Heterojunctions, Photons, Cadmium, Absorption, Molecular beam epitaxy, Optoelectronic devices, Light emitting diodes, Gallium arsenide

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Proceedings Article | 21 December 1994 Paper

Gas source molecular beam epitaxy (MBE) of ZnMgSSe layers

Shizuo Fujita, Jun Suda, Yoichi Kawakami, Shigeo Fujita

Proceedings Volume 2346, (1994) https://doi.org/10.1117/12.197261

KEYWORDS: Magnesium, Quantum wells, Excitons, Zinc, Selenium, Gallium arsenide, Semiconductor lasers, Molecular beam epitaxy, Heterojunctions, Chlorine

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