Analysis of inversion-domain boundaries in four-layer polarity-inverted AlN structure

Tomohiro Tamano, Kanako Shojiki, Toru Akiyama, Ryota Akaike, Takao Nakamura, Hiroto Honda, Eiki Sato, Masahiro Uemukai, Tomoyuki Tanikawa, Ryuji Katayama, Hideto Miyake

Applied Physics Letters　Vol. 126　No. 3　2025/01/20　Research paper (scientific journal)

Metalorganic Vapor‐Phase Epitaxy of +c/−c GaN Polarity Inverted Bilayer for Transverse Quasi‐Phase‐Matched Wavelength Conversion Device

Kazuhisa Ikeda, Shahzeb Malik, Masahiro Uemukai, Tomoyuki Tanikawa, Ryuji Katayama

physica status solidi (b)　Vol. 261　No. 11　2024/09/09　Research paper (scientific journal)

199 nm vacuum-ultraviolet second harmonic generation from SrB₄O₇ vertical microcavity pumped with picosecond laser

Tomoaki Nambu, Masashi YOSHIMURA, Yusuke Mori, Yasufumi FUJIWARA, Ryota Ishii, Yoichi KAWAKAMI, Masahiro Uemukai, Tomoyuki TANIKAWA, Ryuji KATAYAMA

Applied Physics Express　2024/08/01　Research paper (scientific journal)

Continuous-wave operation of InGaN tunable single-mode laser with periodically slotted structure

Taisei Kusui, Takumi Wada, Naritoshi Matsushita, Masahiro Uemukai, Tomoyuki TANIKAWA, Ryuji KATAYAMA

Applied Physics Express　2024/07/23　Research paper (scientific journal)

Design of Horizontally Stacked AlN and Dielectric Cores Transverse Quasi‐Phase‐Matched Channel Waveguide for Squeezed Light Generation

Hiroto Honda, Ryosuke Noro, Masahiro Uemukai, Tomoyuki Tanikawa, Ryuji Katayama

physica status solidi (a)　2024/07/22　Research paper (scientific journal)

Buried annealed proton-exchanged waveguide in periodically-poled MgO:LiTaO<inf>3</inf> fabricated by surface-activated bonding for high-power wavelength conversion

Ryosuke Noro, Masahide Okazaki, Masahiro Uemukai, Tomoyuki Tanikawa, Ryuji Katayama

Japanese Journal of Applied Physics　Vol. 63　No. 6　2024/06/03　Research paper (scientific journal)

Demonstration of a violet-distributed feedback laser with fairly small temperature dependence in current-light characteristics

Toshihiko Fukamachi, Junichi Nishinaka, Koichi Naniwae, Shuichi Usuda, Haruki Fukai, Akihiko Sugitani, Masahiro Uemukai, Tomoyuki Tanikawa, Ryuji Katayama

Applied Physics Express　Vol. 17　No. 5　2024/05/01　Research paper (scientific journal)

Large Area Epitaxial Lateral Overgrowth of Semipolar (1(Formula Presented)01) GaN Stripes on Patterned Si Substrates Prepared using Maskless Lithography

Naofumi Takeda, Masahiro Uemukai, Tomoyuki Tanikawa, Ryuji Katayama

Physica Status Solidi (B) Basic Research　2024　Research paper (scientific journal)

Fabrication of polarity inverted LiNbO₃/GaN channel waveguide by surface activated bonding for high-efficiency transverse quasi-phase-matched wavelength conversion

Ryosuke Noro, Mariko Adachi, Yasufumi Fujiwara, Masahiro Uemukai, Tomoyuki Tanikawa, Ryuji Katayama

Japanese Journal of Applied Physics　Vol. 62　No. 10　p. 102001-102001　2023/10/01　Research paper (scientific journal)

Second harmonic generation from a-plane GaN vertical monolithic microcavity pumped with femtosecond laser

Tomoaki Nambu, Tomohiro Nakahara, Yuma Yasuda, Yasufumi Fujiwara, Masayoshi Tonouchi, Masahiro Uemukai, Tomoyuki Tanikawa, Ryuji Katayama

Applied Physics Express　Vol. 16　No. 7　p. 072005-072005　2023/07/01　Research paper (scientific journal)

229 nm far-ultraviolet second harmonic generation in a vertical polarity inverted AlN bilayer channel waveguide

Hiroto Honda, Soshi Umeda, Kanako Shojiki, Hideto Miyake, Shuhei Ichikawa, Jun Tatebayashi, Yasufumi Fujiwara, Kazunori Serita, Hironaru Murakami, Masayoshi Tonouchi, Masahiro Uemukai, Tomoyuki Tanikawa, Ryuji Katayama

Applied Physics Express　Vol. 16　No. 6　p. 062006-062006　2023/06/01　Research paper (scientific journal)

Observation of nanopipes in edge-defined film-fed grown β-Ga2O3 substrate and their effect on homoepitaxial surface hillocks

Tomoka Nishikawa, Ken Goto, Hisashi Murakami, Yoshinao Kumagai, Masahiro Uemukai, Tomoyuki Tanikawa, Ryuji Katayama

Japanese Journal of Applied Physics　2023/06/01　Research paper (scientific journal)

Polarity Inversion of GaN via AlN Oxidation Interlayer Using Metal–Organic Vapor Phase Epitaxy

Tomotaka Murata, Kazuhisa Ikeda, Jun Yamasaki, Masahiro Uemukai, Tomoyuki Tanikawa, Ryuji Katayama

physica status solidi (b)　2023/03/22　Research paper (scientific journal)

Status of the search for ${}^{48}$ Ca double beta decay with CANDLES

Yuto Minami, "Kenichi Fushimi", "Akihiro Hashimoto", "Ryuta Hazama", "Tasuku Hiraiwa", "Takashi Iida", "Yumiko Kishida", "Tadafumi Kishimoto", "Pantiwa Kumsut", "Kenji Matsuoka", "Noriaki Miyanaga", "Go Miyoshi", "Yoshiki Muramatsu", "Kyohei Nakajima", "Jun'ya Nakajima", "Hideaki Niki", "Yudai Niwa", "Izumi Ogawa", "Hironori Okuda", "Anawat Rittirong", "Toshiki Sakai", "Akitoshi Sakaue", "Kohtaku Suzuki", "Yukichi Takihira", "Yoichi Tamagawa", "Shigeki Tokita", "Masashi Tozawa", "Masahiro Uemukai", "Sei Yoshida", "Atsushi Yoshioka", "Ren Yuhaku"

Proceedings of 41st International Conference on High Energy physics — PoS(ICHEP2022)　2023/01/31　Research paper (international conference proceedings)

Laser isotope separation to study for the neutrino-less double beta decay of ⁴⁸Ca

I. Ogawa, T. Hiraiwa, J. Nakajima, R. Yuhaku, M. Tozawa, H. Niki, S. Tokita, N. Miyanaga, M. Uemukai, A. Rittirong, S. Umehara, K. Matsuoka, S. Yoshida

Journal of Physics: Conference Series　Vol. 2586　No. 1　2023　Research paper (international conference proceedings)

Second harmonic generation in GaN transverse quasi-phase-matched waveguide pumped with femtosecond laser

Naoki Yokoyama, Yoshiki Morioka, Tomotaka Murata, Hiroto Honda, Kazunori Serita, Hironaru Murakami, Masayoshi Tonouchi, Shigeki Tokita, Shuhei Ichikawa, Yasufumi Fujiwara, Toshiki Hikosaka, Masahiro Uemukai, Tomoyuki Tanikawa, Ryuji Katayama

Applied Physics Express　Vol. 15　No. 11　p. 112002-112002　2022/11/01　Research paper (scientific journal)

Fabrication and evaluation of rib-waveguide-type wavelength conversion devices using GaN-QPM crystals

Hiroki Ishihara, Keiya Shimada, Soshi Umeda, Naoki Yokoyama, Hiroto Honda, Kazuhiro Kurose, Yoshimasa Kawata, Atsushi Sugita, Yoku Inoue, Masahiro Uemukai, Tomoyuki Tanikawa, Ryuji Katayama, Takayuki Nakano

Japanese Journal of Applied Physics　Vol. 61　No. SK　p. SK1020-SK1020　2022/08/01　Research paper (scientific journal)

Enlargement of mode size in annealed proton-exchanged periodically-poled MgO doped stoichiometric LiTaO₃ waveguide for high power second harmonic generation

Ryosuke Noro, Masahide Okazaki, Ikuo Mizobata, Masahiro Uemukai, Tomoyuki Tanikawa, Ryuji Katayama

Japanese Journal of Applied Physics　Vol. 61　No. 7　p. 072006-072006　2022/07/01　Research paper (scientific journal)

DUV coherent light emission from ultracompact microcavity wavelength conversion device

Tomoaki Nambu, Taketo Yano, Soshi Umeda, Naoki Yokoyama, Hiroto Honda, Yasunori Tanaka, Yutaka Maegaki, Yusuke Mori, Masashi Yoshimura, Shuhei Kobayashi, Shuhei Ichikawa, Yasufumi Fujiwara, Ryota Ishii, Yoichi Kawakami, Masahiro Uemukai, Tomoyuki Tanikawa, Ryuji Katayama

Optics Express　Vol. 30　No. 11　p. 18628-18628　2022/05/23　Research paper (scientific journal)

GaN channel waveguide with vertically polarity inversion formed by surface activated bonding for wavelength conversion

Naoki Yokoyama, Ryo Tanabe, Yuma Yasuda, Hiroto Honda, Shuhei Ichikawa, Yasufumi Fujiwara, Toshiki Hikosaka, Masahiro Uemukai, Tomoyuki Tanikawa, Ryuji Katayama

Japanese Journal of Applied Physics　Vol. 61　No. 5　p. 050902-050902　2022/05/01　Research paper (scientific journal)

Emission color modulation of InGaN/GaN multiple quantum wells by selective area metalorganic vapor phase epitaxy on hexagonal windows

Shin Yoshida, Kanako Shojiki, Hideto Miyake, Masahiro Uemukai, Tomoyuki Tanikawa, Ryuji Katayama

Japanese Journal of Applied Physics　Vol. 61　No. 3　p. 030904-030904　2022/03/01　Research paper (scientific journal)

Monolithic microcavity second harmonic generation device using low birefringence paraelectric material without polarity-inverted structure

Tomoaki Nambu, Takumi Nagata, Soshi Umeda, Keishi Shiomi, Yasufumi Fujiwara, Toshiki Hikosaka, Abdul Mannan, Filchito Renee G. Bagsican, Kazunori Serita, Iwao Kawayama, Masayoshi Tonouchi, Masahiro Uemukai, Tomoyuki Tanikawa, Ryuji Katayama

Applied Physics Express　Vol. 14　No. 6　p. 061004-061004　2021/06/01　Research paper (scientific journal)

Identification of Burgers vectors of threading dislocations in freestanding GaN substrates via multiphoton-excitation photoluminescence mapping

Mayuko Tsukakoshi, Tomoyuki Tanikawa, Takumi Yamada, Masayuki Imanishi, Yusuke Mori, Masahiro Uemukai, Ryuji Katayama

Applied Physics Express　Vol. 14　No. 5　p. 055504-055504　2021/05/01　Research paper (scientific journal)

GaAsP quantum well tunable single-mode laser with periodically slotted structure

Masahiro Uemukai, Takashi Furusawa

Conference Digest - IEEE International Semiconductor Laser Conference　2016/12/02　Research paper (international conference proceedings)

GaAsP tunable distributed Bragg reflector laser with indium tin oxide thin-film heater

Masahiro Uemukai, Toshiaki Suhara

JAPANESE JOURNAL OF APPLIED PHYSICS　Vol. 55　No. 8　2016/08　Research paper (scientific journal)

GaAsP Quantum Well Tunable Single-Mode Laser with Periodically Slotted Structure

Masahiro Uemukai, Takashi Furusawa

2016 INTERNATIONAL SEMICONDUCTOR LASER CONFERENCE (ISLC)　2016　Research paper (international conference proceedings)

Single-mode operation of GaAsP ring/Fabry-Perot composite cavity semiconductor lasers

Ashim Kumar Saha, Masahiro Uemukai, Toshiaki Suhara

JAPANESE JOURNAL OF APPLIED PHYSICS　Vol. 54　No. 6　2015/06　Research paper (scientific journal)

InGaAs ridge-waveguide distributed Bragg reflector laser with first-order grating fabricated by nanoimprint lithography

Masahiro Uemukai, Shohei Terai, Toshiaki Suhara

JAPANESE JOURNAL OF APPLIED PHYSICS　Vol. 54　No. 5　2015/05　Research paper (scientific journal)

GaAsP TUNABLE DISTRIBUTED BRAGG REFLECTOR LASER WITH ITO THIN-FILM HEATER

Masahiro Uemukai, Toshiaki Suhara

2015 20TH MICROOPTICS CONFERENCE (MOC)　2015　Research paper (international conference proceedings)

InGaAs Circular-Grating-Coupled Surface Emitting Laser with Focusing Function Fabricated by Electron Beam Writing with Circular Scanning

Ashim Kumar Saha, Masahiro Uemukai, Toshiaki Suhara

OPTICAL REVIEW　Vol. 21　No. 3　p. 206-209　2014/05　Research paper (scientific journal)

Phase-Shifted Fresnel Zone Lenses for Photomixing Generation of Coherent THz Wave

Anand Vijayakumar, Masahiro Uemukai, Toshiaki Suhara

JAPANESE JOURNAL OF APPLIED PHYSICS　Vol. 51　No. 7　2012/07　Research paper (scientific journal)

Rotation-Symmetric Multispot Focusing Phase-Shifted Grating Coupler for Integrated Semiconductor Laser

Kengo Uenishi, Masahiro Uemukai, Toshiaki Suhara

JAPANESE JOURNAL OF APPLIED PHYSICS　Vol. 51　No. 5　2012/05　Research paper (scientific journal)

Integrated AlGaAs Quantum-Well Ridge-Structure Two-Wavelength Distributed Bragg Reflector Laser for Terahertz Wave Generation

Masahiro Uemukai, Hidenao Ishida, Akira Ito, Toshiaki Suhara, Hidenori Kitajima, Akiyoshi Watanabe, Hirofumi Kan

JAPANESE JOURNAL OF APPLIED PHYSICS　Vol. 51　No. 2　2012/02　Research paper (scientific journal)

Integrated AlGaAs Quantum-Well Ridge-Structure Two-Wavelength DBR Laser for THz Wave Generation

M. Uemukai, H. Ishida, A. Ito, T. Suhara, H. Kitajima, A. Watanabe, H. Kan

22ND IEEE INTERNATIONAL SEMICONDUCTOR LASER CONFERENCE　Vol. TuC4, pp.74-75　p. 61-+　2010　Research paper (international conference proceedings)

High-efficiency InGaAs/AlGaAs quantum well distributed Bragg reflector laser with curved grating

Masahiro Uemukai, Kazutoshi Kitano, Naoyuki Shimada, Toshiaki Suhara

Japanese Journal of Appled Physics, Vol.43, No.8B, pp.5918-5921　Vol. 43　No. 8　p. 5918-5921　2004/08　Research paper (scientific journal)

Monolithic integration of lasers and passive elements using selective QW disordering by rapid thermal annealing with SiO2 caps of different thicknesses

N Shimada, Y Fukumoto, M Uemukai, T Suhara, H Nishihara, A Larsson

ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS　Vol. 87　No. 1　p. 34-42　2004　Research paper (scientific journal)

InGaAs angled-grating distributed bragg reflector lasers integrated with grating outcoupler for collimation

M. Uemukai, Y. Kunoh, N. Shimada, T. Suhara

Conference Digest-IEEE International Semiconductor Laser Conference　p. 27-28　2002　Research paper (scientific journal)

Tunable external-cavity quantum-well laser using grating coupler integrated in selectively disordered waveguide

N Shimada, K Yutani, M Uemukai, T Suhara, A Larsson

IEICE TRANSACTIONS ON ELECTRONICS　Vol. E85C　No. 1　p. 79-84　2002/01　Research paper (scientific journal)

Monolithic integration of laser and passive elements using selective QW disordering by RTA with SiO2 caps of different thicknesses

N Shimada, Y Fukumoto, M Uemukai, T Suhara, H Nishihara, A Larsson

IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS　Vol. 7　No. 2　p. 350-354　2001/03　Research paper (scientific journal)

A monolithically integrated InGaAs-AlGaAs master oscillator power amplifier with grating outcoupler

M Uemukai, N Matsumoto, T Suhara, H Nishihara, N Eriksson, A Larsson

ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS　Vol. 84　No. 3　p. 61-70　2001　Research paper (scientific journal)

Selective disordering of InGaAs strained quantum well by rapid thermal annealing with SiO2 caps of different thicknesses for photonic integration

N Shimada, Y Fukumoto, M Uemukai, T Suhara, H Nishihara, A Larsson

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS　Vol. 39　No. 10　p. 5914-5915　2000/10　Research paper (scientific journal)

Selective disordering of InGaAs strained quantum well by rapid thermal annealing with SiO2 caps of different thicknesses for photonic integration

N Shimada, Y Fukumoto, M Uemukai, T Suhara, H Nishihara, A Larsson

2000 IEEE 17TH INTERNATIONAL SEMICONDUCTOR LASER CONFERENCE, CONFERENCE DIGEST　p. 117-118　2000　Research paper (international conference proceedings)

Tunable external-cavity semiconductor laser using monolithically integrated tapered amplifier and grating coupler for collimating

M Uemukai, T Suhara, K Yutani, N Shimada, Y Fukumoto, H Nishihara, A Larsson

2000 IEEE 17TH INTERNATIONAL SEMICONDUCTOR LASER CONFERENCE, CONFERENCE DIGEST　p. 37-38　2000　Research paper (international conference proceedings)

Grating coupled surface emitters: integrated lasers, amplifiers, and beam shaping outcouplers

A Larsson, N Eriksson, S Kristjansson, P Modh, M Uemukai, T Suhara, H Nishihara

TESTING, PACKAGING, RELIABILITY, AND APPLICATIONS OF SEMICONDUCTOR LASERS IV　Vol. 3626　p. 190-201　1999　Research paper (international conference proceedings)

Grating-coupled surface-emitters with built-in beam control

N Eriksson, S Kristjansson, P Modh, A Larsson, M Uemukai, A Yoshimoto, N Matsumoto, T Suhara, H Nishihara

PROCEEDINGS OF THE SYMPOSIUM ON LIGHT EMITTING DEVICES FOR OPTOELECTRONIC APPLICATIONS AND THE TWENTY-EIGHTH STATE-OF-THE-ART PROGRAM ON COMPOUND SEMICONDUCTORS　Vol. 98　No. 2　p. 136-153　1998　Research paper (international conference proceedings)

Monolithic integration of QW-DFB laser master oscillator power amplifier and grating outcoupler

T Suhara, M Uemukai, A Yoshimoto, N Matsumoto, H Nishihara, S Iio, M Suehiro, M Wada

ELECTRONICS LETTERS　Vol. 33　No. 14　p. 1228-1229　1997/07　Research paper (scientific journal)

Monolithic integration of waveguide gratings and quantum-well distributed-feedback laser for implementation of subminiature optical-disc pickup head

T Suhara, T Taniguchi, M Uemukai, A Yoshimoto, H Nishihara, T Hirata, S Iio, M Suehiro

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS　Vol. 35　No. 1B　p. 369-371　1996/01　Research paper (scientific journal)

INTEGRATION OF LASER-DIODES AND PHOTODIODES IN PHOTONIC INTEGRATED-CIRCUIT FOR MEASUREMENT

T HIRATA, S IIO, M SUEHIRO, M HIHARA, T SUHARA, M UEMUKAI, T TANIGUCHI, H NISHIHARA

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS　Vol. 34　No. 10A　p. L1288-L1290　1995/10　Research paper (scientific journal)