論文 - 梅津 郁朗
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パルスレーザアブレーション法による可視光応答型プラズモニック光触媒の創製 査読あり
電気学会論文誌 C(電子・情報・システム部門誌) 144 1100 - 1103 2024年11月
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シリコンへの硫黄の過飽和ドーピングがもたらす光学的・電気的特性の変化 査読あり
川本 兼司, 香野 淳,青木 珠緖,梅津 郁朗
電気学会論文誌 C(電子・情報・システム部門誌) 144 1066 - 1070 2024年11月
担当区分：責任著者
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Study on Collision Process of Opposing Unsteady Supersonic Jets and Shock Waves 査読あり
Sakira Uno, Hiroshi Fukuoka, Atsushi Suda, Ikurou Umezu
Open Journal of Fluid Dynamics 13 ( 2 ) 104 - 112 2023年5月
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Mixing of laser‐induced plumes colliding in a background gas 査読あり
Keita Katayama,Toshiki Kinoshita,Ren Okada,Hiroshi Fukuoka,Takehito Yoshida,Minoru Yaga,Tamao Aoki‐Matsumoto, Ikurou Umezu
Applied Physics A 128 2022年10月
担当区分：最終著者, 責任著者
We collided silicon and germanium laser-induced plumes in helium background gas to clarify the behavior of the plumes after the collision. The expansion of the silicon and germanium species in the mixed plume after the collision was observed separately by spectroscopic measurements and the degree of mixing was evaluated by the experimental results. When the pressure of the background gas was 2000 Pa, the plumes moved backward after the collision with the counter-propagating shock wave, and no mixing of the plumes was observed. The effect of the counter-propagating shock wave was discussed by comparing with the results of numerical calculations based on the compressible Euler equations. At 300 Pa, the plumes concentrated at about 1 mm around the central region just after the collision and almost 100% mixing occurred in this region. The concentration and mixing of the plumes in the central region is a key to forming well-mixed plume. Stagnation and partial mixing of the plumes were observed at intermediate pressures. By decreasing the background helium gas pressure from 2000 to 300 Pa, the degree of mixing increased from 0 to about 100%. The results are compared with those in argon background gas to discuss effects of mean free path. The effects of counter-propagating shock wave, mean free path and the onset time of the collision on the backward movement and mixing of the plumes are discussed.
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リアルタイムオンライン指導により学生自身が自宅で行う実験・実習 査読あり
市田 正夫, 青木 珠緖, 秋宗 秀俊, 梅津 郁朗
物理教育 69 ( 4 ) 257 - 264 2021年
担当区分：最終著者
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学生実験の作業化への懸念と対応 査読あり
梅津郁朗、青木珠緖、市田正夫、山﨑篤志、山本常夏
物理教育 68 268 - 272 2020年12月
共著
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Expansion of laser-induced plume after the passage of a counter shock wave through a background gas 査読あり
Akira Higo, Keita Katayama, Hiroshi Fukuoka , akehito Yoshida, Tamao Aoki, Minoru Yaga, Ikurou Umezu
Applied Physics A 126 ( 4 ) 2020年3月
共著
担当区分：最終著者, 責任著者
DOI： 10.1007/s00339-020-03476-8
その他リンク： http://link.springer.com/article/10.1007/s00339-020-03476-8/fulltext.html
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Effect of counter shock wave on the expanding plume 査読あり
Katayama Keita, Horai Yuki, Fukuoka Hiroshi, Kinoshita Toshiki, Yoshida Takehito, Aoki Tamao, Umezu Ikurou
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING 124 ( 2 ) 2018年2月
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Numerical analysis of behavior on opposing unsteady supersonic jets in a flow field with shields 査読あり
Toshiki Kinoshita, Hiroshi Fukuoka, Ikurou Umezu
Materials Science Forum 910 96 - 101 2018年1月
共著
担当区分：最終著者
© 2018 Trans Tech Publications, Switzerland. Collision dynamics of opposing unsteady supersonic jets injected in background gas with shock waves were calculated to simulate double pulsed laser ablation. Since the jets are deflected by collision and the motion of debris is ballistic. This characteristic can be used to reduce the number of debris when shields are mounted in front of substrate. The flow of jets through installed shields is complicated by the interaction between shields and jets, and between shields and shock waves. We investigate influence of shield position on the shock waves and the jets by numerical calculations. Axisymmetric two-dimensional compressible Euler equations were solved using the finite volume method by using ANSYS Fluent 14.0.0 code. The shields with slit was mounted parallel to the direction of initially injected jets. In order to investigate the influence of shield position on the shock waves and the jets, the shield position and background gas pressure were adopted as parameters. The jets and shock wave are deflected by collision and they can pass through the slit of shields. The passed shock wave reflects at the substrate mounted behind the slits and it forces back the jet to decrease the jet velocity. The shield position governs the velocity and amount of the jet that reach the substrate.
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Lasing in organic mixed-crystal thin films with cavities composed of naturally formed cracks 査読あり
Mantoku Masaaki, Ichida Masao, Umezu Ikurou, Sugimura Akira, Aoki-Matsumoto Tamao
OPTICS LETTERS 42 ( 8 ) 1528 - 1531 2017年4月
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e-beam irradiation effects on IR absorption bands in single-walled carbon nanotubes 査読あり
Ichida Masao, Nagao Katsunori, Ikemoto Yuka, Okazaki Toshiya, Miyata Yasumitsu, Kawakami Akira, Kataura Hiromichi, Umezu Ikurou, Ando Hiroaki
SOLID STATE COMMUNICATIONS 250 119 - 122 2017年1月
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Hierarchical Structure of TiO2 Nano-Aggregates Prepared by Pulsed Laser Ablation in Background Gas 査読あり
Umezu Ikurou, Yoshida Takehito
ELECTRONICS AND COMMUNICATIONS IN JAPAN 99 ( 10 ) 40 - 45 2016年10月
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Pulsed-laser-deposited TiO2 nanocrystalline films supporting Au nanoparticles for visible-light-operating plasmonic photocatalysts
Yoshida Takehito, Watanabe Tei, Kikuchi Fumito, Tabuchi Takeru, Umezu Ikurou, Haraguchi Masanobu
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING 122 ( 5 ) 2016年5月
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Dynamics of colliding laser ablation plumes in background gas 査読あり
Umezu Ikurou, Hashiguchi Yusuke, Fukuoka Hiroshi, Sakamoto Naomichi, Aoki Tamao, Sugimura Akira
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING 122 ( 4 ) 2016年4月
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Pulsed-laser-deposited TiO2 nanocrystalline films supporting Au nanoparticles for visible-light-operating plasmonic photocatalysts 査読あり
Yoshida, T., Watanabe, T., Kikuchi, F., Tabuchi, T., Haraguchi, M.
Applied Physics A 122 ( 5 ) 37 2016年
共著
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Pulsed laser irradiation-induced microstructures in the Mn ion implanted Si 査読あり
Naito Muneyuki, Yamada Ryo, Machida Nobuya, Koshiba Yusuke, Sugimura Akira, Aoki Tamao, Umezu Ikurou
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS 365 110 - 113 2015年12月
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Crossover from Efros-Shklovskii variable range hopping to nearest-neighbor hopping in silicon nanocrystal random network 査読あり
Inada Mitsuru, Yamamoto Hiroshi, Gibo Manabu, Ueda Rieko, Umezu Ikurou, Tanaka Shukichi, Saitoh Tadashi, Sugimura Akira
APPLIED PHYSICS EXPRESS 8 ( 10 ) 2015年10月
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Correlation between crystallinity and mid-infrared optical absorption spectra of silicon supersaturated with sulfur 査読あり
Katsuki Nagao, Tatsuya Nakai, Muneyuki Naito, Mitsuru Inada, Tadashi Saitoh, Tamao Aoki and Akira Sugimura
MRS Proceedings 1738 mrsf14–1738–v14–05 2015年
共著
担当区分：筆頭著者
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ガス中パルスレーザアブレーションで作製された TiO2 ナノ粒子凝集体の階層構造 査読あり
吉田 岳人
電気学会論文誌 C(電子・情報・システム部門誌) 135 ( 9 ) 1055 2015年
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担当区分：筆頭著者
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Hyperdoping of silicon with deep-level impurities by pulsed YAG laser melting
Umezu Ikurou, Naito Muneyuki, Kawabe Daisuke, Koshiba Yusuke, Nagao Katsuki, Sugimura Akira, Aoki Tamao, Inada Mitsuru, Saitoh Tadashi, Kohno Atsushi
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING 117 ( 1 ) 155 - 159 2014年10月