Prof. Masaaki Ashida Profile

Prof. Masaaki Ashida

at Osaka Univ

SPIE Involvement:

Conference Program Committee | Author

Publications (24)

Proceedings Article | 20 September 2023 Paper

Dynamics of quantized vortices in superfluid helium visualized with silicon nanoparticles

Yosuke Minowa, Yuki Yasui, Shota Aoyagi, Masaaki Ashida

Proceedings Volume 12606, 1260603 (2023) https://doi.org/10.1117/12.3008317

KEYWORDS: Nanoparticles, Helium, Visualization, Silicon, Laser ablation, Quantum particles, Fluid dynamics, Surface finishing, Scattered light, Light-matter interactions

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Proceedings Article | 20 September 2023 Paper

What will be done by optical manipulation of magnetically trapped superconducting micro-particles

Masaaki Ashida, Shota Sasaki, Jun Naoi, Masato Takamune, Daisei Kondo, Yuta Takahashi, Mitsutaka Kumakura, Yoshiki Moriwaki

Proceedings Volume 12606, 126060W (2023) https://doi.org/10.1117/12.3008353

KEYWORDS: Particles, Magnetism, Helium, Optical manipulation, Superconductors, Laser irradiation, Viscosity, Superconductivity, Indium, Quantum particles

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Proceedings Article | 20 September 2023 Paper

Optical properties of color centers in nanodiamonds fabricated by detonation process

Yuto Makino, Yoshiki Saito, Masaaki Ashida

Proceedings Volume 12606, 126061G (2023) https://doi.org/10.1117/12.3008384

KEYWORDS: Optical properties, Color centers, Diamond, Neodymium, Nanodiamonds, Luminescence, Nanolithography, Inhomogeneities, Spectroscopy, Silicon

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Proceedings Article | 8 December 2022 Paper

Optical trapping of silicon nanoparticles in superfluid helium

Yosuke Minowa, Yuki Yasui, Masaaki Ashida

Proceedings Volume 12479, 124790B (2022) https://doi.org/10.1117/12.2658792

KEYWORDS: Nanoparticles, Silicon, Optical tweezers, Helium, Laser ablation, Semiconductor lasers, Absorption, Particles, Optical manipulation, Infrared sensors

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Proceedings Article | 27 October 2021 Paper

Optical properties of semiconductor microspheres fabricated via laser ablation in superfluid helium

Yosuke Minowa, Tomoki Nagao, Masaaki Ashida

Proceedings Volume 11926, 1192614 (2021) https://doi.org/10.1117/12.2616171

KEYWORDS: Zinc oxide, Semiconductors, Helium, Laser ablation, Scanning electron microscopy, Optical semiconductors, Optical properties, Luminescence, Ion beams, Visible radiation

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Proceedings Article | 15 June 2020 Paper

Quantum vortex visualization in superfluid helium

Yosuke Minowa, Kensuke Kokado, Shota Aoyagi, Masaaki Ashida

Proceedings Volume 11522, 115221B (2020) https://doi.org/10.1117/12.2573515

KEYWORDS: Helium, Visualization, Nanoparticles, Laser ablation, Light scattering, Particles, Liquids, Nanolithography, Hydrogen, Solids

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Proceedings Article | 15 June 2020 Paper

Observation of Mie scattering from a superconducting micro-particle

S. Sasaki, J. Naoi, M. Takanune, D. Kondo, M. Kumakura, M. Ashida, Y. Moriwaki

Proceedings Volume 11522, 115220P (2020) https://doi.org/10.1117/12.2573783

KEYWORDS: Particles, Superconductors, Helium, Mie scattering, Indium, Optical properties, Light scattering, Spherical lenses, Magnetism, Metals

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SPIE Journal Paper | 15 May 2020

Synthesis of submicron-sized CdS particles using reverse micelles

Yosuke Minowa, Shohei Kuramoto, Tatsuya Kameyama, Tsukasa Torimoto, Masaaki Ashida

JNP, Vol. 14, Issue 02, 026013, (May 2020) https://doi.org/10.1117/12.10.1117/1.JNP.14.026013

KEYWORDS: Particles, Cadmium sulfide, Atmospheric particles, Optical tweezers, Luminescence, Quantum dots, Absorption, Semiconductors, Scanning electron microscopy, Optical manipulation

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SPIE Journal Paper | 10 March 2020

Temperature dependences of photoluminescence intensities observed from AgInGaS and AgInGaS/GaS _x core–shell nanoparticles

Masayoshi Ichimiya, Tatsuya Kameyama, Tsukasa Torimoto, Taro Uematsu, Susumu Kuwabata, Masaaki Ashida

JNP, Vol. 14, Issue 01, 016010, (March 2020) https://doi.org/10.1117/12.10.1117/1.JNP.14.016010

KEYWORDS: Nanoparticles, Luminescence, Temperature metrology, Thermal effects, Semiconductors, Solids, Compound semiconductors, Phonons, Thermal modeling, Coating

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Proceedings Article | 10 March 2020 Presentation

Thermal free ultrafast luminescence due to nonlocal light-matter interaction (Conference Presentation)

Masayoshi Ichimiya, Takuya Matsuda, Hajime Ishihara, Masaaki Ashida

Proceedings Volume 11278, 112780U (2020) https://doi.org/10.1117/12.2544760

KEYWORDS: Ultrafast phenomena, Luminescence, Light-matter interactions, Thin films, Excitons, Phonons, Scattering, Semiconductors, Optical microcavities, Zinc oxide

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Proceedings Article | 9 September 2019 Presentation

Optical manipulation of magnetically trapped superconducting micro particles in superfluid helium (Conference Presentation)

Masaaki Ashida, Jun Naoi, Masato Takamune, Yuta Takahashi, Shota Sasaki, Mitsutaka Kumakura, Yoshiuki Moriwaki

Proceedings Volume 11083, 110831G (2019) https://doi.org/10.1117/12.2529166

KEYWORDS: Particles, Superconductors, Helium, Optical manipulation, Laser ablation, Control systems, Superconductivity, Transparency, Motion controllers, Nanolithography

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Proceedings Article | 5 March 2019 Presentation

Femtosecond radiative decay of two excitons coupled via radiation-induced interaction in ZnO thin films (Conference Presentation)

Masayoshi Ichimiya, Takuya Matsuda, Takashi Kinoshita, Masaaki Nakayama, Hajime Ishihara, Masaaki Ashida

Proceedings Volume 10916, 109160K (2019) https://doi.org/10.1117/12.2509409

KEYWORDS: Excitons, Thin films, Zinc oxide, Femtosecond phenomena, Crystals, Microresonators, Semiconductors, Wave propagation, Spectroscopy, Pulsed laser deposition

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SPIE Journal Paper | 27 February 2019 Open Access

Special Section Guest Editorial: Optical Manipulation and Structured Materials

Takashige Omatsu, Masaaki Ashida, Yoshihiko Arita

JNP, Vol. 13, Issue 01, 012501, (February 2019) https://doi.org/10.1117/12.10.1117/1.JNP.13.012501

KEYWORDS: Optical manipulation, Particles, Physics, Structured light, Optical tweezers, Diffraction, Near field optics, Plasmonics, Nanoparticles, Light-matter interactions

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SPIE Journal Paper | 17 October 2018

Single-particle photoluminescence from cadmium selenide quantum dots fabricated via laser ablation in superfluid helium

Yosuke Minowa, Tatsuro Suzuki, Kenji Setoura, Syoji Ito, Hiroshi Miyasaka, Masaaki Ashida

JNP, Vol. 13, Issue 01, 012506, (October 2018) https://doi.org/10.1117/12.10.1117/1.JNP.13.012506

KEYWORDS: Cadmium, Optical manipulation, Particles, Absorption, Luminescence, Helium, Quantum dots, Laser ablation, Nanoparticles, Nanolithography

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Proceedings Article | 24 April 2018 Paper

Fabrication of cadmium selenide quantum dots with laser ablation in superfluid helium

Yosuke Minowa, Tatsuro Suzuki, Kenji Setoura, Syoji Ito, Hiroshi Miyasaka, Masaaki Ashida

Proceedings Volume 10712, 107120N (2018) https://doi.org/10.1117/12.2319016

KEYWORDS: Helium, Quantum dots, Laser ablation, Particles, Luminescence, Cadmium, Optical manipulation, Visualization, Atmospheric particles, Single photon

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Proceedings Article | 24 April 2018 Paper

Property of magnetic trapping of superconducting sub-micron particles

J. Naoi, Y. Takahashi, M. Takamune, Y. Nakamura, M. Kumakura, M. Ashida, F. Matsushima, Y. Moriwaki

Proceedings Volume 10712, 107120K (2018) https://doi.org/10.1117/12.2316795

KEYWORDS: Particles, Magnetism, Superconductors, Laser ablation, Helium, Rhenium, Superconductivity, Temperature metrology, CCD cameras, Indium

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Proceedings Article | 25 September 2017 Presentation

Optical fabrication and trapping of superconducting nanoparticles in superfluid helium (Conference Presentation)

Masaaki Ashida, Yosuke Minowa, Mitsutaka Kumakura, Yuta Takahashi, Fusakazu Matsushima, Yoshiki Moriwaki

Proceedings Volume 10347, 103471X (2017) https://doi.org/10.1117/12.2273278

KEYWORDS: Helium, Superconductors, Laser ablation, Superconductivity, Particles, Magnetism, Liquids, Metals, Nanoparticles, Transparency

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Proceedings Article | 18 April 2017 Paper

Fabrication of semiconductor microspheres with laser ablation in superfluid helium

Yosuke Minowa, Yuya Oguni, Masaaki Ashida

Proceedings Volume 10252, 102520N (2017) https://doi.org/10.1117/12.2274888

KEYWORDS: Laser ablation, Helium, Semiconductor lasers, Semiconductors, Ion beams, Scanning electron microscopy, Zinc oxide, Electron microscopes, Crystals, Spherical lenses

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Proceedings Article | 18 April 2017 Paper

Property of magnetic trapping of superconducting sub-micron particles

Y. Takahashi, J. Naoi, K. Yamaguchi, M. Kumakura, M. Ashida, F. Matsushima, Y. Moriwaki

Proceedings Volume 10252, 102521H (2017) https://doi.org/10.1117/12.2279262

KEYWORDS: Particles, Magnetism, Superconductors, Rhenium, Laser ablation, Helium, Temperature metrology, Indium, Superconductivity, Spherical lenses

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Proceedings Article | 14 March 2015 Paper

Pulse shaping of the intense few-cycle terahertz pulses for nonlinear spectroscopy

Masaya Nagai, Yutaka Kamon, Eiichi Matsubara, Yosuke Minowa, Masaaki Ashida

Proceedings Volume 9361, 936107 (2015) https://doi.org/10.1117/12.2079005

KEYWORDS: Terahertz radiation, Spectroscopy, Picosecond phenomena, Metals, Waveguides, Pulse shaping, Phase velocity, Absorption, Ionization, Crystals

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Proceedings Article | 20 February 2014 Paper

Ultra-broadband IR and THz generation and detection with ultrashort pulses

Masaaki Ashida, Eiichi Matsubara, Ikufumi Katayama

Proceedings Volume 8964, 896409 (2014) https://doi.org/10.1117/12.2042829

KEYWORDS: Antennas, Terahertz radiation, Spectroscopy, Annealing, Infrared radiation, Mirrors, Superconductors, Terahertz spectroscopy, Crystals, Electrodes

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Proceedings Article | 29 February 2012 Paper

White-light lasing in ZnO microspheres fabricated by laser ablation

Shinya Okamoto, Yosuke Minowa, Masaaki Ashida

Proceedings Volume 8263, 82630K (2012) https://doi.org/10.1117/12.907595

KEYWORDS: Zinc oxide, Laser ablation, Helium, Visible radiation, Ultraviolet radiation, Continuous wave operation, Scanning electron microscopy, Sapphire lasers, Optical microscopes, Semiconductors

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Proceedings Article | 22 March 2007 Paper

Optical manipulation of semiconductor quantum dots in superfluid helium

Masaaki Ashida, Kazuhiro Inaba, Tadashi Itoh

Proceedings Volume 6468, 64681H (2007) https://doi.org/10.1117/12.717243

KEYWORDS: Optical manipulation, Particles, Quantum dots, Laser ablation, Helium, Silicon, Semiconductors, Scanning electron microscopy, Excitons, Optical semiconductors

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