Zobrazeno 1 - 10
of 303
pro vyhledávání: '"Ashida, Masaaki"'
Helices and spirals, prevalent across various systems, play a crucial role in characterizing symmetry, describing dynamics, and imparting unique functionalities, attributed to their inherent simplicity and chiral nature. A helical excitation on a qua
Externí odkaz:
http://arxiv.org/abs/2402.16411
Autor:
Minowa, Yosuke, Kato, Keisuke, Ueno, Shoki, Penny, Thomas W., Pontin, Antonio, Ashida, Masaaki, Barker, Peter F.
Publikováno v:
Review of Scientific Instruments 93, 075109 (2022)
Imaging-based detection of the motion of the levitated nanoparticles complements a widely-used interferometric detection method, providing a precise and robust way to estimate the position of the particle. Here, we show the camera-based feedback cool
Externí odkaz:
http://arxiv.org/abs/2204.05506
Autor:
Minowa, Yosuke, Aoyagi, Shota, Inui, Sosuke, Nakagawa, Tomo, Asaka, Gamu, Tsubota, Makoto, Ashida, Masaaki
Publikováno v:
Science Advances, 8, eabn1143 (2022)
Impurity injection into superfluid helium is a simple yet unique method with diverse applications, including high-precision spectroscopy, quantum computing, nano/micro materialsynthesis, and flow visualisation. Quantised vortices are believed to play
Externí odkaz:
http://arxiv.org/abs/2107.04826
Autor:
Minowa, Yosuke, Geng, Xi, Kokado, Keisuke, Sato, Kentaro, Kameyama, Tatsuya, Torimoto, Tsukasa, Ashida, Masaaki
Publikováno v:
Optica 9, 139-144 (2022)
Optical tweezers, the three-dimensional confinement of a nanoparticle by a strongly focused beam of light, have been widely employed in investigating biomaterial nanomechanics, nanoscopic fluid properties, and ultrasensitive detections in various env
Externí odkaz:
http://arxiv.org/abs/2105.11631
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Autor:
Nagai, Masaya, Furutani, Yuto, Takehara, Hikaru, Ashida, Masaaki, Okuyama, Yuji, Kani, Yukimune
Publikováno v:
In Journal of Luminescence August 2023 260
Autor:
Timmerman, Dolf, Mitchell, Brandon, Ichikawa, Shuhei, Tatebayashi, Jun, Ashida, Masaaki, Fujiwara, Yasufumi
Publikováno v:
Phys. Rev. Applied 13, 014044 (2020)
The excitation efficiency and external luminescence quantum efficiency of trivalent Eu3+ ions doped into gallium nitride (GaN) was studied under optical and electrical excitation. For small pump fluences it was found that the excitation of Eu3+ ions
Externí odkaz:
http://arxiv.org/abs/1909.01538
Autor:
Makino, Yuto, Yoshikawa, Taro, Tsurui, Akihiko, Liu, Ming, Yamagishi, Gaku, Nishikawa, Masahiro, Mahiko, Tomoaki, Ohno, Mitsuru, Ashida, Masaaki, Okuyama, Naoto
Publikováno v:
In Diamond & Related Materials December 2022 130
ZnO microspheres fabricated via laser ablation in superfluid helium were found to have bubble-like voids. Even a microsphere demonstrating clear whispering gallery mode resonances in the luminescence had voids. Our analysis confirmed that the voids a
Externí odkaz:
http://arxiv.org/abs/1703.01178
We demonstrated the tuning of whispering gallery modes (WGMs) of a silica microsphere during optical levitation through the annealing process. We determined the annealing temperature from the power balance between the CO2 laser light heating and seve
Externí odkaz:
http://arxiv.org/abs/1701.00106