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1,011 results on '"Amemiya, Tomohiro"'

337. Leg-jack

Author

Kaneko, Hirofumi, primary, Amemiya, Tomohiro, additional, Yem, Vibol, additional, Ikei, Yasushi, additional, Hirota, Koichi, additional, and Kitazaki, Michiteru, additional

Published
2018
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338. Optical and Magnetic Microstructures in YIG Ferrite Fabricated by Femtosecond Laser

Author

Ishikawa, Atsushi, Amemiya, Tomohiro, Shoji, Yuya, PHAM, NAM HAI, Pham, Namhai, Tanaka, Masaaki, MIZUMOTO, Tetsuya, ARAI, SHIGEHISA, and Tanaka, Takuo

Subjects
Kerr effect, Materials science, business.industry, Yttrium iron garnet, Physics::Optics, Coercivity, Laser, Industrial and Manufacturing Engineering, law.invention, Magnetization, chemistry.chemical_compound, Optics, chemistry, law, Femtosecond, Ferrite (magnet), Electrical and Electronic Engineering, business, Instrumentation, Refractive index
Abstract

Optical and magnetic microstructures are directly fabricated inside a film of cerium-substituted yttrium iron garnet (Ce:YIG) by using a direct femtosecond laser writing. The laser irradiation induces local changes in both optical and magnetic properties of Ce:YIG. A quantitative phase imaging technique proves that the refractive index is increased by 0.015 ± 0.001, which is about 0.7% of Ce:YIG refrative index 2.2 at 632.8 nm. The magneto-optical polar Kerr effect measurement shows that the magnetization property is changed from hard to soft, decreasing the coercivity. Our proposed technique paves the way toward the development of novel three-dimensional magneto-optical devices for optical communication and photonic applications.

Published
2015

340. Lateral confinement enhanced membrane laser on Si with a buried-ridge-waveguide structure

Author

Takahashi, Naoki, Fang, Weicheng, Ohiso, Yoshitaka, Amemiya, Tomohiro, and Nishiyama, Nobuhiko

Abstract

The energy consumption of light sources must be reduced to realize on-chip optical interconnects. This study proposes a buried-ridge-waveguide (BRW) structure to enhance the lateral optical confinement. An increase in the lateral optical confinement induces the reduction in the threshold current, and it also provides a differential resistance due to a reduction in the distance between the electrode and active region. The stripe width and ridge height are designed considering the internal loss and differential resistance. A comparison between the BRW and conventional flat structures demonstrates a 20% and 35% reduction in the threshold current and differential resistance, respectively.

Published
2021

341. InP membrane integrated photonics research.

Author

Jiao, Yuqing, Nishiyama, Nobuhiko, van der Tol, Jos, van Engelen, Jorn, Pogoretskiy, Vadim, Reniers, Sander, Kashi, Amir Abbas, Wang, Yi, Calzadilla, Victor Dolores, Spiegelberg, Marc, Cao, Zizheng, Williams, Kevin, Amemiya, Tomohiro, and Arai, Shigehisa

Subjects
PASSIVE components, PHOTONICS, ENERGY density, GAS separation membranes, TECHNOLOGY convergence
Abstract

Recently a novel photonic integration technology, based on a thin InP-based membrane, is emerging. This technology offers monolithic integration of active and passive functions in a sub-micron thick membrane. The enhanced optical confinement in the membrane results in ultracompact active and passive devices. The membrane also enables approaches to converge with electronics. It has shown high potential in breaking the speed, energy and density bottlenecks in conventional photonic integration technologies. This paper explains the concept of the InP membrane, discusses the versatility of various technology approaches and reviews the recent advancement in this field. [ABSTRACT FROM AUTHOR]

Published
2021
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