K
Kiyoshi Asakawa
Researcher at University of Tsukuba
Publications - 185
Citations - 3368
Kiyoshi Asakawa is an academic researcher from University of Tsukuba. The author has contributed to research in topics: Photonic crystal & Quantum dot. The author has an hindex of 29, co-authored 185 publications receiving 3253 citations. Previous affiliations of Kiyoshi Asakawa include National Institute for Materials Science & Applied Science Private University.
Papers
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Journal ArticleDOI
Ultra-fast photonic crystal/quantum dot alloptical switch for future photonic networks.
Hitoshi Nakamura,Yoshimasa Sugimoto,Kyozo Kanamoto,Naoki Ikeda,Yu Tanaka,Yusui Nakamura,Shunsuke Ohkouchi,Yoshinori Watanabe,Kuon Inoue,Hiroshi Ishikawa,Kiyoshi Asakawa +10 more
TL;DR: A novel two-dimensional photonic-crystal based Symmetric Mach Zehnder type all-optical switch with InAs quantum dots acting as a nonlinear phase-shift source with a 15-ps-wide switching-window at sufficiently low optical-energy of ~100 fJ.
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Low propagation loss of 0.76 dB/mm in GaAs-based single-line-defect two-dimensional photonic crystal slab waveguides up to 1 cm in length
TL;DR: Straight single-line-defect photonic crystal waveguides on GaAs slabs with lengths of 1, 4, and 10 mm have been fabricated by controlling the Al content of a sacrificial AlGaAs clad layer and the wet etching duration to obtain a PC core layer with a very smooth surface.
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The effect of higher-order dispersion on slow light propagation in photonic crystal waveguides.
R.J.P. Engelen,Yoshimasa Sugimoto,Yoshinori Watanabe,Jeroen P. Korterik,N. Ikeda,N.F. van Hulst,Kiyoshi Asakawa,Laurens Kuipers +7 more
TL;DR: In this paper, the dispersion of ultrafast pulses in a photonic crystal waveguide as a function of optical frequency was studied in both experiment and theory, and the effect of dispersion on the shape of the pulses was determined.
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Photonic crystal and quantum dot technologies for all-optical switch and logic device
Kiyoshi Asakawa,Yoshimasa Sugimoto,Yoshimasa Sugimoto,Yoshinori Watanabe,Nobuhiko Ozaki,A. Mizutani,Yoshiaki Takata,Yoshinori Kitagawa,Hiroshi Ishikawa,N. Ikeda,Koichi Awazu,Xiaomin Wang,Akira Watanabe,Shigeru Nakamura,Shunsuke Ohkouchi,Kuon Inoue,Martin Kristensen,Ole Sigmund,Peter Ingo Borel,Roel Baets +19 more
TL;DR: In this paper, a symmetrical Mach?Zehnder (SMZ) type, ultra-small and ultra-fast all-optical switch and logic device is presented.
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Site-controlled self-organization of individual InAs quantum dots by scanning tunneling probe-assisted nanolithography
TL;DR: In this paper, a nanometer-scale site-control technique for individual InAs quantum dots (QDs) has been developed by using scanning tunneling microscope (STM) assisted nanolithography and self-organizing molecular-beam epitaxy.