研究等業績 - 原著論文 - 河村 希典
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Driving Liquid Crystal Lens without LC Molecular Orientation Defects Induced by an Electric Field
Marenori Kawamura, M. R. Rasidi, Yuki Ishimura
Optical Review 295 - 303 2021年04月 [査読有り]
研究論文（学術雑誌） 単著
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Liquid crystal lens with tunable conical lens properties
Marenori KAWAMURA, Yuki Ichimura and Tomoki Sugawara
Japanese Journal of Applied Physics 60 042001-1 - 042001-6 2021年03月 [査読有り]
研究論文（学術雑誌） 国内共著
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Electrically tunable liquid-crystal optical and imaging devices operating in the infrared wavelength range of 10 μm band
Marenori Kawamura, Shogo Sato, and Susumu Sato
Japanese Journal of Applied Physics 58 086502-1 - 086502-8 2019年08月 [査読有り]
研究論文（学術雑誌） 単著
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Tunable Liquid Crystal Lenses and Their Applications
Marenori Kawamura
Photopolymer Science and Technology 32 ( 4 ) 559 - 562 2019年07月 [査読有り] [招待有り]
研究論文（学術雑誌） 単著
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Kawamura M.
Japanese Journal of Applied Physics ( Japanese Journal of Applied Physics ) 58 ( 8 ) 2019年 [査読有り]
研究論文（学術雑誌） 国内共著
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Tunable liquid crystal lenses and their applications
Kawamura M.
Journal of Photopolymer Science and Technology ( Journal of Photopolymer Science and Technology ) 32 ( 4 ) 559 - 562 2019年 [査読有り] [招待有り]
研究論文（学術雑誌） 単著
<p>Liquid crystal (LC) lens with transparent multiple ring electrodes and circular electrode inside is proposed for controlling spherical and conical lens-like optical phase retardations. Almost circular interference fringes can be smoothly tuned by adjusting the voltage applied across each patterned-electrode and the common flat electrode. The spherical and conical lens-like properties can be obtained, and the focal lengths at an optical axis can also be estimated by a ray tracing calculation resulting from the experimental phase retardation distribution.</p>
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東北・北海道支部「サイエンスカフェ in Akita」開催報告
淀川 信一, 河村 希典, 和合谷 繁満, 丸山 耕一, 倉林 徹
表面と真空 ( 公益社団法人 日本表面真空学会 ) 62 ( 4 ) 231 - 232 2019年 [査読有り]
研究論文（学術雑誌） 国内共著
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Kawamura M.
Japanese Journal of Applied Physics ( Japanese Journal of Applied Physics ) 57 ( 5 ) 2018年05月 [査読有り]
研究論文（学術雑誌） 国内共著
The variable range of lens power of a liquid-crystal (LC) lens driven by two voltages is discussed on the basis of calculated and experimental results. The LC lens has two electrodes, which are a circularly hole-patterned electrode and a circular electrode, in addition to a common electrode, and highly resistive transparent films. The variable range of lens power increases with increasing driving voltage applied across the circularly hole-patterned electrode and the common electrode, and with decreasing diameter of highly resistive films. However, the optical-phase retardation profile tends to deviate from a parabolic curve in these cases. As a method to improve the trade-off properties, the highly resistive film is divided into two regions with different diameters, where the sheet resistance of an outer film is larger than that of an inner one. The improved LC lens has a lens power that varies in a wide range, and it exhibits a good parabolic phase retardation profile.
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Variable wide range of lens power and its improvement in a liquid-crystal lens using highly resistive films divided into two regions with different diameters
Marenori Kawamura and Susumu Sato
Japanese Journal of Applied Physics 57 ( 5 ) 2018年04月
研究論文（学術雑誌） 国内共著
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Feature Extraction from Multiply Focal Images by Using a Liquid Crystal Lens
M. Kawamura, S. Ishikuro
Molecular Crystals and Liquid Crystals 613 51 - 58 2015年07月 [査読有り]
研究論文（学術雑誌） 国内共著
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Liquid-Crystal Micro-Lens Array with Square-Shaped Electrodes
M. Kawamura, K. Nakamura, S. Sato
Molecular Crystals and Liquid Crystals 613 137 - 142 2015年07月 [査読有り]
研究論文（学術雑誌） 国内共著
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ディスプレイ用途を超える液晶の利用の可能性
河村希典
応用物理 84 ( 2 ) 131 - 136 2015年02月 [査読有り] [招待有り]
研究論文（学術雑誌） 単著
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3D Microscope System by Using a Liquid Crystal Lens
M. Kawamura, E. Yumoto, S. Ishikuro
International Journal of Optomechatronics Vol.7 149 - 159 2013年01月 [査読有り]
研究論文（学術雑誌） 国内共著
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Liquid-crystal micro-lens array with two-divided and tetragonally hole-patterned electrodes
M. Kawamura, K. Nakamura, S. Sato
Optics Express Vol.21 ( 22 ) 26520 - 26526 2013年01月 [査読有り]
研究論文（学術雑誌） 国内共著
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Elliptical Light Distribution Control by Using Liquid Crystal Device
M. Kawamura, H. Goto
International Journal of Optomechatronics 5 15 - 29 2011年01月 [査読有り]
研究論文（学術雑誌） 国内共著
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Liquid crystal device with a variable focal length by using two different ring electrodes
M. Kawamura, Y. Ito
The institute of Electrical Engineers of Japan 131 ( 1 ) 53 - 58 2011年01月 [査読有り]
研究論文（学術雑誌） 国内共著
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Liquid Crystal Lens with Double Circularly Hole-Patterned Electrodes
M. Kawamura and Y. Ito
Molecular Crystals and Liquid Crystals Vol.542 176/[698] - 181/[703] 2011年01月 [査読有り]
研究論文（学術雑誌） 国内共著
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Shape Measurements by Using a Liquid Crystal Lens
M. Kawamura and K. Toshima
Molecular Crystals and Liquid Crystals Vol.542 190/[712] - 195/[717] 2011年01月 [査読有り]
研究論文（学術雑誌） 国内共著
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Improvement of Negative Lens Property of Liquid Crystal Device
M. Kawamura, H. Goto, and E. Yumoto
Japanese Journal of Applied Physics 49 ( 11 ) 118002-1 - 118002-2 2010年01月 [査読有り]
研究論文（学術雑誌） 国内共著
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焦点可変およびビーム偏向機能を有する液晶レンズの電気光学特性と応用技術開発
河村希典
光技術コンタクト誌 47 ( 9 ) 496 - 502 2009年01月 [招待有り]
研究論文（学術雑誌） 国内共著