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
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Optical Trap for Manipulating Plural Particles by Using a Liquid Crystal Device
M. Kawamura, Hiroyuki Umeda and S. Sato
Molecular Crystals and Liquid crystals 510 191[1325] - 196[1330] 2009年01月 [査読有り]
研究論文(学術雑誌) 国内共著
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Transient Properties of a Liquid Crystal Optical Device with an Anamorphic Lens Property
M. Kawamura, M. Ye and S. Sato
Molecular Crystals and Liquid crystals 510 182[1316] - 190[1324] 2009年01月 [査読有り]
研究論文(学術雑誌) 国内共著
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Cell parameter measurement system of a liquid crystal cell by using a telecentric lens
M. Kawamura, T. Sano and S. Sato
Journal of the Society for Information Display 17 833 - 839 2009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 Microlens Driven by Two Voltages
M. Ye, T. Sakamoto, M. Kawamura, R. Yamaguchi and S. Sato
Molecular Crystals and Liquid Crystals 478 31 - 35 2008年01月 [査読有り]
研究論文(学術雑誌) 国内共著
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Numerical and Experimental Studies of Liquid Crystal Lens with Stacked Structure of Two Liquid Crystal Layers
B. Wang, M. Ye, M. Kawamura, R, Yamaguchi, S. Sato
Molecular Crystals and Liquid Crystals 478 36 - 43 2008年01月 [査読有り]
研究論文(学術雑誌) 国内共著
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Transient Properties during Positive-negative Switching of Liquid Crystal Lens
M. Ye, M. Wang, Y. Sato, M. Kawamura, R. Yamaguchi and S. Sato
Molecular Crystals and Liquid Crystals 478 44 - 48 2008年01月 [査読有り]
研究論文(学術雑誌) 国内共著
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Optical particle manipulation using an LC device with eight-divided circularly hole-patterned electrodes
M. Kawamura, M. Ye and S. Sato
Optics Express 16 10059 - 10065 2008年01月 [査読有り]
研究論文(学術雑誌) 国内共著
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Transient Properties of a Liquid Crystal Optical Device with an Elliptical Intensity Distribution
M. Kawamura, M. Ye and S. Sato
Japanese Journal of Applied Physics 47 6404 - 6406 2008年01月 [査読有り]
研究論文(学術雑誌) 国内共著
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Laser manipulator for rotating microscopic trapped particles by using liquid crystal optical devices
M. Kawamura, M. Ye and S. Sato
Molecular Crystals and Liquid Crystals 488 238 - 245 2008年01月 [査読有り]
研究論文(学術雑誌) 国内共著
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A High-Speed Measurement Method for Reflective Liquid Crystal Cells Using a Liquid Crystal Polarization-Converting
M. Kawamura and S. Sato
DeviceIEEE/OSA Journal of Display Technology 3 22 - 28 2007年01月 [査読有り]
研究論文(学術雑誌) 国内共著
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Optical tweezers system by using a liquid crystal optical device
M. Kawamura, M. Ye and S. Sato:
Molecular Crystals and Liquid Crystals 478 31 - 35 2007年01月 [査読有り]
研究論文(学術雑誌) 国内共著
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Fast switching between negative and positive power of liquid crystal lens
M. Ye, B. Wang, M. Kawamura, S. Sato
Electronics Letters 43 474 - 475 2007年01月 [査読有り]
研究論文(学術雑誌) 国内共著
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Image Formation Using Liquid Crystal Lens
M. Ye, M. Wang, M. Kawamura, R. Yamaguchi and S. Sato
Japanese Journal of Applied Physics 46 ( 10 ) 6776 - 6777 2007年01月 [査読有り]
研究論文(学術雑誌) 国内共著
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Optical Trapping and Manipulation System by Using a Liquid Crystal Lens with Focusing and Deflection Properties
M. Kawamura, M. Ye and S. Sato
Japanese Journal of Applied Physics 44 6098 - 6100 2005年01月 [査読有り]
研究論文(学術雑誌) 国内共著
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A Two-Dimensional Pretilt Angle Distribution Measurement of Twisted Nematic Liquid Crystal Cells Using Stokes Parameters at Plural Wavelengths
M. Kawamura and S. Sato
Japanese Journal of Applied Physics 43 709 - 714 2004年01月 [査読有り]
研究論文(学術雑誌) 国内共著
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Two-dimensional measurements of cell parameter distributions in reflective liquid crystal displays by using multiple wavelengths Stokes parameters
M. Kawamura, Y. Goto and S. Sato
Journal of Applied physics 95 4371 - 4375 2004年01月 [査読有り]
研究論文(学術雑誌) 国内共著
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Determinaion of Anchoring Energy in nematic Liquid Crystal Cells with Controllable Twist Angles Using a Stokes Parameter Method
M. Kawamura, Y. Goto and S. Sato
Japanese Journal of Applied Physics 43 6239 - 6242 2004年01月 [査読有り]
研究論文(学術雑誌) 国内共著
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A Two-Dimensional Pretilt Angle Distribution Measurement of Twisted Nematic Liquid Crystal Cells Using Stokes Parameters at Plural Wavelengths
M. Kawamura and S. Sato
Japanese Journal of Applied Physics 95 4371 - 4375 2004年01月 [査読有り]
研究論文(学術雑誌) 国内共著
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Determinaion of Anchoring Energy in nematic Liquid Crystal Cells with Controllable Twist Angles Using a Stokes Parameter Method
M. Kawamura, Y. Goto and S. Sato
Japanese Journal of Applied Physics 43 6239 - 6242 2004年01月 [査読有り]
研究論文(学術雑誌) 国内共著
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A Two-Dimensional Pretilt Angle Distribution Measurement of Twisted Nematic Liquid Crystal Cells by Using Stokes Parameters at Plural Wavelengths
M. Kawamura, Y. Goto and S. Sato
Japanese Journal of Applied Physics 43 709 - 714 2004年01月 [査読有り]
研究論文(学術雑誌) 国内共著
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Measurements of Cell thickness Distributions in Reflective Liquid Crystal Cells Using a Two-Dimensional Stokes Parameter Method
M. Kawamura and S. Sato
Japanese Journal of Applied Physics 40 621 - 624 2001年01月 [査読有り]
研究論文(学術雑誌) 国内共著
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Measurements of Cell Parameters in Reflective Liquid Crystal Cells by Using a Stokes Parameter Method
M. Kawamura and S. Sato
Molecular Crystals and Liquid Crystals 367 763 - 770 2001年01月 [査読有り]
研究論文(学術雑誌) 国内共著
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Measurements of Cell thickness Distributions in Reflective Liquid Crystal Cells Using a Two-Dimensional Stokes Parameter Method
M. Kawamura and S. Sato
Japanese Journal of Applied Physics 40 ( 6B ) 621 - 624 2001年01月 [査読有り]
研究論文(学術雑誌) 国内共著
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Measurements of Cell Parameters in Reflective Liquid Crystal Cells by Using a Stokes Parameter Method
M. Kawamura and S. Sato
Molecular Crystals and Liquid Crystals 40 ( 6B ) 621 - 624 2001年01月 [査読有り]
研究論文(学術雑誌) 国内共著
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Humidity and Temperature Sensing by Using an Optical Fiber and a Corner Cube Prism
M. Kawamura, T. Takeuchi, H. Fuad and S. Sato
Japanese Journal of Applied Physics 38 ( 2 ) 849 - 850 1999年01月 [査読有り]
研究論文(学術雑誌) 国内共著
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Simultaneous Detection of an Electric Field and a Small Quantity of Decomposition Products by Use of Several Sensor Heads and OTDR Method
M. Kawamura and S. Sato
The Transactions of The Institute of Electrical Engineers of Japan 119-E ( 3 ) 155 - 160 1999年01月 [査読有り]
研究論文(学術雑誌) 国内共著
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Humidity and Temperature Sensing by Using an Optical Fiber and a Corner Cube Prism
M. Kawamura, T. Takeuchi, H. Fuad and S. Sato
Japanese Journal of Applied Physics 38 849 - 850 1999年01月 [査読有り]
研究論文(学術雑誌) 国内共著
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Simultaneous Detection of an Electric Field and a Small Quantity of Decomposition Products by Use of Several Sensor Heads and OTDR Method
M. Kawamura and S. Sato
The Transactions of The Institute of Electrical Engineers of Japan 119-E 155 - 160 1999年01月 [査読有り]
研究論文(学術雑誌) 国内共著
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An Optical Sensing System Using Liquid Crystal Cells and a Corner Cube Prism Coated with Dye Films for Simultaneous Detection of an Electric Field and Decomposition Products of SF<sub>6</sub>
M. Kawamura and S. Sato
Japanese Journal of Applied Physics 37 ( 10 ) 5669 - 5673 1998年01月 [査読有り]
研究論文(学術雑誌) 国内共著
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Detection of Arc-or Corona-Discharge in SF<sub>6-</sub> Insulated Equipments by Using an OTDR Method and Corner Cube Prisms Coated with Dye Films
M. Kawamura, K. Ishii and S. Sato
Sensors and Actuators B 50 ( 2 ) 140 - 144 1998年01月 [査読有り]
研究論文(学術雑誌) 国内共著
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An Optical Sensing System Using Liquid Crystal Cells and a Corner Cube Prism Coated with Dye Films for Simultaneous Detection of an Electric Field and Decomposition Products of SF<sub>6</sub>
M. Kawamura and S. Sato
Japanese Journal of Applied Physics 37 5669 - 5673 1998年01月 [査読有り]
研究論文(学術雑誌) 国内共著
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Detection of Arc-or Corona-Discharge in SF<sub>6-</sub> Insulated Equipments by Using an OTDR Method and Corner Cube Prisms Coated with Dye Films.
M. Kawamura, K. Ishii and S. Sato
Sensors and Actuators B 50 ( 2 ) 140 - 144 1998年01月 [査読有り]
研究論文(学術雑誌) 国内共著
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Sensing of Decomposition Products in SF<sub>6</sub> by Use of a Corner Cube Prism Coated with Dye Film as an Optical Sensor Head
M. Kawamura, K. Ishii and S. Sato
Japanese Journal of Applied Physics 36 ( 7 ) 4517 - 4520 1997年01月 [査読有り]
研究論文(学術雑誌) 国内共著
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Sensing of Decomposition Products in SF<sub>6</sub> by Use of a Corner Cube Prism Coated with Dye Film as an Optical Sensor Head
M. Kawamura, K. Ishii and S. Sato
Japanese Journal of Applied Physics 36 4517 - 4520 1997年01月 [査読有り]
研究論文(学術雑誌) 国内共著