Liquid-Crystal Blazed Gratings with Spatially Distributed Pretilt Angle
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概要
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An electrically tunable liquid-crystal (LC) blazed grating was demonstrated by introducing a periodic pattern of pretilt angle that was controlled by adjusting the rubbing density. In the proposed LC grating, an asymmetrically varying LC molecular orientation was realized even without voltage application. The diffracted light intensity was controlled by adjusting the applied voltage, and the diffraction effect disappeared under a sufficiently high applied voltage. Asymmetric diffraction patterns were obtained and it was revealed that 0th-, 1st-, and 2nd-order diffraction beams can be switched with an appropriate applied voltage. A maximum diffraction efficiency of 0.68 for the 1st-order diffraction was experimentally obtained; however, it is much less than the theoretical limit of unity. It is likely that the difference between optical path lengths for extraordinary and ordinary rays is not linearly distributed.
- 2010-06-25
著者
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Nose Toshiaki
Department Of Electrical And Electronic Engineering Akita University
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Honma Michinori
Department Of Electrical And Electronic Engineering Akita University
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Yanase Satoshi
Akita Research Institute Of Advanced Technology Akita Prefectural R&d Center
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Susumu Sato
Akita Research Institute of Advanced Technology (AIT), Akita Prefectual R&D Center, 4-21 Sanuki, Araya, Akita 010-1623, Japan
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Rumiko Yamaguchi
Department of Electrical and Electronic Engineering, Faculty of Engineering and Resource Science, Akita University, 1-1 Tegatagakuen-cho, Akita 010-8502, Japan
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Rumiko Yamaguchi
Department of Electrical and Electronic Engineering, Akita University, Akita 010-8502, Japan
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Satoshi Yanase
Akita Research Institute of Advanced Technology (AIT), Akita Prefectual R&D Center, 4-21 Sanuki, Araya, Akita 010-1623, Japan
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Yanase Satoshi
Akita Research Institute of Advanced Technology
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Michinori Honma
Department of Electronics and Information Systems, Faculty of Systems Science and Technology, Akita Prefectural University, 84-4 Tsuchiya-Ebinokuchi, Yurihonjo, Akita 015-0055, Japan
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Yanase Satoshi
Akita Industrial Technology Center, Akita 010-1623, Japan
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