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Crystals 2017, 7(3), 79; doi:10.3390/cryst7030079

Ferroelectric Liquid Crystal Dammann Grating by Patterned Photoalignment

1
Key Laboratory for Micro-/Nano-Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha 410082, China
2
State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
3
Physics Department, East China University of Science and Technology, Shanghai 200237, China
4
Partner State Key Laboratory (PSKL) on Advanced Displays and Optoelectronics Technologies, Department of Electronic and Computer Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
*
Author to whom correspondence should be addressed.
Academic Editors: Charles Rosenblatt and Helmut Cölfen
Received: 20 December 2016 / Accepted: 3 March 2017 / Published: 6 March 2017
(This article belongs to the Special Issue Micro and Nano Patterned Substrates for Liquid Crystal Alignment)
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Abstract

In this article, a ferroelectric liquid crystal (FLC) dammann grating (DG) is demonstrated based on the patterned photoalignment technology. By applying low electric field (10 V) on the FLC DG, the grating can switch between a diffractive state with 7 × 7 optical spots array and a non-diffractive state, depending on the polarity of electric field. The FLC DG shows very fast switching speed with switching on time and off time to be only 81 μs and 59 μs respectively. Comparing with other fast LC DGs such as the ones based on blue phase LC or dual-frequency LC, the switching speed of the proposed FLC DG is about one order faster, which provides great potential and perspective for the FLC DG to be applied in a broad range of optical applications such as optical communication and beam shaping. View Full-Text
Keywords: ferroelectric liquid crystal; patterned photoalignment; dammann grating ferroelectric liquid crystal; patterned photoalignment; dammann grating
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Fan, F.; Yao, L.; Wang, X.; Shi, L.; Srivastava, A.K.; Chigrinov, V.G.; Kwok, H.-S.; Wen, S. Ferroelectric Liquid Crystal Dammann Grating by Patterned Photoalignment. Crystals 2017, 7, 79.

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