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Crystals 2019, 9(2), 111; https://doi.org/10.3390/cryst9020111

A Fast-Response and Helicity-Dependent Lens Enabled by Micro-Patterned Dual-Frequency Liquid Crystals

1, 1,3, 1,3, 2,* and 1,3,*
1
Key Laboratory of Intelligent Optical Sensing and Manipulation, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China
2
Department of Chemistry, Tsinghua University, Beijing 100084, China
3
Institute for Smart Liquid Crystals, JITRI, Changshu 215500, China
*
Authors to whom correspondence should be addressed.
Received: 7 January 2019 / Revised: 6 February 2019 / Accepted: 16 February 2019 / Published: 20 February 2019
(This article belongs to the Special Issue Liquid Crystal Optics and Physics: Recent Advances and Prospects)
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Abstract

Liquid crystals are excellent candidates for tunable optical elements due to their large birefringence and continuous tunability by external fields. A dual-frequency liquid crystal lens integrated with Pancharatnam–Berry phase was fabricated via a dynamic photo-patterning technique. The proposed lens exhibited distinctive polarization-dependent characteristics and ultra-high efficiency rates of up to 95%. Via merely alternating the frequency of the applied electric field, the switching time between unfocused and focused states was measured in submilliseconds. This work supplies a new strategy for fast-response, high-efficiency and helicity-dependent lens with merits of easy fabrication and low power consumption. View Full-Text
Keywords: diffractive lens; Pancharatnam–Berry phase; dual-frequency liquid crystals; patterned photoalignment diffractive lens; Pancharatnam–Berry phase; dual-frequency liquid crystals; patterned photoalignment
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Duan, W.; Chen, P.; Ge, S.-J.; Liang, X.; Hu, W. A Fast-Response and Helicity-Dependent Lens Enabled by Micro-Patterned Dual-Frequency Liquid Crystals. Crystals 2019, 9, 111.

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