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  • Received: May. 19, 2020

    Accepted: Jun. 3, 2020

    Posted: Jun. 30, 2020

    Published Online: Jul. 2, 2020

    The Author Email: Qi Guo (qguo@buaa.edu.cn), Xiaoqian Wang (xqwang@ecust.edu.cn)

    DOI: 10.3788/COL202018.080002

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    Qi Guo, Tian Liu, Xiaoqian Wang, Zhigang Zheng, Aleksey Kudreyko, Huijie Zhao, V. Chigrinov, Hoi-Sing Kwok. Ferroelectric liquid crystals for fast switchable circular Dammann grating [Invited][J]. Chinese Optics Letters, 2020, 18(8): 080002

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Chinese Optics Letters, Vol. 18, Issue 8, 080002 (2020)

Ferroelectric liquid crystals for fast switchable circular Dammann grating [Invited]

Qi Guo1,2,*, Tian Liu1,2, Xiaoqian Wang3,**, Zhigang Zheng3, Aleksey Kudreyko4, Huijie Zhao1,2, V. Chigrinov5,6,7, and Hoi-Sing Kwok6

Author Affiliations

  • 1School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100191, China
  • 2Beihang University Qingdao Research Institute, Qingdao 266101, China
  • 3Physics Department, East China University of Science and Technology, Shanghai 200237, China
  • 4Department of Medical Physics and Informatics, Bashkir State Medical University, Ufa 450008, Russia
  • 5School of Physics and Optoelectronic Engineering, Foshan University, Foshan 528000, China
  • 6State Key Laboratory on Advanced Displays and Optoelectronics Technologies, The Hong Kong University of Science and Technology, Hong Kong 999077, China
  • 7Department of Theoretical Physics, Moscow Region State University, Mytishi 141014, Russia

Abstract

Diffractive optical elements attract a considerable amount of attention, mainly due to their potential applications in imaging coding, optical sensing, etc. Application of ferroelectric liquid crystals (FLCs) with photo-alignment technology in diffractive optical elements results in a high efficiency and a fast response time. In this study we demonstrate a circular Dammann grating (CDG) with a diffraction efficiency of 84.5%. The achieved response time of 64 μs is approximately two orders of magnitude faster than the existing response time of nematic liquid crystal devices. By applying a low electric field (V = 6 V) to the FLC CDG, it is switched between the eight-order diffractive state and the transmissive diffraction-free state.

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