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  • Received: Mar. 23, 2020

    Accepted: May. 9, 2020

    Posted: Jul. 20, 2020

    Published Online: Jul. 22, 2020

    The Author Email: Huihui Huang (huangh@hnu.edu.cn)

    DOI: 10.3788/COL202018.093501

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    Yang Yang, Xinyang Liu, Yan Wu, Ting Li, Fan Fan, Huihui Huang, Shuangchun Wen. Optical edge detection with adjustable resolution based on liquid crystal polarization gratings[J]. Chinese Optics Letters, 2020, 18(9): 093501

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Chinese Optics Letters, Vol. 18, Issue 9, 093501 (2020)

Optical edge detection with adjustable resolution based on liquid crystal polarization gratings

Yang Yang, Xinyang Liu, Yan Wu, Ting Li, Fan Fan, Huihui Huang*, and Shuangchun Wen

Author Affiliations

  • Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education & Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices, School of Physics and Electronics, Hunan University, Changsha 410082, China

Abstract

Optical edge detection, a part of image processing, plays an important role in extracting image information used in optical analog computation. In this Letter, we raise a new way to realize optical edge detection. This design is based on two liquid crystal polarization gratings with a period of 2.2 mm, which function as a spatial differentiator. We experimentally demonstrate broadband optical detection and real-time adjustable resolution. The proposed method takes advantage of the convenience to use, simple fabrication process, and real-time tunable resolution. It may guide more significant applications in the optical field and other practical scenarios like machine vision in computers.

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