Journal
CHINESE OPTICS LETTERS
Volume 18, Issue 9, Pages -Publisher
OSA-OPTICAL SOC
DOI: 10.3788/COL202018.093501
Keywords
liquid crystal; polarization gratings; optical edge detection
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Funding
- National Natural Science Foundation of China [61704053]
- Natural Science Foundation of Hunan Province [2017JJ3032]
- Fundamental Research Funds for the Central Universities of China
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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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