Lin Liu, Qun Hao, Cancan Yao, Haoyue Xing, Yang Cheng
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Abstract
In this Letter, we propose an optical edge detection method with adjustable resolution using a planar liquid crystal Alvarez lens (LCAL). A planar liquid crystal Alvarez lens was fabricated by laser direct writing. When the focal length of the liquid crystal Alvarez lens changes and linearly polarized light (LP) passes through the liquid crystal Alvarez lens, the angle between the emitted left-handed circularly polarized light and right-handed circularly polarized light can be controlled, enabling adjustable resolution edge detection. The lens can adjust an edge width from 32.5 μm to 73.7 μm without requiring any rotation or axial displacement. Moreover, it can accomplish comprehensive edge detection across a broadband spectral range. This edge detection method could offer a potential application value for compact optical devices such as high-contrast microscopes and smart cameras.
期刊介绍：
The Optical Society (OSA) publishes high-quality, peer-reviewed articles in its portfolio of journals, which serve the full breadth of the optics and photonics community.
Optics Letters offers rapid dissemination of new results in all areas of optics with short, original, peer-reviewed communications. Optics Letters covers the latest research in optical science, including optical measurements, optical components and devices, atmospheric optics, biomedical optics, Fourier optics, integrated optics, optical processing, optoelectronics, lasers, nonlinear optics, optical storage and holography, optical coherence, polarization, quantum electronics, ultrafast optical phenomena, photonic crystals, and fiber optics. Criteria used in determining acceptability of contributions include newsworthiness to a substantial part of the optics community and the effect of rapid publication on the research of others. This journal, published twice each month, is where readers look for the latest discoveries in optics.
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