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Optical edge detection with adjustable resolution using the planar liquid crystal Alvarez lens.
Optics Letters
|April 1, 2025
Summary
This study introduces an optical edge detection method using a liquid crystal Alvarez lens (LCAL) for adjustable resolution. The LCAL enables precise edge width control across a broad spectrum without mechanical adjustments.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Traditional edge detection methods often lack adjustable resolution or require complex mechanical components.
- Liquid crystal devices offer tunable optical properties for advanced imaging applications.
Purpose of the Study:
- To develop a novel optical edge detection technique with dynamically adjustable resolution.
- To demonstrate the capability of a planar liquid crystal Alvarez lens (LCAL) for high-performance edge detection.
Main Methods:
- Fabrication of a planar liquid crystal Alvarez lens (LCAL) using laser direct writing.
- Utilizing the tunable focal length of the LCAL to control polarization states of light.
- Implementing adjustable resolution edge detection by manipulating light polarization angles.
Main Results:
- Achieved adjustable edge width detection ranging from 32.5 μm to 73.7 μm.
- Demonstrated rotation-free and axial displacement-free resolution control.
- Confirmed broadband spectral range capability for comprehensive edge detection.
Conclusions:
- The proposed LCAL-based edge detection offers a compact and versatile solution.
- This method has potential applications in advanced optical devices like microscopes and smart cameras.
