Phase-change metasurfaces for reconfigurable image processing

Abstract

Optical metasurfaces have enabled high-speed, low-power image processing within a compact footprint. However, reconfigurable imaging in such flat devices remains a critical challenge for fully harnessing their potential in practical applications. Here, we propose and demonstrate phase-change metasurfaces capable of dynamically switching between edge detection and bright-field imaging in the visible spectrum. This reconfigurability is achieved through engineering angular dispersion at electric and magnetic Mie-type resonances. The customized metasurface exhibits an angle-dependent transmittance profile in the amorphous state of Sb${}_2$S${}_3$ meta-atoms for efficient isotropic edge detection, and an angle-independent profile in the crystalline state for uniform bright-field imaging. The nanostructured Sb${}_2$S${}_3$-based reconfigurable image processing metasurfaces hold significant potential for applications in computer vision for autonomous driving systems.

References in corpus (9)

• Wide band gap phase change material tuned visible photonics
• Edge detection imaging by quasi-bound states in the continuum
• Polarization Imaging and Edge Detection with Image-Processing Metasurfaces
• Dispersion Engineered Metasurfaces for Broadband, High-NA, High-Efficiency, Dual-Polarization Analog Image Processing
• Phase-change metasurfaces for dynamic image display and information encryption
• Phase-change nonlocal metasurfaces for dynamic wavefront manipulation
• Single-sized phase-change metasurfaces for dynamic information multiplexing and encryption
• Optical computation of divergence operation for vector field
• Advanced Phase-Change Materials for Enhanced Meta-Displays

Cited by in corpus (1)

• Tunable edge and depth sensing via phase-change nonlocal metasurfaces