Abstract

Optical edge detection at the visible and near infrared (VNIR) wavelengths is deployed widely in many areas. Here we demonstrate numerically transmissive VNIR dual band edge imaging with a switchable metasurface. Tunability is enabled by using a low-loss and reversible phase-change material Sb₂S₃. The metasurface acts simultaneously as a high-pass spatial filter and a tunable spectral filter, giving the system the freedom to switch between two functions. In Function 1 with amorphous Sb₂S₃, this metasurface operates in the edge detection mode near 575 nm and blocks near infrared (NIR) transmission. In Function 2 with crystalline Sb₂S₃, the device images edges near 825 nm and blocks visible light images. The switchable Sb₂S₃ metasurfaces allow low cross talk edge imaging of a target without complicated optomechanics.

© 2022 Optica Publishing Group

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