%AChen, Guanghao%AZhou, Junxiao%ABopp, Steven%AZhao, Junxiang%ALiu, Zhaowei%BJournal Name: Optics Letters; Journal Volume: 47; Journal Issue: 16; Related Information: CHORUS Timestamp: 2022-08-08 11:30:50 %D2022%IOptical Society of America; None %JJournal Name: Optics Letters; Journal Volume: 47; Journal Issue: 16; Related Information: CHORUS Timestamp: 2022-08-08 11:30:50 %K %MOSTI ID: 10369584 %PMedium: X %TVisible and near-infrared dual band switchable metasurface edge imaging %X

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 Sb2S3metasurfaces allow low cross talk edge imaging of a target without complicated optomechanics.

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