Chalcogenide Metasurfaces Enabling Ultra-Wideband Detectors From Visible to Mid-infrared.

Thermoelectric materials can be designed to support optical resonances across multiple spectral ranges to enable ultra-wideband photodetection. For instance, antimony telluride (SbTe) chalcogenide exhibits interband plasmonic resonances in the visible range and Mie resonances in the mid-infrared (mid-IR) range, while simultaneously possessing large thermoelectric Seebeck coefficients of 178 µV K. However, chalcogenide metasurfaces for achieving miniaturized and wavelength-sensitive ultra-wideband detectors have not been explored so far, especially with a single material platform.