Static and active chalcogenide based meta-optics

Chalcogenide based materials are excellent candidates for implementing static and dynamic meta-optics as they possess very high permittivities and support large modulation of optical constants through various mechanisms such as, phase-change, photon-darkening, laser writing and anomalous thermo-optic effects. We present a study of various chalcogenide compositions used for static and active metasurfaces. We start with large area CVD grown amorphous Selenium nanoparticles on various substrates and show that their Mie-resonant response spans the entire mid-infrared range. By coupling Se Mie-resonators to ENZ substrates we demonstrate an order of magnitude increase in quality factor. Next, we investigate topological insulators Bi2Te3 metasurfaces and demonstrate that these high permittivity metasurfaces can yield very large absorption resonances that are tunable in the infrared range. Finally, we demonstrate ultra-wide dynamic tuning of PbTe metasurface resonators.