Hybrid Plasmonic-GeTe Active Metasurfaces with High Tunability

Abstract

A novel hybrid plasmonic-germanium telluride (GeTe) metasurface design, which demonstrates single-peak on/off tunability across a spectral range of 2.5–7.5 μm is developed. Unlike previous metasurface designs utilizing GeTe layers as spacers, this study integrates GeTe as part of the meta-atoms with gold (Au), significantly reducing the amount of GeTe required while achieving substantial on/off contrast. By varying the sizes of the meta-atoms, different resonant wavelengths are achieved. This work represents a significant advancement in chalcogenide-based active metasurfaces, providing precise and dynamic control over thermal emission properties.