Hybrid Plasmonic‐GeTe Active Metasurfaces with High Tunability

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.