The use of chalcogenide phase change materials for optical phase control and its plasmonic applications

In the field of nanophotonics, nanostructures for active tuning of optical phase has emerged as a versatile platform for novel types of spatial light modulators, integrated optical devices, and ultrahigh resolution display pixels. Tuning of optical wavefronts with phase change materials (PCMs) such as Ge2Sb2Te5 can manipulate an actively-tuned artificial wavefront with the convergence of metasurface design technology. Various light phenomena such as perfect absorbers, beaming angle tweezers, and arbitrary phase profile generations for optical hologram applications have been achieved with active platform by adopting PCMs into optical nanostructures. The presentation will also introduce some plasmonic applications such as optical switches and directional launchers, which can be operated by phase change of Ge2Sb2Te5.