In the field of nanophotonics, nanostructures for active tuning of optical phase has emerged as a versatile platform fornovel types of spatial light modulators, integrated optical devices, and ultrahigh resolution display pixels. Tuning ofoptical wavefronts with phase change materials (PCMs) such as Ge_2Sb_2Te_5 can manipulate an actively-tuned artificialwavefront 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 achievedwith active platform by adopting PCMs into optical nanostructures. The presentation will also introduce some plasmonicapplications such as optical switches and directional launchers, which can be operated by phase change of Ge_2Sb_2Te_5.
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