Phase-change periodic surface structures for engineering of excitonic photoluminescence in WS2 monolayers

Due to their two-dimensional nature, transition metal dichalcogenide monolayers exhibit extremely strong sensitivity of their excitonic response to the permittivity of the surrounding medium. Here, we show that the intensity and wavelength of their excitonic photoluminescence can be spatially modulated by periodic structures induced by laser pulses in phase change material films.