Directivity Modulation of Monolayer WS2 Emission by Single Hydrogenated Amorphous Silicon Nanospheres

Abstract

Monolayer WS2 emission is limited by its poor emission directivity. We introduce single hydrogenated amorphous silicon nanospheres (a-Si:H NSs) to realize on-demand directivity modulation. We demonstrate the active control of forward-to-backward modulation ratio via tuning the radius of a-Si:H NSs.