Controlling exciton distribution in WS2 monolayer on a photonic crystal

Abstract

Transition metal dichalcogenides monolayers are promising candidates for novel optoelectronic devices because they exhibit a unique combination of atomic-scale thickness, direct band gap, high quantum yield and ease of integration properties, which make them intriguing for fundamental studies and applications. In this work, we manipulate the exciton distribution in the WS2 monolayer integrated with a photonic crystal at room temperature. By coupling with the optical modes of the photonic crystal, the excitons can distribute along a particular direction by around ∼10 μm. More importantly, the excitons distribute along the particular direction with locked linear polarization, the degree of polarization up to 60%. Our results pave the way to manipulate the polarization distribution and exciton distribution in the WS2 monolayer.