Plasmonic tuning of dark-exciton radiation dynamics and far-field emission directionality in monolayer WSe₂.

ABSTRACT: Manipulation of excitonic emission properties is important for numerous photonic applications. Of particular interest are developing easy-to-implement yet effective approaches for controlling the radiation dynamics and directionality of spin-forbidden dark excitons (X_D) in two-dimensional semiconductors. Here, we investigate the spectral, temporal, and directional characteristics of room-temperature X_D emission from a tungsten diselenide monolayer coupled to a dissipative plasmonic nanocavity. Under resonant plasmon-exciton coupling, the radiative decay rate of X_D is accelerated by nearly four orders of magnitude, and correspondingly, the X_D lifetime is shortened to a subnanosecond level, making it comparable to that of bright excitons. Fitting t

SUBMITTER: Jin S 

PROVIDER: S-EPMC12810645 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature