Microcavity enhanced single photon emission from two-dimensional WSe2

L. C. Flatten; L. Weng; A. Branny; S. Johnson; P. R. Dolan; A. A. P. Trichet; B. D. Gerardot; J. M. Smith

doi:10.1063/1.5026779

paper

Microcavity enhanced single photon emission from two-dimensional WSe2

arXiv:1807.02778 · doi:10.1063/1.5026779

Abstract

Atomically flat semiconducting materials such as monolayer WSe $_{2}$ hold great promise for novel optoelectronic devices. Recently, quantum light emission has been observed from bound excitons in exfoliated WSe $_{2}$ . As part of developing optoelectronic devices, the control of the radiative properties of such emitters is an important step. Here we report the coupling of a bound exciton in WSe $_{2}$ to open microcavities. We use a range of radii of curvature in the plano-concave cavity geometry with mode volumes in the $λ^{3}$ regime, giving Purcell factors of up to 8 while increasing the photon flux five-fold. Additionally we determine the quantum efficiency of the single photon emitter to be $η = 0.46 \pm 0.03$ . Our findings pave the way to cavity-enhanced monolayer based single photon sources for a wide range of applications in nanophotonics and quantum information technologies.

17 pages, 6 figures