Microcavity enhanced single photon emission from two-dimensional WSe2

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 ${\lambda }^3$ 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 $\eta =0.46\pm 0.03$. 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.

arXiv comment17 pages, 6 figures

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• Two-Dimensional Material Nanophotonics
• Photonic quantum technologies
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• Large-scale quantum-emitter arrays in atomically thin semiconductors
• Single photon quantum cryptography
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• Purcell-enhanced single-photon emission from nitrogen-vacancy centers coupled to a tunable microcavity
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• Tunable cavity coupling of the zero phonon line of a nitrogen-vacancy defect in diamond
• Controlling the emission from semiconductor quantum dots using ultra-small tunable optical microcavities
• Spectral engineering of coupled open-access microcavities
• Substrate engineering for high quality emission of free and localized excitons from atomic monolayers in hybrid architectures

Cited by in corpus (12)

• Enhanced Light-Matter Interaction in Two-Dimensional Transition Metal Dichalcogenides
• Space-compatible cavity-enhanced single-photon generation with hexagonal boron nitride
• Bright single photon emitters with enhanced quantum efficiency in a two-dimensional semiconductor coupled with dielectric nano-antennas
• Purcell-enhanced single photon source based on a deterministically placed WSe${}_2$ monolayer quantum dot in a circular Bragg grating cavity
• Ultra-bright single photon source based on an atomically thin material
• Tunable optical nonlinearity for TMD polaritons dressed by a Fermi sea
• Microscopic theory of exciton and trion polaritons in doped monolayers of transition metal dichalcogenides
• Fabry-Perot microcavity spectra have a fine structure
• High-purity and stable single-photon emission in bilayer WSe${}_2$ via phonon-assisted excitation
• Optical microcavity characterization via resonance spectra and modes
• Fabrication of photonic nanostructures from hexagonal boron nitride
• Optical remote control of a charge qubit