Deterministic coupling of quantum emitters in WSe$_2$ monolayers to plasmonic nanocavities

TL;DR

This paper demonstrates deterministic coupling of quantum emitters in WSe$_2$ monolayers to plasmonic nanocavities, achieving strong, polarized single-photon emission suitable for integrated quantum photonics.

Contribution

It introduces a method for site-selective creation of quantum emitters in WSe$_2$ coupled to plasmonic nanostructures, enabling scalable quantum photonic device integration.

Findings

Single photon emission confirmed with $g^{2}(0)=0.17$

Strong polarization matching with plasmonic resonances

Deterministic emitter-nanocavity coupling achieved

Abstract

We discuss coupling of site-selectively induced quantum emitters in exfoliated monolayers of WSe$_2$ to plasmonic nanostructures. Squared and rectangular gold nanopillars, which are arranged in pitches of \SI{4}{\micro\meter} on the surface, have sizes of tens of nanometers, and act as seeds for the formation of quantum emitters in the atomically thin materials. We observe chraracteristic narrow-band emission signals from the monolayers, which correspond well with the positions of the metallic nanopillars with and without thin dielectric coating. Single photon emission from the emitters is confirmed by autocorrelation measurements, yielding $g^{2}(\tau=0)$ values as low as 0.17. Moreover, we observe a strong co-polarization of our single photon emitters with the frequency matched plasmonic resonances, indicating deterministic light-matter coupling. Our work represents a significant step towards the scalable implementation of coupled quantum emitter-resonator systems for highly integrated quantum photonic and plasmonics applications.