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

• Main Authors: Iff, Oliver, Lundt, Nils, Betzold, Simon, Tripathi, Laxmi Narayan, Emmerling, Monika, Lee, Young Jin, Kwon, Soon-Hong, Höfling, Sven, Schneider, Christian
• Format: Journal Article
• Language: English
• Published: 17-06-2018
• Subjects: Physics - Mesoscale and Nanoscale Physics
• DOI: 10.48550/arxiv.1806.06363

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.