Coupling single photons from discrete quantum emitters in WSe${}_2$ to lithographically defined plasmonic slot-waveguides

Abstract

We report the observation of the generation and routing of single plasmons generated by localized excitons in a WSe${}_2$ monolayer flake exfoliated onto lithographically defined Au-plasmonic waveguides. Statistical analysis of the position of different quantum emitters shows that they are $(3.3\pm 0.7)\times$ more likely to form close to the edges of the plasmonic waveguides. By characterizing individual emitters we confirm their single-photon character via the observation of antibunching of the signal ($g^{(2)}(0)=0.42$) and demonstrate that specific emitters couple to the modes of the proximal plasmonic waveguide. Time-resolved measurements performed on emitters close to, and far away from the plasmonic nanostructures indicate that Purcell factors up to $15\pm 3$ occur, depending on the precise location of the quantum emitter relative to the tightly confined plasmonic mode. Measurement of the point spread function of five quantum emitters relative to the waveguide with <50nm precision are compared with numerical simulations to demonstrate potential for higher increases of the coupling efficiency for ideally positioned emitters. The integration of such strain-induced quantum emitters with deterministic plasmonic routing is a step toward deep-subwavelength on-chip single quantum light sources.

References in corpus (18)

• Atomically thin MoS2: A new direct-gap semiconductor
• Coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides
• Control of valley polarization in monolayer MoS2 by optical helicity
• Valley polarization in MoS2 monolayers by optical pumping
• MoS_2 as an ideal material for valleytronics: valley-selective circular dichroism and valley Hall effect
• Exciton Binding Energy and Nonhydrogenic Rydberg Series in Monolayer WS2
• Observation of giant bandgap renormalization and excitonic effects in a monolayer transition metal dichalcogenide semiconductor
• Optical Generation of Excitonic Valley Coherence in Monolayer WSe2
• Excitonic linewidth approaching the homogeneous limit in MoS2 based van der Waals heterostructures : accessing spin-valley dynamics
• Large-scale quantum-emitter arrays in atomically thin semiconductors
• Deterministic strain-induced arrays of quantum emitters in a two-dimensional semiconductor
• Robust optical emission polarization in MoS2 monolayers through selective valley excitation
• Strain-induced spatial and spectral isolation of quantum emitters in mono- and bi-layer WSe2
• Direct exciton emission from atomically thin transition metal dichalcogenide heterostructures near the lifetime limit
• Cascaded emission of single photons from the biexciton in monolayered WSe2
• Nanobubble induced formation of quantum emitters in monolayer semiconductors
• Coupling emission from single localized defects in 2D semiconductor to surface plasmon polaritons
• Coupling Quantum Emitters in WSe2 Monolayers to a Metal-Insulator-Metal Waveguide

Cited by in corpus (17)

• Atomistic defect states as quantum emitters in monolayer MoS${}_2$
• Enhanced Light-Matter Interaction in Two-Dimensional Transition Metal Dichalcogenides
• Strain-tunable Single Photon Sources in WSe2 Monolayers
• Bright single photon emitters with enhanced quantum efficiency in a two-dimensional semiconductor coupled with dielectric nano-antennas
• Van der Waals Materials for Applications in Nanophotonics
• A single-crystalline silver plasmonic circuit for visible quantum emitters
• Enabling remote quantum emission in 2D semiconductors via porous metallic networks
• Coupling Quantum Emitters in WSe2 Monolayers to a Metal-Insulator-Metal Waveguide
• Tuning the Optical Properties of an MoSe${}_2$ Monolayer Using Nanoscale Plasmonic Antennas
• Single Molecule Nonlinearity in a Plasmonic Waveguide
• Van der Waals Nanoantennas on Gold as Hosts for Hybrid Mie-Plasmonic Resonances
• Interferometric near-field characterization of plasmonic slot waveguides in single- and poly-crystalline gold films
• High-purity and stable single-photon emission in bilayer WSe${}_2$ via phonon-assisted excitation
• Origin of selective enhancement of sharp defect emission lines in monolayer WSe${}_2$ on rough metal substrate
• 2D semiconductors as on-chip light sources for integrated nanophotonics
• Electrically driven strain-induced deterministic single-photon emitters in a van der Waals heterostructure
• Single photon sources from two dimensional materials and their interfacing with plasmonic waveguides