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Coupling Single Photons from Discrete Quantum Emitters in WSe2 to Lithographically Defined Plasmonic Slot Waveguides
M Blauth1,2, M Jürgensen1, G Vest1
1Walter Schottky Institut and Physik Department , Technische Universität München , Am Coulombwall 4 , 85748 Garching , Germany.
Nano Letters
|August 29, 2018
Summary
Researchers observed single plasmons from excitons in WSe2 integrated with plasmonic waveguides. This work is a step toward on-chip single quantum light sources with enhanced light-matter interactions.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanophotonics
Background:
- Localized excitons in 2D materials like WSe2 are potential quantum emitters.
- Plasmonic waveguides offer subwavelength light confinement and routing capabilities.
Purpose of the Study:
- To demonstrate the generation and routing of single plasmons from localized excitons in WSe2.
- To investigate the coupling efficiency between WSe2 quantum emitters and plasmonic waveguides.
- To explore the potential for on-chip integration of quantum emitters and plasmonic devices.
Main Methods:
- Exfoliation of WSe2 monolayer flakes onto lithographically defined gold (Au) plasmonic waveguides.
- Statistical analysis of quantum emitter positions relative to waveguide edges.
- Characterization of individual emitters, including single-photon characterization (antibunching) and coupling to plasmonic modes.
- Time-resolved measurements to determine Purcell factors.
- Comparison of experimental point spread function measurements with numerical simulations.
Main Results:
- Quantum emitters were observed to form preferentially near plasmonic waveguide edges (3.3 ± 0.7 times more likely).
- Single-photon emission from WSe2 emitters was confirmed via antibunching (g(2)(0) = 0.42).
- Efficient coupling between specific emitters and waveguide modes was demonstrated.
- Purcell factors up to 15 ± 3 were measured, dependent on emitter position.
- Experimental results align with numerical simulations, indicating potential for improved coupling efficiency.
Conclusions:
- Demonstrated efficient generation and routing of single plasmons from WSe2 excitons coupled to plasmonic waveguides.
- Validated the use of WSe2 as a platform for on-chip quantum light sources.
- Highlighted the critical role of precise emitter positioning for maximizing light-matter interaction and Purcell enhancement.
- Paved the way for deep-subwavelength on-chip single quantum light sources through integration of quantum emitters and plasmonic routing.
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