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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

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Slow light in a 2D semiconductor plasmonic structure.

Matthew Klein¹, Rolf Binder^1,2, Michael R Koehler³

¹Department of Physics, University of Arizona, Tucson, AZ, 85721, USA.

Nature Communications

|October 20, 2022

Summary

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This summary is machine-generated.

Researchers demonstrated slow light using hybrid 2D semiconductor plasmonic structures. This technique significantly reduced the group velocity of surface-plasmon polaritons (SPPs) in WSe2, enabling potential applications in optical buffering.

Area of Science:

Condensed Matter Physics
Materials Science
Nanophotonics

Background:

Slow light, characterized by a significant reduction in group velocity, can be achieved using spectrally narrow optical resonances.
Previous research developed hybrid 2D semiconductor plasmonic structures involving surface-plasmon polaritons (SPPs) and semiconductor excitons.

Purpose of the Study:

To demonstrate slow light generation in monolayer WSe2 using coupled exciton-surface plasmon polaritons (E-SPPs).
To investigate the potential of 2D semiconductors for on-chip optical delay lines and buffers.

Main Methods:

Utilized coupled exciton-surface plasmon polaritons (E-SPPs) in monolayer WSe2.
Employed a high-resolution two-color laser technique to excite nonlinear E-SPP responses.
Observed ultra-narrow coherent population oscillation (CPO) resonances.

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Main Results:

Achieved a 1300-fold decrease in the group velocity of SPPs.
Demonstrated slow light with a group velocity on the order of 10^5 m/s.
Confirmed the effectiveness of E-SPPs in monolayer WSe2 for slow light generation.

Conclusions:

Coupled E-SPPs in 2D semiconductors like WSe2 are a viable mechanism for generating slow light.
This research opens avenues for developing on-chip optical delay lines and buffers using 2D materials.
The findings highlight the potential of 2D semiconductors as active elements in photonic devices.