Slow light in a 2D semiconductor plasmonic structure

Matthew Klein, Rolf Binder, Michael R. Koehler, David G. Mandrus, Takashi Taniguchi, Kenji Watanabe and John R. Schaibley ()
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Matthew Klein: University of Arizona
Rolf Binder: University of Arizona
Michael R. Koehler: University of Tennessee
David G. Mandrus: University of Tennessee
Takashi Taniguchi: National Institute for Materials Science
Kenji Watanabe: National Institute for Materials Science
John R. Schaibley: University of Arizona

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract Spectrally narrow optical resonances can be used to generate slow light, i.e., a large reduction in the group velocity. In a previous work, we developed hybrid 2D semiconductor plasmonic structures, which consist of propagating optical frequency surface-plasmon polaritons interacting with excitons in a semiconductor monolayer. Here, we use coupled exciton-surface plasmon polaritons (E-SPPs) in monolayer WSe2 to demonstrate slow light with a 1300 fold decrease of the SPP group velocity. Specifically, we use a high resolution two-color laser technique where the nonlinear E-SPP response gives rise to ultra-narrow coherent population oscillation (CPO) resonances, resulting in a group velocity on order of 105 m/s. Our work paves the way toward on-chip actively switched delay lines and optical buffers that utilize 2D semiconductors as active elements.

Date: 2022
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DOI: 10.1038/s41467-022-33965-8

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