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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 (SPPs) interacting with excitons in a semiconductor monolayer layer. In this work, we utilize coherent population oscillations of coupled exciton-SPPs in monolayer WSe2 to demonstrate slow light, a ~600 fold decrease of the group velocity. Specifically, we use a two-color laser technique where the coupling between the two laser fields gives rise to a narrow ~3 µeV coherent population oscillation resonances, that result 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.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Optical resonances, slow light, surface-plasmon polaritons

Date published: 2022-10-20

Publisher: Springer Science and Business Media LLC

Journal:

• Nature Communications (ISSN: 20411723) vol. 13 issue. 1 6216

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Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1038/s41467-022-33965-8

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Updated at: 2025-02-27 08:31:08 +0900

Published on MDR: 2025-02-27 08:31:08 +0900