Plasmon-exciton polaritons in two-dimensional semiconductor/metal interfaces

P. A. D. Gonçalves, L. P. Bertelsen, Sanshui Xiao, N. Asger Mortensen*

*Corresponding author for this work

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The realization and control of polaritons is of paramount importance in the prospect of novel photonic devices. Here, we investigate the emergence of plasmon-exciton polaritons in hybrid structures consisting of a two-dimensional transition-metal dichalcogenide (TMDC) deposited onto a metal substrate or coating a metallic thin film. We determine the polaritonic spectrum and show that, in the former case, the addition of a top dielectric layer and, in the latter case, the thickness of the metal film can be used to tune and promote plasmon-exciton interactions well within the strong-coupling regime. Our results demonstrate that Rabi splittings exceeding 100 meV can readily be achieved in planar dielectric/TMDC/metal structures under ambient conditions. We thus believe that this Rapid Communication provides a simple and intuitive picture to tailor strong coupling in plexcitonics with potential applications for engineering compact photonic devices with tunable optical properties.
Original languageEnglish
Article number041402(R)
JournalPhysical Review B
Issue number4
Publication statusPublished - 2018

Bibliographical note

©2018 American Physical Society


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