Observation of Tunable Charged Exciton Polaritons in Hybrid Monolayer WS2-Plasmonic Nanoantenna System
Journal article, 2018

© 2018 American Chemical Society. Formation of dressed light-matter states in optical structures, manifested as Rabi splitting of the eigen energies of a coupled system, is one of the key effects in quantum optics. In pursuing this regime with semiconductors, light is usually made to interact with excitons, electrically neutral quasiparticles of semiconductors; meanwhile interactions with charged three-particle states, trions, have received little attention. Here, we report on strong interaction between localized surface plasmons in silver nanoprisms and excitons and trions in monolayer tungsten disulfide (WS 2 ). We show that the plasmon-exciton interactions in this system can be efficiently tuned by controlling the charged versus neutral exciton contribution to the coupling process. In particular, we show that a stable trion state emerges and couples efficiently to the plasmon resonance at low temperature by forming three bright intermixed plasmon-exciton-trion polariton states. Our findings open up a possibility to exploit electrically charged polaritons at the single nanoparticle level.

Strong coupling

monolayer WS2





Jorge Cuadra

Chalmers, Physics, Bionanophotonics

Denis Baranov

Chalmers, Physics, Bionanophotonics

Martin Wersäll

Chalmers, Physics, Bionanophotonics

Ruggero Verre

Chalmers, Physics, Bionanophotonics

Tomasz Antosiewicz

University of Warsaw

Chalmers, Physics, Bionanophotonics

Timur Shegai

Chalmers, Physics, Bionanophotonics

Nano Letters

1530-6984 (ISSN) 1530-6992 (eISSN)

Vol. 18 3 1777-1785

Areas of Advance

Nanoscience and Nanotechnology (SO 2010-2017, EI 2018-)

Subject Categories

Atom and Molecular Physics and Optics

Condensed Matter Physics


Nanofabrication Laboratory



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