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Dark‐Exciton‐Mediated Fano Resonance from a Single Gold Nanostructure on Monolayer WS 2 at Room Temperature
Author(s) -
Wang Mingsong,
Wu Zilong,
Krasnok Alex,
Zhang Tianyi,
Liu Mingzu,
Liu He,
Scarabelli Leonardo,
Fang Jie,
LizMarzán Luis M.,
Terrones Mauricio,
Alù Andrea,
Zheng Yuebing
Publication year - 2019
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201900982
Subject(s) - exciton , fano resonance , monolayer , plasmon , nanophotonics , laser linewidth , materials science , dielectric , resonance (particle physics) , optoelectronics , surface plasmon resonance , condensed matter physics , molecular physics , nanotechnology , physics , atomic physics , optics , nanoparticle , laser
Strong spatial confinement and highly reduced dielectric screening provide monolayer transition metal dichalcogenides with strong many‐body effects, thereby possessing optically forbidden excitonic states (i.e., dark excitons) at room temperature. Herein, the interaction of surface plasmons with dark excitons in hybrid systems consisting of stacked gold nanotriangles and monolayer WS 2 is explored. A narrow Fano resonance is observed when the hybrid system is surrounded by water, and the narrowing of the spectral Fano linewidth is attributed to the plasmon‐enhanced decay of dark K ‐ K excitons. These results reveal that dark excitons in monolayer WS 2 can strongly modify Fano resonances in hybrid plasmon–exciton systems and can be harnessed for novel optical sensors and active nanophotonic devices.