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Tunable Fano Resonance and Plasmon–Exciton Coupling in Single Au Nanotriangles on Monolayer WS 2 at Room Temperature
Author(s) -
Wang Mingsong,
Krasnok Alex,
Zhang Tianyi,
Scarabelli Leonardo,
Liu He,
Wu Zilong,
LizMarzán Luis M.,
Terrones Mauricio,
Alù Andrea,
Zheng Yuebing
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201705779
Subject(s) - plasmon , exciton , fano resonance , monolayer , materials science , nanophotonics , optoelectronics , surface plasmon resonance , resonance (particle physics) , dielectric , molecular physics , condensed matter physics , nanoparticle , nanotechnology , atomic physics , physics
Tunable Fano resonances and plasmon–exciton coupling are demonstrated at room temperature in hybrid systems consisting of single plasmonic nanoparticles deposited on top of the transition metal dichalcogenide monolayers. By using single Au nanotriangles (AuNTs) on monolayer WS 2 as model systems, Fano resonances are observed from the interference between a discrete exciton band of monolayer WS 2 and a broadband plasmonic mode of single AuNTs. The Fano lineshape depends on the exciton binding energy and the localized surface plasmon resonance strength, which can be tuned by the dielectric constant of surrounding solvents and AuNT size, respectively. Moreover, a transition from weak to strong plasmon–exciton coupling with Rabi splitting energies of 100–340 meV is observed by rationally changing the surrounding solvents. With their tunable plasmon–exciton interactions, the proposed WS 2 –AuNT hybrids can open new pathways to develop active nanophotonic devices.