Strong Exciton–Plasmon Coupling in MoS2 Coupled with Plasmonic Lattice

• Published in: Nano letters Vol. 16; no. 2; pp. 1262 - 1269
• Main Authors: Liu, Wenjing, Lee, Bumsu, Naylor, Carl H, Ee, Ho-Seok, Park, Joohee, Johnson, A. T. Charlie, Agarwal, Ritesh
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 10.02.2016
• Subjects: plexciton; polariton; strong coupling; MoS2; plasmonic lattice
• ISSN: 1530-6984; 1530-6992; 1530-6992
• DOI: 10.1021/acs.nanolett.5b04588

We demonstrate strong exciton–plasmon coupling in silver nanodisk arrays integrated with monolayer MoS2 via angle-resolved reflectance microscopy spectra of the coupled system. Strong exciton–plasmon coupling is observed with the exciton–plasmon coupling strength up to 58 meV at 77 K, which also survives at room temperature. The strong coupling involves three types of resonances: MoS2 excitons, localized surface plasmon resonances (LSPRs) of individual silver nanodisks and plasmonic lattice resonances of the nanodisk array. We show that the exciton–plasmon coupling strength, polariton composition, and dispersion can be effectively engineered by tuning the geometry of the plasmonic lattice, which makes the system promising for realizing novel two-dimensional plasmonic polaritonic devices.