Strong Exciton–Plasmon Coupling in MoS2 Coupled with Plasmonic Lattice

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• 作者：Wenjing Liu ; Bumsu Lee ; Carl H. Naylor ; Ho-Seok Ee ; Joohee Park ; A. T. Charlie Johnson ; Ritesh Agarwal
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：February 10, 2016
• 年：2016
• 卷：16
• 期：2
• 页码：1262-1269
• 全文大小：588K
• ISSN：1530-6992

文摘

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.