Effects of exciton-plasmon strong coupling on third harmonic generation of WS2 monolayer at periodic plasmonic interfaces

Abstract

We study theoretically optical response of WS2 monolayer located near periodic metal nanostructured arrays in two and three dimensions. The emphasis of simulations is on the strong coupling regime of excitons supported by WS2 and surface plasmon-polaritons supported by various periodic plasmonic interfaces. It is demonstrated that a monolayer of WS2 placed in a close proximity of periodic arrays of either slits or holes results in a Rabi splitting of the corresponding surface plasmon-polariton resonance as revealed in calculated transmission and reflection spectra. The nonlinear regime, at which the monolayer of WS2 exhibits the third harmonic generation is studied in details. It is shown that at the strong coupling regime the third harmonic signal is significantly affected by plasmon-polaritons and the symmetry of hybrid exciton-plasmon modes. It is also shown that the local electromagnetic field induced by plasmons is the major contributor to the enhancement of the third harmonic signal in three dimensions. The local electromagnetic fields resulted from the third harmonic generation are greatly localized and highly sensitive to the environment making it a great tool for nano-probes.

References in corpus (5)

• Strong coupling between surface plasmon polaritons and emitters
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• Coherent Coupling of WS_2 Monolayers with Metallic Photonic Nanostructures at Room Temperature
• Topical Review: optics of exciton-plasmon nanomaterials
• Molecular plasmonics: the role of ro-vibrational molecular states in exciton-plasmon materials under strong coupling conditions

Cited by in corpus (6)

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• Screened Strong Coupling of Excitons in Multilayer WS2 with Collective Plasmonic Resonances
• Plasmon enhanced second harmonic generation by periodic arrays of triangular nanoholes coupled to quantum emitters
• Calculation of the nonlinear response functions of intra-exciton transitions in two-dimensional transition metal dichalcogenides
• Harmonic generation by metal nanostructures optically coupled to 2D transition metal dichalcogenide
• Inverse design of broadband, strongly-coupled plexcitonic nonlinear metasurfaces