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

Maxim Sukharev, Ruth Pachter

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We study theoretically the optical response of a WS2 monolayer located near periodic metal nanostructured arrays in two and three dimensions. The emphasis of the simulations is on the strong coupling between excitons supported by WS2 and surface plasmon-polaritons supported by various periodic plasmonic interfaces. It is demonstrated that a monolayer of WS2 placed in 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 few-layer WS2 exhibits experimentally third harmonic generation (THG), is studied in detail. Monolayer transition metal dichalcogenides (TMDs) do not exhibit THG because they are non-centrosymmetric, but here we use the monolayer as an approximation to a thin TMD nanostructure. We show that in 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 resulting from the third harmonic generation are greatly localized and highly sensitive to the environment, thus making it a great tool for nano-probes.

Original languageEnglish (US)
Article number094701
JournalJournal of Chemical Physics
Volume148
Issue number9
DOIs
StatePublished - Mar 7 2018
Externally publishedYes

Fingerprint

Harmonic generation
polaritons
Monolayers
harmonic generations
excitons
electromagnetic fields
transition metals
Electromagnetic fields
Transition metals
harmonics
plasmons
Plasmons
slits
proximity
Surface plasmon resonance
Nanostructures
augmentation
probes
Metals
symmetry

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Effects of exciton-plasmon strong coupling on third harmonic generation by two-dimensional WS2 at periodic plasmonic interfaces. / Sukharev, Maxim; Pachter, Ruth.

In: Journal of Chemical Physics, Vol. 148, No. 9, 094701, 07.03.2018.

Research output: Contribution to journalArticle

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