Second harmonic generation from a single plasmonic nanorod strongly coupled to a WSe2 monolayer

Chentao Li, Xin Lu, Ajit Srivastava, S. David Storm, Rachel Gelfand, Matthew Pelton, Maxim Sukharev, Hayk Harutyunyan

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Monolayer transition metal dichalcogenides, coupled to metal plasmonic nanocavities, have recently emerged as new platforms for strong light-matter interactions. These systems are expected to have nonlinear-optical properties that will enable them to be used as entangled photon sources, compact wave-mixing devices, and other elements for classical and quantum photonic technologies. Here, we report the first experimental investigation of the nonlinear properties of these strongly coupled systems, by observing second harmonic generation from a WSe2 monolayer strongly coupled to a single gold nanorod. The pump-frequency dependence of the second-harmonic signal displays a pronounced splitting that can be explained by a coupled-oscillator model with second-order nonlinearities. Rigorous numerical simulations utilizing a nonperturbative nonlinear hydrodynamic model of conduction electrons support this interpretation and reproduce experimental results. Our study thus lays the groundwork for understanding the nonlinear properties of strongly coupled nanoscale systems.

Original languageEnglish (US)
Pages (from-to)1599-1605
Number of pages7
JournalNano Letters
Volume21
Issue number4
DOIs
StatePublished - Feb 24 2021

Keywords

  • Nonlinear optics
  • Plasmon-exciton polaritons
  • Rabi splitting
  • Second harmonic generation
  • Strong coupling
  • Transition metal dichalcogenides

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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