Nonlinear Light Generation from a Single Plasmonic Nanorod Strongly Coupled to a WSe2 Monolayer

Hayk Harutyunyan

doi:10.1117/12.2593251

3 August 2021 Nonlinear Light Generation from a Single Plasmonic Nanorod Strongly Coupled to a WSe2 Monolayer

Hayk Harutyunyan

Proceedings Volume 11803, Enhanced Spectroscopies and Nanoimaging 2021; 118030I (2021) https://doi.org/10.1117/12.2593251
Event: SPIE Nanoscience + Engineering, 2021, San Diego, California, United States

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.

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Citation Download Citation

Hayk Harutyunyan "Nonlinear Light Generation from a Single Plasmonic Nanorod Strongly Coupled to a WSe2 Monolayer", Proc. SPIE 11803, Enhanced Spectroscopies and Nanoimaging 2021, 118030I (3 August 2021); https://doi.org/10.1117/12.2593251

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KEYWORDS

Nanorods

Plasmonics

Complex systems

Systems modeling

Electrons

Gold

Harmonic generation

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