Comparing Exciton-Polariton Couplings in Two-Dimensional MoS2 Cavities: Paper No. 1311005

Lauren Hurley, Debjit Ghoshal, Jao Van De Lagemaat, Sean Shaheen

Research output: Contribution to conferencePaper

Abstract

Exciton-polaritons (EPs) are an emerging approach to achieve strong light-matter coupling and robust quantum phenomena, with application to areas such as photonic neuromorphic computing for instance reservoir computing. 2D transition metal dichalcogenides (TMDs) are promising candidates to host EPs due to their potential for strong coupling as evidenced by large Rabi splitting energies, which in the case of few-layer MoS2 has been demonstrated to reach 293 meV when coupled to the C exciton, placing it in the ultrastrong coupling regime, at room temperature. Here we examine how the Rabi splitting of CVD-grown monolayer MoS2 in a cavity can be optimized by tuning two variables: cavity geometry (thickness of silver and dielectric spacers) and the targeted exciton for coupling (A at about 1.9 eV, B at about 2.06 eV, or C at about 2.9 eV). With the cavity geometry, there is a tradeoff between optical field confinement and transmission. With the targeted exciton, there may be a tradeoff between Rabi splitting and lifetime. Transfer matrix simulations are used to inform how thick the cavity layers need to be, and at what angle measurements should be performed, to achieve Rabi splitting at a certain exciton energy. Experimentally, the Rabi splitting is measured by placing the cavity at a specified angle and measuring the optical reflectance and transmittance. By fitting the data, we find Rabi splittings of 124 meV, 194 meV, and 288 meV for the A, B, and C excitons, respectively, which places them in the strong, and on the edge of the ultrastrong, coupling regime.
Original languageAmerican English
Number of pages4
DOIs
StatePublished - 2024
EventNanoscience + Engineering - San Diego, California
Duration: 18 Aug 202423 Aug 2024

Conference

ConferenceNanoscience + Engineering
CitySan Diego, California
Period18/08/2423/08/24

NREL Publication Number

  • NREL/CP-5900-92041

Keywords

  • exciton-polaritons
  • photonic neuromorphic computing
  • Rabi splitting
  • transition metal dichalcogenides

Fingerprint

Dive into the research topics of 'Comparing Exciton-Polariton Couplings in Two-Dimensional MoS2 Cavities: Paper No. 1311005'. Together they form a unique fingerprint.

Cite this