Comparing exciton-polariton couplings in two-dimensional MoS2 cavities

Lauren A. Hurley; Debjit Ghoshal; Jao van de Lagemaat; Sean E. Shaheen

doi:10.1117/12.3028284

2 October 2024 Comparing exciton-polariton couplings in two-dimensional MoS₂ cavities

Lauren A. Hurley, Debjit Ghoshal, Jao van de Lagemaat, Sean E. Shaheen

Proceedings Volume 13110, Active Photonic Platforms (APP) 2024; 1311005 (2024) https://doi.org/10.1117/12.3028284
Event: Nanoscience + Engineering, 2024, San Diego, California, United States

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.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Lauren A. Hurley, Debjit Ghoshal, Jao van de Lagemaat, and Sean E. Shaheen "Comparing exciton-polariton couplings in two-dimensional MoS₂ cavities", Proc. SPIE 13110, Active Photonic Platforms (APP) 2024, 1311005 (2 October 2024); https://doi.org/10.1117/12.3028284

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