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  • Letter
  • Open Access

Strong coupling between a dielectric nanocavity and a monolayer transition metal dichalcogenide

F. Schröder1,2, P. Wyborski1, M. Xiong1,2, G. Kountouris1,2, B. Munkhbat1, M. Wubs1,2, P. T. Kristensen1,2, J. Mørk1,2, and N. Stenger1,2,*

  • *Contact author: niste@dtu.dk
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Phys. Rev. Research 7, L042041 – Published 24 November, 2025

DOI: https://doi.org/10.1103/cd3m-zjhl

Abstract

We demonstrate strong coupling between light in a dielectric nanocavity with deep subwavelength confinement and excitons in a monolayer of molybdenum ditelluride. Avoided crossing is demonstrated by both photoluminescence and reflection measurements, from which we extract a light-matter interaction strength of gPL=5.3±0.3meV and gR=4.7±0.7meV, respectively. The associated Rabi splitting is twice as large as the system's losses. These values are in good agreement with values obtained by an exciton reaction coordinate formalism, yielding gtheory=5.2±0.7meV. The strong light-matter interaction, combined with low losses and subwavelength confinement of light, demonstrates a regime of light-matter interactions where strong nonlinearities at the single-photon level are expected.

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Phys. Rev. Research 7, L042041– Published 24 November, 2025
  • Received 20 February 2025
  • Revised 4 June 2025
  • Accepted 25 October 2025
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