Nonlinear polaritons in a monolayer semiconductor coupled to optical bound states in the continuum

Vasily Kravtsov, Ekaterina Khestanova, Fedor A. Benimetskiy, Tatiana Ivanova, Anton K. Samusev, Ivan S. Sinev, Dmitry Pidgayko, Alexey M. Mozharov, Ivan S. Mukhin, Maksim S. Lozhkin, Yuri V. Kapitonov, Andrey S. Brichkin, Vladimir D. Kulakovskii, Ivan A. Shelykh, Alexander I. Tartakovskii, Paul M. Walker, Maurice S. Skolnick, Dmitry N. Krizhanovskii, Ivan V. Iorsh

Research output

7 Citations (Scopus)

Abstract

Optical bound states in the continuum (BICs) provide a way to engineer very narrow resonances in photonic crystals. The extended interaction time in these systems is particularly promising for the enhancement of nonlinear optical processes and the development of the next generation of active optical devices. However, the achievable interaction strength is limited by the purely photonic character of optical BICs. Here, we mix the optical BIC in a photonic crystal slab with excitons in the atomically thin semiconductor MoSe2 to form nonlinear exciton-polaritons with a Rabi splitting of 27 meV, exhibiting large interaction-induced spectral blueshifts. The asymptotic BIC-like suppression of polariton radiation into the far field toward the BIC wavevector, in combination with effective reduction of the excitonic disorder through motional narrowing, results in small polariton linewidths below 3 meV. Together with a strongly wavevector-dependent Q-factor, this provides for the enhancement and control of polariton–polariton interactions and the resulting nonlinear optical effects, paving the way toward tuneable BIC-based polaritonic devices for sensing, lasing, and nonlinear optics.

Original languageEnglish
Article number56
Number of pages8
JournalLight: Science and Applications
Volume9
Issue number1
DOIs
Publication statusPublished - 9 Apr 2020

Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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    Kravtsov, V., Khestanova, E., Benimetskiy, F. A., Ivanova, T., Samusev, A. K., Sinev, I. S., Pidgayko, D., Mozharov, A. M., Mukhin, I. S., Lozhkin, M. S., Kapitonov, Y. V., Brichkin, A. S., Kulakovskii, V. D., Shelykh, I. A., Tartakovskii, A. I., Walker, P. M., Skolnick, M. S., Krizhanovskii, D. N., & Iorsh, I. V. (2020). Nonlinear polaritons in a monolayer semiconductor coupled to optical bound states in the continuum. Light: Science and Applications, 9(1), [56]. https://doi.org/10.1038/s41377-020-0286-z