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

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.

Metadata

Item Type:	Article
Authors/Creators:	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. https://orcid.org/0000-0002-3972-8344 Krizhanovskii, D.N. Iorsh, I.V.
Copyright, Publisher and Additional Information:	© The Author(s) 2020. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
Keywords:	cond-mat.mes-hall; cond-mat.mes-hall; physics.optics
Dates:	Published: 31 December 2020 Published (online): 9 April 2020 Accepted: 10 March 2020
Institution:	The University of Sheffield
Academic Units:	The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield)
Funding Information:	Funder Grant number Engineering and Physical Science Research Council (EPSRC) EP/P026850/1
Depositing User:	Symplectic Sheffield
Date Deposited:	27 Nov 2019 14:18
Last Modified:	27 Nov 2020 17:03
Status:	Published
Publisher:	Springer Nature
Refereed:	Yes
Identification Number:	10.1038/s41377-020-0286-z
Related URLs:	arXiv URL
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:153937

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

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