Multipolar second-harmonic generation from high-Q quasi-BIC states in subwavelength resonators

Volkovskaya, I., Xu, L. ORCID: 0000-0001-9071-4311, Huang, L., Smirnov, A.I., Miroshnichenko, A.E. and Smirnova, D., 2020. Multipolar second-harmonic generation from high-Q quasi-BIC states in subwavelength resonators. Nanophotonics, 9 (12), pp. 3953-3963. ISSN 2192-8614

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We put forward the multipolar model which captures the physics behind linear and nonlinear response driven by high-quality (high-Q) supercavity modes in subwavelength particles. We show that the formation of such trapped states associated with bound states in the continuum (quasi-BIC) can be understood through multipolar transformations of coupled leaky modes. The quasi-BIC state appears with increasing the order of the dominating multipole, where dipolar losses are completely suppressed. The efficient optical coupling to this state in the AlGaAs nanodisk is implemented via azimuthally polarized beam illumination matching its multipolar origin. We establish a one-to-one correspondence between the standard phenomenological non-Hermitian coupled-mode theory and multipolar models. The derived multipolar composition of the generated second-harmonic radiation from the AlGaAs nanodisk is then validated with full-wave numerical simulations. Back-action of the second-harmonic radiation onto the fundamental frequency is taken into account in the coupled nonlinear model with pump depletion. A hybrid metal-dielectric nanoantenna is proposed to augment the conversion efficiency up to tens of per cent due to increasing quality factors of the involved resonant states. Our findings delineate novel promising strategies in the design of functional elements for nonlinear nanophotonics applications.

Item Type: Journal article
Publication Title: Nanophotonics
Creators: Volkovskaya, I., Xu, L., Huang, L., Smirnov, A.I., Miroshnichenko, A.E. and Smirnova, D.
Publisher: Walter de Gruyter GmbH
Date: 2020
Volume: 9
Number: 12
ISSN: 2192-8614
Rights: © 2020 Irina Volkovskaya et al., published by De Gruyter. Open Access. This work is licensed under the Creative Commons Attribution 4.0 International License.
Divisions: Schools > School of Science and Technology
Record created by: Linda Sullivan
Date Added: 29 Oct 2020 10:24
Last Modified: 31 May 2021 15:13

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