Q-factor mediated quasi-BIC resonances coupling in asymmetric dimer lattices

Gao, Y, Xu, L ORCID: https://orcid.org/0000-0001-9071-4311 and Shen, X, 2022. Q-factor mediated quasi-BIC resonances coupling in asymmetric dimer lattices. Optics Express, 30 (26), pp. 46680-46692. ISSN 1094-4087

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Abstract

Resonance coupling in the regime of bound states in the continuum (BICs) provides an efficient method for engineering nanostructure’s optical response with various lineshape while maintaining an ultra-narrow linewidth feature, where the quality factor of resonances plays a crucial role. Independent manipulation of the Q factors of BIC resonances enables full control of interaction behavior as well as both near- and far-field light engineering. In this paper, we harness reflection symmetry (RS) and translational symmetry (TS) protected BIC resonances supported in an asymmetric dimer lattice and investigate Q-factor-mediated resonance coupling behavior under controlled TS and RS perturbations. We focus on in-plane electrical dipole BIC (EDi-BIC) and magnetic dipole BIC (MD-BIC) which are protected by RS, and out-of-plane electrical dipole BIC (EDo-BIC) protected by TS. The coupling between EDi-BIC and EDo-BIC exhibits a resonance crossing behavior where the transmission spectrum at the crossing could be tuned flexibly, showing an electromagnetically induced transparency lineshape or satisfying the lattice Kerker condition with pure phase modulation capability depending on TS and RS perturbed Q factors. While the coupling between MD-BIC and EDo-BIC shows an avoided resonance crossing behavior, where the strongly coupled resonances would lead to the formation of a Friedrich–Wintgen BICs whose spectral position could also be shifted by tuning the Q factors. Our results suggest an intriguing platform to explore BIC resonance interactions with independent Q factor manipulation capability for realizing multi-functional meta-devices.

Item Type:	Journal article
Publication Title:	Optics Express
Creators:	Gao, Y., Xu, L. and Shen, X.
Publisher:	Optica Publishing Group
Date:	19 December 2022
Volume:	30
Number:	26
ISSN:	1094-4087
Identifiers:	Number Type 10.1364/oe.475580 DOI 1626490 Other
Rights:	© 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement. Authors and readers may use, reuse, and build upon the article, or use it for text or data mining without asking prior permission from the publisher or the Author(s), as long as the purpose is non-commercial and appropriate attribution is maintained.
Divisions:	Schools > School of Science and Technology
Record created by:	Laura Ward
Date Added:	12 Dec 2022 09:38
Last Modified:	12 Dec 2022 09:38
URI:	https://irep.ntu.ac.uk/id/eprint/47620

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