https://doi.org/10.1140/epjd/s10053-023-00637-1
Regular Article – Clusters and Nanostructures
Multiple magnetic dipole excitation in permittivity-asymmetric all-dielectric metamaterials induced by quasi-bound states in the continuum
1
Henan Province Engineering Research Center of Microcavity and Photoelectric Intelligent Sensing, School of Electronics and Electrical Engineering, Shangqiu Normal University, 476000, Henan, China
2
School of Mathematical and Physical Sciences, Dalian Polytechnic University, 116034, Dalian, China
Received:
13
December
2022
Accepted:
14
March
2023
Published online:
6
April
2023
In this work, we numerically investigate multiple magnetic dipole (MD) excitation in an all-dielectric metamaterial of permittivity-asymmetric nanodisk dimer with symmetric geometric parameters. Besides the original MD mode, the permittivity-asymmetric metamaterials can support symmetry-protected dual quasi-bound states in the continuum (BICs), which show inverse square dependence of Q-factors on the asymmetric parameter. Far-field multiple decompositions and magnetic near-field enhancements further indicate that such two quasi-BICs are governed by MD responses, where asymmetric localized MD distributions in near-infrared wavelength realize indirectly manipulate the localized magnetic field. Further, multiple MDs with high Q-factors are designed as a multiwavelength sensor with a near theoretical FOM of ~2300.
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© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
