Regular Article – Clusters and Nanostructures
Multiple magnetic dipole excitation in permittivity-asymmetric all-dielectric metamaterials induced by quasi-bound states in the continuum
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
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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