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Multiple magnetic dipole excitation in permittivity-asymmetric all-dielectric metamaterials induced by quasi-bound states in the continuum

  • Regular Article – Clusters and Nanostructures
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Abstract

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.

Graphical abstracts

Acting on magnetic dipoles in metamaterials opens novel routes to govern light−matter interaction. 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 permittivityasymmetric 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.

Resonant wavelength shifts of metamaterials (δ = 0.43) as a function of the refractive index n for gaseous medium. The insets show normalized magnetic field amplitudes |H/H0| for different modes. White arrows show the electric field directions

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Data Availability Statement

This manuscript has no associated data or the data will not be deposited. [Authors’ comment: The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.]

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Acknowledgements

This work was supported by Natural Science Foundation of Liaoning Province (2019-ZD-0124, 64194902), National Natural Science Foundation of China (11647102) and Higher Education Key Program of Henan Province of China (No. 19A140014).

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Authors and Affiliations

  1. Henan Province Engineering Research Center of Microcavity and Photoelectric Intelligent Sensing, School of Electronics and Electrical Engineering, Shangqiu Normal University, Henan, 476000, China

    Meng Wang

  2. School of Mathematical and Physical Sciences, Dalian Polytechnic University, Dalian, 116034, China

    Wudeng Wang

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  1. Meng Wang
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Wudeng Wang. The first draft of the manuscript was written by Meng Wang and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Wudeng Wang.

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Wang, M., Wang, W. Multiple magnetic dipole excitation in permittivity-asymmetric all-dielectric metamaterials induced by quasi-bound states in the continuum. Eur. Phys. J. D 77, 57 (2023). https://doi.org/10.1140/epjd/s10053-023-00637-1

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