Volume 16Issue 4
Jul. 2023
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WANG Lin, DONG Fan-long. High quality factor dual wavelength Fano resonance based on continuous bound states[J]. Chinese Optics, 2023, 16(4): 824-832. doi: 10.37188/CO.2022-0166
Citation: WANG Lin, DONG Fan-long. High quality factor dual wavelength Fano resonance based on continuous bound states[J].Chinese Optics, 2023, 16(4): 824-832.doi:10.37188/CO.2022-0166

High quality factor dual wavelength Fano resonance based on continuous bound states

doi:10.37188/CO.2022-0166
Funds:Supported by National Natural Science Foundation of China (No. 61575008); Shenzhen Postdoctoral Scientific Research Funding Project (No. 202028555301027); Quzhou Guiding Science and Technology Research Project (No. 2021076)
More Information
  • Corresponding author:dongfanlong@sztu.edu.cn
  • Received Date:18 Jul 2022
  • Accepted Date:11 Nov 2022
  • Rev Recd Date:15 Aug 2022
  • Available Online:09 Feb 2023
  • In order to improve the quality value ( Q ) to enhance the coupling between light and matter. In this paper, a dielectric metamaterial with simple structure, low fabrication requirements was proposed. It can excite symmetric protected bound states in the continuum (BICs). The dielectric metamaterial has a planar nanopore plate composed of tetrameric pores. By changing the position of the nanopores, the symmetrical protection BIC can be transformed into the symmetrical protection quasi BIC(QBIC), and then two high Q value Fano resonances can be induced. Through simulation calculation, the Fano resonance Q value can reach 1×e6when Δ =3 nm. Then, the far-field radiation of QBIC and Fano resonance is decomposed into the contributions of different multipole components. Based on the scattering power and electric field vector distribution, it can be found that the dielectric metamaterials λ 1Fano resonance with high Q value is mainly due to magnetic quadrupole and toroidal dipole, while λ 2Fano resonance has high Q value is mainly due to the toroidal dipole. Finally, the influence of nanopore side length and nanopore filling material on the two Fano resonances is analyzed and calculated. The research in this paper can provide theoretical guidance for the future research and preparation of high Q value optical response devices.

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