High-Q Resonances Induced by Toroidal Dipole Bound States in the Continuum in Terahertz Metasurfaces
The radiation mode of the interaction between electromagnetic waves and materials has always been a research hotspot in nanophotonics, and bound states in the continuum (BICs) belong to one of the nonradiative modes. Owing to their high-quality factor characteristics, BICs are extensively employed i...
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2025-01-01
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| author | Lincheng Guo Yachen Gao |
| author_facet | Lincheng Guo Yachen Gao |
| author_sort | Lincheng Guo |
| collection | DOAJ |
| description | The radiation mode of the interaction between electromagnetic waves and materials has always been a research hotspot in nanophotonics, and bound states in the continuum (BICs) belong to one of the nonradiative modes. Owing to their high-quality factor characteristics, BICs are extensively employed in nonlinear harmonic generators and sensors. Here, the influence of structural parameters on radiation modes has been systematically analyzed using band theory; the mechanisms of quasi-BIC mode and BIC mode were also analyzed through multipole decomposition of scattered power and near-field distribution. Notably, this study presents the discovery that the toroidal dipole-BIC (TD-BIC) arises from the interference and cancellation of electric and toroidal dipoles. The research results indicate that the structure, which supports symmetry-protected BICs, is sensitive to variations in the concentration of NaCl solution in its surroundings, making it applicable for liquid detection in miniaturized metal sensors. The proposed scheme broadens the applicability of BIC-based sensors and provides a prospective platform for biological and chemical sensing. |
| format | Article |
| id | doaj-art-8081aa4f0d6441fba2ad6c3dfcc55fbf |
| institution | Kabale University |
| issn | 2073-4352 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
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| series | Crystals |
| spelling | doaj-art-8081aa4f0d6441fba2ad6c3dfcc55fbf2025-01-24T13:28:17ZengMDPI AGCrystals2073-43522025-01-011519610.3390/cryst15010096High-Q Resonances Induced by Toroidal Dipole Bound States in the Continuum in Terahertz MetasurfacesLincheng Guo0Yachen Gao1Electronic Engineering College, Heilongjiang University, Harbin 150080, ChinaElectronic Engineering College, Heilongjiang University, Harbin 150080, ChinaThe radiation mode of the interaction between electromagnetic waves and materials has always been a research hotspot in nanophotonics, and bound states in the continuum (BICs) belong to one of the nonradiative modes. Owing to their high-quality factor characteristics, BICs are extensively employed in nonlinear harmonic generators and sensors. Here, the influence of structural parameters on radiation modes has been systematically analyzed using band theory; the mechanisms of quasi-BIC mode and BIC mode were also analyzed through multipole decomposition of scattered power and near-field distribution. Notably, this study presents the discovery that the toroidal dipole-BIC (TD-BIC) arises from the interference and cancellation of electric and toroidal dipoles. The research results indicate that the structure, which supports symmetry-protected BICs, is sensitive to variations in the concentration of NaCl solution in its surroundings, making it applicable for liquid detection in miniaturized metal sensors. The proposed scheme broadens the applicability of BIC-based sensors and provides a prospective platform for biological and chemical sensing.https://www.mdpi.com/2073-4352/15/1/96toroidal dipoleTD-BICTHz metasurfacesensinghigh Q-factor |
| spellingShingle | Lincheng Guo Yachen Gao High-Q Resonances Induced by Toroidal Dipole Bound States in the Continuum in Terahertz Metasurfaces Crystals toroidal dipole TD-BIC THz metasurface sensing high Q-factor |
| title | High-Q Resonances Induced by Toroidal Dipole Bound States in the Continuum in Terahertz Metasurfaces |
| title_full | High-Q Resonances Induced by Toroidal Dipole Bound States in the Continuum in Terahertz Metasurfaces |
| title_fullStr | High-Q Resonances Induced by Toroidal Dipole Bound States in the Continuum in Terahertz Metasurfaces |
| title_full_unstemmed | High-Q Resonances Induced by Toroidal Dipole Bound States in the Continuum in Terahertz Metasurfaces |
| title_short | High-Q Resonances Induced by Toroidal Dipole Bound States in the Continuum in Terahertz Metasurfaces |
| title_sort | high q resonances induced by toroidal dipole bound states in the continuum in terahertz metasurfaces |
| topic | toroidal dipole TD-BIC THz metasurface sensing high Q-factor |
| url | https://www.mdpi.com/2073-4352/15/1/96 |
| work_keys_str_mv | AT linchengguo highqresonancesinducedbytoroidaldipoleboundstatesinthecontinuuminterahertzmetasurfaces AT yachengao highqresonancesinducedbytoroidaldipoleboundstatesinthecontinuuminterahertzmetasurfaces |