Asymmetric Cross Metasurfaces with Multiple Resonances Governed by Bound States in the Continuum
The bound state in the continuum (BIC) has paved a new way to achieve excellent localization of the resonant mode coexisting with a continuous spectrum in the metasurface. Here, we propose an all-dielectric metasurface consisting of periodic pairs of asymmetric crosses that supports multiple Fano re...
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MDPI AG
2023-03-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/16/6/2227 |
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| author | Hongjie Fan Jing Li Yuhang Sun Xueyu Wang Tiesheng Wu Yumin Liu |
| author_facet | Hongjie Fan Jing Li Yuhang Sun Xueyu Wang Tiesheng Wu Yumin Liu |
| author_sort | Hongjie Fan |
| collection | DOAJ |
| description | The bound state in the continuum (BIC) has paved a new way to achieve excellent localization of the resonant mode coexisting with a continuous spectrum in the metasurface. Here, we propose an all-dielectric metasurface consisting of periodic pairs of asymmetric crosses that supports multiple Fano resonances. Due to the sufficient degrees of freedom in the unit cell, we displaced the vertical bars horizontally to introduce in-plane perturbation, doubling the unit cell structure. Dimerization directly resulted in the folding of the Brillouin zone in k space and transformed the BIC modes into quasi-BIC resonances. Then, simultaneous in-plane symmetry breaking was introduced in both the x and y directions to excite two more resonances. The physical mechanisms of these BIC modes were investigated by multipole decomposition of the scattering cross section and electromagnetic near-field analysis, confirming that they are governed by toroidal dipole (TD) modes and magnetic dipole (MD) modes. We also investigated the flexible tunability and evaluated the sensing performance of our proposed metasurface. Our work is promising for different applications requiring stable and tunable resonances, such as optical switching and biomolecule sensing. |
| first_indexed | 2024-03-11T06:15:13Z |
| format | Article |
| id | doaj.art-4ba005d1b3b54301a8958ee6ef1cfcd1 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T06:15:13Z |
| publishDate | 2023-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-4ba005d1b3b54301a8958ee6ef1cfcd12023-11-17T12:19:15ZengMDPI AGMaterials1996-19442023-03-01166222710.3390/ma16062227Asymmetric Cross Metasurfaces with Multiple Resonances Governed by Bound States in the ContinuumHongjie Fan0Jing Li1Yuhang Sun2Xueyu Wang3Tiesheng Wu4Yumin Liu5State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, ChinaState Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, ChinaState Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, ChinaState Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, ChinaCollege of Information and Communication Engineering, Guilin University of Electronic Technology, Guilin 541004, ChinaState Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, ChinaThe bound state in the continuum (BIC) has paved a new way to achieve excellent localization of the resonant mode coexisting with a continuous spectrum in the metasurface. Here, we propose an all-dielectric metasurface consisting of periodic pairs of asymmetric crosses that supports multiple Fano resonances. Due to the sufficient degrees of freedom in the unit cell, we displaced the vertical bars horizontally to introduce in-plane perturbation, doubling the unit cell structure. Dimerization directly resulted in the folding of the Brillouin zone in k space and transformed the BIC modes into quasi-BIC resonances. Then, simultaneous in-plane symmetry breaking was introduced in both the x and y directions to excite two more resonances. The physical mechanisms of these BIC modes were investigated by multipole decomposition of the scattering cross section and electromagnetic near-field analysis, confirming that they are governed by toroidal dipole (TD) modes and magnetic dipole (MD) modes. We also investigated the flexible tunability and evaluated the sensing performance of our proposed metasurface. Our work is promising for different applications requiring stable and tunable resonances, such as optical switching and biomolecule sensing.https://www.mdpi.com/1996-1944/16/6/2227all-dielectric metasurfacebound state in the continuumoptical switchingsensing |
| spellingShingle | Hongjie Fan Jing Li Yuhang Sun Xueyu Wang Tiesheng Wu Yumin Liu Asymmetric Cross Metasurfaces with Multiple Resonances Governed by Bound States in the Continuum Materials all-dielectric metasurface bound state in the continuum optical switching sensing |
| title | Asymmetric Cross Metasurfaces with Multiple Resonances Governed by Bound States in the Continuum |
| title_full | Asymmetric Cross Metasurfaces with Multiple Resonances Governed by Bound States in the Continuum |
| title_fullStr | Asymmetric Cross Metasurfaces with Multiple Resonances Governed by Bound States in the Continuum |
| title_full_unstemmed | Asymmetric Cross Metasurfaces with Multiple Resonances Governed by Bound States in the Continuum |
| title_short | Asymmetric Cross Metasurfaces with Multiple Resonances Governed by Bound States in the Continuum |
| title_sort | asymmetric cross metasurfaces with multiple resonances governed by bound states in the continuum |
| topic | all-dielectric metasurface bound state in the continuum optical switching sensing |
| url | https://www.mdpi.com/1996-1944/16/6/2227 |
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