Asymmetric Orthogonal Metasurfaces Governed by Toroidal Dipole Bound States in the Continuum
An all-dielectric metasurface composed of orthogonal-slit silicon disks is proposed in this study. By modifying the unit structure of the metasurface with the bound states in the continuum (BICs), a sharp Fano resonance can be generated. The resonance properties of the metasurface are investigated b...
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MDPI AG
2023-10-01
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| Series: | Photonics |
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| Online Access: | https://www.mdpi.com/2304-6732/10/11/1194 |
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| author | Jun Ji Xiaolong Lv Chuanfei Li Xiaoyuan Yang Yunsheng Guo |
| author_facet | Jun Ji Xiaolong Lv Chuanfei Li Xiaoyuan Yang Yunsheng Guo |
| author_sort | Jun Ji |
| collection | DOAJ |
| description | An all-dielectric metasurface composed of orthogonal-slit silicon disks is proposed in this study. By modifying the unit structure of the metasurface with the bound states in the continuum (BICs), a sharp Fano resonance can be generated. The resonance properties of the metasurface are investigated by analyzing the effects of the structural parameters on the resonance using the eigenmode analysis method. The Q factor and the resonance wavelength can be adjusted by varying the slit width, the disk thickness, and the disk radius. The electromagnetic characteristics and mechanism of the toroidal dipole BICs (TD-BICs) are explored in depth through an analysis of the multipole expansion of the scattered power, along with the electromagnetic field and the current distribution at resonance. This research provides a novel approach for the excitation of strong TD-BIC resonance and proposes potential applications in optical switches, high-sensitivity optical sensors, and related areas. |
| first_indexed | 2024-03-09T16:31:06Z |
| format | Article |
| id | doaj.art-1b5b71907bf04fce9e4430326b0b3fc8 |
| institution | Directory Open Access Journal |
| issn | 2304-6732 |
| language | English |
| last_indexed | 2024-03-09T16:31:06Z |
| publishDate | 2023-10-01 |
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| series | Photonics |
| spelling | doaj.art-1b5b71907bf04fce9e4430326b0b3fc82023-11-24T15:01:19ZengMDPI AGPhotonics2304-67322023-10-011011119410.3390/photonics10111194Asymmetric Orthogonal Metasurfaces Governed by Toroidal Dipole Bound States in the ContinuumJun Ji0Xiaolong Lv1Chuanfei Li2Xiaoyuan Yang3Yunsheng Guo4School of Science, Inner Mongolia University of Science and Technology, Baotou 518060, ChinaSchool of Science, Inner Mongolia University of Science and Technology, Baotou 518060, ChinaSchool of Science, Inner Mongolia University of Science and Technology, Baotou 518060, ChinaSchool of Science, Inner Mongolia University of Science and Technology, Baotou 518060, ChinaSchool of Science, Inner Mongolia University of Science and Technology, Baotou 518060, ChinaAn all-dielectric metasurface composed of orthogonal-slit silicon disks is proposed in this study. By modifying the unit structure of the metasurface with the bound states in the continuum (BICs), a sharp Fano resonance can be generated. The resonance properties of the metasurface are investigated by analyzing the effects of the structural parameters on the resonance using the eigenmode analysis method. The Q factor and the resonance wavelength can be adjusted by varying the slit width, the disk thickness, and the disk radius. The electromagnetic characteristics and mechanism of the toroidal dipole BICs (TD-BICs) are explored in depth through an analysis of the multipole expansion of the scattered power, along with the electromagnetic field and the current distribution at resonance. This research provides a novel approach for the excitation of strong TD-BIC resonance and proposes potential applications in optical switches, high-sensitivity optical sensors, and related areas.https://www.mdpi.com/2304-6732/10/11/1194metasurfaceall-dielectric metasurfacebound states in the continuumTD-BICsFano resonanceQ factor |
| spellingShingle | Jun Ji Xiaolong Lv Chuanfei Li Xiaoyuan Yang Yunsheng Guo Asymmetric Orthogonal Metasurfaces Governed by Toroidal Dipole Bound States in the Continuum Photonics metasurface all-dielectric metasurface bound states in the continuum TD-BICs Fano resonance Q factor |
| title | Asymmetric Orthogonal Metasurfaces Governed by Toroidal Dipole Bound States in the Continuum |
| title_full | Asymmetric Orthogonal Metasurfaces Governed by Toroidal Dipole Bound States in the Continuum |
| title_fullStr | Asymmetric Orthogonal Metasurfaces Governed by Toroidal Dipole Bound States in the Continuum |
| title_full_unstemmed | Asymmetric Orthogonal Metasurfaces Governed by Toroidal Dipole Bound States in the Continuum |
| title_short | Asymmetric Orthogonal Metasurfaces Governed by Toroidal Dipole Bound States in the Continuum |
| title_sort | asymmetric orthogonal metasurfaces governed by toroidal dipole bound states in the continuum |
| topic | metasurface all-dielectric metasurface bound states in the continuum TD-BICs Fano resonance Q factor |
| url | https://www.mdpi.com/2304-6732/10/11/1194 |
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