Theoretical Study on All-Dielectric Elliptic Cross Metasurface Sensor Governed by Bound States in the Continuum
The appearance of all-dielectric micro–nano photonic devices constructed from high refractive index dielectric materials offers a low-loss platform for the manipulation of electromagnetic waves. The manipulation of electromagnetic waves by all-dielectric metasurfaces reveals unprecedented potential,...
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| Format: | Article |
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MDPI AG
2023-03-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/5/2113 |
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| author | Haocheng Cai Xiaoxu Yu Luhong Mao |
| author_facet | Haocheng Cai Xiaoxu Yu Luhong Mao |
| author_sort | Haocheng Cai |
| collection | DOAJ |
| description | The appearance of all-dielectric micro–nano photonic devices constructed from high refractive index dielectric materials offers a low-loss platform for the manipulation of electromagnetic waves. The manipulation of electromagnetic waves by all-dielectric metasurfaces reveals unprecedented potential, such as focusing electromagnetic waves and generating structured light. Recent advances in dielectric metasurfaces are associated with bound states in the continuum, which can be described as non-radiative eigen modes above the light cone supported by metasurfaces. Here, we propose an all-dielectric metasurface composed of elliptic cross pillars arranged periodically and verify that the displacement distance of a single elliptic pillar can control the strength of the light–matter interaction. Specifically, when the elliptic cross pillar is C<sub>4</sub> symmetric, the quality factor of the metasurface at the Γ point is infinite, also called the bound states in the continuum. Once the C<sub>4</sub> symmetry is broken by moving a single elliptic pillar, the corresponding metasurface engenders mode leakage; however, the large quality factor still exists, which is called the quasi-bound states in the continuum. Then, it is verified by simulation that the designed metasurface is sensitive to the refractive index change of the surrounding medium, indicating that it can be applied for refractive index sensing. Moreover, combined with the specific frequency and the refractive index variation of the medium around the metasurface, the information encryption transmission can be realized effectively. Therefore, we envisage that the designed all-dielectric elliptic cross metasurface can promote the development of miniaturized photon sensors and information encoders due to its sensitivity. |
| first_indexed | 2024-03-11T07:18:28Z |
| format | Article |
| id | doaj.art-4cd9c29c60424bdc8d5a8f7a3dce1996 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T07:18:28Z |
| publishDate | 2023-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-4cd9c29c60424bdc8d5a8f7a3dce19962023-11-17T08:07:30ZengMDPI AGMaterials1996-19442023-03-01165211310.3390/ma16052113Theoretical Study on All-Dielectric Elliptic Cross Metasurface Sensor Governed by Bound States in the ContinuumHaocheng Cai0Xiaoxu Yu1Luhong Mao2School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, ChinaTianjin Navigation Instrument Research Institute, Tianjin 300131, ChinaSchool of Electrical and Information Engineering, Tianjin University, Tianjin 300072, ChinaThe appearance of all-dielectric micro–nano photonic devices constructed from high refractive index dielectric materials offers a low-loss platform for the manipulation of electromagnetic waves. The manipulation of electromagnetic waves by all-dielectric metasurfaces reveals unprecedented potential, such as focusing electromagnetic waves and generating structured light. Recent advances in dielectric metasurfaces are associated with bound states in the continuum, which can be described as non-radiative eigen modes above the light cone supported by metasurfaces. Here, we propose an all-dielectric metasurface composed of elliptic cross pillars arranged periodically and verify that the displacement distance of a single elliptic pillar can control the strength of the light–matter interaction. Specifically, when the elliptic cross pillar is C<sub>4</sub> symmetric, the quality factor of the metasurface at the Γ point is infinite, also called the bound states in the continuum. Once the C<sub>4</sub> symmetry is broken by moving a single elliptic pillar, the corresponding metasurface engenders mode leakage; however, the large quality factor still exists, which is called the quasi-bound states in the continuum. Then, it is verified by simulation that the designed metasurface is sensitive to the refractive index change of the surrounding medium, indicating that it can be applied for refractive index sensing. Moreover, combined with the specific frequency and the refractive index variation of the medium around the metasurface, the information encryption transmission can be realized effectively. Therefore, we envisage that the designed all-dielectric elliptic cross metasurface can promote the development of miniaturized photon sensors and information encoders due to its sensitivity.https://www.mdpi.com/1996-1944/16/5/2113metasurfacesensorbound states in the continuuminformation encoding |
| spellingShingle | Haocheng Cai Xiaoxu Yu Luhong Mao Theoretical Study on All-Dielectric Elliptic Cross Metasurface Sensor Governed by Bound States in the Continuum Materials metasurface sensor bound states in the continuum information encoding |
| title | Theoretical Study on All-Dielectric Elliptic Cross Metasurface Sensor Governed by Bound States in the Continuum |
| title_full | Theoretical Study on All-Dielectric Elliptic Cross Metasurface Sensor Governed by Bound States in the Continuum |
| title_fullStr | Theoretical Study on All-Dielectric Elliptic Cross Metasurface Sensor Governed by Bound States in the Continuum |
| title_full_unstemmed | Theoretical Study on All-Dielectric Elliptic Cross Metasurface Sensor Governed by Bound States in the Continuum |
| title_short | Theoretical Study on All-Dielectric Elliptic Cross Metasurface Sensor Governed by Bound States in the Continuum |
| title_sort | theoretical study on all dielectric elliptic cross metasurface sensor governed by bound states in the continuum |
| topic | metasurface sensor bound states in the continuum information encoding |
| url | https://www.mdpi.com/1996-1944/16/5/2113 |
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