Switchable magnetic dipole assisted double QBICs in an asymmetry four-leaf clover-shaped Ge2Sb2Te5 metasurface
Dynamically tunable metasurface resonators with high Q factors and excellent sensing performance still lack research. This paper proposes a dual-band symmetry broken induced quasi bound state in the continuum (QBIC) sensor in the near-infrared region based on an asymmetric four-leaf clover-shaped Ge...
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Elsevier
2023-09-01
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| Series: | Results in Physics |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2211379723006940 |
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| author | Rujun Zhou Si Luo Jingyi Tian Yusheng Zhang Chenning Tao Qiang Ling Daru Chen |
| author_facet | Rujun Zhou Si Luo Jingyi Tian Yusheng Zhang Chenning Tao Qiang Ling Daru Chen |
| author_sort | Rujun Zhou |
| collection | DOAJ |
| description | Dynamically tunable metasurface resonators with high Q factors and excellent sensing performance still lack research. This paper proposes a dual-band symmetry broken induced quasi bound state in the continuum (QBIC) sensor in the near-infrared region based on an asymmetric four-leaf clover-shaped Ge2Sb2Te5 (GST) metasurface. The high-quality transmission spectrum can be tuned by switching the GST crystalline state. Two QBIC magnetic dipole resonances are excited at the amorphous GST state, QBIC Ⅰ (intracavity MD mode) and QBIC Ⅱ (intercavity high-order MD mode). Based on theoretical simulation, the refractive index sensitivity of the QBIC Ⅱ mode (318.05 nm/RIU) is enhanced higher than twice of the QBIC Ⅰ mode (134.03 nm/RIU) owing to the unique electromagnetic field properties. The ultra-high Q factors generated by the two MD resonance modes are 1.1 × 105 (QBIC Ⅰ) and 1.71 × 105 (QBIC Ⅱ) respectively for a small perturbation of the air hole offset distance D = 5 nm. By discussing the effect of the main structure parameters and the analyte thickness on the sensitivity, the optimal parameters are determined. The two strong QBICs supported by the a-GST metasurface are stable when the air hole’s offset from the unit center is at different directions and distances, indicating a good tolerance to fabrication requirements. These results provide a competitive switchable dual-band QBIC metasurface sensor, providing a potential route for tunable metadevices for functional sensing and dynamic control over signals. |
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| format | Article |
| id | doaj.art-aec9a348b2a741069e9560e6d6e9b456 |
| institution | Directory Open Access Journal |
| issn | 2211-3797 |
| language | English |
| last_indexed | 2024-03-12T00:05:26Z |
| publishDate | 2023-09-01 |
| publisher | Elsevier |
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| series | Results in Physics |
| spelling | doaj.art-aec9a348b2a741069e9560e6d6e9b4562023-09-17T04:56:41ZengElsevierResults in Physics2211-37972023-09-0152106901Switchable magnetic dipole assisted double QBICs in an asymmetry four-leaf clover-shaped Ge2Sb2Te5 metasurfaceRujun Zhou0Si Luo1Jingyi Tian2Yusheng Zhang3Chenning Tao4Qiang Ling5Daru Chen6Hangzhou Institute of Advanced Studies, Zhejiang Normal University, Hangzhou 311231, China; Key Laboratory of Optical Information Detection and Display Technology of Zhejiang, Zhejiang Normal University, Jinhua 321004, ChinaHangzhou Institute of Advanced Studies, Zhejiang Normal University, Hangzhou 311231, China; Key Laboratory of Optical Information Detection and Display Technology of Zhejiang, Zhejiang Normal University, Jinhua 321004, China; Corresponding authors.Centre for Disruptive Photonic Technologies, TPI, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore; Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371, SingaporeHangzhou Institute of Advanced Studies, Zhejiang Normal University, Hangzhou 311231, China; Key Laboratory of Optical Information Detection and Display Technology of Zhejiang, Zhejiang Normal University, Jinhua 321004, ChinaHangzhou Institute of Advanced Studies, Zhejiang Normal University, Hangzhou 311231, China; Key Laboratory of Optical Information Detection and Display Technology of Zhejiang, Zhejiang Normal University, Jinhua 321004, ChinaHangzhou Institute of Advanced Studies, Zhejiang Normal University, Hangzhou 311231, China; Key Laboratory of Optical Information Detection and Display Technology of Zhejiang, Zhejiang Normal University, Jinhua 321004, ChinaHangzhou Institute of Advanced Studies, Zhejiang Normal University, Hangzhou 311231, China; Key Laboratory of Optical Information Detection and Display Technology of Zhejiang, Zhejiang Normal University, Jinhua 321004, China; Corresponding authors.Dynamically tunable metasurface resonators with high Q factors and excellent sensing performance still lack research. This paper proposes a dual-band symmetry broken induced quasi bound state in the continuum (QBIC) sensor in the near-infrared region based on an asymmetric four-leaf clover-shaped Ge2Sb2Te5 (GST) metasurface. The high-quality transmission spectrum can be tuned by switching the GST crystalline state. Two QBIC magnetic dipole resonances are excited at the amorphous GST state, QBIC Ⅰ (intracavity MD mode) and QBIC Ⅱ (intercavity high-order MD mode). Based on theoretical simulation, the refractive index sensitivity of the QBIC Ⅱ mode (318.05 nm/RIU) is enhanced higher than twice of the QBIC Ⅰ mode (134.03 nm/RIU) owing to the unique electromagnetic field properties. The ultra-high Q factors generated by the two MD resonance modes are 1.1 × 105 (QBIC Ⅰ) and 1.71 × 105 (QBIC Ⅱ) respectively for a small perturbation of the air hole offset distance D = 5 nm. By discussing the effect of the main structure parameters and the analyte thickness on the sensitivity, the optimal parameters are determined. The two strong QBICs supported by the a-GST metasurface are stable when the air hole’s offset from the unit center is at different directions and distances, indicating a good tolerance to fabrication requirements. These results provide a competitive switchable dual-band QBIC metasurface sensor, providing a potential route for tunable metadevices for functional sensing and dynamic control over signals.http://www.sciencedirect.com/science/article/pii/S2211379723006940Ge2Sb2Te5MetasurfaceBound state in the continuumSensingOptical switch |
| spellingShingle | Rujun Zhou Si Luo Jingyi Tian Yusheng Zhang Chenning Tao Qiang Ling Daru Chen Switchable magnetic dipole assisted double QBICs in an asymmetry four-leaf clover-shaped Ge2Sb2Te5 metasurface Results in Physics Ge2Sb2Te5 Metasurface Bound state in the continuum Sensing Optical switch |
| title | Switchable magnetic dipole assisted double QBICs in an asymmetry four-leaf clover-shaped Ge2Sb2Te5 metasurface |
| title_full | Switchable magnetic dipole assisted double QBICs in an asymmetry four-leaf clover-shaped Ge2Sb2Te5 metasurface |
| title_fullStr | Switchable magnetic dipole assisted double QBICs in an asymmetry four-leaf clover-shaped Ge2Sb2Te5 metasurface |
| title_full_unstemmed | Switchable magnetic dipole assisted double QBICs in an asymmetry four-leaf clover-shaped Ge2Sb2Te5 metasurface |
| title_short | Switchable magnetic dipole assisted double QBICs in an asymmetry four-leaf clover-shaped Ge2Sb2Te5 metasurface |
| title_sort | switchable magnetic dipole assisted double qbics in an asymmetry four leaf clover shaped ge2sb2te5 metasurface |
| topic | Ge2Sb2Te5 Metasurface Bound state in the continuum Sensing Optical switch |
| url | http://www.sciencedirect.com/science/article/pii/S2211379723006940 |
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