Bound state in the continuum (BIC) excited by the metasurface breaking in-plane symmetry and quasi-BIC for terahertz sensing

被引:0
|
作者
He, Kai [1 ]
Niu, Qiang [2 ]
Xie, Yinong [2 ]
Xiao, Shaoqiu [3 ]
Yang, Yuping [4 ]
Zhu, Jinfeng [2 ]
机构
[1] Univ Elect Sci & Technol China, Sch Phys, Chengdu 610054, Peoples R China
[2] Xiamen Univ, Inst Electromagnet & Acoust, Natl Model Microelect Coll, Sch Elect Sci & Engn, Xiamen 361005, Peoples R China
[3] Sun Yat Sen Univ, Sch Syst Sci & Engn, Guangzhou 510275, Peoples R China
[4] Minzu Univ China, Sch Sci, Beijing 100081, Peoples R China
基金
中国国家自然科学基金;
关键词
RESONANCES; LIGHT;
D O I
10.1063/5.0214038
中图分类号
O59 [应用物理学];
学科分类号
摘要
Bound state in the continuum (BIC), generally realized by structures with in-plane symmetry, has been under the spotlight in the control of the electromagnetic field. This Letter presents a terahertz metasurface that possesses broken in-plane symmetry for exciting BIC. The switch from a BIC to a quasi-BIC can be achieved through parameter modulation. According to multipolar decomposition, the BIC is constructed by the destructive interference of far-field radiation originating from the electric dipole and magnetic quadrupole. More importantly, considering that the metal material has finite conductivity, we analyze the relationship between radiation and non-radiation losses, based on the time domain coupled mode theory, which provides substantial theoretical support for the investigation of BIC phenomena. Furthermore, the proposed metasurface exciting quasi-BIC is highly sensitive to the changes in the dielectric environment, resulting in a high sensitivity of 135 GHz/RIU and a distinction between sucrose and glucose with the same solid content. As a result, our research provides a theoretical explanation of the evolution of BIC excited by the structure with broken in-plane symmetry and promotes the development of the high-performance meta-device used for sensing.
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页数:6
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