太赫兹辐射
激发态
太赫兹超材料
对称性破坏
物理
对称(几何)
凝聚态物理
光电子学
光学
原子物理学
量子力学
数学
几何学
远红外激光器
激光器
作者
Kai He,Qiang Niu,Yinong Xie,Shaoqiu Xiao,Yuping Yang,Zhu Jin-feng
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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