High-Performance Quality Factor Based Sensor With Diagonal Cylinder Metasurface of the Bound State in the Continuum  

作　　者：Yuxuan CHEN Yuke LI Zhengda HU Zexiang WANG Zhenxing LI Jicheng WANG 

机构地区：[1]School of Science,Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology,Jiangnan University,Wuxi 214122,China [2]State Key Laboratory of Millimeter Waves,Southeast University,Nanjing 210096,China

出　　处：《Photonic Sensors》2023年第2期89-98,共10页光子传感器（英文版）

基　　金：supported in part by the National Natural Science Foundation of China(Grant No.11811530052);Intergovernmental Scienceand Technology Regular Meeting Exchange Project of Ministry of Science and Technology of China(Grant No.CB02-20);Open Fund of State Key Laboratory of Applied Optics(Grant No.SKLA02020001A04);Undergraduate Research and Innovation Projects of China(Grant No.2021102Z).

摘　　要：High-quality-factor(high-Q-factor)electromagnetic resonance plays an important role in sensor applications.Previously proposed gas refractive index sensors are often limited by the large cavity length or microscale fabrication process in practical applications.Recently,ultra-high Q factor resonance based on the bound state in the continuum(BIC)has provided a feasible approach to solve these problems.In this paper,we propose a metasurface structure consisting of a single size tetramer cylinder.It supports dual band toroidal dipole(TD)resonances driven by BIC.The physical mechanism of double TD resonances is clarified by the multipole decomposition of the metasurface band structure and far-field scattering power.The sensor structure based on this achieves a sensitivity of 518.3 MHz/RIU,and the maximum line width does not exceed 680kHz.The high-Q-factor electromagnetic resonance has the advantages of polarization independence and simplicity to manufacture.These findings will open up an avenue to develop the ultrasensitive sensor in the gigahertz regime.

关 键 词：Metasurfaces bound state in the continuum toroidal dipole 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]