【摘要】 利用镜像对称的方形双开口环结构设计制备了一款太赫兹环偶极子超材料传感器,该传感器在1.436 THz处产生Q值为16.8的透射谐振谷。谐振频率处结构表面电流分析表明,该结构能在抑制电偶极子和磁偶极子的同时迅速增强环偶极子。作为生物传感器,该器件在分析物厚度饱和时灵敏度高达348.8 GHz/RIU,可以高灵敏感测表面介电环境的微小变化。实验结果验证了其对标准食用油和劣质地沟油的良好分辨性,表明该器件在食品安全监测等方面有着潜在的应用前景。更多还原

【Abstract】 A terahertz toroidal dipole metamaterial sensor based on mirror symmetric square ring structure with double split is designed and fabricated, and a transmission resonant valley with a Q value of 16.8 at 1.436 THz can be provided by the sensor. The surface current analysis of the structure at resonant frequency shows that the device can rapidly strengthen the toroidal dipole while suppressing the electric dipole and magnetic dipole. As a toroidal dipole metamaterial biosensor, the device has a sensitivity of up to 348.8 GHz/RIU when the analyte thickness is saturated, and can sensitively detect the small changes of the surface dielectric environment. The experimental results have demonstrated the perfect resolutions for discrimination between standard edible oil and gutter oil, indicating its great application prospects in food safety monitoring.更多还原