Hu Haitao, Lu Xue, Huang Jianhua, Chen Kai, Su Jun, Yan Zhendong, Tang Chaojun, Cai Pingen
Department of Physical Education, Nanjing Forestry University, Nanjing 210037, China.
Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control (AEMPC), Nanjing University of Information Science & Technology, Nanjing 210044, China.
Nanomaterials (Basel). 2021 Dec 11;11(12):3361. doi: 10.3390/nano11123361.
We theoretically demonstrate an approach to generate the double narrow Fano resonances via diffraction coupling of magnetic plasmon (MP) resonances by embedding 3D metamaterials composed of vertical Au U-shaped split-ring resonators (VSRRs) array into a dielectric substrate. Our strategy offers a homogeneous background allowing strong coupling between the MP resonances of VSRRs and the two surface collective optical modes of a periodic array resulting from Wood anomaly, which leads to two narrow hybridized MP modes from the visible to near-infrared regions. In addition, the interaction effects in the VSRRs with various geometric parameters are also systematically studied. Owing to the narrow hybrid MP mode being highly sensitive to small changes in the surrounding media, the sensitivity and the figure of merit () of the embedded 3D metamaterials with fabrication feasibility were as high as 590 nm/RIU and 104, respectively, which holds practical applications in label-free biosensing, such as the detection of medical diagnoses and sport doping drugs.
我们从理论上证明了一种通过将由垂直金U形开口环谐振器（VSRR）阵列组成的三维超材料嵌入介电基片中，利用磁等离子体（MP）谐振的衍射耦合来产生双窄法诺共振的方法。我们的策略提供了一个均匀的背景，使得VSRR的MP谐振与由伍德异常产生的周期性阵列的两个表面集体光学模式之间能够实现强耦合，从而在可见光到近红外区域产生两个窄的杂化MP模式。此外，还系统地研究了具有各种几何参数的VSRR中的相互作用效应。由于窄杂化MP模式对周围介质的微小变化高度敏感，具有制造可行性的嵌入式三维超材料的灵敏度和品质因数分别高达590 nm/RIU和104，这在无标记生物传感中具有实际应用，如医学诊断和运动兴奋剂药物的检测。
