光子学报, 2017, 46 (4): 0413002, 网络出版: 2017-05-03
基于耦合开口方环共振空腔的可控法诺共振研究
Controllable Fano Resonance Based on Coupled Square Split-Ring Resonance Cavity
表面等离子激元 开口方环谐振腔 法诺共振 介质波导 传输谱 品质因数 光学传感与传感器 Surface plasmon polaritons Square split-ring resonance cavity Fano resonance Dielectric waveguide Transmission spectra Figure of merit Optical sensing and sensors
摘要
基于表面等离子激元理论与金属-介质-金属波导结构提出一个由开口方环共振空腔、挡板及MIM波导组成的波导结构, 并使用有限元方法系统地研究了该结构的透射特性.仿真计算结果表明:该结构可以产生法诺共振现象, 其共振波长可以通过改变开口方环空腔的长度及开口大小进行调节, 该结构敏感度可达1 600 nm/RIU,品质因数为1.31×105.此外, 通过调整方环共振空腔上开口的位置, 在波导中产生了双重法诺共振现象, 其敏感度可达1 700 nm/RIU, 品质因数为8.3×104.该结构有望在光学集成回路, 尤其是纳米生物传感器方面得到比较广泛的应用.
Abstract
Based on the theory of Surface Plasmon Polaritons(SPPs) and the Metal-Insulator-Metal(MIM) waveguide structure, a waveguide structure was proposed, which consists of a square split-ring resonance cavity, a baffle and a MIM waveguide. The transmission characteristics of this structure is calculated by using the Finite-Element Method(FEM).The simulation results show a Fano resonance in the transmission spectra, and the resonant wavelength can be easily tuned by changing the length of the square split-ring resonance cavity or the width of the split. The sensitivity and the figure of merit of this structure is 1 600 nm/RIU and 1.3×105 separately. By changing the position of the split, double Fano resonances can be observed in the waveguide with a sensitivity of 1 700 nm/RIU and the figure of merit of 8.3×104 respectively. The waveguide structure may have wide applications in highly integrated optical circuits , especially for nano bio-sensor.
石悦, 张冠茂, 安厚霖, 胡南, 顾梦琪. 基于耦合开口方环共振空腔的可控法诺共振研究[J]. 光子学报, 2017, 46(4): 0413002. SHI Yue, ZHANG Guan-mao, AN Hou-lin, HU Nan, GU Meng-qi. Controllable Fano Resonance Based on Coupled Square Split-Ring Resonance Cavity[J]. ACTA PHOTONICA SINICA, 2017, 46(4): 0413002.