Plasmonic Refractive Index Sensor with High Figure of Merit Based on Concentric-Rings Resonator

Sensors

Yunxin Han¹  Xin He¹  Junbo Yang¹  Jie Huang²  Zhaojian Zhang²  Jingjing Zhang²  Dingbo Chen² 

[1] Center of Material Science, National University of Defense Technology, Changsha 410073, China;College of Liberal Arts and Sciences, National University of Defense Technology, Changsha 410073, China;

关键词: plasmonic sensor;    high figure of merit;    concentric double rings resonator;   

DOI  :  10.3390/s18010116

来源: DOAJ

【 摘 要 】

A plasmonic refractive index (RI) sensor based on metal-insulator-metal (MIM) waveguide coupled with concentric double rings resonator (CDRR) is proposed and investigated numerically. Utilizing the novel supermodes of the CDRR, the FWHM of the resonant wavelength can be modulated, and a sensitivity of 1060 nm/RIU with high figure of merit (FOM) 203.8 is realized in the near-infrared region. The unordinary modes, as well as the influence of structure parameters on the sensing performance, are also discussed. Such plasmonic sensor with simple framework and high optical resolution could be applied to on-chip sensing systems and integrated optical circuits. Besides, the special cases of bio-sensing and triple rings are also discussed.

【 授权许可】

Unknown