光学学报, 2018, 38 (2): 0224001, 网络出版: 2018-08-30
基于金属圆弧孔阵列强透射的折射率传感特性 下载: 1025次
Refractive Index Sensing Property Based on Extraordinary Optical Transmission of Metal Circular Arc Hole Array
表面光学 折射率传感特性 有限时域差分法 金属圆弧孔阵列 强透射 法布里-珀罗腔 表面等离激元 optics at surfaces refractive index sensing property finite-difference time-domain method metal circular arc hole array extraordinary optical transmission Fabry-Perot cavity surface plasmon polariton
摘要
提出了一种由左右、上下对称的一大一小圆弧组成的金属圆弧孔阵列结构。利用该结构形成的法布里-珀罗腔来加强表面等离激元的耦合作用,以获得较好的强透射现象;同时研究了基于该现象的折射率传感特性。采用有限时域差分法研究了该孔阵列结构中大小圆弧孔的半径、两圆弧的圆心距和阵列周期对强透射现象的影响。研究发现,当大圆弧半径为95 nm、小圆弧半径为70 nm、两圆弧的圆心距为100 nm、周期为425 nm时,该结构具有较好的强透射现象,其灵敏度为279 nm/RIU,为下一代高性能微纳米等离子体传感器的设计提供了理论参考。
Abstract
The metal circular arc hole array structure consisting of two symmetrical large and small circular arcs, at the positions of up and down, left and right, is proposed. In order to obtain an extraordinary optical transmission phenomenon, we use Fabry-Perot cavity formed by the structure to enhance the coupling of surface plasmon polariton (SPP). At the same time, a refractive index sensing property is investigated based on the phenomenon. The effects of the radiuses of big and small circular arc holes, the center distance of two circular arcs and the array period on extraordinary optical transmission phenomenon are investigated with the utilization of finite-difference time-domain (FDTD) method. It is found that when the radius of the big and small circular arcs are 95 nm and 70 nm, respectively, the center distance of the two circular arcs is 100 nm and the period is 425 nm, this structure has an extraordinary optical transmission phenomenon and its sensitivity is 279 nm/RIU. These results serve as a theory reference for the design of next-generation high-performance micro-nano plasmonics sensors.
肖功利, 刘小刚, 杨宏艳, 蒋行国, 王宏庆, 郑龙, 刘利, 李海鸥, 李琦, 张法碧, 傅涛, 陈永和. 基于金属圆弧孔阵列强透射的折射率传感特性[J]. 光学学报, 2018, 38(2): 0224001. Gongli Xiao, Xiaogang Liu, Hongyan Yang, Xingguo Jiang, Hongqing Wang, Long Zheng, Li Liu, Haiou Li, Qi Li, Fabi Zhang, Tao Fu, Yonghe Chen. Refractive Index Sensing Property Based on Extraordinary Optical Transmission of Metal Circular Arc Hole Array[J]. Acta Optica Sinica, 2018, 38(2): 0224001.