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.

补充资料

中图分类号：TN252

DOI：10.3788/aos201838.0224001

所属栏目：表面光学

基金项目：国家自然科学基金(61465004,61765004,61764001)、广西自然科学基金(2017GXNSFAA198164,2016GXNSFAA380006,2013GXNSFAA019338,2013GXNSFAA0199335)、桂林电子科技大学研究生教育创新计划(2016YJCX95, YJCX201522)、广西精密导航技术与应用重点实验室主任基金(DH201703, DH201702, DH201701)

收稿日期：2017-05-15

修改稿日期：2017-09-16

网络出版日期：--

作者单位    点击查看

联系人作者：肖功利(xgl.hy@126.com)

备注：肖功利(1975-), 男, 副教授, 主要从事微纳光电子器件与表面等离激元方面的研究。E-mail: xgl.hy@126.com

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Xiao Gongli,Liu Xiaogang,Yang Hongyan,Jiang Xingguo,Wang Hongqing,Zheng Long,Liu Li,Li Haiou,Li Qi,Zhang Fabi,Fu Tao,Chen Yonghe. Refractive Index Sensing Property Based on Extraordinary Optical Transmission of Metal Circular Arc Hole Array[J]. Acta Optica Sinica, 2018, 38(2): 0224001

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