摘要
提出了一种基于非对称圆环槽和圆环狭缝的干涉型表面等离激元传感器,设计了结构,通过时域有限差分法(FDTD)研究了其干涉光谱和传感原理,得到了仿真结果和光学响应特性。该结构主要利用非对称半圆环凹槽-环形狭缝的结构,形成两干涉臂、四光束干涉的表面等离激元传感器。作为非对称圆环槽-圆孔干涉仪和线性槽-缝-槽干涉仪的一般化结构,非对称圆环槽-圆环狭缝(S-Gs)干涉仪有更强的光透射和更好的传感特性,传感灵敏度最高为线性槽-缝-槽干涉仪的10倍。仿真结果证实了该干涉光谱随环境折射率变化偏移,展现了良好的传感特性,有助于微型生化传感器的发展。
The design, simulation, and characterization of a plasmonic interferometeric sen- sor was reported, which consisted of concentric semicircular grooves and circular slit patterned on a gold film. This structure was proposed to form two-arm, four-beam, planar plasmonic interfer ometers. Laying in-between the semicircular grooves ＆ aperture and the linear groove-slit-groove interferometers, the circular slit ＆ semicircular grooves interferometer shows higher light trans mission and enhanced sensitivity. Compared with a linear groove-slit-groove plasmonic interfer ometer, the circular slit ＆ semicircular grooves plasmonic interferometer could achieve lO-fold higher sensitivity. The simulated results show that this simple, efficient, and controllable scheme possesses unique features of high contrast, narrow linewidth, and large amplitude, which is promising for the development of multispectral and extremely compact bio-chemical sensors.
作者
杜澜
王鸣
邓彩松
郭余庆
潘庭婷
黄燕
DU Lan;WANG Ming;DENG Caisong;GUO Yuqing;PAN Tingting;HUANG Yan(Key Laboratory on Opto-Electronic Technology of Jiangsu Province,Nanjing Normal University,Nanjing 210023,CHN)
出处
《光电子技术》
CAS
北大核心
2018年第2期89-95,共7页
Optoelectronic Technology
基金
江苏省自然科学基金(BK20161559)
江苏省高校自然科学研究项目(16KJB510018)
江苏省高校研究生培养创新工程(KYLX16_1289)
关键词
表面等离激元
干涉
纳米结构
surface plasmon polariton
interference
nanostructure
