光学学报, 2019, 39 (1): 0104001, 网络出版: 2019-05-10
多圆孔周期性银膜阵列结构的光学特性 下载: 1253次
Optical Properties of Multi-Hole Periodic Silver Film Array Structure
传感器 周期性阵列结构 局部表面等离子体共振 表面等离激元 异常透射现象 sensors periodic array structure localized surface plasmon resonance surface plasmon polaritons extraordinary optical transmission
摘要
提出一种多圆孔周期性银膜阵列结构,并利用时域有限差分算法探究该结构的光学特性。计算结果表明,当线性偏振光入射时,该结构表面激发出表面等离激元,且纳米孔间产生了局部表面等离子体共振,使得该结构的异常透射增强。针对这一现象,通过对中心孔与边孔所呈角度、入射光偏振角度、结构参数(中心孔直径、边孔直径、结构厚度、边孔与中心孔的间距)的调控来实现结构光学透射属性的优化。此外,分析所提结构在不同环境折射率条件下透射峰的变化规律, 发现该结构也对周围的环境折射率具有较高的敏感度。因此该结构在表面等离激元滤波器和折射率传感器中具有广泛的应用前景。
Abstract
We propose a multi-hole periodic silver film array structure and explore the optical properties of the proposed structure using the finite-difference time-domain method. Simulation results reveal that when linearly polarized light is incident on the metal surface, the structure possesses extraordinary optical transmission due to the excitation of the surface plasmon polaritons and localized surface plasmon resonances. In view of this phenomenon, the optical transmission property of the proposed structure is further optimized by the angle between the central hole and side holes, polarization angle of the incident light, and structural parameters (i.e., diameters of the central hole and side holes, structural thickness, space between side holes and central hole). Further analysis of the variation of the transmission peak under different refractive indices shows that the structure has a high sensitivity to the refractive index of the surrounding environment. Thus, the proposed structure has potential applications in surface plasma filters and refractive index sensors.
潘庭婷, 曹文, 王鸣. 多圆孔周期性银膜阵列结构的光学特性[J]. 光学学报, 2019, 39(1): 0104001. Tingting Pan, Wen Cao, Ming Wang. Optical Properties of Multi-Hole Periodic Silver Film Array Structure[J]. Acta Optica Sinica, 2019, 39(1): 0104001.