Author Affiliations
Abstract
College of Electronic Engineering, Heilongjiang University, Harbin 150080, China
Extraordinary optical transmission (EOT) in subwavelength metal structures has been studied widely. Herein, we propose a strategy for tuning the EOT of the bullseye structure. Specifically, the bullseye structure was immersed in a nonlinear medium, and a controlling light was employed to change the refractive index of the medium. At different intensities and distributions of controlling light, the transmission property of signal light in the bullseye structure was simulated. The results show that a variable transmission spectrum in the bullseye structure can be realized. Moreover, the position of the central transmission peak shifts linearly with the increasing intensity of controlling light.
230.3990 Micro-optical devices 130.6010 Sensors Chinese Optics Letters
2019, 17(12): 122302
1 黑龙江大学电子工程学院，黑龙江 哈尔滨 150080
2 辽宁省朝阳师范高等专科学校信息工程系，辽宁 朝阳 122000
牛眼结构是一种典型的纳米光学结构。本文设计了一种带有同轴纳米柱的牛眼结构，利用时域有限差分法(FDTD)研究了该结构的增强透射效应。研究发现，柱的半径和高度对透射特性具有显著的影响，恰当选择柱的半径和高度会得到最大的透射强度。另外，牛眼结构对环境折射率有较高的灵敏度。理论分析表明，该种结构的透射增强效应是由局域表面等离激元与表面极化等离激元相互作用产生。这为纳米光学元件的研发与应用提供一个新的思路。
表面等离激元 光异常透射 牛眼结构 时域有限差分法 surface plasmon EOT bullseye structure finite difference time domain method
