Chiral plasmonic nanostructure of twistedly stacked nanogaps  

作　　者：Jian Zhang Rui Tu Chao Huang Xiaoli Yao Xin Hu Haixiong Ge Xuefeng Zhang 张鉴;屠蕊;黄超;姚小莉;胡鑫;葛海雄;张雪峰(Institute of Advanced Magnetic Materials,College of Materials&Environmental Engineering,Hangzhou Dianzi University,Hangzhou 310018,China;College of Electronics and Information,Hangzhou Dianzi University,Hangzhou 310018,China;Department of Materials Science and Engineering,College of Engineering and Applied Sciences,Nanjing University,Nanjing 210093,China)

机构地区：[1]Institute of Advanced Magnetic Materials,College of Materials&Environmental Engineering,Hangzhou Dianzi University,Hangzhou 310018,China [2]College of Electronics and Information,Hangzhou Dianzi University,Hangzhou 310018,China [3]Department of Materials Science and Engineering,College of Engineering and Applied Sciences,Nanjing University,Nanjing 210093,China

出　　处：《Chinese Optics Letters》2021年第1期95-99,共5页中国光学快报（英文版）

基　　金：the National Natural Science Foundation of China (Nos. U1704253 and 51471045);the Zhejiang Provincial Foundation for Distinguished Young Scholars (No. LR18E010001);the Zhejiang Provincial Key Research and Development Program (No. 2019C01121);the start-up funding supported from the Hangzhou Dianzi University。

摘　　要：Nanogap plasmonic structures with strong coupling between separated components have different responses to orthogonal-polarized light, giving rise to giant optical chirality. Here, we proposed a three-dimensional(3D) nanostructure that consists of two vertically and twistedly aligned nanogaps, showing the hybridized charge distribution within 3D structures.It is discovered that the structure twisted by 60° exhibits plasmonic coupling behavior with/without gap modes for different circular-polarized plane waves, showing giant chiral response of 60% at the wavelength of 1550 nm. By controlling the disk radius and the insulator layer, the circular dichroism signal can be further tuned between 1538 and 1626 nm.

关 键 词：metal-insulator-metal structure nanogaps gap mode twisted stacking charge distribution chiral response 

分 类 号：O53[理学—等离子体物理]