Chinese Optics Letters, Vol. 19, Issue 1, 013601 (2021)
Chiral plasmonic nanostructure of twistedly stacked nanogaps
Jian Zhang1,*, Rui Tu1,2, Chao Huang1,2, Xiaoli Yao1,2, Xin Hu1, Haixiong Ge3, and Xuefeng Zhang1,**
- 1Institute of Advanced Magnetic Materials, College of Materials & Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
- 2College of Electronics and Information, Hangzhou Dianzi University, Hangzhou 310018, China
- 3Department of Materials Science and Engineering, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China
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.
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