Broadband optical magnetism in chiral metallic nanohole arrays by shadowing vapor deposition
Abstract
We show that broadband optical magnetism can be achieved through incorporating multi-scaled 3D metallic meta-elements into Z-shaped nanohole arrays. The broadband effect arises from the excitation of multiple magnetic resonances in the meta-elements at different wavelengths. Moreover, the nanohole arrays exhibit a large transmission difference for left- and right-handed circularly polarized incident light due to the chiral arrangement of the meta-elements. More importantly, we have realized experimentally the broadband behavior for the optical range in Ag nanohole arrays fabricated by using a shadowing vapor deposition method. Our study opens up new opportunities for achieving broadband artificial magnetism at visible frequencies which allows possible applications in plasmonic bio-sensors or energy concentrators.
- Publication:
-
Applied Physics Letters
- Pub Date:
- December 2016
- DOI:
- 10.1063/1.4972789
- arXiv:
- arXiv:1501.07682
- Bibcode:
- 2016ApPhL.109y1102H
- Keywords:
-
- Physics - Optics
- E-Print:
- 5 pages, 4 figures