Open AccessBroadband circularly polarizing dichroism with high efficient plasmonic helical surface
Author(s) -
Jingpei Hu,
Xiaonan Zhao,
Ruibin Li,
Aijiao Zhu,
Linghua Chen,
Yu Lin,
Bing Cao,
Xiaojun Zhu,
Chinhua Wang
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.011023
Subject(s) - materials science , circular polarization , optics , polarizer , circular dichroism , linear dichroism , surface plasmon , plasmon , polarization (electrochemistry) , optoelectronics , birefringence , physics , chemistry , crystallography , microstrip
We propose and experimentally demonstrate a broadband and high efficient circularly polarizing dichroism using a simple single-cycle and single-helical plasmonic surface array arranged in square lattice. Two types of helical surface structures (partially or completely covered with a gold film) are investigated. It is shown that the circular polarization dichroism in the mid-IR range (3µm - 5µm) can reach 80% (when the surface is partially covered with gold) or 65% (when the surface is completely covered with gold) with a single-cycle and single-helical surface. Experimental fabrications of the proposed helical plasmonic surface are implemented with direct 3D laser writing followed by electron beam evaporation deposition of gold. The experimental evaluations of the circular polarization dichroism are in excellent agreement with the simulation. The proposed helical surface structure is of advantages of easy-fabrication, high-dichroism and scalable to other frequencies as a high efficient broadband circular polarizer.