Ultra-broadband and high-efficiency planar chiral metamaterial

Author:

Hussain Shahid12ORCID,Liu Qingquan12,Maroof Zubaria3,Ji Ruonan4ORCID,Wang Shaowei12ORCID

Affiliation:

1. Shanghai Engineering Research Center of Energy-Saving Coatings

2. University of Chinese Academy of Sciences

3. Xi'an Jiao tong University

4. Northwestern Polytechnic University

Abstract

To date, the helix-like assemblies are known for delivering the most broadband chiroptic response; however, as their dimensions shrink to the nanoscale, it becomes increasingly difficult to realize three-dimensional (3D) building blocks and accurate alignments. In addition, a continuous optical channel requirement hinders the downsizing for integrated photonics. Here, we introduce an alternative approach based on two assembled layers of dielectric–metal nanowires to demonstrate that chiroptic effects similar to helix-like metamaterials can be realized with an ultracompact planar structure by creating dissymmetry using orientation and making use of interference phenomena. We constructed two polarization filters for the near-(NIR) and the mid-infrared (MIR) spectrums that exhibit a broadband (0.835−2.11 µm and 3.84−10.64 µm) chiroptic response with maximum transmission and circular dichroism (CD) of approximately 0.965 and extinction ratio > 600. The structure is easy to fabricate, independent of alignments, and scalable from the visible to MIR range for applications including imaging, medical diagnostics, polarization conversion, and optical communication.

Funder

National Key Research and Development Program of China

National Natural Science Foundation of China

Chinese Academy of Sciences President’s International Fellowship Initiative

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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