Title

Broadband Infrared Circular Dichroism in Chiral Metasurface Absorbers

Abstract

Chirality is ubiquitous in nature and it is essential in many fields, but natural materials possess weak and narrow-band chiroptical effects. Here, chiral plasmonic metasurface absorbers are designed and demonstrated to achieve large broadband infrared circular dichroism (CD). The broadband chiral absorber is made of multiple double-rectangle resonators with different sizes, showing strong absorption of left-handed or right-handed circularly polarized (LCP or RCP) light above 0.7 and large CD in absorption more than 0.5 covering the wavelength range from 1.35 µm to 1.85 µm. High broadband polarization-dependent local temperature increase is also obtained. The switchable infrared reflective chiral images are further presented by changing the wavelength and polarization of incident light. The broadband chiral metasurface absorbers promise future applications in many areas such as polarization detection, thermophotovoltaics, and chiral imaging.

Department(s)

Mechanical and Aerospace Engineering

Keywords and Phrases

Broadband; Chiral Image; Chiral Metasurface; Circular Dichroism

International Standard Serial Number (ISSN)

0957-4484; 1361-6528

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2020 Institute of Physics - IOP Publishing, All rights reserved.

Publication Date

01 May 2020

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