Broadband Infrared Circular Dichroism in Chiral Metasurface Absorbers
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.
L. Ouyang et al., "Broadband Infrared Circular Dichroism in Chiral Metasurface Absorbers," Nanotechnology, vol. 31, no. 29, Institute of Physics - IOP Publishing, May 2020.
The definitive version is available at https://doi.org/10.1088/1361-6528/ab88ea
Mechanical and Aerospace Engineering
Keywords and Phrases
Broadband; Chiral Image; Chiral Metasurface; Circular Dichroism
International Standard Serial Number (ISSN)
Article - Journal
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01 May 2020