Mid-Infrared Chiral Metasurface Absorbers with Split-Ellipse Structures
Natural chiral materials usually have very weak circular dichroism (CD) responses. Here, we design and demonstrate one type of mid-infrared chiral metasurface absorber with strong chiroptical effects, which can achieve high CD in absorption above 0.57 over the wavelength range of 5 to 5.9μm. The maximum absorption of the chiral metasurface absorber under circularly polarized light can reach 0.90 and the maximum CD in absorption is 0.63. Meanwhile, the chiral resonance wavelength and the CD value can be tuned by varying the geometric parameters of the metasurface. A thermal analysis of the metasurface absorber further shows the strong connection between CD in absorption and temperature difference. The demonstrated chiral metasurface absorbers can be used in many promising applications such as molecular sensing, thermophotovoltaics and chiral spectroscopy.
X. Zeng et al., "Mid-Infrared Chiral Metasurface Absorbers with Split-Ellipse Structures," Optics Communications, vol. 525, article no. 128854, Elsevier, Dec 2022.
The definitive version is available at https://doi.org/10.1016/j.optcom.2022.128854
Mechanical and Aerospace Engineering
Keywords and Phrases
Chiral Metasurface; Chiroptical Effect; Circular Dichroism; Thermal Analysis
International Standard Serial Number (ISSN)
Article - Journal
© 2022 Elsevier, All rights reserved.
15 Dec 2022