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.


Mechanical and Aerospace Engineering


The authors acknowledge support from the National Science Foundation, USA (Grant No. DMR-1552871 and ECCS-1653032). This work was performed, in part, at the Center for Nanoscale Materials, a U.S. Department of Energy Office of Science User Facility, and supported by the U.S. Department of Energy, Office of Science (Contract No. DE-AC02-06CH11357). The authors also acknowledge the support from the Intelligent Systems Center and the facility support from the Materials Research Center at Missouri University of Science and Technology

Keywords and Phrases

Chiral Metasurface; Chiroptical Effect; Circular Dichroism; Thermal Analysis

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Article - Journal

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Publication Date

15 Dec 2022