Abstract
Chirality plays an essential role in the fields of biology, medicine and physics. However, natural materials exhibit very weak chiroptical response. In this paper, near-infrared chiral plasmonic metasurface absorbers are demonstrated to selectively absorb either the left-handed or right-handed circularly polarized light for achieving large circular dichroism (CD) across the wavelength range from 1.3 µm to 1.8 µm. It is shown that the maximum chiral absorption can reach to 0.87 and that the maximum CD in absorption is around 0.70. The current chiral metasurface design is able to achieve strong chiroptical response, which also leads to high thermal CD for the local temperature increase. The high-contrast reflective chiral images are also realized with the designed metasurface absorbers. The demonstrated chiral metasurface absorbers can be applied in many areas, such as optical filters, thermal energy harvesting, optical communication, and chiral imaging.
Highlights
Chirality represents the asymmetry property of matter, which is important in many fields of science and engineering
Chirality has been introduced in chemistry since the 1870s [1], and the study of chirality advances our knowledge in understanding the mysteries of nature [2,3,4,5,6,7,8,9,10,11]
We present one kind of highly-efficient chiral plasmonic metasurface absorbers working in the near-infrared wavelength region
Summary
Chirality represents the asymmetry property of matter, which is important in many fields of science and engineering. The designed chiral metasurface absorber, consisting of a three-layer metal-dielectric-metal structure, can selectively absorb the LCP or RCP normal incident light.
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