Abstract: Artificial electromagnetic metamaterials based on the subwavelength units structure have excellent electromagnetic/optical properties, such as negative refractive index, super-resolution and polarization conversion, making them to be the leading field in the areas of quantum communication, nano-optics, material science, energy exploration and others in recent years. Among them, the study of chiral metamaterials is particularly prominent. Chiral metamaterials refer to a new type of electromagnetic metamaterial which have no geometric symmetry and can’t be overlapped with their mirror image by rotation or translation or other operations. The further investigations of metamaterials drastically enrich the mode-ling of chiral structures, and provide more effective methods for the research of many obscure physical phenomenas and theoretical analysis. The unique electromagnetic/optical properties of chiral metamaterials, including ultra-strong optical activity, circular dichroism and asymmetric transmission, offer a fire-new research direction for electromagnetic, physics, materials science, optics, acoustics, nanoscience and information science, etc. Chirality is considered to be an inherent feature of chiral molecules and a manifestation of vital signs that are ubiquitous in the organic world, such as proteins, DNA, sugar molecules, viruses, amino acids and liquid crystals. However, the chiral structure is extremely limited in nature, and the related modeling and theoretical analysis merely stay at the characterization of the original structure. At present, the research of chiral metamaterials is gradually expanding from microwave segment to the terahertz, infrared band, and even light wave band. Since the realization of electromagnetic metamaterials based on chiral microstructures highly lies on the size of the cell structure and the arrangement of periodic arrays, thus the absorption bandwidth is still limited in a narrower frequency range, and the ability of recognizing (selective absorption) the left-handed circular polarized wave (LCP) and right-handed circular polarized wave (RCP) is relatively weak as well. With the further research on the chiral metamaterials, the differential absorptivity of microwave frequency band is gradually increased over 90%, while in high frequency band it is still low. In addition, with the development of micro-nano technology and nano technology, the utilization of new functio-nal materials, including semiconductor materials, phase change materials, high resistance/inductance/capacitance thin films and graphene, and matching circuits combined with lumped elements provide a research space for achieving infrared and visible wave band absorbers. This paper introduces the principle of absorption of circular polarized waves by chiral metamaterials, and detailedly expound the research progress in the absorption spectra of chiral metamaterials of intrinsic chiral structure, the external extrinsic chiral structure and other new functional materials, including semiconductor materials, graphene, etc. The chiral absorption characteristics based on artificial electromagnetic microstructures are available in the design of electromagnetic/optical devices such as polarization converter, electromagnetic energy collector, infrared imaging and so on.
汪丽丽, 宋健, 梁加南, 李敏华. 手性超材料圆极化波吸收特性研究进展[J]. 材料导报, 2019, 33(3): 500-509.
WANG Lili, SONG Jian, LIANG Jianan, LI Minhua. Research Progress of the Absorption Characteristics of Circular Polarization Wave in Chiral Metamaterials. Materials Reports, 2019, 33(3): 500-509.
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