Abstract
In this paper, we propose a new structure which is achieved via the combination of twist conjugated gammadion and four-L resonators pairs. The proposed chiral metamaterial can achieve dispersionless and giant optical activity simultaneously. The polarization ellipticity is lower than 0.46° through all function bands, and the polarization azimuth rotation angle is larger than 90.3° from 2.37 to 2.69 THz. Specifically, the structure can achieve 90° dispersionless polarization rotation at f = 2.57 THz. The optical activity is optimized through changing the parameters of the chiral structure and the physical mechanism is also analyzed based on surface current distribution.
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This work is supported by the National Natural Science Foundation of China (Grant No. 61275070) and Shanghai Natural Science Foundation (Grant No. 15ZR1415900).
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Xu, Kk., Xiao, Zy., Tang, Jy. et al. Dispersionless and Giant Optical Activity in Terahertz Chiral Metamaterials. Plasmonics 11, 1257–1264 (2016). https://doi.org/10.1007/s11468-015-0169-y
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DOI: https://doi.org/10.1007/s11468-015-0169-y