Diode-like asymmetric transmission of circularly polarized waves |
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Authors: | Dao-Ya Liu Li-Fang Yao Xiao-Min Zhai Min-Hua Li Jian-Feng Dong |
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Institution: | 1. Institute of Optical Fiber Communication and Network Technology, Ningbo University, Ningbo, 315211, China
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Abstract: | Optical diode plays an important role in optical computing and information processing. In this paper, a kind of three-layered chiral metamaterial is proposed to achieve diode-like asymmetric transmission for forward and backward propagations of circularly polarized electromagnetic waves only. The metamaterial is composed of a ring–chain structure sandwiched between two identical S-shaped metallic layers with their corresponding substrates. A transparent transmission at normal incidence in one direction and a small intensity of transmission in the opposite direction are numerically demonstrated in this chiral structure. Besides, the results reveal that the bandwidth of the cross-polarization transmission of this designed structure can be tuned by varying the incident angle of circularly polarized waves. |
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