Broadband asymmetric transmission for linearly and circularly polarization based on sand-clock structured metamaterial |
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Authors: | Tao Fu Xing-Xing Liu Guo-Hua Wen Tang-You Sun Gong-Li Xiao Hai-Ou Li |
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Affiliation: | (Guangxi Key Laboratory of Precision Navigation Technology and Application,Guilin University of Electronic Technology(GUET),Guilin 541004,China;Department of Mechanical and Biomedical Engineering,City University of Hong Kong,83 Tat Chee Ave,Kowloon,Hong Kong SAR,China) |
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Abstract: | We proposed a sandwich structure to realize broadband asymmetric transmission(AT) for both linearly and circularly polarized waves in the near infrared spectral region. The structure composes of a silica substrate and two sand-clock-like gold layers on the opposite sides of the substrate. Due to the surface plasmons of gold, the structure shows that the AT parameters of linearly and circularly polarized waves can reach 0.436 and 0.403, respectively. Meanwhile, a broadband property is presented for the AT parameter is over 0.3 between 320 THz and 340 THz. The structure realizes a diode-like AT for linearly wave in forward and circularly wave in backward, respectively. The magnetic dipoles excited by current in the two gold layers contribute to the broadband AT. The current density in top and bottom metallic layers illustrates the mechanism of the polarization conversion for broadband AT in detail. |
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