31 October 2016 Asymmetric propagation of electromagnetic waves through nanoscale spirals
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In this paper, we report that normal incidence transmission of different circularly polarized waves through the 2D Archimedes’ nanoscale spirals is asymmetric. The structures consist of raised spiral ridge and two layers metal film covered on the substrate and the ridge. The finite difference time domain method was used to design the structure and perform the simulation. The device can distinguish the different circularly polarized wave across the transmission intensity compare with the common Archimedes’ nanoscale spirals which just exhibit the bright or dark modes in the light field. We confirmed that the device provide about 10% circular dichroism in 3.85um-6.0um broadband region. The circular dichroism in the wavelength 3.95 um can reach 13%. This ultracompact device could prove useful for remote sensing and advanced telecommunication applications.
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Jingpei Hu, Jingpei Hu, Yu Lin, Yu Lin, Aijiao Zhu, Aijiao Zhu, Xiaonan Zhao, Xiaonan Zhao, Chinhua Wang, Chinhua Wang, } "Asymmetric propagation of electromagnetic waves through nanoscale spirals", Proc. SPIE 10022, Holography, Diffractive Optics, and Applications VII, 100221Q (31 October 2016); doi: 10.1117/12.2245384; https://doi.org/10.1117/12.2245384

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