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Strong circular dichroism in a non-chiral metasurface based on an array of metallic V-shaped nanostructures

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Abstract.

In this paper, an extrinsic chiral metasurface based on a silver thin film containing a periodic array of V-shaped nanostructures is proposed. The proposed structure is normally and obliquely illuminated by right- and left-handed circularly polarized plane waves and the transmission through the structure is calculated using the frequency domain finite-integration technique. Our simulation results show that the designed metasurface exhibits strong circular dichroism (CD) in the transmission \(\Delta = T_{{\rm RCP}}- T_{{\rm LCP}}=0.98\) in the near-infrared region under oblique incidence. To our knowledge, this is one of highest CD effects that have been achieved so far in the single-layer metasurface based on metallic nanostructures. The physical mechanism for this strong CD effect is explained in terms of the current density distribution. Furthermore, the effects of change of the incident angle, the refractive index of surrounding medium and structure parameters, such as film thickness and lattice constants on CD spectrum, are investigated. In addition, the CD phenomenon in the structure is analyzed in other frequency regions.

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Authors and Affiliations

  1. Department of Physics, College of Science, Shiraz University, 71454, Shiraz, Iran

    Abbas Ghasempour Ardakani & Khatereh Moradi

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  1. Abbas Ghasempour Ardakani
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  2. Khatereh Moradi
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Correspondence to Abbas Ghasempour Ardakani.

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Ardakani, A.G., Moradi, K. Strong circular dichroism in a non-chiral metasurface based on an array of metallic V-shaped nanostructures. Eur. Phys. J. Plus 133, 73 (2018). https://doi.org/10.1140/epjp/i2018-11909-0

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  • DOI: https://doi.org/10.1140/epjp/i2018-11909-0

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