On the Metasurface-Based Comb Filters
M. Ghasemi, M. A. Baqir, P. K. Choudhury
IEEE Photonics Technology Letters
Vol. 28 no. 10
pp 1100 -
Metamaterials, plasmonics, nano-sized periodic structure, comb filter
This letter reports a new type of plasmonic metamaterial-based comb filter with the metasurface as similar to the Salusbury window, and comprised of three layers—subwavelength-sized periodic gold nanorods surrounded by freespace (i.e., the metasurface), silicon, and silver nanolayers. The structure yields multiple absorption peaks upon impinged by electromagnetic waves. The metasurface behaves as a comb filter— certain spectral frequencies are absorbed and the remaining ones are reflected back. The performance of filter is analyzed in UV, visible, and near infrared (NIR) regimes considering the p- and s-polarized excitations under different angles of incidence.
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