Abstract
We propose a physical understanding of scattering by subwavelength grooves surrounding a single perfect conductor slit based on the superposition of a cylindrical traveling surface wave and a standing surface wave. The collective reflection coefficient was introduced to handle the multi-interaction of the surface wave between subwavelength grooves, and a slit–grooves focusing structure was designed to demonstrate its validity. In comparison to numerical simulations by the finite difference time domain method, the proposed method proves effective in describing the multi-interaction behavior of a surface wave and in further refining the phase perturbation at the grooves’ exits.
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Shi, H., Dong, X., Lv, Y. et al. Multi-interaction of surface wave between subwavelength grooves surrounding a single metallic slit. Appl. Phys. B 95, 345–350 (2009). https://doi.org/10.1007/s00340-009-3413-3
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DOI: https://doi.org/10.1007/s00340-009-3413-3