Abstract
The Finite-Difference Time-Domain (FDTD) method is used to study the
frequency dependence of the transmission through a plasmonic screen with slots
of sizes and spacing that were chosen using the spatially shifted beam approach
to achieve subwavelength focusing. It is shown that the electric field beamwidth
at the focal plane exhibits a resonance-like behavior in the vicinity of the
frequency for which the meta-screen was designed to work. At this frequency
range, the power flow path is shown to exhibit circulation around the slotted
screen. Results are also compared with those given in for a similar device working at a lower
frequency range where the metallic screen behaves as a perfect electric conductor.
© 2012 IEEE
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