Resonant excitation of evanescent spatial harmonics in medium formed by parallel metallic nanorods |
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| Authors: | A E Ageyskiy S Yu Kosulnikov P A Belov |
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| Institution: | 1.St. Petersburg State University of Information Technologies, Mechanics, and Optics,St. Petersburg,Russia;2.Queen Mary University of London,School of Electronic Engineering and Computer Science,London,UK |
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| Abstract: | The results of analytical modeling of the resonant excitation of evanescent harmonics in a medium formed by parallel metallic
nanorods taking into account the spatial dispersion are presented. Analytical expressions are derived for the reflection and
transmission coefficients, as well as for the amplitudes of electromagnetic waves inside the medium. These expressions are
compared to similar expressions that were previously obtained using a local model of an ultimately anisotropic material without
taking into account the spatial dispersion. The obtained expressions are simplified for various partial cases, including the
superresolution imaging of a source that is located at a considerable distance from the metamaterial layer. A layer of a medium
composed from finitesized wires is numerically simulated and it is demonstrated that, due to the effect of resonant excitation
of evanescent spatial harmonics in the layer, subwavelength details of an object that is considerably distant from the layer
can be distinguished inside of the layer. |
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