Abstract
In this paper, we present a novel model for the design
of micrometric optical antennas. The accuracy of the model allows to evaluate
the near field generated by a micrometric aperture in parallel-plate waveguides.
The model starts from the equivalent source distribution of magnetic current
excitation of a rectangular aperture and it proceeds by employing the multipole
expansion of the Green's function applied to the aperture, including the analysis
of the electromagnetic field in proximity of metallic discontinuities. The
presented method introduces the novel principle of simultaneous transverse
resonance diffraction which determines the order of singularity for different
edges at optical frequencies. The theory is validated by numerical simulations
and experimental results yielding information about the accuracy of the radiated
field solution. The approach is suitable for inclusion in standard electromagnetic
simulators.
© 2011 IEEE
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