Abstract
We theoretically investigate a widely-used plasmonic structure
composed of a nano-slit aperture surrounded by surface corrugations. A systematical
semi-analytical theory in form of two nested coupled-mode models is developed
to provide intuitive physical pictures. Based on the theory, figures of merit
(FoMs) of the structures designed for normal and for oblique incidence/beaming
are defined for the first time to incorporate the interlinks among key structural
parameters, making global optimization simple and efficient. Both the theory
and the FoMs are quantitatively validated with exhaustive calculations and
shown to be highly accurate on performance prediction and structural optimization.
With the theory and the FoMs, an efficient, effective and standard recipe
is introduced for optimal structure design. We believe this work will help
to understand the mechanisms of and to facilitate the design of such a structure
in various configurations used in various applications.
© 2012 IEEE
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