Abstract
We examine the modal characteristics of coupled metallic nanoscale rectangular
apertures using a simple and accurate separation of variables method, recently
proposed by us for a single aperture [Opt. Lett. 33, 333
(2008)]. The study shows that
the coupling between the antisymmetric surface plasmon polariton (SPP) modes of the
two rectangular apertures results in a coupled SPP mode with very large propagation
length, larger than at the wavelength of , provided the aperture size and the separation are sufficiently
large. The effective indices and the propagation lengths of various coupled SPP modes
are presented.
© 2009 Optical Society of America
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