Modal characteristics of coupled metallic nanoscale rectangular apertures.
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 1 mm at the wavelength of 0.633 microm, provided the aperture size and the separation are sufficiently large. The effective indices and the propagation lengths of various coupled SPP modes are presented.
Srivastava
Triranjita
T
Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India. triranjita@yahoo.co.in
Kumar
Arun
A