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VOLUME 90 (2009) | ISSUE 5 | PAGE 398
Surface plasmon polaritons in metallo-dielectric meander-type gratings
PACS: 42.70.Qs, 73.20.Mf
Abstract
The optical properties of a gold film deposited on a quartz substrate with periodic grooves were investigated theoretically. The main peculiarities of the spectra are due to the excitation of the surface plasmon polaritons (SPPs). It is shown that the empty lattice approximation (ELA) for the SPPs is well applicable for the structure of interest. Two different approaches for deriving the air-gold SPP dispersion curves are compared. Our special attention is focused on the wavelength region approaching the d-band in gold, where the dielectric function is of a strongly non-Drude-type.