Abstract

Propagation of surface plasmon polaritons (SPPs) excited in the wavelength range 720–830  nm at a corrugated gold-film surface with areas of 150-nm-wide and 45-nm-high scatterers arranged in a 380-nm-period triangular lattice containing line defects is investigated by use of near-field optical microscopy. We demonstrate that the SPP at 740–750  nm propagates along 2.2μm-wide and 16μm-long line defects with 50% loss, whereas its propagation along narrower line defects is strongly damped and in periodically corrugated areas is inhibited. We observe significant deterioration of these effects for both longer and shorter wavelengths and conclude that the SPP guiding occurs as a result of the SPP bandgap effect in the structures.

© 2001 Optical Society of America

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