Abstract
Surface polaritons on metallic wire gratings have been investigated by studying power losses at the grating surface. The dispersion, exhibiting gaps of energy and momentum, respectively, has been obtained from calculated power losses for various grating materials and periods. The propagation mechanism of surface polaritons along this nonadjacent periodic interface and the energy gaps in the dispersion are explained by means of the Kronig-Penney model. The power losses at gold-wire gratings with different profiles have been measured by means of photoacoustic spectroscopy. The experimental results agree with the theoretical predictions. The position of the maximum surface polariton excitation yields interesting information for the characterization of the grating profile. \textcopyright{} 1996 The American Physical Society.
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