Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1672890 | Thin Solid Films | 2008 | 6 Pages |
In this paper measurement on the propagation of Rayleigh waves on the surface of polymer line structures on top of a silver layer were examined by using plasmon mediated Brillouin scattering. The line structures grating constants were 8, 4 and 1 μm. Spectra were recorded with different scattering angles and propagation directions with respect to the line direction. Three Rayleigh modes have been observed in samples with grating constants 8 and 4 μm. In the parallel direction, one mode is unshifted relative to a pure silver surface. In the perpendicular direction there is one unshifted and one shifted mode. The observed shift of 6 μm− 1 is independent of the grating constant. The 1 μm sample shows a somewhat contrasting behavior. Two different scattering mechanisms, involving surface plasmons at each interface, are proposed to explain the observed effects.