Abstract
The evanescent modes' dependence on the topological properties of the surface over which optical fields propagate is examined. It is shown that curved geometries, unlike plane one, constrain the wave vector components to take discrete values. This implies that, for cylindrical surfaces, evanescent modes appear only in specific directions, while for spherical surfaces, they are forbidden. The limit of far-field is also investigated. These results are obtained using the angular spectrum technique and agree with the experimental results obtained by Raman scattering on tiny crystallites.
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