Measurement and analysis of scattering of an evanescent wave by a Pt-coated thin fiber on a Pt-coated prism

We have measured scattering pattern of an evanescent wave by a Pt-coated thin fiber above a Pt-coated prism. The pattern is dependent on diameter and complex refractive index of the fiber and a Pt-film of the prism, the separation distance between the fiber and the film, and on an incident angle of a laser light. This is verified by assuming a model modifying the double cylinder scattering of a laser light. The diameter and the indices have been determined independently by light scattering or attenuated total reflection method before the measurement. Some of the experimental data and the well corresponding model calculations are presented.