LIGHT SCATTERING BY MICROSTRUCTURES IN PLASTIC NUCLEAR TRACK DETECTOR PLANE SURFACES (ELASTIC, FLUORESCENCE, CONICAL PITS, CYLINDRICAL PORES).

摘要

The angular distributions of light elastically scattered by finite dielectric conical and cylindrical microstructures in plastic nuclear track detector plane surfaces have been measured. These microstructures are the chemically etched tracks of various nuclei, viz., protons, neutrons, He-3, alphas, and Fe-56. The base diameters of the structures are larger than twice the wavelength of the incident light. The results show the dependence of the scattering patterns on shape, size, orientation, and refractive index of the structures as well as the polarization of the incident light. It is also observed that in the single and independent scattering regime, the intensity at the intermediate angular region exhibits linear proportionality to the number of the microstructures per unit area.;Measurements of the angular fluorescent scattering patterns by dye molecules deposited in conical and cylindrical microstructures in plastic plane surfaces reveal the effects of shape and orientation of the microstructures. Consideration of the polarization of the scattered fluorescence indicates that the excited molecules are free to rotate during the period between the absorption and emission.