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Dashtdar M, Mohammadzadeh A, Hosseini-Saber S. Determination of the refractive index of materials with a rough interface by light scattering in the Fresnel zone. ICOP & ICPET _ INPC _ ICOFS 2015; 21 :1169-1172
URL: http://opsi.ir/article-1-651-en.html
URL: http://opsi.ir/article-1-651-en.html
1- Shahid Beheshti University
Abstract: (3830 Views)
When a coherent light passes through a diffraction grating, the image of the grating is formed at the Talbot distances. If we place a rough interface after a diffraction grating, the reflected light also forms the image of the grating at Talbot distances but with less contrast. This contrast decreases proportional to surface roughness. In transmitted light from a rough surface, the contrast of the Talbot images depends on the surface roughness and refractive index of material. In this article It is shown theoretically and examined experimentally that the refractive index of the material with a rough interface can be determine by measuring the contrast of the reflected and transmitted light form a rough surface at Talbot distances.
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