Volume 2, Number 5 (6-2001)                   IJPR 2001, 2(5): 237-246 | Back to browse issues page


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M. T. Tavassoly, H. Sahl-ol-bei, M. Salehi, H. R. Khalesifard. Fresnel diffraction from a step in reflection and transmission. IJPR. 2001; 2 (5) :237-246
URL: http://ijpr.iut.ac.ir/article-1-19-en.html

Abstract:   (13567 Views)

  In this paper Fresnel diffraction of light from 1-dimensional and circular steps in reflection and transmission modes is theoretically and experimentally studied. The study shows that the diffraction pattern from each side of a step resembles the diffraction pattern from a semi infinite obstacle, but the visibility of fringes is a sensitive periodic function of the step height and the incident angle. This sensitive dependence can be exploited as a useful means for measuring the film thickeness, the refraction index and small displacements of objects in a manner easier and more precise that one can manage by the conventional interferometric methods.

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Type of Study: Research | Subject: general

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