Fresnel diffraction from a step in reflection and transmission modes

Mohammad Taghi Tavassoly; M. Sahlol-Bai; M. Salehi; Hamid Reza Khalesifard

doi:10.1117/12.354885

19 July 1999 Fresnel diffraction from a step in reflection and transmission modes

Mohammad Taghi Tavassoly, M. Sahlol-Bai, M. Salehi, Hamid Reza Khalesifard

Proceedings Volume 3749, 18th Congress of the International Commission for Optics; (1999) https://doi.org/10.1117/12.354885
Event: ICO XVIII 18th Congress of the International Commission for Optics, 1999, San Francisco, CA, United States

Abstract

Fresnel diffraction from a step, in reflection and transmission modes is studied. The study shows that the resulting diffraction pattern is similar to that of a semi- infinite obstacle, but the intensity distribution near the step edge is very sensitive to the step height and is a periodic function of the height. Therefore the effect can be exploited for measuring the heights and optical path differences of the coated films, strips, and small displacements.

Citation Download Citation

Mohammad Taghi Tavassoly, M. Sahlol-Bai, M. Salehi, and Hamid Reza Khalesifard "Fresnel diffraction from a step in reflection and transmission modes", Proc. SPIE 3749, 18th Congress of the International Commission for Optics, (19 July 1999); https://doi.org/10.1117/12.354885

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