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.
M. T. Tavassoly, , H. Sahl-ol-bei, , M. Salehi, & H. R. Khalesifard, . (2020). Fresnel diffraction from a step in reflection and transmission. Iranian Journal of Physics Research, 2(5), 237–246.
MLA
M. T. Tavassoly, , H. Sahl-ol-bei, , M. Salehi, & H. R. Khalesifard, . "Fresnel diffraction from a step in reflection and transmission", Iranian Journal of Physics Research, 2, 5, 2020, 237–246.
HARVARD
M. T. Tavassoly, , H. Sahl-ol-bei, , M. Salehi, & H. R. Khalesifard, . (2020). 'Fresnel diffraction from a step in reflection and transmission', Iranian Journal of Physics Research, 2(5), pp. 237–246.
CHICAGO
M. T. Tavassoly, , H. Sahl-ol-bei, , M. Salehi, & H. R. Khalesifard, , "Fresnel diffraction from a step in reflection and transmission." Iranian Journal of Physics Research, 2 5 (2020): 237–246,
VANCOUVER
M. T. Tavassoly , H. Sahl-ol-bei , M. Salehi , H. R. Khalesifard . Fresnel diffraction from a step in reflection and transmission. Iranian Journal of Physics Research. 2020;2(5):237–246 (In Persian).
