Each ridge blocks part of the wavefront, causing Fresnel diffraction.
2.
That means that a Fresnel diffraction pattern can have a dark center.
3.
The Fresnel diffraction integral is an exact solution to the paraxial Helmholtz equation.
4.
The correct approximation for the propagation in the far field is Fresnel diffraction.
5.
Similar calculations for the near field can be done using the Fresnel diffraction equation.
6.
However, the validity of the Fresnel diffraction integral is deduced by the approximations derived below.
7.
The Fresnel diffraction equation is an approximation of far field region is given by the Fraunhofer diffraction equation.
8.
They arise in the description of near-field Fresnel diffraction phenomena and are defined through the following integral representations:
9.
Lord Rayleigh showed that the Talbot effect was a natural consequence of Fresnel diffraction and that the Talbot length can be found by the following formula:
10.
During exposure, secondary radiation effects such as Fresnel diffraction, mask and substrate fluorescence, and the generation of Auger electrons and photoelectrons can lead to overexposure.
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