Wide angle near-field diffraction and Wigner distribution

Details Wide angle near-field diffraction and Wigner distribution Wide angle near-field diffraction and Wigner distribution

2003-05-08

arxiv.org/abs/physics/0305026v1

Optik 114 (7): 333-335 (2003)

Physics

Optics

9 pages, 4 figures

Scientific paper

10.1078/0030-4026-00272

Free-space propagation can be described as a shearing of the Wigner distribution function in the spatial coordinate; this shearing is linear in paraxial approximation but assumes a more complex shape for wide-angle propagation. Integration in the frequency domain allows the determination of near-field diffraction, leading to the well known Fresnel diffraction when small angles are considered and allowing exact prediction of wide-angle diffraction. The authors use this technique to demonstrate evanescent wave formation and diffraction elimination for very small apertures.

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