Wide angle near-field diffraction and Wigner distribution
Abstract: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.
Document Type: Research Article
Affiliations: 1: Universidade do Minho, Physics Department, 4710-057 Braga, Portugal 2: University of Missouri – St. Louis, School of Optometry and Department of Physics and Astronomy, St. Louis, MO 63121, USA
Publication date: 2003-11-01