title: Spherical angular spectrum and the fractional order Fourier transform.
abstract: The notion of a spherical angular spectrum leads to the decomposition of the field amplitude on a spherical emitter into a sum of spherical waves that converge onto the Fourier sphere of the emitter. Unlike the usual angular spectrum, the spherical angular spectrum is propagated as the field amplitude, in a way that can be expressed by a fractional order Fourier transform.
authors.affiliation: Groupe d'Optique Théorique et Appliquée, Université de Bretagne Sud, Lorient, France. pierre-pellat-finet@univ-ubs.fr
authors.forename: Pierre
authors.initials: P
authors.lastname: Pellat-Finet
authors.forename: Pierre-Emmanuel
authors.initials: PE
authors.lastname: Durand
authors.forename: Eric
authors.initials: E
authors.lastname: Fogret