Spherical angular spectrum and the fractional order Fourier transform.
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.
Pellat-Finet
Pierre
P
Groupe d'Optique Théorique et Appliquée, Université de Bretagne Sud, Lorient, France. pierre-pellat-finet@univ-ubs.fr
Durand
Pierre-Emmanuel
PE
Fogret
Eric
E