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.
© 2006 Optical Society of America
Fourier Optics and Optical Signal Processing
Original Manuscript: June 12, 2006
Revised Manuscript: September 4, 2006
Manuscript Accepted: September 13, 2006
Published: November 9, 2006
Pierre Pellat-Finet, Pierre-Emmanuel Durand, and Éric Fogret, "Spherical angular spectrum and the fractional order Fourier transform," Opt. Lett. 31, 3429-3431 (2006)