A. Alonso, Miguel Borghi, Riccardo Santarsiero, Massimo Media 2: New basis for rotationally symmetric nonparaxial fields in terms of spherical waves with complex foci Originally published in Optics Express on 24 July 2006 (oe-14-15-6894) 24 July 2006;basis;media;oe;Optics Express;term;foci;New;nonparaxial fields 2006-07-24
    https://opticapublishing.figshare.com/articles/media/Media_2_New_basis_for_rotationally_symmetric_nonparaxial_fields_in_terms_of_spherical_waves_with_complex_foci/4934570
10.1364/OE.14.006894.m002