The monochromatic nonparaxial vector fields that achieve a minimum spatial spread for a given directional spread are found. The derivation of these fields is analogous to the one presented in part I of this series for the case of scalar fields. This derivation is based on a variational treatment and multipolar expansion. The resulting lower bounds for the spreads of vector fields turn out to be considerably more restrictive than for scalar fields.
© 2006 Optical Society of America
Original Manuscript: April 28, 2005
Manuscript Accepted: August 13, 2005
Miguel A. Alonso, Riccardo Borghi, and Massimo Santarsiero, "Nonparaxial fields with maximum joint spatial-directional localization. II. Vectorial case," J. Opt. Soc. Am. A 23, 701-712 (2006)