Romero J A, Hernández L
Department of General Physics, Faculty of Physics, University of Havana, Colina Universitaria, 10400 Havana, Cuba.
J Opt Soc Am A Opt Image Sci Vis. 2007 Apr;24(4):1071-3. doi: 10.1364/josaa.24.001071.
Using a vectorial formulation, we show that Huygens's secondary-sources density is constant in plane waves, and it depends only on the wavelength. We also illustrate that Huygens's secondary sources, which act as emitters of secondary wavelets, have a finite dimension equal to 3 pi/2k(2).