Abstract
Within the framework of the angular plane-wave spectrum of the electromagnetic field, the general form is given for the freely-propagating beams, exact solution of the Maxwell equations, that closely approach (in an algebraic sense) to a purely-longitudinal vectorial distribution at some transverse plane. In the rotationally symmetric case, such a field is written as the combination of radial and longitudinal components, whose propagation can be analysed independently. Several illustrative examples are also considered.
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Martínez-Herrero, R., Mejías, P.M. & Manjavacas, A. On the longitudinal polarization of non-paraxial electromagnetic fields. Appl. Phys. B 99, 579–584 (2010). https://doi.org/10.1007/s00340-009-3864-6
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DOI: https://doi.org/10.1007/s00340-009-3864-6