Abstract
In terms of the radial, azimuthal and longitudinal components of the field, the polarization features of 3D electromagnetic beams are described by defining three local parameters, namely, the so-called 3D degree of meridional polarization, the ratio between meridional and azimuthal contributions and the degree of cross-correlation between meridional and azimuthal field components. At each point Q, the term “meridional” refers to the projection of the electric field vector onto a plane containing the point Q and the longitudinal axis z. These parameters are valid for both paraxial and non-paraxial regimes. Accordingly, they can be used for describing highly-focused fields. The analytical relation among the well-known 3D electromagnetic degree of polarization and the above parameters is also obtained, and several simple cases are considered.
Published Version
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