کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
733789 | 893368 | 2012 | 4 صفحه PDF | دانلود رایگان |
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.
► New local parameters have been defined.
► The proposed parameters apply to 3D non-paraxial light fields.
► The parameters describe meridional and azimuthal polarization features.
► The parameters are specially adapted to studying nearly radial and azimuthal fields.
► Relation between the 3D electromagnetic degree of polarization and the new parameters is found.
Journal: Optics & Laser Technology - Volume 44, Issue 6, September 2012, Pages 1796–1799