Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Cientificas, Campus de Cantoblanco, Madrid 28049, Spain.
Opt Lett. 2013 Jan 1;38(1):58-60. doi: 10.1364/OL.38.000058.
We investigate the role of the source coherence length in the two alternative definitions, [Phys. Rev. E 66, 016615 (2002)] and [Opt. Commun.248, 333 (2005)], respectively, on the degree of polarization of a three-dimensional near field emitted by a random planar source. It is demonstrated that for the wide variety of statistically homogeneous sources, there are regimes where both definitions are identical. In particular, this occurs for fields from δ-correlated, such as thermal sources. Further, we discuss how the excitation of surface waves influence whether those two definitions coincide.
我们研究了源相干长度在两种替代定义中的作用，分别是[Phys. Rev. E 66, 016615 (2002)]和[Opt. Commun.248, 333 (2005)]，这两种定义分别针对由随机平面源发射的三维近场的偏振程度。结果表明，对于各种统计均匀源，存在两个定义相同的区域。特别是对于δ相关的场，如热源，情况就是如此。此外，我们还讨论了表面波的激发如何影响这两种定义是否一致。
