Hassinen Timo, Popov Sergei, Friberg Ari T, Setälä Tero
Opt Lett. 2016 Jul 1;41(13):2942-5. doi: 10.1364/OL.41.002942.
We analyze the time-domain partial polarization of optical fields composed of two evanescent waves created in total internal reflection by random electromagnetic beams with orthogonal planes of incidence. We show that such a two-beam configuration enables to generate nearly unpolarized, genuine three-component (3D) near fields. This result complements earlier studies on spectral polarization, which state that at least three symmetrically propagating beams are required to produce a 3D-unpolarized near field. The degree of polarization of the near field can be controlled by adjusting the polarization states and mutual correlation of the incident beams.
我们分析了由具有正交入射平面的随机电磁光束在全内反射中产生的两个倏逝波组成的光场的时域部分偏振。我们表明，这种双光束配置能够产生几乎非偏振的、真正的三分量（3D）近场。这一结果补充了早期关于光谱偏振的研究，该研究指出至少需要三个对称传播的光束才能产生3D非偏振近场。近场的偏振度可以通过调整入射光束的偏振态和相互相关性来控制。
