Roy Abhijit, Singh Rakesh K, Brundavanam Maruthi M
Opt Lett. 2017 Nov 1;42(21):4343-4346. doi: 10.1364/OL.42.004343.
A new technique based on superposition of two speckle patterns is proposed and demonstrated for controlled modulation of the spatial polarization distribution of the resultant speckle. It is theoretically and experimentally demonstrated that controlled modulation of the spatial polarization distribution of laser speckle can be achieved by proper choice of the polarization states as well as the average spatial intensity of the constituent speckles. It is shown that the proposed technique is useful to generate different speckle patterns with sinusoidal variation in their degree of polarization, which can be tuned from zero to unity. This technique can find application in sensing, biomedical studies, and in determining the rotation of an electric field vector after passing through a scattering medium.
提出并演示了一种基于两种散斑图案叠加的新技术，用于对合成散斑的空间偏振分布进行可控调制。从理论和实验上证明，通过适当选择偏振态以及组成散斑的平均空间强度，可以实现对激光散斑空间偏振分布的可控调制。结果表明，所提出的技术可用于生成偏振度呈正弦变化的不同散斑图案，其偏振度可从零调至一。该技术可应用于传感、生物医学研究以及确定电场矢量通过散射介质后的旋转。
