Ram B S Bhargava, Senthilkumaran Paramasivam
Opt Lett. 2018 Apr 15;43(8):1830-1833. doi: 10.1364/OL.43.001830.
Phase and polarization are interrelated quantities, and hence polarization elements that perform like phase elements can be designed. In this Letter, we show that a polarizing element producing a negative Poincare-Hopf (PH) index beam can be used as a spatial filter to perform edge enhancement. Either isotropic or anisotropic edge enhancement can be achieved by polarization selection of the light that illuminates the sample. A conventional microscope imaging system is modified into a polarization-selective optical Fourier processor. Experimental results are presented to show that negative PH index filters, producing a set of orthogonal polarization distribution and their superpositions, can also be used for edge enhancement in optical signal processing.
相位和偏振是相互关联的量，因此可以设计出具有类似相位元件功能的偏振元件。在本信函中，我们表明产生负庞加莱 - 霍普夫（PH）指数光束的偏振元件可用作空间滤波器来进行边缘增强。通过选择照射样品的光的偏振，可以实现各向同性或各向异性的边缘增强。传统的显微镜成像系统被改造成一个偏振选择光学傅里叶处理器。实验结果表明，产生一组正交偏振分布及其叠加的负PH指数滤波器也可用于光信号处理中的边缘增强。
