He Yanliang, Jiang Tao, Yang Zhi, Liu Tingting, Fang Feiguo, Wang Xianping
Opt Lett. 2024 Aug 1;49(15):4070-4073. doi: 10.1364/OL.525230.
Here, we present a novel, to the best of our knowledge, optical edge detection scheme that can be operated in both linear and circular polarization modes, leveraging an optical spatial differentiator constructed by quarter-wave Pancharatnam-Berry (P-B) phase gradient element. After explaining the theoretical mechanism, we utilize a quarter-wave P-B phase liquid crystal polarization grating to validate the dual-polarization optical edge detection capability. We demonstrate that the orientation of linear polarization and the spin of circular polarization dictate the transition between edge and bright-field images. Besides, the linear and circular polarization modes exhibit broadband and monochromatic responsive properties, respectively. This mechanism, dependent on wavelength and polarization, holds promise for applications in color image processing, chiral sensing imaging, and polarization-entangled quantum imaging.
在此，据我们所知，我们提出了一种新颖的光学边缘检测方案，该方案可在直线偏振和圆偏振模式下运行，利用由四分之一波潘查拉特纳姆-贝里（P-B）相位梯度元件构建的光学空间微分器。在解释了理论机制之后，我们利用四分之一波P-B相位液晶偏振光栅来验证双偏振光学边缘检测能力。我们证明，直线偏振的方向和圆偏振的自旋决定了边缘图像和亮场图像之间的转换。此外，直线偏振和圆偏振模式分别表现出宽带和单色响应特性。这种依赖于波长和偏振的机制在彩色图像处理、手性传感成像和偏振纠缠量子成像等应用中具有前景。
