Opt Lett. 2022 Nov 15;47(22):5754-5757. doi: 10.1364/OL.468452.
Optical analog computing operates on the amplitude, phase, polarization, and frequency distributions of the electromagnetic field through the interaction of light and matter. The differentiation operation is widely used in all-optical image processing technology, such as edge detection. Here, we propose a concise way to observe transparent particles, incorporating the optical differential operation that occurs on a single particle. The particle's scattering and cross-polarization components combine into our differentiator. We achieve high-contrast optical images of transparent liquid crystal molecules. The visualization of aleurone grains (the structures that store protein particles in plant cells) in maize seed was experimentally demonstrated with a broadband incoherent light source. Avoiding the interference of stains, our designed method provides the possibility to observe protein particles directly in complex biological tissues.
光学模拟计算通过光与物质的相互作用来对电磁场的幅度、相位、偏振和频率分布进行操作。微分操作广泛应用于全光图像处理技术中，例如边缘检测。在这里，我们提出了一种简洁的方法来观察透明粒子，将在单个粒子上发生的光学微分操作结合在一起。粒子的散射和交叉偏振分量组合成我们的微分器。我们实现了透明液晶分子的高对比度光学图像。利用宽带非相干光源，在玉米种子中对糊粉粒（植物细胞中储存蛋白质颗粒的结构）进行了实验验证。通过避免染色的干扰，我们设计的方法为在复杂的生物组织中直接观察蛋白质颗粒提供了可能性。
