Zhou Yingjie, Ye Xianglin, Liu Shang, Chen Shizhen, Tang Dongliang, Fan Fan
Opt Lett. 2023 Oct 1;48(19):5085-5088. doi: 10.1364/OL.500133.
In this Letter, we propose a multifunctional imaging system enabled by a single geometric-phase-based liquid crystal (LC) element, which integrates chiral polarization and edge enhancement imaging. The element is located at the frequency domain plane in a 4F imaging system, and the phase profile of the element consists of a fork grating in the x direction and a grating in the y direction, which provide edge enhancement and chiral polarization imaging capabilities. Benefiting from the tunable property of the LC, the system can be switched from a polarization and edge imaging mode to the normal conventional imaging mode which is capable of conveniently acquiring the needed image information. Experiments demonstrate that the system can easily achieve multifunctional and switchable imaging, which agrees well with our design, and our LC element can work in the broadband spectrum because of the geometric phase modulation. The multifunctional strategy used here can effectively avoid the need to increase the size of the original microscopic system and the need for additional mechanical rotation of components. We believe that the proposed system with the additional advantages of electric control and tunability can find applications in biological imaging, medical detection, and optical computing.
在本信函中，我们提出了一种由单个基于几何相位的液晶（LC）元件实现的多功能成像系统，该系统集成了手性偏振成像和边缘增强成像。该元件位于4F成像系统的频域平面，其相位分布由x方向的叉形光栅和y方向的光栅组成，分别提供边缘增强和手性偏振成像功能。受益于液晶的可调特性，该系统可以从偏振和边缘成像模式切换到能够方便地获取所需图像信息的普通传统成像模式。实验表明，该系统能够轻松实现多功能和可切换成像，这与我们的设计非常吻合，并且由于几何相位调制，我们的液晶元件可以在宽带光谱中工作。这里使用的多功能策略可以有效避免增加原始微观系统尺寸的需求以及额外的部件机械旋转需求。我们相信，所提出的系统具有电控和可调性等额外优势，能够在生物成像、医学检测和光学计算中找到应用。
