Metalens-Assisted System for Underwater Imaging,Laser & Photonics Reviews

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Metalens-Assisted System for Underwater Imaging
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2021-06-17 , DOI: 10.1002/lpor.202100097
Feng Zhao _{1,

2} , Rusi Lu ₃ , Xiangning Chen ₂ , Chunqi Jin ₁ , Sai Chen ₁ , Zicheng Shen ₁ , Cheng Zhang ₃ , Yuanmu Yang ₁

Affiliation

The ability to image under water is highly desirable for a variety of applications including biological monitoring and seafloor survey, yet the image quality is usually hampered by the presence of scattering medium in water. Polarization imaging has proven to be an effective method for image enhancement; however, conventional systems require mechanically rotating polarizers which compromises the system's footprint or a set of polarization filters which limits the system's efficiency. Here, a compact polarization imaging apparatus that leverages a multifunctional planar dielectric metalens to simultaneously capture two orthogonally polarized images of an underwater scene is presented. Using a metalens to image target objects through milky water in a single shot, large enhancement of image contrast and depth estimation of target objects in real-time are demonstrated. This work shows the effectiveness of metalens for tackling challenging imaging tasks in complex environments.

中文翻译：

用于水下成像的元透镜辅助系统

对于包括生物监测和海底调查在内的各种应用而言，在水下成像的能力是非常理想的，但图像质量通常会受到水中散射介质的影响。偏振成像已被证明是一种有效的图像增强方法；然而，传统系统需要机械旋转偏振器，这会影响系统的占地面积或一组偏振滤光器，这会限制系统的效率。在这里，提出了一种利用多功能平面介电元透镜同时捕获水下场景的两个正交偏振图像的紧凑型偏振成像设备。使用超透镜在一次拍摄中通过乳白色的水对目标物体成像，展示了图像对比度的大幅增强和目标对象的实时深度估计。这项工作显示了元透镜在复杂环境中处理具有挑战性的成像任务的有效性。

更新日期：2021-08-15

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