DTU Fotonik, Department of Photonics Engineering, Technical University of Denmark, Kgs. Lyngby 2800, Denmark.
DTU Nanolab, National Centre for Nano Fabrication and Characterization, Technical University of Denmark, Kgs. Lyngby 2800, Denmark.
Nano Lett. 2021 May 12;21(9):3820-3826. doi: 10.1021/acs.nanolett.1c00190. Epub 2021 Apr 22.
Phase retrieval is a noninterferometric quantitative phase imaging technique that has become an essential tool in optical metrology and label-free microscopy. Phase retrieval techniques require multiple intensity measurements traditionally recorded by camera or sample translation, which limits their applicability mostly to static objects. In this work, we propose the use of a single polarization-dependent all-dielectric metasurface to facilitate the simultaneous recording of two images, which are utilized in phase calculation based on the transport-of-intensity equation. The metasurface acts as a multifunctional device that splits two orthogonal polarization components and adds a propagation phase shift onto one of them. As a proof-of-principle, we demonstrate the technique in the wavefront sensing of technical samples using a standard imaging setup. Our metasurface-based approach fosters a fast and compact configuration that can be integrated into commercial imaging systems.
相移是一种非干涉定量相位成像技术，已成为光学计量学和无标记显微镜的重要工具。相移技术需要传统上通过相机或样品平移记录的多个强度测量，这限制了它们主要适用于静态物体。在这项工作中，我们提出使用单个偏振相关的全介质超表面来方便地同时记录两个图像，这些图像用于基于强度传输方程的相位计算。超表面作为一种多功能器件，将两个正交偏振分量分开，并在其中一个分量上增加传播相位移动。作为原理验证，我们使用标准成像设置在技术样品的波前感测中展示了该技术。我们基于超表面的方法促进了一种快速紧凑的配置，可以集成到商业成像系统中。
