南京大学徐挺团队通过光子自旋解耦超表面实现透明流场的非侵入性和全二维定量可视化。相关论文于2025年3月5日发表在《光：科学与应用》杂志上。

透明流场可视化技术在工程和科学应用中起着至关重要的作用。它们提供了一种清晰直观的方法来理解流体动力学及其复杂现象，如层流、湍流和涡流。然而，在非侵入性条件下实现透明流场的完全二维定量可视化仍然是一个重大挑战。

研究组提出了一种通过利用具有光子自旋解耦能力的介电元表面阵列的协同效应来实现流场可视化的方法。这种方法能够同时采集包含两个正交维度流场信息的光场图像，从而可以实时定量地推导多个物理参数。作为概念验证，他们通过实验证明了所提出的可视化技术对各种场景的适用性，包括温度场映射、气体泄漏检测、各种流体物理现象的可视化以及透明相对象的3D形态重建。

这项技术不仅为推进流体物理学的研究建立了一个卓越的平台，而且在工业设计和视觉领域具有广泛的应用潜力。

附：英文原文

Title: Non-invasive and fully two-dimensional quantitative visualization of transparent flow fields enabled by photonic spin-decoupled metasurfaces

Author: Fan, Qingbin, Lin, Peicheng, Tan, Le, Huang, Chunyu, Yan, Feng, Lu, Yanqing, Xu, Ting

Issue&Volume: 2025-03-05

Abstract: Transparent flow field visualization techniques play a critical role in engineering and scientific applications. They provide a clear and intuitive means to understand fluid dynamics and its complex phenomena, such as laminar flow, turbulence, and vortices. However, achieving fully two-dimensional quantitative visualization of transparent flow fields under non-invasive conditions remains a significant challenge. Here, we present an approach for achieving flow field visualization by harnessing the synergistic effects of a dielectric metasurface array endowed with photonic spin-decoupled capability. This approach enables the simultaneous acquisition of light-field images containing flow field information in two orthogonal dimensions, which allows for the real-time and quantitative derivation of multiple physical parameters. As a proof-of-concept, we experimentally demonstrate the applicability of the proposed visualization technique to various scenarios, including temperature field mapping, gas leak detection, visualization of various fluid physical phenomena, and 3D morphological reconstruction of transparent phase objects. This technique not only establishes an exceptional platform for advancing research in fluid physics, but also exhibits significant potential for broad applications in industrial design and vision.

DOI: 10.1038/s41377-025-01793-2

Source: https://www.nature.com/articles/s41377-025-01793-2