Lyu Baiying, Chen Chen, Wang Jian, Li Chang, Zhang Wei, Feng Yuxiang, Dong Fei, Zhang BaoShun, Zeng Zhongming, Wang Yiqun, Wu Dongmin
School of Nano-Tech and Nano-Bionics, University of Science and Technology of China, Hefei 230026, China.
Nanofabrication Facility, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China.
Nanophotonics. 2024 Feb 7;13(4):477-485. doi: 10.1515/nanoph-2023-0885. eCollection 2024 Feb.
Structured light projection provides a promising approach to achieving fast and non-contact three-dimensional (3D) imaging. The resolution is a crucial index that represents security and accuracy in applications such as face recognition and robot vision. It depends on the density of dots in the projection. However, further improving the density of dots in the current system must be at the cost of speed or volume. Here, an all-dielectric ultra-thin metasurface is designed and fabricated to project a multi-wavelength dot array. The density of dots is improved because projected dots with different wavelengths fill the gaps with each other. The experimental results demonstrate that the multi-wavelength projection improves the resolution of 3D imaging. Furthermore, the multi-wavelength system is beneficial to measuring a surface with varying colors. The approach has the potential to achieve a new generation of high-resolution systems for tiny fluctuations and colorful 3D imaging in dark environments.
结构光投影为实现快速非接触式三维（3D）成像提供了一种很有前景的方法。分辨率是一个关键指标，它在诸如人脸识别和机器人视觉等应用中代表着安全性和准确性。它取决于投影中点的密度。然而，在当前系统中进一步提高点的密度必然要以速度或体积为代价。在此，设计并制造了一种全介质超薄超表面来投射多波长点阵列。由于不同波长的投射点相互填充间隙，所以点的密度得到了提高。实验结果表明，多波长投影提高了3D成像的分辨率。此外，多波长系统有利于测量颜色各异的表面。该方法有潜力实现新一代用于在黑暗环境中进行微小波动和彩色3D成像的高分辨率系统。
