Orbital angular momentum (OAM) of an optical vortex has attracted great interest from the scientific community due to its significant values in high-capacity optical communications such as mode or wavelength division multiplexer/demultiplexer. Although several configurations have been developed to demultiplex an optical vortex, the multiwavelength high-order optical vortex (HOOV) demultiplexer remains elusive due to lack of effective control technologies. In this study, we present the design, fabrication, and test of metasurface optical elements for multiwavelength HOOV demultiplexing based on optical gyrator transformation transformations in the visible light range. Its realization in a metasurface form enables the combined measurement of OAM, the radial index p, and wavelength using a single optical component. Each wavelength channel HOOV can be independently converted to a high-order Hermitian–Gaussian beam mode, and each of the OAM beams is demultiplexed at the converter output. Furthermore, we extend the scheme to realize encoding of the three-digit gray code by controlling the wavelength or polarization state. Experimental results obtained at three wavelengths in the visible band exhibit good agreement with the numerical modeling. With the merits of ultracompact device size, simple optical configuration, and HOOV recognition ability, our approach may provide great potential applications in photonic integrated devices and systems for high-capacity and demultiplex-channel OAM communication.

针对快照式多维成像系统难以实现高维成像的问题，本文提出了一种快照式光谱光场成像方法，使用单个探测器实现了对目标场景光谱光场信息的快速获取。该方法将聚焦光场成像结构引入到快照式超光谱成像傅里叶变换光谱仪中，首先获取混叠了目标场景光场信息和干涉信息的原始图像，然后使用基于卷积神经网络的信息重建算法，将光场信息和干涉信息从原始图像中分别提取出来，并分别利用光场和干涉信息来重建目标场景的深度和光谱。本文搭建了快照式光谱光场成像系统，并对该系统在空间、光谱以及时间维度上的表现进行了实验验证。实验结果表明，该系统在将获取信息的维度扩展到七维的同时，其深度重建的均方根误差为7.7 mm，光谱重建的归一化均方根误差为6.87%。