Zheng Guoxing, Fu Rao, Deng Liangui, Li Gongfa, Li Zile
Opt Express. 2021 Feb 15;29(4):6147-6157. doi: 10.1364/OE.416084.
Conventional three-dimensional (3D) holography based on recording interference fringes on a photosensitive material usually has unavoidable zero-order light, which merges with the holographic image and blurs it. Off-axis design is an effective approach to avoid this problem; however, it in turn leads to the waste of at least half of the imaging space for holographic reconstruction. Herein, we propose an on-axis 3D holography based on Malus-assisted metasurfaces, which can eliminate the zero-order light and project the holographic image in the full transmission space. Specifically, each nanostructure in the metasurface acts as a nano-polarizer, which can modulate the polarization-assisted amplitude of incident light continuously, governed by Malus law. By carefully choosing the orientation angles of nano-polarizers, the amplitude can be both positive and negative, which can be employed to extinct zero-order light without affecting the intensity modulation for holographic recording. We experimentally demonstrate this concept by projecting an on-axis 3-layer holographic images in the imaging space and all experimental results agree well with our prediction. Our proposed metasurface carries unique characteristics such as ultracompactness, on-axis reconstruction, extinction of zero-order light and broadband response, which can find its market in ultracompact and high-density holographic recording for 3D objects.
基于在感光材料上记录干涉条纹的传统三维（3D）全息术通常存在不可避免的零级光，它与全息图像合并并使其模糊。离轴设计是避免此问题的有效方法；然而，这反过来又导致全息重建至少一半的成像空间被浪费。在此，我们提出一种基于马吕斯辅助超表面的同轴3D全息术，它可以消除零级光并在整个透射空间中投射全息图像。具体而言，超表面中的每个纳米结构都充当一个纳米偏振器，它可以根据马吕斯定律连续调制入射光的偏振辅助振幅。通过仔细选择纳米偏振器的取向角，振幅可以为正也可以为负，这可用于消除零级光而不影响全息记录的强度调制。我们通过在成像空间中投射同轴三层全息图像对这一概念进行了实验验证，所有实验结果与我们的预测吻合良好。我们提出的超表面具有超紧凑、同轴重建、零级光消除和宽带响应等独特特性，可在用于三维物体的超紧凑和高密度全息记录中找到市场。
