Abstract Glasses-free augmented reality is of great interest by fusing virtual 3D images naturally with physical world without the aid of any wearable equipment. Here we propose a large-scale spatial multiplexing holographic see-through combiner for full-color 3D display. The pixelated metagratings with varied orientation and spatial frequency discretely reconstruct the propagating lightfield. The irradiance pattern of each view is tailored to form super Gaussian distribution with minimized crosstalk. What’s more, spatial multiplexing holographic combiner with customized aperture size is adopted for the white balance of virtually displayed full-color 3D scene. In a 32-inch prototype, 16 views form a smooth parallax with a viewing angle of 47°. A high transmission (>75%) over the entire visible spectrum range is achieved. We demonstrated that the displayed virtual 3D scene not only preserved natural motion parallax, but also mixed well with the natural objects. The potential applications of this study include education, communication, product design, advertisement, and head-up display.

中文翻译：

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用于无眼镜增强现实的空间复用全息组合器

摘要 裸眼增强现实技术通过将虚拟 3D 图像自然地与物理世界融合而无需任何可穿戴设备的帮助而备受关注。在这里，我们提出了一种用于全彩色 3D 显示的大规模空间复用全息透视组合器。具有不同方向和空间频率的像素化元光栅离散地重建传播光场。每个视图的辐照度模式都经过定制，以形成具有最小串扰的超高斯分布。更重要的是，虚拟显示的全彩3D场景的白平衡采用定制孔径大小的空间复用全息组合器。在一个 32 英寸的原型机中，16 个视图形成一个平滑的视差，视角为 47°。在整个可见光谱范围内实现了高透射率 (>75%)。我们证明了显示的虚拟 3D 场景不仅保留了自然运动视差，而且与自然物体混合得很好。这项研究的潜在应用包括教育、传播、产品设计、广告和抬头显示。