用于近眼增强现实的元表面
Metasurfaces for near-eye augmented reality
摘要：
增强现实（AR）具有通过将虚拟信息叠加到人对其实时环境的直接视图上来彻底改变信息呈现方式的潜力。通过将显示器放置在眼睛表面上，隐形眼镜显示器（CLD）为紧凑型AR提供了多功能解决方案。然而，由于眼睛的调节有限，裸眼无法看到CLD上的图案。在这里，我们介绍一种全息显示技术，它将虚拟信息直接投射到视网膜上，使眼睛看到它，同时保持真实世界的可视化。我们设计的关键是引入元表面来创建一个相位分布，以逐像素的方式投射虚拟信息。与传统的全息技术不同，我们的基于超表面的技术能够使用单个被动全息图显示任意图案。通过小的形状因子，所设计的超表面使近眼AR不需要额外的光学元件，例如空间光调制器，用于动态图像控制。
英文摘要：
Augmented reality (AR) has the potential to revolutionize the way in which information is presented by overlaying virtual information onto a person's direct view of their real-time surroundings. By placing the display on the surface of the eye, a contact lens display (CLD) provides a versatile solution for compact AR. However, an unaided human eye cannot visualize patterns on the CLD simply because of the limited accommodation of the eye. Here, we introduce a holographic display technology that casts virtual information directly to the retina so that the eye sees it while maintaining the visualization of the real-world intact. The key to our design is to introduce metasurfaces to create a phase distribution that projects virtual information in a pixel-by-pixel manner. Unlike conventional holographic techniques, our metasurface-based technique is able to display arbitrary patterns using a single passive hologram. With a small form-factor, the designed metasurface empowers near-eye AR excluding the need of extra optical elements, such as a spatial light modulator, for dynamic image control.
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