Abstract
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.
Highlights
There are tremendous demands for augmented reality in education, design, clinics, vehicles, and exhibition
Glasses-free augmented reality is of great interest by fusing virtual 3D images naturally with physical world without the aid of any wearable equipment
We demonstrated that the displayed virtual 3D scene preserved natural motion parallax, and mixed well with the natural objects
Summary
There are tremendous demands for augmented reality in education, design, clinics, vehicles, and exhibition. In the field of glasses-free augmented reality, Koki Wakunami et al proposed a projection-type see-through holographic 3D display with an enlarged visual angle of 20.8° [27]. Yanfeng Su et al proposed a dual-view 3D display using a single spatial light modulator (SLM) to reconstruct the amplitude information by the layer-based Fresnel diffraction method [30]. These prototypes all worked under an illumination with narrow bandwidth. We propose a holographic combiner based on spatial multiplexing nanostructures for glasses-free augmented reality of both virtual and physical 3D objects. Propose glasses-free augmented reality based on metagratings over a large viewing angle. Crosstalk along the viewing angle can be defined as the following [31]: N
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
