Original title: A 0.35 mm Silicon Carbide Diffractive Waveguide with Dual Parameter Apodization for Full Color Augmented Reality
Xiaoxuan Li, Ce Li, Yinggang Chen, Chenting Fang +4 · September 2026
Augmented reality glasses overlay digital images onto the real world. To do this, they use waveguides, which are thin transparent lenses that guide light into your eyes. Silicon carbide is a great material for these lenses because it bends light well and handles heat effectively. However, single-layer lenses made from it are normally thicker than 0.5 mm to stop pictures from looking blotchy and uneven. Researchers solved this by making an ultra-lightweight silicon carbide lens that is just 0.35 mm thick and weighs only 1.98 g. They etched tiny grooves with smoothly changing depths and widths across the surface. This carefully steers how much light escapes at each point, giving a smooth full-color picture across a 30-degree field of view.
Imagine looking at a photo through a window that has tiny scratches covering its surface. If the scratches are all the same, the image is evenly blurred. But if the scratches vary in depth and spacing, some parts become too bright while others are too dim, making the image uneven. In this paper, the window is a thin silicon carbide sheet that guides light from a projector to the eye. The scratches are microscopic patterns etched onto the sheet, and by carefully varying their depth and spacing, the researchers control how light is scattered at each point, achieving a uniform full-color image.
Current augmented reality glasses are often bulky and heavy, limiting their everyday use. This paper shows a way to make them much thinner and lighter while still displaying full color. That means AR glasses could eventually look and feel like normal eyewear, opening the door for comfortable all-day wear in navigation, communication, and information access.
The findings are based on optical simulations rather than experimental measurements of a fabricated device. The field of view is limited to 30 degrees, which may be less than some consumer expectations. The scalable manufacturing method is described but its yield, reliability, and performance in real-world conditions are not quantified.
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A 0.35 mm Silicon Carbide Diffractive Waveguide with Dual Parameter Apodization for Full Color Augmented Reality — Xiaoxuan Li, Ce Li, Yinggang Chen et al.
Abstract licence: CC0
Explanation generated by Synthesis from the abstract — it is not the original paper. This is a preprint, so it hasn't necessarily been peer reviewed.