The current AR/VR headsets on the market are still quite bulky and uncomfortable to wear. However, a breakthrough has been made by a research team using a revolutionary technology called a superlens. For the first time, this innovation is capable of handling the entire visible light spectrum, which could significantly reduce the size and weight of future AR/VR displays.
Despite recent advancements in making AR and VR headbands smaller, the optical challenges remain complex. The lenses used in these devices must focus all wavelengths of visible light, but each color behaves differently due to its unique wavelength. This leads to a common issue known as chromatic aberration, where different colors don’t converge at the same point, resulting in blurry or distorted images.
Traditionally, this problem has been addressed using multiple lenses with varying thicknesses, materials, and shapes, which increases the overall size and weight of the headset. But now, researchers from Harvard University’s John A. Paulson School of Engineering and Applied Science have introduced a new solution: metalenses.
A superlens is a flat lens that uses nanostructures to manipulate light and eliminate chromatic aberration. While superlenses aren't entirely new, this is the first time they've been successfully applied across the full visible spectrum. This development could lead to much lighter and more compact AR/VR headsets.
The key to this breakthrough lies in the surface treatment of the superlens. Researchers use arrays of titanium dioxide thin films, adjusting their height, shape, width, and spacing to control the refractive index. This allows all wavelengths of light to focus simultaneously, eliminating color distortion.
The next step for the team is to scale up the superlens to cover the entire range of human vision and increase its size. They believe a diameter of about 10mm will be necessary for practical use. Fortunately, Harvard has already licensed the technology to a startup, indicating strong potential for commercialization in the near future. With this advancement, we may soon see sleeker, more comfortable AR/VR devices that deliver sharper, clearer visuals.
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