11/2/2023 0 Comments Harvard seas meta materialsThis breakthrough extends those advantages across the whole visible range of light. “Metalenses are thin, easy to fabricate, and cost effective. Wallace Professor of Applied Physics and Vinton Hayes Senior Research Fellow in Electrical Engineering at SEAS, as well as senior author of the research. “Metalenses have advantages over traditional lenses,” says Federico Capasso, the Robert L. It also paves the way for more immersive virtual reality (VR) and augmented reality (AR) applications. The breakthrough means bulky stacked lenses could soon be replaced with simpler, flat metalenses - without loss of resolution. Paulson School of Engineering and Applied Sciences (SEAS) have built the first single lens that can focus the entire visible spectrum of light. Image courtesy of Jared Sisler/Harvard SEAS It uses arrays of titanium dioxide nanofins to equally focus wavelengths of light and eliminate chromatic aberration. The Harvard Office of Technology Development has protected the intellectual property relating to this project and is exploring commercialization opportunities.Follow me on Twitter This flat metalens is the first single lens that can focus the entire visible spectrum of light - including white light - in the same spot and in high resolution. Next, the team is planning to scale up the lens even further, making it compatible with current large-scale fabrication techniques for mass production at a low cost. “We have demonstrated how meta-optics platforms can help resolve the bottleneck of current VR technologies and potentially be used in our daily life,” said Li. To the human eye, the image appears as part of the landscape in the AR mode, some distance from our actual eyes. The patterns scanned by the display are focused onto the retina, where the virtual image forms, with the help of the metalens. In a VR or AR platform, the metalens would sit directly in front of the eye, and the display would sit within the focal plane of the metalens. The display has high resolution, high brightness, high dynamic range, and wide color gamut. When a voltage is applied onto the tube, the fiber tip scans left and right and up and down to display patterns, forming a miniaturized display. The display, inspired by fiber-scanning-based endoscopic bioimaging techniques, uses an optical fiber through a piezoelectric tube. The display uses an optical fiber through a piezoelectric tube. To incorporate the lens into a VR system, the team developed a near-eye display using a method called fiber scanning. By engineering the shape and pattern of these nanoarrays, the researchers could control the focal length of red, green and blue color of light. Like previous metalenses, this lens uses arrays of titanium dioxide nanofins to equally focus wavelengths of light and eliminate chromatic aberration. “This is the largest RGB-achromatic metalens to date and is a proof of concept that these lenses can be scaled up to centimeter size, mass produced, and integrated in commercial platforms.” “Using a new design principle, we have developed a flat lens to replace the bulky lenses of today’s optical devices,” said Zhaoyi Li, a postdoctoral fellow at SEAS and first author of the paper. Wallace Professor of Applied Physics and Vinton Hayes Senior Research Fellow in Electrical Engineering, and senior author of the paper. “This state-of-the-art lens opens a path to a new type of virtual reality platform and overcomes the bottleneck that has slowed the progress of new optical device,” said Capasso, who is the Robert L. The research is published in Science Advances. Now, the researchers have developed a two-millimeter achromatic metalenses that can focus RGB wavelengths without aberrations and developed a miniaturized display for virtual and augmented reality applications. But these lenses were only tens of microns in diameter, too small for practical use in virtual and augmented reality systems. In 2018, the Capasso’s team developed achromatic, aberration-free metalenses that work across the entire visible spectrum of light. Paulson School of Engineering and Applied Sciences (SEAS), a team of researchers led by Federico Capasso, has been developing “meta lenses” that promise replace bulky curved lenses with a simple, flat surface that uses nanostructures to focus light. AR imaging result using the full-color near-eye fiber scanning display.At the Harvard John A.
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