Augmented reality system based on the integration of polarization-independent metalens and micro-LEDs

Sheng-Hui Li, Chi Sun, Pei-Yu Tang, Jui-Hsun Liao, Yu-Hsiang Hsieh, Bo-Heui Fung,Yen-Hsiang Fang,Wei-Hung Kuo,Ming-Hsien Wu, Hsueh-Chih Chang,Guo-Dung J. Su

OPTICS EXPRESS(2024)

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摘要
Augmented reality (AR), a technology that superimposes virtual information onto a user's direct view of real-world scenes, is considered one of the next-generation display technologies and has been attracting considerable attention. Here, we propose a flat optic AR system that synergistically integrates a polarization-independent metalens with micro lightemitting diodes (LEDs). A key component is a meticulously designed metalens with a numerical aperture of 0.25, providing a simulated focusing efficiency of approximately 76.5% at a wavelength of 532 nm. Furthermore, the laser measurement system substantiates that the fabricated metalens achieves a focusing efficiency of 70.8%. By exploiting the reversibility of light characteristics, the metalens transforms the divergent light from green micro-LEDs into a collimated beam that passes through the pupil and images on the retina. Monochromatic pixels with a size of 5x5 mu m2 and a pitch of 10 mu m can be distinctly resolved with a power efficiency of 50%. This work illustrates the feasibility of integrating the metalens with microdisplays, realizing a high-efficiency AR device without the need for additional optical components and showcasing great potential for the development of near-eye display applications.
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