![]() ![]() With their ultra-thin formfactor, subwavelength modulation scale and high modulation flexibility, metalenses have been suggested as key components in near-eye visors targeted for AR and VR applications. Metal metalenses usually suffer from low transmission efficiency due to their strong intrinsic absorption in the visible region, while all-dielectric metalenses are gaining ever-increasing research attention with high transparency. Recently, the materials used for fabricating metalenses have been extended from metals to all-dielectric. Metalenses, which can realize light focusing within an ultra-compact dimension, have opened up a wide range of applications including imaging, sensing and spectroscopy and have been extensively studied. ![]() ![]() Various metasurface devices, such as gratings, lenses, holograms, and optical vortex plates, have been developed to realize versatile functionalities. They can precisely control the wavefront of light via subwavelength structures with high degrees of freedom. Metasurfaces are ultra-thin planar elements that could overcome the limitations of refractive optics and conventional diffractive optics. To reduce the weight and volume of VR and AR headsets, compact optical elements are in urgent need. While VR is immersive, AR enables users to see both the digital information and the surrounding real world. Their widespread applications include but are not limited to healthcare, education, entertainment, and military training. Recently, virtual reality (VR) and augmented reality (AR) are revolutionizing the way we perceive and interact with the world. This work reveals the great potential of multi-functional metasurface devices which enables optical integration in interdisciplinary applications including wearable displays, biological imaging, and aeronautic optical instruments. We have implemented a proof-of-concept AR display system employing the metalens-visor, and experimentally demonstrated color AR images with good image quality. Hence, this single piece metalens-visor can perform the function of two integrated elements simultaneously: an eyepiece and an optical combiner, which in turn greatly reduces the weight and the size of an AR display. It achieves diffraction-limited focusing behavior for the reflected red light, while keeping a good transmission spectrum in the visible region. In this work, we proposed and fabricated a novel reflective dielectric metalens-visor based on Pancharatnam-Berry phase with see-through capability. Metalenses, with an ultra-thin formfactor, subwavelength modulation scale, and high modulation flexibility, are promising candidates to replace the conventional optics in AR display systems. However, these near-eye displays are often bulky and heavy, and thus are not suitable for long-term wearing. Virtual reality (VR) and augmented reality (AR) have found widespread applications in education, engineering, healthcare, and entertainment. ![]()
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