Metasurface for Imaging and AR/VR Devices

Abstract

Metasurfaces are the arrangement of the artificially fabricated nanoantenna, which can control light scattering characteristics in a compact manner. Thanks to their versatile functionalities, the applications of the metasurfaces have been studied to replace various optical devices, including imaging and AR/VR devices. In this talk, we will introduce our research on metasurface holograms and metalenses related to imaging and AR/VR. First, the metasurface that combines the Pancharatnam-Berry phase and the generalized Kerker effect is not limited to control either transmission or reflection side but allows light control over the entire space. Utilizing this platform, independent hologram images and beam deflections for transmission and reflection are demonstrated. Also, a quadrumer structure that vertically transmits light that is incident at a specific angle is designed. We present a device that reproduces different holograms depending on the angle of incidence by encoding the multiplexed four phase profiles with the detour phase principle. Next, in the doublet metalens scheme, one side corrects chromatic aberration and monochromatic aberrations, and the other side performs focusing and filtering of the three primary colors in the visible spectrum. This doublet metalens corrects the aberrations of the targeted colors while having a high numerical aperture (NA). Finally, the metalens eyepiece with a high numerical aperture can realize a compact system to combine a real scene and a virtual image. In addition, our metalens shows a wide field-of-view, which can overcome the flaws of existing AR devices. These metasurface applications would be upstanding solutions for optical display technology.