In order to obtain a metasurface structure capable of filtering light of a specific wavelength range in the visible band, the traditional methods usually traverse the space consisting of possible designs, searching for a potentially satisfactory structure by performing iterative calculations to solve Maxwell's equations. In this article, we propose a systematic method based on neural networks that can complete an inverse design process to solve the problem. Compared with the traditional methods, our method is much faster while competent to encompass a high degree of freedom to generate device structures, which can ensure that the spectra of generated structures resemble the desired ones.
vision in augmented reality (AR) displays can enable highly immersive and realistic viewer experience, hence, attracts much attention. Most current approaches create 3D vision by projecting stereoscopic images to different eyes using two separate projection systems, which are inevitably bulky for wearable devices. Here, we propose a compact stereo waveguide AR display system using a single piece of thin flat glass integrated with a polarization-multiplexed metagrating in-coupler and two diffractive grating out-couplers. Incident light of opposite circular polarization states carrying stereoscopic images are first steered by the metagrating in-coupler to opposite propagation directions in the flat glass waveguide, subsequently extracted by the diffractive grating out-couplers, and finally received by different eyes, forming 3D stereo vision. Experimentally, we fabricated a display prototype and demonstrated independent projection of two polarization-multiplexed stereoscopic images. This work paves a novel path toward the implementation of high-performance stereo displays with compact size, lightweight, and multicolor compatibility.
In this paper, a
type of transparent colored static display consisting
of a flat glass waveguide and embedded multilayer gratings is presented,
by which multiple patterns and colors with a wide field of view (FOV)
can be displayed. The embedded grating is achieved by nanoimprinting
followed by deposition of a high refractive index dielectric layer.
The process can be repeated to produce multilayer gratings, which
are shaped into specific patterns to be displayed, and they are designed
to have proper periods and orientations to independently extract light
incident from different edges of the glass plate. Such transparent
display offers the advantages of low cost, easy fabrication and wide
FOV, and it is suitable for colored signage and decorative applications.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.