Multi‐Dimensional Multiplexed Metasurface Holography by Inverse Design

Abstract

Multi‐dimensional multiplexed metasurface holography extends holographic information capacity, promises revolutionary advancements for vivid imaging, information storage and encryption. However, achieving multifunctional metasurface holography by forward design method is still difficult since it relies heavily on Jones matrix engineering, which places high demands on physical knowledge and processing technology. To break these limitations and simplify the design process, here we propose an end‐to‐end inverse design framework. By directly linking the metasurface to the reconstructed images and employing a loss function to guide the update of metasurface, the calculation of hologram can be omitted, thus greatly simplifying the design process. In addition, the requirements on the completeness of meta‐library can also be significantly reduced, allowing multi‐channel hologram to be achieved using meta‐atoms with only two degrees of freedom, which is very friendly to processing. By exploiting the proposed method, metasurface hologram containing up to 12 channels of multi‐wavelength, multi‐plane and multi‐polarization are designed and experimentally demonstrated, which exhibits the state‐of‐the‐art information multiplexing capacity of the metasurface composed of simple meta‐atoms. Our method is conducive to promoting the intelligent design of multifunctional meta‐devices, and it is expected to eventually accelerate the application of meta‐devices in colorful display, imaging, storage and other fields.This article is protected by copyright. All rights reserved

Varifocal Metalens for Compact and Accurate Quantitative Phase Imaging

“…To attain a more compact imaging system, there is a growing application of metasurface multiplex techniques in this field. , Metasurfaces are artificially designed optical devices that effectively manipulate various dimensions of the optical field, including phase, amplitude, wavelength, and polarization, through subwavelength-sized resonant units . As a highly integrated planar optical device, there is extensive research on its applications in holographic displays, − optical computing, − biosensing, − and optical imaging fields. − Inspired by differential interference contrast (DIC), the Faraon group utilized two metasurface layers to achieve quantitative phase gradient imaging in one direction. Recent work by the Yang group used a polarization camera to optimize integration, resulting in highly integrated single-shot quantitative phase gradient imaging.…”