All-optical object identification and three-dimensional reconstruction based on optical computing metasurface

Abstract

Object identification and three-dimensional reconstruction techniques are always attractive research interests in machine vision, virtual reality, augmented reality, and biomedical engineering. Optical computing metasurface, as a two-dimensional artificial design component, has displayed the supernormal character of controlling phase, amplitude, polarization, and frequency distributions of the light beam, capable of performing mathematical operations on the input light field. Here, we propose and demonstrate an all-optical object identification technique based on optical computing metasurface, and apply it to 3D reconstruction. Unlike traditional mechanisms, this scheme reduces memory consumption in the processing of the contour surface extraction. The identification and reconstruction of experimental results from high-contrast and low-contrast objects agree well with the real objects. The exploration of the all-optical object identification and 3D reconstruction techniques provides potential applications of high efficiencies, low consumption, and compact systems.

Random broadband filters based on combination of metasurface and multilayer thin films for hyperspectral imaging

“…Among the previously mentioned broadband random filters, metasurface stand out as artificial two-dimensional materials endowed with the remarkable ability to flexibly manipulate light and facilitate optical computations [35][36][37][38][39][40]. Due to the compatibility of complementary metal oxide semiconductor (CMOS), metasurface-based micro-spectrometers have shown great advantages of achieving snapshot spectral imaging without the need for spatial scanning.…”

Simultaneous Circular Dichroism and Wavefront Manipulation with Generalized Pancharatnam–Berry Phase Metasurfaces

“…Metasurfaces are the two-dimensional equivalent of metamaterials, possessing the remarkable ability to flexibly manipulate the amplitude, phase, and polarization of electromagnetic waves by periodically arranging subwavelength structures, which opens a new era of digital optics. − Many exotic phenomena and applications have been observed with metasurfaces, such as the compact spectrometer, , optical computing, , optical biosensing, , quantum entanglement, , asymmetric photonic spin–orbit interactions, − achromatic and ultrawide-angle lenses, − and simultaneous circular dichroism and wavefront manipulation. − Various structures, such as the quasi-split-ring resonator, helical surface arrays, and chiral stepped nanoaperture, have been proposed. However, these methods increase the complexity of design and fabrication due to the requirement of structures to break the n -fold ( n > 2) rotational and mirror symmetries or vertical symmetry.…”