Phase Manipulation‐Based Polarization Profile Realization and Hybrid Holograms Using Geometric Metasurface

Abstract

The outstanding ability of optical metasurfaces to tailor light's amplitude, phase, and polarization with a subwavelength resolution has attracted big interest. A multifunctional metasurface device is reported and experimentally demonstrated that integrates an arbitrary polarization profile for image concealment and a computer‐generated hybrid hologram. Herein, a high‐resolution image is hidden in the polarization profile of the light beam, while the holographic images are encoded in its phase profile for the reconstruction of two different types of holographic images. The designed polarization profile is realized based on the superposition of two different phase profiles for circular polarization states with opposite handedness. This method can further extend the design degree of freedom in optical metasurfaces, which may open an alternative avenue for anticounterfeiting, optical image encoding, and optical information security.

Color-selective three-dimensional polarization structures

“…The lattice constant is 300 nm along both x and y directions. The designed metasurfaces can operate in the whole visible region 26 , 31 and their response spectrum is provided in Supplementary Section 1 . The designed devices are fabricated based on the standard electron-beam lithography, followed by the electron-beam deposition and the lift-off process.…”

Metasurface-Enabled 3-in-1 Microscopy

“…To realize the ultrathin multifunctional optical device, we utilize a geometric MS consisting of gold nanorods with spatially variant orientations sitting on an ITO-coated glass substrate. Each nanorod can be considered as the combination of a perfect polarizer (low percentage) and a piece of normal flat glass slab that can only add a uniform phase profile (not spatially variant phase profile). , Thus, the Jones matrix of each nanorod ( J rod ) can be written as J normalr normalo normald = A [ lefttrue 1 0 0 1 ] + B [ lefttrue cos 2 ⁡ δ sin ⁡ δ ⁢ cos ⁡ δ sin ⁡ δ ⁢ cos ⁡ δ sin 2 ⁡ δ ] where δ is the orientation angle of each nanorod with respect to the x axis. true0.25ex 1 0 0 1 false] is the unit matrix of the flat glass slab.…”

“…The size of each pixel is 300 nm along both x and y directions. The designed MSs can operate in the whole visible region , and their response spectrum is provided in the Supporting Information Section 1. The designed devices are fabricated based on the standard electron beam lithography, followed by the film deposition and the lift-off process.…”

Influencing Effects of Fabrication Errors on Performances of the Dielectric Metalens

“…The metasurface can control the phase, amplitude, and polarization of the incident electromagnetic wave by changing the dimension parameters and orientations of the resonant units [16,17], so as to realize singular electromagnetic characteristics. At present, in miniaturized and integrated optical systems, metasurfaces have been designed to achieve polarization transformation [18], optical focusing [19][20][21], holographic imaging and filtering [22][23][24]. Typically, metasurface-based devices perform these functions, including flat, sub-wavelength size, and higher focusing efficiency [25][26][27][28][29], which are beneficial for the development of integrated devices.…”