Full-Stokes polarization transformations and time sequence metasurface holographic display

Abstract

With the development of micro/nano fabrication technology, metasurface holography has emerged as a revolutionary technology for the manipulation of light with excellent performance. However, for applications of full-Stokes polarization encryption and time sequence holographic display, multiplexing strategies of metasurfaces with large bandwidths and simple operations still need to be developed. As one of the most popular schemes of multiplexing, polarization multiplexed metasurfaces have shown flexible recording abilities for both free-space beam and surface waves. Here, by using a dielectric metasurface equipped with double phase holograms, we have achieved flexible polarization multiplexed transformations from one full-Stokes space to another. The vectorial hologram is optimized by a hybrid genetic algorithm and digitalized with subwavelength modulated units. Based on a quantitative map and remarkable information capacity, time sequence holographic display and complex optical encryption are experimentally demonstrated by changing input/output polarization channels in real time. We believe our method will facilitate applications in smart compact devices of dynamic display, dynamic optical manipulation, optical encryption, anticounterfeiting, etc.

Direct‐Printing Hydrogel‐Based Platform for Humidity‐Driven Dynamic Full‐Color Printing and Holography

“…Flat optics and metasurfaces, as representatives of planar nanophotonics, exhibit brilliant capability of arbitrarily manipulating light field in subwavelength scale, [1][2][3][4] thus promoting various applications for structural color, [5][6][7][8] beam steering, [9][10][11][12] meta-holography, [13][14][15][16][17][18] lensing, [19][20][21] etc. To endow the post-fabrication tuning ability of the optical devices, several tunable materials such as liquid crystals, [22][23][24][25][26][27][28] phase-change materials, [29][30][31] transparent conductive materials, [32,33] elastomeric polymer, [34][35][36] doped semiconductors, [37,38] and chemically-responsive materials [39] have been employed to construct the nanodevices.…”

Recent Advances and Prospects of Optical Metasurfaces

“…In general, owing to their structural symmetry, most single-layer metasurfaces have at most three independent polarization holographic channels without intensity crosstalk via algorithms . With the demand for more polarization channels, diverse subwavelength-encoding schemes compatible with more polarization channels and full-Stokes state emerge. ,,− For example, based on the linear additivity of the Fourier transformation, multiple polarized holograms can be superposed into two holograms with an orthogonal polarization basis. Using the Jones matrix of meta-atoms to appropriately record the two holograms, a full-Stokes polarized holographic display with innumerable frames can be reconstructed (Figure a). , Another method is to establish Jones matrix holography.…”

“…(a) Polarization multiplexing based on full-Stokes metasurfaces. Adapted with permission from ref . Copyright 2022 Chinese Laser Press.…”

Metasurface‐Assisted Indirect‐Observation Cryptographic System

“…However, these single‐channel metasurfaces suffer from the information leakage because there is only one working channel and the hidden information can be readily obtained. By contrast, multi‐channel metasurfaces, [ 22–42 ] which is implemented by multiplexing, can encrypt the information in different working modes, thus further enhancing the information security and capacity. For example, different information can be obtained by changing the incident beam's wavelength, [ 22–24 ] polarization, [ 25–28 ] incident angle, [ 29 ] or topological number.…”

“…By contrast, multi‐channel metasurfaces, [ 22–42 ] which is implemented by multiplexing, can encrypt the information in different working modes, thus further enhancing the information security and capacity. For example, different information can be obtained by changing the incident beam's wavelength, [ 22–24 ] polarization, [ 25–28 ] incident angle, [ 29 ] or topological number. [ 30,31 ] In addition, some multiplexing works have showcased by encrypting information into different observation spaces [ 32,33 ] or spatial frequency.…”