Immersion‐Triggered Active Switch for Spin‐Decoupled Meta‐Optics Multi‐Display

Abstract

Meta‐optics exhibits many promising applications in various fields of optical displays, imaging, and information encryption. However, heading towards next‐generation intelligent displays, its broad implementation is critically restricted by the lack of practical active tuning capability. Beyond the conventional electrical/optical/mechanical/thermal tuning methods, liquid immersion has recently emerged as a facile mechanism for active spectral tuning. To further conquer the challenge in achieving active complicated optical‐field manipulation, here, an environment‐compliant switch for meta‐optics multi‐display is originally proposed and experimentally realized via the liquid immersion tuning scheme. By designing the spin‐decoupled phase array for left‐/right‐handed circular polarizations, it flexibly presents quad‐fold independent‐encoded phase distributions for different medium‐relevant and polarization‐controlled channels, thus enabling four switchable holographic images through immersion tuning. Such a proposed immersion tuning design is quite a straightforward approach for meta‐optics holographic displays, enjoying full‐spatial usage, design flexibility, and large‐scale facile implementation. Overall, the proposed liquid immersion tuning strategy for a meta‐optics multi‐display would strongly benefit the practical applications in biochemical sensing, environment‐adaptive displays, and information encryption.

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.…”

Hydrogel‐Based Reconfigurable Visualization with Pixel‐Scale Programmability by Vapor Exhalation

“…As an oversimplified tuning approach, the active tuning method via water stimuli has recently attracted increasingly broad interest. A typical way is water immersion through injecting water onto a metasurface, [27][28][29][30][31][32][33][34] which essentially alters the effective environmental refractive index around the nanostructures and thus possibly enhances the existing optical response from plasmonic resonance, Mie resonance, or Fano resonance. In contrast, another emerging scheme has been proposed more recently to employ humidity-responsive materials such as hydrogel film, whose thickness can actively swell/shrink by absorbing/emitting water molecules from the moist environment.…”

Double‐Key Optical Information Encryption Enabled by Multi‐State Excitation–Emission of Mn‐Doped Metal Chlorides

“…Luminescent materials with externally stimulated controllable color have a great potential in information security, data encryption, and anti-counterfeiting. The luminous states of these materials can be changed by external stimuli such as temperature, [23][24][25] moisture, [26][27][28] and PH value, [29][30][31] which can store and deliver data in a secure manner, achieving impressive protection of confidential information. Wang et al synthesized a hydrogel by copolymerization of acrylamide, acrylic acid, N,N′-methylenebisacrylamide and compound 4-(pyren-1-yl)pyridine, which shows switchable color between green and yellow by adjusting the PH value.…”