Stimulus-responsive polymer materials toward multi-mode and multi-level information anti-counterfeiting: recent advances and future challenges

Chemical Society Reviews, Journal Year: 2023, Volume and Issue: 53(2), P. 606 - 623

Published: Dec. 15, 2023

This review highlights the recent advances and discusses challenges perspectives of stimulus-responsive polymer (SRP)-based information-storage materials, which exhibit multi-mode or multi-level anti-counterfeiting performance.

Language: Английский

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Hydrogels for active photonics

Microsystems & Nanoengineering, Journal Year: 2024, Volume and Issue: 10(1)

Published: Jan. 1, 2024

Abstract Conventional photonic devices exhibit static optical properties that are design-dependent, including the material’s refractive index and geometrical parameters. However, they still possess attractive responses for applications already exploited in across various fields. Hydrogel photonics has emerged as a promising solution field of active by providing primarily deformable geometric parameters response to external stimuli. Over past few years, studies have been undertaken attain stimuli-responsive with tunable properties. Herein, we focus on recent advancements hydrogel-based micro/nanofabrication techniques hydrogels. In particular, fabrication hydrogel categorized into film growth, photolithography (PL), electron-beam lithography (EBL), nanoimprint (NIL). Furthermore, provide insights future directions prospects photonics, along their potential practical applications.

Language: Английский

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Flexible Ionic Conductive Hydrogels with Wrinkled Texture for Flexible Strain Transducer with Language Identifying Diversity

Chemistry of Materials, Journal Year: 2024, Volume and Issue: 36(9), P. 4703 - 4713

Published: April 24, 2024

Conductive hydrogels have garnered significant attention in the realm of flexible electronic strain transducers (FESTs). However, development such FEST has been hindered by weak mechanical performance and low conductivity, sensitivity, stability. In this study, we introduce a novel hydrogel with wrinkled surface possessing unique ability to differentiate between different spoken written languages. Our approach involved fabricating robust, tough, ionic conductive texture through simple strategy utilizing hydrophobic initiator benzophenone (BP). BP was incorporated into hydrophobically cross-linked composed lauryl methacrylate (LMA), acrylamide (Amm), cationic monomer 2-(dimethylamino) ethyl acrylate methochloride (DMAEAMC), reinforced trimesic acid (TMA). Pluronic 123 (P123) served as source micelles, dynamically connecting polymer chains facilitating diffusion produce textured hydrogels. Furthermore, LiCl salt induced conductivity (0.18 S/m), while synergistic effect TMA enhanced electrostatic interactions DMAEAMC chains. The combination enabled stretch up 1611% high remarkable sensitivity (GF = 4.98 at 500%), wide range (0.1 500%). These are valuable candidates for integration epidermal devices. Moreover, capability monitor various large joint movements well physiological activities. Additionally, can identify languages, including English, Urdu, Pashto, respond other handwriting styles alphabets, numbers, signatures. This provides promising roadmap engineering diverse applications, especially fields sensors, skin, biomedical

Language: Английский

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Electrical-Driven Dynamic Augmented Reality by On-Chip Vectorial Meta-Display

ACS Photonics, Journal Year: 2024, Volume and Issue: 11(5), P. 2123 - 2130

Published: April 25, 2024

Waveguide-integrated on-chip meta-optics exhibit a promising platform for achieving high-performance and compact optical display devices. However, heading toward advanced wearable smart technology, its broad implementation is critically restricted by the lack of practical active tuning capability. Despite previous endeavors, still face crucial challenges in any arbitrary vectorial wavefront with dynamic switchable ability. Here, liquid crystal (LC)-driven metasurface integrated on waveguide proposed demonstrated augmented reality (AR) meta-holograms. By engineering meta-diatoms at nanoscale, simultaneous modulation polarization phase out-coupling lightwave can be achieved up to nine-channel fully polarized As proof concept, combination an electrical-driven LC platform, actively switch holographic images floating actual-world scene real-time as AR meta-displays. Moreover, owing propagation scheme, projected holograms are uniquely free from zero-order diffraction interference. It envisioned that such meta-displays allow miniaturized integration promise potential applications intelligent displays, multiplexing information storage/encryption, next-generation displays.

Language: Английский

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Switchable unidirectional emissions from hydrogel gratings with integrated carbon quantum dots

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Jan. 29, 2024

Abstract Directional emission of photoluminescence despite its incoherence is an attractive technique for light-emitting fields and nanophotonics. Optical metasurfaces provide a promising route wavefront engineering at the subwavelength scale, enabling feasibility unidirectional emission. However, current directional strategies are mostly based on static metasurfaces, it remains challenge to achieve emissions tuning with high performance. Here, we demonstrate quantum dots-hydrogel integrated gratings actively switchable simultaneously narrow divergence angle less than 1.5° large diffraction greater 45°. We further that grating efficiency alteration leads more 7-fold intensity order due variation hydrogel morphology subject change in ambient humidity. Our proposed strategy can promote technologies active devices radiation control optical imaging.

Language: Английский

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Chemically and geometrically programmable photoreactive polymers for transformational humidity-sensitive full-color devices

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: July 31, 2024

Humidity-sensitive structural color has emerged as a promising technology due to its numerous advantages that include fast response, intuitiveness, stand-alone capability, non-toxicity, well resistance thermal and chemical stresses. Despite immense technological advancements, these colors lack the ability present independent multiple images through transformation. Herein, we an approach address this constraint by introducing chemically geometrically programmable photoreactive polymer which allows preparation of transformational humidity-sensitive full-color devices. Utilizing azido-grafted carboxymethyl cellulose (CMC-N

Language: Английский

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Structural Colors Go Active

Advanced Science, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 4, 2025

Abstract Structural colors find wide applications for color printing, intelligent display, filtering imaging, etc., owing to their benefits, including high resolution, stable properties, and dynamic tunability. This review first illustrates the mechanisms of structural generation, such as surface plasmon resonances, localized Fabry‐Perot Mie etc. It then proposes recent technological strategies employed realize colors. The integration with functional materials like phase‐change, along development control microfluidic chips, micro‐electro‐mechanical system drivers, microheaters, represents key approaches spectrum regulation. Furthermore, assesses performance, advantages, limitations various technologies Finally, this concluded a section on future challenges prospects in large‐area fabrication, practical applications, performance improvement. explains current typical smart windows, adaptive camouflage, sensors, explores processing methods that can achieve large‐area, high‐fidelity preparation colors, nanoimprint, deep ultraviolet lithography, immersion laser field promises advancements high‐density data storage, information encryption, broader market applications.

Language: Английский

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Compression-Encrypted Meta-Optics for Storage Efficiency and Security Enhancement

ACS Photonics, Journal Year: 2024, Volume and Issue: 11(2), P. 688 - 695

Published: Jan. 23, 2024

Information security is of vital importance in daily life, stimulating various cryptographic strategies to protect data from leaking. Among them, metasurface-based optical encryption an excellent candidate because its unique features, including numerous encoding channels and incomparable light-field manipulation ability. However, for state-of-the-art metasurface encryption, it still critical further improve storage efficiency with high practical information-storage applications. Here, combining compression compression-encrypted meta-optics (CEM) proposed the regular by order magnitude while maintaining information security. Utilizing lossless algorithms, plaintexts are re-encoded into nonintuitive ciphertexts keys much less volume (∼1/10), thus providing first barrier increasing efficiency. Moreover, polarization-encrypted metasurfaces also direct observation, a second barrier. Overall, such CEM two barriers significantly improves presents novel route potential applications next-generation storage/encryption.

Language: Английский

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On-Chip Meta-Optics for Engineering Arbitrary Trajectories with Longitudinal Polarization Variation

Nano Letters, Journal Year: 2024, Volume and Issue: 24(6), P. 2063 - 2070

Published: Feb. 1, 2024

On-chip integrated meta-optics promise to achieve high-performance and compact photonic devices. To arbitrarily engineer the optical trajectory along propagation path in an on-chip scheme is of significance fundamental physics various emerging applications. Here, we experimentally demonstrate metasurface on a waveguide enable predefined arbitrary trajectories visible regime. By transformation transverse phase generate longitudinal mapping, guided waves are extracted molded into any different (parabola, hyperbola, cosine). More intriguingly, polarization states with variation also successfully imparted trajectory. Owing scheme, uniquely free from zero-order diffraction interference, naturally having higher signal-to-noise ratio beyond conventional free-space forms. Overall, such engineering allows for miniaturized integration can find paths potential applications complex manipulation, advanced laser fabrication, microscopic imaging.

Language: Английский

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Dye-free and reprintable multi-color DLP 3D printing using ZnCl2-based polymerizable deep eutectic solvents and type I photoinitiators

Chemical Engineering Journal, Journal Year: 2023, Volume and Issue: 472, P. 144987 - 144987

Published: July 25, 2023

Language: Английский

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