Hydrogel‐Based Dynamic Structural Color with Optical Janus Effect for Imaging Encryption/Concealment

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 29, 2024

Abstract Structural colors are widely used due to their eco‐friendliness, stability, and precise controllability. However, achieving dynamic structural typically requires complex fabrication processes high‐quality material preparation. Here, a simple bilayer structure containing hydrogel micropattern semi‐transparent ultrathin aluminum film is proposed that achieves the color with Janus effect. Combining experimental research theoretical analysis, it found by merely controlling electron‐beam exposure dose, colors, patterns these hydrogel‐based structures can be precisely rationally designed. Additionally, thickness swellability of individually regulated, enabling imaging encryption/concealment optical The stability cyclic performance this verified. environmental sensitivity, real‐time adjustability, make suitable for applications such as secure information transmission intelligent anti‐counterfeiting labels.

Language: Английский

Dynamic Color Regulation of the Lycaenid Butterfly Wing Scales

Journal of Bionic Engineering, Journal Year: 2024, Volume and Issue: unknown

Published: June 13, 2024

Abstract Butterfly coloration originates from the finely structured scales grown on underlying wing cuticle. Most researchers who study butterfly are focused static optic properties of cover scales, with few works referring to dynamic optical scales. Here, effect multiple was studied based measurements varying-angle reflection and characterization scale flexibility in two species Lycaenid, Plebejus argyrognomon violet wings Polyommatus erotides blue wings. We explored angle-dependent color changeability color-mediating efficiency It found that three main kinds flexible (cover, ground androconia scales) were asynchronously bent during rotation, which caused discoloration effect. The layers composite broaden light signal when compared single scale, may be great significance recognition insects. Specifically, shown strongly contribute overall coloration. ascribed coherence scattering resulted short-range order at intermediate spatial frequencies 2D Fourier power spectra. Our findings expected deepen understanding complex characteristics biological provide new inspirations for fabrication biomimetic materials.

Language: Английский

Controlling Isotropic Reflectivity with Multi‐Oriented Self‐Assembled Hexagonal Arrays in Plasmonic Metasurfaces

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 24, 2024

Abstract The fabrication of plasmonic metasurfaces on large surfaces is the next challenge to adapt them augmented reality systems. optical properties a self‐assembled hexagonal metasurface, realized with large‐area compatible approach, are compared at different levels and correlated‐disorder metasurface fabricated by electron‐beam lithography considered here as reference: contribution nanostructure arrangements studied using structure factor, physical assessed transmission reflection measurements, finally entire tested macroscopically in head‐up display system.

Language: Английский