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A hermetic photonic crystal grating with transparent-color transition based on immediate response to changes in the light propagation medium

A photonic crystal, sealed technology, applied in the direction of diffraction grating, optics, optical components, etc., can solve the problems of restricting practical application, photonic crystal structural color materials cannot realize structural color hiding, etc., and achieve low cost, strong contrast, and transformation process reversible effect

Active Publication Date: 2021-08-17
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this type of structural color transformation, external stimuli directly act on photonic crystals, and it takes a certain amount of time for photonic crystals to respond to external stimuli until the color changes, which limits their practical applications to a certain extent.
Although photonic crystal structural color materials with short response times have been reported, the development of structural color anti-counterfeiting materials that do not directly act on photonic crystals and respond instantly remains a challenge.
[0004] In addition, photonic crystal structural color materials that can only change between different colors cannot realize the hiding of structural colors, which will be limited in some practical applications. great practical value

Method used

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  • A hermetic photonic crystal grating with transparent-color transition based on immediate response to changes in the light propagation medium
  • A hermetic photonic crystal grating with transparent-color transition based on immediate response to changes in the light propagation medium
  • A hermetic photonic crystal grating with transparent-color transition based on immediate response to changes in the light propagation medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Using polystyrene spheres as a template, tetrabutyl titanate as a titanium source, and ammonia as a catalyst, titanium dioxide-coated polystyrene microspheres with a particle size of 260 nm were prepared by a sol-gel method, and the titanium dioxide-coated polystyrene Styrene microspheres, water, and n-propanol are mixed and ultrasonically dispersed to prepare a dispersion containing titanium dioxide-coated polystyrene microspheres. The concentration of titanium dioxide-coated polystyrene microspheres is 10 wt%, and titanium dioxide-coated polystyrene microspheres The volume ratio of ball, water and n-propanol is 1:1:1;

[0041] (2) Assemble the photonic crystal array on the glass petri dish by using the air-liquid interface assembly method, the number of stacked layers of microspheres is 1 layer, and evaporate the solvent to obtain a single-layer photonic crystal array;

[0042] (3) Use a sealing film to seal the single-layer photonic crystal array in a glass petri...

Embodiment 2

[0045] (1) Polystyrene microspheres with a particle size of 280nm were prepared by emulsion polymerization. After mixing polystyrene microspheres, water and n-propanol, they were dispersed ultrasonically to prepare a dispersion containing polystyrene microspheres. The concentration of microspheres is 10wt%, and the volume ratio of polystyrene microspheres, water, and n-propanol is 1:1:1;

[0046] (2) A photonic crystal array is assembled on a glass petri dish by the pulling method, the number of stacked layers of microspheres is 33, and the solvent is evaporated to obtain a photonic crystal array;

[0047] (3) Use plastic wrap to seal the photonic crystal array in a glass petri dish to obtain a sealed photonic crystal grating. There is an air layer between the photonic crystal array and the sealing layer (plastic wrap), and put it in the air and water for observation Color changes from different angles.

[0048] Figure 4 (a) is the scanning electron microscope picture of th...

Embodiment 3

[0050] (1) Silica microspheres with a particle size of 320nm were prepared by the Stober method, and the silica microspheres, water, and n-butanol were mixed and then ultrasonically dispersed to prepare a dispersion containing silica microspheres. The concentration of spheres is 10wt%, and the volume ratio of silica microspheres, water, and n-butanol is 1:1:1;

[0051] (2) Assembling the photonic crystal array on the glass petri dish using the gas-liquid interface assembly method, the number of stacked layers of microspheres is 1 layer, and evaporating the solvent to obtain an assembled single-layer photonic crystal array;

[0052] (3) The pre-polymerization solution of the oligomer of ethoxylated trimethylolpropane triacrylate is added dropwise to the surface of the assembled single-layer photonic crystal array, and the pre-polymerization solution is made of ethoxylated trimethylolpropane Triacrylate, polyethylene glycol (200) diacrylate, butyl acrylate, and photoinitiator 11...

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Abstract

The invention discloses a transparent-color transition sealed photonic crystal grating based on immediate response to changes in light propagation media and an application thereof, belonging to the fields of information encryption and commodity anti-counterfeiting. The sealed photonic crystal grating is composed of a substrate, a photonic crystal array, an air layer and a sealing layer. The sealed photonic crystal grating is transparent in the air and exhibits bright structural colors in the liquid, so that the pattern hiding-revealing transition can be realized conveniently. The present invention only depends on the difference in the medium where the photonic crystal grating is located, so that the obvious color change from transparent to colored occurs immediately. The preparation method of the sealed photonic crystal grating of the present invention is simple and low in cost, and the instant color change from transparent to colored can be realized only by changing the light propagation medium; and because the light propagation medium is only used outside the material and does not penetrate into the photonic crystal array Internal, so the material can be used for a long time, and has obvious advantages in information encryption and commodity anti-counterfeiting.

Description

technical field [0001] The invention relates to a photonic crystal grating, in particular to a transparent-color transition sealed photonic crystal grating based on immediate response to changes in light propagation media. Background technique [0002] Nature is the source of inspiration for researchers to design novel materials and functions. By learning from nature, many biomimetic materials with attractive structural colors have been developed. Unlike chemical colorants such as dyes or pigments, structural coloring materials produce color through the interaction of light with regular microstructures on the surface of matter (such as thin film interference, diffraction grating, light scattering, etc.). As a structural color material whose refractive index changes periodically in space, photonic crystals have very important application values ​​in the fields of display, sensing, encryption, and anti-counterfeiting due to their environmental friendliness, non-fading, easy ad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B1/00G02B5/18
CPCG02B1/005G02B5/1814G02B5/1847G02B5/1857
Inventor 张淑芬张业广牛文斌
Owner DALIAN UNIV OF TECH