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Sub-wavelength grating true color element and color generating product containing same

A subwavelength grating and component technology, applied in the field of color products, can solve the problems of only red and green changes, insufficient color types of optical anti-counterfeiting components, single color types and changing effects, etc., and achieve the effect of improving saturation and brightness.

Inactive Publication Date: 2013-04-17
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
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Problems solved by technology

Chinese patent application 200910209648.9 discloses an optical anti-counterfeiting element, which consists of a base layer and a two-dimensional dielectric grating layer (a single-layer dielectric film with a two-dimensional surface relief grating), which has a color change effect when viewed under a polarizer, but due to A single-layer dielectric film structure is adopted, resulting in a single color type and change effect, only red and green changes
Chinese patent application 201110410055.6 discloses an optical anti-counterfeiting element, which is composed of a substrate, a subwavelength relief structure on the substrate and a multi-layer dielectric film layer on the relief, to solve the problem that the color types of the existing optical anti-counterfeiting elements are not rich enough

Method used

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  • Sub-wavelength grating true color element and color generating product containing same
  • Sub-wavelength grating true color element and color generating product containing same
  • Sub-wavelength grating true color element and color generating product containing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] see figure 2 , the depths of structural layers 5-11 are 0.5 μm, 0.08 μm, 0.055 μm, 0.02 μm, 0.06 μm, 0.02 μm and 0.6 μm in sequence; the period Λ is 0.33 μm, f is 0.5; the material “Metal” is Ag; the medium n 1 and n 2 PMMA (1.49); medium n 5 , n 6 and n 7 is BOPP(1.5); medium n' 2 , n' 3 , n' 4 and n' 5 TiO 2 (2.3); the incident light wavelength is 0.38-0.8 μm, and the incident angle θ is 5°.

[0034] image 3 It is the spectrum and chromaticity diagram of s and p polarized light and unpolarized light of the subwavelength grating true color element. see image 3 , the spectrum of s-polarized light has a significant peak near 0.608 μm (efficiency is close to 95%), and the corresponding color position on the CIE x-y chromaticity diagram is (0.54, 0.43), that is, orange-red (RGB value is 255, 74 and 0); the spectrum of p-polarized light has sharp peaks near 0.512 μm and 0.635 μm (efficiency is close to 50%), and the corresponding color position on the CIE x-y...

Embodiment 2

[0036] see figure 2 , the depths of structural layers 5-11 are 0.5 μm, 0.06 μm, 0.09 μm, 0.015 μm, 0.045 μm, 0.015 μm and 0.6 μm in sequence; the period Λ is 0.25 μm, f is 0.5; the material “Metal” is Ag; the medium n 1 and n 2 for SiO 2 (1.46); medium n 5 , n 6 and n 7 for MgF 2 (1.38); medium n' 2 , n' 3 , n' 4 and n' 5 ZrO 2 (2.0); the incident light wavelength is 0.38-0.8 μm, and the incident angle θ is 5°.

[0037] Figure 4 It is the spectrum and chromaticity diagram of s and p polarized light and unpolarized light of the subwavelength grating true color element. see Figure 4 , the spectrum of s-polarized light has a sharp peak near 0.428 μm (efficiency is close to 80%), and the corresponding color position on the CIE x-y chromaticity diagram is (0.25, 0.16), that is, blue-violet (RGB value is 116, 39 and 255); the spectrum of p-polarized light has a higher efficiency value between 0.6-0.8 μm, and the corresponding color position on the CIE x-y chromatici...

Embodiment 3

[0039] see figure 2 , the depths of structural layers 5-11 are 0.8 μm, 0.12 μm, 0.16 μm, 0.025 μm, 0.095 μm, 0.025 μm and 0.8 μm in sequence; the period Λ is 0.31 μm, f is 0.55; the material “Metal” is Ag; the medium n 1 and n 2 For PVC (1.54); medium n 5 , n 6 and n 7 for SiO 2 (1.46); medium n' 2 , n' 3 , n' 4 and n' 5 for Zr 2 o 5 (2.0); the incident light wavelength is 0.38-0.8 μm, and the incident angle θ is 0°.

[0040] Figure 5 It is the spectrum and chromaticity diagram of s and p polarized light and unpolarized light of the subwavelength grating true color element. see Figure 5 , the spectrum of s-polarized light has a significant peak near 0.508 μm (efficiency is close to 93%), and the corresponding color position on the CIE x-y chromaticity diagram is (0.24, 0.54), that is, light green (RGB value is 0, 255 and 45); although the spectrum of p-polarized light has peaks near 0.46 μm and 0.56 μm, the efficiency is low (not higher than 45%) and the effic...

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Abstract

The invention provides a sub-wavelength grating true color element and a color generating product containing the same. The sub-wavelength grating true color element is composed of seven structural layers, orderly including a media layer, a media grating layer, the media layer, a media-metal grating layer, the media grating layer, the media-metal grating layer and the media layer from bottom to top, wherein the media layers are uniform thin layers composed of transparent media, and the media grating layer and the media-metal grating layer are respectively sub-wavelength grating layers composed of combination of transparent media and transparent media and combination of transparent media and metal material arranged at intervals. Just by the change of the cycle of the sub-wavelength grating true color element and the change of depth parameters of a few of structural layers, the sub-wavelength grating true color element can present various colorful appearances under s and p polarized white light and non-polarized white light and has a special light and color changing effect, and the sub-wavelength grating true color element can be used in the fields, such as colored decoration, optical anti-counterfeiting and structure color imaging.

Description

technical field [0001] The invention relates to a sub-wavelength grating true-color element and a color-presenting product containing the element, which can be applied to the fields of color decoration, optical anti-counterfeiting, structural color imaging and the like. Background technique [0002] Color is usually caused by the absorption of specific wavelength bands of incident light by pigments or dyes, but it can also be produced by the diffraction, interference and scattering of incident light by ordered and disordered microstructures such as gratings and multilayer films. The colors are often called structural colors. Compared with traditional pigment coloration, structural color has more types, higher saturation, and more stable color. In addition, it can also show unique color change characteristics such as light color change, polarization color change, etc., which makes it used in color decoration, High-end optical anti-counterfeiting and color imaging have good a...

Claims

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Application Information

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IPC IPC(8): G02B5/18
Inventor 陈永利刘文霞陈蕴智蔡圣燕赵小梅
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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