CN111158074A - Double-channel color-coded anti-counterfeiting image display super surface and design method thereof - Google Patents
Double-channel color-coded anti-counterfeiting image display super surface and design method thereof Download PDFInfo
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- CN111158074A CN111158074A CN202010014612.1A CN202010014612A CN111158074A CN 111158074 A CN111158074 A CN 111158074A CN 202010014612 A CN202010014612 A CN 202010014612A CN 111158074 A CN111158074 A CN 111158074A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000011449 brick Substances 0.000 claims abstract description 59
- 230000010287 polarization Effects 0.000 claims abstract description 10
- 239000003086 colorant Substances 0.000 claims abstract description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 16
- 229910052709 silver Inorganic materials 0.000 claims description 16
- 239000004332 silver Substances 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 7
- 241000220225 Malus Species 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 5
- 238000005457 optimization Methods 0.000 claims description 4
- 238000001259 photo etching Methods 0.000 claims description 4
- 230000009977 dual effect Effects 0.000 claims 1
- 230000003287 optical effect Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 5
- 238000004088 simulation Methods 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000002102 nanobead Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0012—Optical design, e.g. procedures, algorithms, optimisation routines
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
- G09F3/02—Forms or constructions
- G09F3/0291—Labels or tickets undergoing a change under particular conditions, e.g. heat, radiation, passage of time
- G09F3/0294—Labels or tickets undergoing a change under particular conditions, e.g. heat, radiation, passage of time where the change is not permanent, e.g. labels only readable under a special light, temperature indicating labels and the like
Abstract
The invention provides a double-channel color coded anti-counterfeiting image display super surface and a design method thereof. The nano-brick unit structure is equivalent to a polarizer for incident red and green line polarized light, and can effectively adjust the proportion of red and green components in the incident line polarized light so as to form a colorful pattern (the color is in the range between red and green) in a near field; by changing the polarization angle of the linearly polarized light, another binarized red-green pattern (two colors) can be formed in the near field. And the two patterns are not related and independent. The invention can be applied to high-resolution image display, optical anti-counterfeiting and information multiplexing, has small volume, low cost, light weight and simple design idea, and is very suitable for being applied to a micro photoelectric system.
Description
Technical Field
The invention belongs to the field of micro-nano optics and polarization optics, and particularly relates to a double-channel color-coded anti-counterfeiting image display super surface and a design method thereof.
Background
Image display is one direction of great importance in the field of optics. The super surface is used for realizing the display of the near field image, and the resolution of the image can be greatly improved. The resolution of color nanoprinting is generally lower than grayscale, as multiple nanostructures are required to individually control intensity for red, green, and blue wavelengths.
Based on the anti-counterfeiting image display super surface with the double-channel color coding and the design method thereof, the nano brick can simultaneously act on red light and green light by using only one structure, so that high-resolution color nano printing (74000dpi) is realized; and the first channel and the second channel have two independent and completely unrelated color patterns and can record different information respectively, so that the anti-counterfeiting function is realized to a certain extent.
Disclosure of Invention
Aiming at the defects of the traditional image display, the invention provides the anti-counterfeiting image display super-surface with the double-channel color coding and the design method thereof by combining the polarization theory and designing the silver nano brick array.
One of the objectives of the present invention is to provide a dual-channel color-coded anti-counterfeit image display super-surface material, which combines the periodicity of sine and cosine functions and the Malus law I ═ I0cos2Theta, the near-field double-channel color nano printing is realized by optimizing the rotation angle and firstly passing through the nano brick unit structure array with single geometric dimension, and the two images are independent and do not interfere with each other. The invention has good application potential in the aspects of high-resolution color image display, information multiplexing and optical anti-counterfeiting;
the invention also aims to provide a design method of the anti-counterfeiting image display super-surface of the double-channel color coding, which can generate the characteristic of the same light intensity by combining different corners of the Malus law and optimize the corners, thereby skillfully realizing the near-field double-channel color nano printing;
in order to achieve the purpose, the scheme of the invention is as follows:
in a first aspect, the present invention provides a dual-channel color-coded anti-counterfeit image display super-surface, which is characterized in that:
the super-surface material is formed into a nano brick unit array by nano bricks capable of simultaneously responding to red light and green light, the interval between different nano brick unit structures is a period CS, and nano brick units at different positions correspond to different corners;
the nano brick unit structure acts as a polarizer for linearly polarized light; when incident red and green line polarized light is polarized along the long axis of the nano brick, the red light is reflected, and the green light is transmitted; when incident red and green line polarized light is polarized along the minor axis of the nano brick, green light is reflected, and red light is transmitted;
when incident red and green light passes through a polarizer polarized along the x axis and then passes through the super surface (a channel), a colorful nano printing pattern with the color continuously changing between red and green is formed on the surface of the super surface material; when incident red and green light passes through a polarizer with an included angle of 45 degrees between a light transmission axis and an x axis and then passes through the super surface (two channels), another binary red and green color nano printing pattern is formed on the surface of the super surface material.
As a preferred scheme, the near-field color printing image of the channel I realizes continuous color adjustment between red light and green light;
the color of the near-field color printing image of the channel II is binarized;
using Malus law I ═ I0cos2The periodicity of the theta and sine and cosine functions can make the color nano printing pattern of one channel completely independent from the binarization color nano printing pattern of two channels by optimizing the rotation angle.
In a second aspect, the invention provides a method for designing a dual-channel color-coded anti-counterfeiting image display super surface, which is characterized by comprising the following steps: comprises the following steps:
(1) according to the two selected incident light wavelengths, when the incident ray polarization light vertically irradiates the nano brick unit through electromagnetic simulation software, the red light polarized along the long axis has high reflection efficiency and the green light has high transmission efficiency; the red light polarized along the short axis has high transmission efficiency, the green light reflection efficiency is high as a target, and the cycle CS of the nano brick unit structure, the width W, the length L and the height H of the nano brick unit structure are optimized;
(2) when incident ray polarized light is polarized along the x axis, defining the corner of the nano brick (the included angle between the long axis of the nano brick and the x axis), and when the incident ray polarized light irradiates the super surface, the light intensity formula of the reflected green light is IG1＝IG0sin2Theta, the light intensity formula of reflected red light is IR1＝IR0cos2Theta, so as to form a color pattern between the red light and the green light on the channel I; according to the light intensity formula of the reflected red light and the green light, when the rotation angle is changed from theta to-theta, the intensity of the red light and the intensity of the green light of the channel I cannot be changed, so that for a selected channel pattern, each pixel point can have two candidate rotation angles theta or-theta; at this time, the rotating polarizer is rotated by 45 degrees, and the red light intensities corresponding to theta and-theta are respectively
And
the two intensities are obviously different, and correspond to a high intensity and a low intensity according to the difference of theta; similarly, the green light intensity corresponds to a low intensity and a high intensity, and a preferred selection can be made between the rotation angle theta or-theta according to the color of each pixel point of the two-channel target image;
(3) based on the principle, when the nano brick array consisting of n nano brick unit structures is designed, on the premise of ensuring that the near-field color nano printing pattern is not changed, the total number of the nano brick array is 2nAccording to the corner combination, according to a far-field monochromatic target image, carrying out alternative optimization on each nano corner to obtain a final corner combination, and thus determining the structure of the nano brick array;
(4) preparing a double-channel color-coded anti-counterfeiting image display super surface by adopting a photoetching process according to the silver nano brick array structure determined in the step (3);
(5) displaying the super-surface according to the obtained double-channel color coded anti-counterfeiting image, and observing a color nano printing pattern with continuously changing colors between red and green on the surface of the sample after incident light passes through a polarizer polarized along an x axis; rotating the polarizer by 45 degrees, and observing the binaryzation color nano printing pattern on the surface of the sample wafer.
And when incident double-color light is incident on the sample through the polarizer, the corresponding color nano printing pattern is observed on the surface of the super-surface material through a microscope.
The invention has the advantages and beneficial effects that:
(1) the provided anti-counterfeiting image display super-surface with the double-channel color coding skillfully utilizes the Malus law, two completely different color nano-printing patterns are coded in a near field, the two patterns can be switched by rotating a polarizer, and the two patterns are completely independent and are not related to each other;
(2) compared with the traditional image display, the pattern resolution provided by the invention is greatly improved, a decoding process is required, and certain confidentiality is achieved;
(3) compared with the traditional image display device, the near-far field multiplexing super surface has the advantages of small volume, low cost, small weight and capability of realizing dynamic modulation;
(4) the structure has an ultramicro structure and can be widely applied to the field of photonic integration;
(5) the metal nano brick array structure can be processed by a standard photoetching process, and the process is simple;
(6) the near-field double-channel color pattern provides a new idea for anti-counterfeiting and encryption design and preparation of image display, and has great reference value and application prospect.
Drawings
FIG. 1 is a schematic diagram of a structural unit of a near-far field multiplexing super-surface in example 1, wherein a corner (defined as an included angle between a long axis of a nano-brick and an x-axis;
FIG. 2 is a schematic diagram of a three-dimensional structure of a part of the silver nanobead array structure in example 1;
FIG. 3 is a graph showing simulation results of the silver nanobead array on incident light in example 1, wherein the x-axis is wavelength and the y-axis is reflection efficiency, including long-axis reflection efficiency and short-axis reflection efficiency;
FIG. 4 is a schematic diagram of an optical path for decoding near-field color nanoimprinting in example 1;
FIG. 5 is a schematic diagram of a near-field color map, wherein a, a channel image, b, a two channel image;
in the figure: 1. nano bricks; 2. a substrate; l, the long axis size of the nano brick; w, the minor axis size of the nano brick; H. the height of the nano brick and the distance between the CS and the nano brick.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
The invention provides a double-channel color-coded anti-counterfeiting image display super surface and a design method thereof.
In the first step, fig. 1-2 show a silver nano brick array structure, which comprises two layers of silver nano bricks 1 and a substrate 2 from top to bottom in sequence. The silver nano brick array 1 is formed by periodically arranging silver nano brick unit structures, the silver nano bricks are cuboids, and the length, the width and the height of the silver nano bricks are sub-wavelength sizes. The structure of a single silver nanoblock unit is shown in fig. 1, and a substrate 2 is a silicon dioxide substrate.
As an embodiment, 510nm and 620nm are selected as working wavelengths, and the structure of the silver nano brick unit is optimized under the working wavelengths by adopting the existing CST STUDIO SUITE electromagnetic simulation tool, so that the red light reflection efficiency is highest when incident linear polarization light is polarized along the long axis of the nano brick; when incident linear polarization light is polarized along the minor axis of the nano brick, the green light reflection efficiency is highest; by rotating the nano brick array structure, the change of reflected light from red light to green light can be realized. In this embodiment, the optimized silver nanoblock has a length L of 140nm, a width W of 85nm, a thickness H of 70nm, and a unit structure CS of 340 nm; the polarization efficiency graph obtained by simulation is shown in fig. 3, the reflection efficiency of the red light polarized along the major axis reaches 90%, and the reflection efficiency of the green light polarized along the minor axis reaches 70%;
secondly, the structure of a single silver nano brick unit can be determined through the first step, a color image (a channel pattern) with n pixels and a color range between red and green is selected, and the efficiency and the Malus law I-I obtained through simulation in the first step0cos2Determining the rotation angle theta or-theta of each pixel point nano brick by theta to obtain 2nSeed arrangement combination;
selecting a pattern with only red and green colors as a two-channel color pattern, and carrying out alternative optimization on the nanometer corner of each pixel point obtained in the second step according to the red and green of the pixel points of the pattern so as to determine the structure of the nanometer brick array;
and fourthly, preparing the anti-counterfeiting image display super surface with the double-channel color coding by adopting a photoetching process according to the silver nano brick array structure determined in the third step.
Fifthly, according to the obtained super surface, after incident light passes through a polarizer polarized along the x axis, a color nano printing pattern of a channel is observed on the surface of the sample wafer, as shown in fig. 5 a; after the incident light passes through the polarizer with an angle of 45 degrees with the x-axis, a binary color pattern of the two channels is observed on the surface of the sample wafer, as shown in fig. 5 b. The optical path diagram is shown in fig. 4.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any modification, equivalent replacement, and improvement made by those skilled in the art within the technical scope of the present invention should be included in the scope of the present invention.
Claims (3)
1. A double-channel color coded anti-counterfeiting image display super surface is characterized in that:
the super-surface material is formed into a nano brick unit array by nano bricks capable of simultaneously responding to red light and green light, the interval between different nano brick unit structures is a period CS, and nano brick units at different positions correspond to different corners;
the nano brick unit structure acts as a polarizer for linearly polarized light; when incident red and green line polarized light is polarized along the long axis of the nano brick, the red light is reflected, and the green light is transmitted; when incident red and green line polarized light is polarized along the minor axis of the nano brick, green light is reflected, and red light is transmitted;
when incident red and green light passes through a polarizer polarized along the x axis and then passes through the super surface, a color nano printing pattern is formed on the surface of the super surface material, namely a channel I; rotating the polarizer for 45 degrees, and observing another color binaryzation color pattern on the surface of the metamaterial, namely a channel II; the two images are independent and independent of each other.
2. The dual channel color-coded security image displaying super-surface of claim 1, wherein:
the near-field color printing image of the channel I realizes continuous color adjustment between red light and green light;
the near-field color printing image of the channel II realizes a binary color image;
using Malus law I ═ I0cos2Theta one intensity corresponds to the characteristic of two different corners, and optimization is performed on each corner, so that two images of the first channel and the second channel are independent and completely unrelated to each other.
3. A method for designing a dual-channel color-coded anti-counterfeiting image display super surface according to claim 1 or 2, wherein the method comprises the following steps: comprises the following steps:
(1) according to the two selected incident light wavelengths, when the incident ray polarization light vertically irradiates the nano brick unit through electromagnetic simulation software, the red light polarized along the long axis has high reflection efficiency and the green light has high transmission efficiency; the red light polarized along the short axis has high transmission efficiency, the green light reflection efficiency is high as a target, and the cycle CS of the nano brick unit structure, the width W, the length L and the height H of the nano brick unit structure are optimized;
(2) when the incident ray polarization light is polarized along the x-axis, the corner of the nano-brick is defined (the included angle between the long axis of the nano-brick and the x-axis when the incident ray polarization light enters the nano-brick)The light intensity formula of the reflected green light is I after the ray polarized light irradiates the super surfaceG1＝IG0sin2Theta, the light intensity formula of reflected red light is IR1＝IR0cos2Theta, so as to form a color pattern between the red light and the green light on the channel I; according to the light intensity formula of the reflected red light and the green light, when the rotation angle is changed from theta to-theta, the intensity of the red light and the intensity of the green light of the channel I cannot be changed, so that for a selected channel pattern, each pixel point can have two candidate rotation angles theta or-theta; at this time, the rotating polarizer is rotated by 45 degrees, and the red light intensities corresponding to theta and-theta are respectively
And
the two intensities are obviously different, and correspond to a high intensity and a low intensity according to the difference of theta; similarly, the green light intensity corresponds to a low intensity and a high intensity, and a preferred selection can be made between the rotation angle theta or-theta according to the color of each pixel point of the two-channel target image;
(3) when designing a nano brick array consisting of n nano brick unit structures, on the premise of ensuring that a near-field color nano printing pattern of one channel is not changed, the design is total 2nPerforming alternate optimization on each nanometer corner according to a two-channel binarization color target image to obtain a final corner combination, thereby determining the structure of the nanometer brick array;
(4) preparing a double-channel color-coded anti-counterfeiting image display super surface by adopting a photoetching process according to the silver nano brick array structure determined in the step (3);
(5) displaying the super-surface according to the obtained double-channel color coded anti-counterfeiting image, wherein after incident light passes through the polarizer, the polarizer is polarized along the x axis to form a channel, and color nano printing patterns with continuously changed colors are observed on the surface of the sample wafer; when the included angle between the polarizer and the x axis is 45 degrees, two channels are formed, and color binaryzation color nano printing patterns are observed on the surface of the sample wafer.
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Cited By (2)
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| CN112733343A (en) * | 2020-12-30 | 2021-04-30 | 武汉大学 | Design method of super-surface color nano printing device capable of realizing reconfigurable watermark |
| CN115150521A (en) * | 2022-06-10 | 2022-10-04 | 武汉大学 | Displacement encryption system based on three-channel super surface and design method thereof |
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| CN115150521A (en) * | 2022-06-10 | 2022-10-04 | 武汉大学 | Displacement encryption system based on three-channel super surface and design method thereof |
| CN115150521B (en) * | 2022-06-10 | 2023-08-25 | 武汉大学 | Three-channel super-surface-based shift encryption system and design method thereof |
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