CN112733343A - Design method of super-surface color nano printing device capable of realizing reconfigurable watermark - Google Patents
Design method of super-surface color nano printing device capable of realizing reconfigurable watermark Download PDFInfo
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Abstract
The invention provides a design method of a super-surface color nano printing device for realizing reconfigurable watermarks, which comprises the following steps: constructing a super-surface array; optimizing simulation to obtain reflection spectra of the nano-brick structural units with multiple groups of size parameters, and calculating to obtain structural colors of the nano-brick structural units; designing a target color image, and selecting several groups of size parameters with structural colors meeting requirements as alternative size parameters according to the color distribution of the target color image; finding the size parameters corresponding to the nano-brick structure units corresponding to the pixel points from the alternative size parameters according to the colors of the pixel points of the target color image; designing a watermark image to be superposed, setting the turning angle of the nano-brick structure unit corresponding to the pixel point without the watermark superposition as alpha and setting the turning angle of the nano-brick structure unit corresponding to the pixel point with the watermark superposition as alpha +/-90 degrees on the basis of the steps. The invention has high tolerance of processing errors, reduces the design and processing difficulties and has good development prospect.
Description
Technical Field
The invention belongs to the technical field of micro-nano optics, and particularly relates to a design method of a super-surface color nano printing device capable of realizing reconfigurable watermarks.
Background
The current structural color nano-printing scheme based on polarization multiplexing generally adjusts and controls the spectral response of polarized light in two orthogonal directions by designing the long and short axis sizes of nano-unit structures. However, in such schemes, when the long axis or short axis of the nano-unit is changed independently, the transflective spectra of polarized light in two directions are affected, and the spectral response of polarized light in a certain direction cannot be independently regulated, which makes the design and processing of the existing polarization multiplexing structure color nano-printing scheme difficult.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a design method of a super-surface color nano printing device for realizing reconfigurable watermarks.
In order to solve the technical problems, the invention adopts the following technical scheme:
a design method for realizing a super-surface color nano printing device with a reconfigurable watermark comprises the following steps:
s1: constructing a super-surface array, wherein the super-surface array comprises a plurality of nano brick structure units which are periodically arranged, and each nano brick structure unit comprises a substrate working surface and a nano brick arranged on the substrate working surface;
s2: optimizing and simulating to obtain reflection spectrums of the nano brick structure units with multiple groups of size parameters, and calculating to obtain corresponding structural colors according to the reflection spectrums;
s3: designing a target color image, and selecting several sets of size parameters with structure colors meeting requirements from the multiple sets of size parameters of the nano brick structure units in the step S2 according to the color distribution of the target color image as alternative size parameters;
s4: finding the size parameters corresponding to the nano-brick structural units corresponding to the pixel points from the alternative size parameters of the step S3 according to the colors of the pixel points of the target color image;
s5: designing a watermark image to be superposed on the target color image, setting the nano-brick steering angle of the nano-brick structure unit corresponding to the pixel point without watermark superposition as alpha on the basis of the step S4, and setting the nano-brick steering angle of the nano-brick structure unit corresponding to the pixel point with watermark superposition as alpha +/-90 degrees, thereby obtaining the required super-surface color nano printing device.
Further, an xoy coordinate system is established by respectively setting the directions of two edges parallel to the working surface as an x axis and a y axis, a long axis L and a short axis W are arranged on the surface of the nano brick parallel to the working surface, and the steering angle of the nano brick is the included angle between the long axis L of the nano brick and the x axis.
Further, the size parameters of the nano-brick structure unit include a long axis L, a short axis W, and a height H of the nano-brick and the size of the side length P of the working surface of the substrate, and the long axis L is not equal to the short axis W.
Further, when simulation optimization is performed in the step 2, the height H of the nano-brick structure unit and the size of the side length P of the working surface of the substrate are fixed, white light under the working wavelength is incident on the nano-brick structure unit, and electromagnetic simulation software is adopted to scan the sizes of the long axis L and the short axis W of the nano-brick.
Further, the structural color calculation method of the nano brick structural unit in step S2 is as follows:
adopting a white light source to enter a nano brick structure unit, and setting the relative spectral power distribution of an illumination light source as S (lambda) and the spectral reflectance of the nano brick as rho (lambda), the color stimulation function is as follows:
CIE 1931 Standard chromaticity observer Spectrum tristimulus values of
The normalization factor is defined to adjust the Y value of the illumination source to 100:
from this, the color tristimulus values of the structural colors produced by the nano-brick structural units can be calculated:
the tristimulus values are converted into the CIE 1931RGB system and expressed as:
the R, G, B value of the structural color corresponding to the nano-brick structural unit of each size parameter can be calculated.
Furthermore, the working light source of the super-surface color nano printing device is white light, and the working wavelength is 400nm-750 nm.
Furthermore, the working surface of the substrate is square, and the side length of the working surface of the substrate is equal to the distance between the central points of the adjacent nano bricks.
The invention also aims to provide a super-surface color nano printing device obtained by the design method for realizing the super-surface color nano printing device with the reconfigurable watermark.
Further, when a non-polarized white light is incident to the super-surface color nano printing device, a target color image without the superposed watermark is reflected and displayed; when white light polarized along the long axis direction of the nano brick in the non-watermark area is incident to the super-surface color nano printing device, the target color image superposed with the watermark is reflected and displayed.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention adopts the multiplexing of unpolarized light and linearly polarized light, compared with the scheme of adopting the multiplexing of two orthogonal linear polarization states, the design and processing difficulty is low, the operation is easy, the nano brick structure unit in the invention can be realized only by anisotropy, namely the long axis and the short axis of the nano brick are not equal, the processing error tolerance is high, the imaging light path is simple, and the incident light path only needs a common white light source and a polarizer;
(2) the invention adopts the polarization state of incident light as a secret key, and can record original and target color nano-printing images superposed with watermarks on a super surface at the same time, and the dual-mode nano-printing imaging technology has high information security and provides a flexible dynamic regulation and control scheme;
(3) the super-surface color nano printing device has compact structure, can provide high information density storage, has small volume and light weight, and has great industrialization prospect in the aspects of anti-counterfeiting, encryption, information multiplexing and the like.
Drawings
FIG. 1 is a schematic structural diagram of a nano-brick structural unit according to an embodiment of the present invention;
FIG. 2 shows the reflection spectra of 8 dimensional parameter nano-bricks in the embodiment of the present invention under the incidence of polarized light along the x-direction and polarized light along the y-direction;
FIG. 3 is a schematic diagram of the arrangement of the nano-brick structural units with different dimensional parameters and nano-brick turning angles according to the embodiment of the present invention;
FIG. 4 is a schematic three-dimensional structure of a super-surface array portion according to an embodiment of the present invention;
fig. 5 is a schematic diagram of imaging effects of incident light in two polarization states according to an embodiment of the present invention, in which (a) a target color image without a watermark is superimposed, and (b) a target color image with a watermark is superimposed.
In the figure, 1, a nano brick; 2. a substrate working surface; 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 is high; p, the side length of the working surface of the substrate.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention.
The invention provides a design method of a super-surface color nano printing device for realizing reconfigurable watermarks, which comprises the following steps:
s1: constructing a super-surface array, wherein the super-surface array comprises a plurality of nano brick structure units which are periodically arranged, and each nano brick structure unit comprises a substrate working surface and a nano brick arranged on a substrate working surface; in the step, a xoy coordinate system is respectively established by taking the directions of two edges parallel to the working surface of the substrate as an x axis and a y axis, the height direction of the nano brick is set as a z axis, the surface parallel to the working surface on the nano brick is provided with a long axis L and a short axis W, and the steering angle alpha of the nano brick is the included angle between the long axis L and the x axis of the nano brick;
s2: optimizing and simulating to obtain reflection spectrums of the nano brick structure units with multiple groups of size parameters, and calculating to obtain corresponding structural colors according to the reflection spectrums;
in this embodiment, white light is selected as the incident light source, and the operating wavelength is 400nm-750 nm. Fig. 1 shows a structure of a nano brick structure unit, which shows a substrate working surface 2 with a side length P and a nano brick 1 arranged on the substrate working surface, wherein the long axis of the nano brick is L, the short axis of the nano brick is W, and the height of the nano brick is H, wherein the projection of the centers of the nano brick 1 and the substrate working surface 2 on an XOY plane is coincident, the substrate working surface is square, and the side length of the substrate working surface is equal to the distance between the centers of the adjacent nano bricks. The nano brick 1 can be made of materials such as silicon, titanium dioxide, silicon nitride and the like, and the substrate working surface 2 can be made of materials such as fused quartz, alumina and the like.
In this embodiment, in order to ensure that the short axis reflection spectrum difference is as small as possible and simplify the calculation, the height H and the working face side length P of the nano brick are fixed, and the short axis W of the nano brick is also fixed, so as to perform the simulation scanning on the nano brick structure unit. Of course, in other embodiments, the minor axis W, the height H, and the working face side length P of the nanoblock may not be fixed, depending on the design and display requirements. In this embodiment, the minor axis W and the height H of the nano-brick and the side length P of the working surface are selected to be fixed, and the nano-brick structure unit has anisotropy, so that the major axis L and the minor axis W of the nano-brick are not equal. Specifically, the height H of the nano brick is 230nm, the length W of the short axis is 40nm, and the side length P of the working face is 400 nm. CST STUDIO SUITE electromagnetic simulation software is adopted to scan various long axis L sizes of the nano brick under the working wavelength, the periodic boundary condition is used, the scanning range is 90nm-300nm, and the step length is 10 nm. Simulating to obtain a reflection spectrum under the incidence of white light polarized along the L direction of the long axis of the nano brick and polarized along the W direction of the short axis of the nano brick, and calculating to obtain a corresponding structural color according to the reflection spectrum, wherein the specific method comprises the following steps:
in this embodiment, an LED white light source is used for incidence, and if the relative spectral power distribution of the illumination light source is S (λ) and the spectral reflectance of the nano brick is ρ (λ), the color stimulus function is:
CIE 1931 Standard chromaticity observer Spectrum tristimulus values of
The normalized coefficient is defined as the ratio ofThe Y value of the bright light source is adjusted to 100:
from this, the color tristimulus values of the structural colors produced by the nano-bricks can be calculated:
the tristimulus values are converted into the CIE 1931RGB system and expressed as:
the R, G, B values of the structural colors corresponding to the nano-brick structural units with various long axis L sizes can be calculated.
S3: designing a target color image, and selecting several sets of size parameters with structure colors meeting requirements from the multiple sets of size parameters of the nano brick structure units in the step S2 according to the color distribution of the target color image as alternative size parameters;
to achieve a color nanoprinted image, the difference in reflectance spectra of different nanopatterns in the long axis direction should be as large as possible. A target color image is designed in advance, several sets of long axis L size parameters meeting requirements are selected as alternative sizes from the reflection spectra obtained by simulating the sizes of the multiple long axes L of the nano brick structure units in the step S2 and the structural colors obtained by calculation according to the color distribution of the target color image, and in the embodiment, 8 sets of nano brick structure units with different long axis L sizes are selected and respectively correspond to 8 structural colors. Fig. 2 is a long-short axis direction reflectivity curve corresponding to 8 groups of selected nano-bricks, and the size parameters and the reflective structure color R, G, B values of the corresponding nano-brick structural units are as follows:
table 18 set of nano brick size and structure color
All the width W of the nano-bricks are equal, so that the resonance peak positions generated by the incident light polarized along the minor axis W direction of the nano-bricks are basically consistent, and the structural color is basically the same. And because the long axes L of the nano bricks are different, the resonance peak positions generated by the incident light polarized along the direction of the long axes L of the nano bricks are different, and 8 different structural colors can be presented. When unpolarized light is incident, the spectral response can be regarded as the superposition of the spectral response of polarization along the L direction of the long axis of the nano brick and the polarization along the W direction of the short axis of the nano brick, the structural color similar to that of the incident polarized light along the L direction of the long axis of the nano brick is presented, and only the saturation degree is reduced.
S4: finding the size parameters corresponding to the nano-brick structural units corresponding to the pixel points from the alternative size parameters of the step S3 according to the colors of the pixel points of the target color image;
s5: designing a watermark image to be superimposed on the target color image, setting a nano-brick steering angle of a nano-brick structural unit corresponding to a pixel point without watermark superimposition as alpha on the basis of the step S4, setting a nano-brick steering angle of a nano-brick structural unit corresponding to a pixel point with watermark superimposition as alpha +/-90 degrees, and referring to FIG. 3; in this embodiment, the turning angles of the nano-bricks of the nano-brick structural units corresponding to the pixel points without the added watermarks are all set to 0 °, at this time, the long and short axes of the nano-bricks in the nano-brick structural units corresponding to the pixel points without the added watermarks are arranged in parallel with the coordinate axis of the working surface, that is, the long axis of the nano-bricks is parallel to the x-axis direction, the short axis of the nano-bricks is parallel to the y-axis direction, and the turning angles of the nano-bricks of the nano-brick structural units corresponding to the pixel points with the added watermarks are all set to 90 °, although in other embodiments, other angles may be selected, but the difference between the angles is 90 °. The dimensional parameters of the nano-brick structural units in the super-surface array are selected and arranged according to the step S4, and the nano-brick turning angles are set according to the method of the step S5, so as to obtain the required super-surface color nano-printing device, and the structural schematic diagram of the designed partial super-surface color nano-printing device is shown in fig. 4.
In this embodiment, the super-surface color nano-printing device is illuminated by a white LED light source, and the incident light can be regarded as the superposition of x-direction linear polarization and y-direction linear polarization with equal intensity, so that 8 kinds of nano-bricks present different colors, and the super-surface color nano-printing device reflects an 8-color nano-printing image corresponding to the distribution of the 8 kinds of nano-bricks. As shown in fig. 5 (a).
In this embodiment, a polarizer with a polarization direction of x-axis is added to the incident light path, so that the incident light becomes white light polarized along x-direction. For the nano brick with the nano brick steering angle of 0 degree, the structural color along the long axis direction is presented; and for the nano brick with the nano brick steering angle of 90 degrees, the structural color along the minor axis direction is presented. Therefore, in the area where the turning angle of the nano-brick is 0 °, the original 8-color target color image is still presented, and in the area where the turning angle of the nano-brick is 90 °, the super-surface color nano-printing device is illuminated by linearly polarized white light, and the 8-color target color image with the superimposed watermark can be obtained, as shown in fig. 5 (b). Therefore, the invention can realize the regulation and control of the polarization state of the incident light by adding or removing the polarizer in the incident light path, and the reflected image can be flexibly switched between the states of no watermark superposition and watermark superposition, thereby realizing the color nano printing imaging of the reconfigurable watermark.
In this embodiment, the principle that the nano-brick structure units with different size parameters generate different structural colors under the incidence of white light with different polarization states is as follows: the incident light generates Mie resonance in the dielectric nano unit to cause backscattering, so that the reflectivity is increased, and the wavelength response characteristic is realized, thereby realizing spectrum regulation. For the anisotropic nano brick, the positions of resonance peaks along the long axis and the short axis are changed along with the sizes of the long axis and the short axis, so that different spectral responses can be realized in two orthogonal polarization directions by adjusting the sizes of the long axis and the short axis of the nano brick, and different structural colors are generated. The unpolarized light can be regarded as the superposition of x-direction linearly polarized light and y-direction linearly polarized light with equal intensity, so that the incident reflection spectrum of the unpolarized light is the superposition of the x-direction linearly polarized light and the y-direction linearly polarized light reflection spectrum.
When the size of the nano-brick is designed, the long-axis resonance is controlled, and the short-axis resonance is inhibited, so that under the illumination of a white light LED, the structural colors presented by the incidence of y polarized light are basically the same, and the incidence of x polarized light presents 8 different structural colors. When unpolarized light is incident, the spectral response can be regarded as the superposition of the spectral responses of x-polarization and y-polarization, and the structure color similar to that of the incident x-polarization light is presented, but the saturation is reduced.
In the super-surface color nano-printing device of the present embodiment, each nano-tile corresponds to one imaging pixel. The distribution positions of the 8 kinds of nano bricks are set according to the color distribution of the target color image, so that a color nano printing image is reflected when unpolarized light is incident. Of course, in other embodiments, not limited to the 8 sizes of the present embodiment, a variety of nano-brick sizes may be selected as needed to achieve the desired target image display.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (9)
1. A design method for realizing a super-surface color nano printing device with a reconfigurable watermark is characterized by comprising the following steps:
s1: constructing a super-surface array, wherein the super-surface array comprises a plurality of nano brick structure units which are periodically arranged, and each nano brick structure unit comprises a substrate working surface and a nano brick arranged on the substrate working surface;
s2: optimizing and simulating to obtain reflection spectrums of the nano brick structure units with multiple groups of size parameters, and calculating to obtain corresponding structural colors according to the reflection spectrums;
s3: designing a target color image, and selecting several sets of size parameters with structure colors meeting requirements from the multiple sets of size parameters of the nano brick structure units in the step S2 according to the color distribution of the target color image as alternative size parameters;
s4: finding the size parameters corresponding to the nano-brick structural units corresponding to the pixel points from the alternative size parameters of the step S3 according to the colors of the pixel points of the target color image;
s5: designing a watermark image to be superposed on the target color image, setting the nano-brick steering angle of the nano-brick structure unit corresponding to the pixel point without watermark superposition as alpha on the basis of the step S4, and setting the nano-brick steering angle of the nano-brick structure unit corresponding to the pixel point with watermark superposition as alpha +/-90 degrees, thereby obtaining the required super-surface color nano printing device.
2. The method as claimed in claim 1, wherein a xoy coordinate system is established by setting x-axis and y-axis in directions parallel to two edges of the working surface, respectively, the nano-brick has a major axis L and a minor axis W on a surface parallel to the working surface, and the nano-brick turning angle is an included angle between the major axis L of the nano-brick and the x-axis.
3. The method as claimed in claim 1, wherein the dimensional parameters of the nano-brick structure unit include a major axis L, a minor axis W and a height H of the nano-brick and a dimension of a side length P of the working surface of the substrate, and the major axis L is not equal to the minor axis W.
4. The method for designing a super-surface color nano-printing device for realizing reconfigurable watermarks according to claim 3, wherein in the step 2 of simulation optimization, the height H of the nano-brick structure unit and the size of the side length P of the working surface of the substrate are fixed, white light with working wavelength is incident on the nano-brick structure unit, and electromagnetic simulation software is adopted to scan the sizes of the long axis L and the short axis W of the nano-brick.
5. The method for designing a super-surface color nano printing device for realizing reconfigurable watermarks according to claim 1, wherein the method for calculating the structural color of the nano-brick structural units in step S2 comprises the following steps:
adopting a white light source to enter a nano brick structure unit, and setting the relative spectral power distribution of an illumination light source as S (lambda) and the spectral reflectance of the nano brick as rho (lambda), the color stimulation function is as follows:
CIE 1931 Standard chromaticity observer Spectrum tristimulus values of
The normalization factor is defined to adjust the Y value of the illumination source to 100:
from this, the color tristimulus values of the structural colors produced by the nano-brick structural units can be calculated:
the tristimulus values are converted into the CIE 1931RGB system and expressed as:
the R, G, B value of the structural color corresponding to the nano-brick structural unit of each size parameter can be calculated.
6. The method for designing the super-surface color nano-printing device for realizing the reconfigurable watermark according to claim 1, wherein a working light source of the super-surface color nano-printing device is white light, and a working wavelength is 400nm to 750 nm.
7. The design method of the super-surface color nano printing device for realizing the reconfigurable watermark, according to claim 1, characterized in that the working surface of the substrate is square, and the side length of the working surface of the substrate is equal to the distance between the center points of the adjacent nano bricks.
8. A super-surface color nano-printing device obtained by the design method for realizing the super-surface color nano-printing device with the reconfigurable watermark according to any one of claims 1 to 7.
9. The super-surface color nano printing device obtained by the design method for realizing the super-surface color nano printing device with the reconfigurable watermark according to claim 8, wherein when non-polarized white light is incident to the super-surface color nano printing device, a target color image without the superimposed watermark is reflected and displayed; when white light polarized along the long axis direction of the nano brick in the non-watermark area is incident to the super-surface color nano printing device, the target color image superposed with the watermark is reflected and displayed.
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