CN110879429B - Super surface capable of realizing double-primary-color display and application thereof - Google Patents
Super surface capable of realizing double-primary-color display and application thereof Download PDFInfo
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- 239000011449 brick Substances 0.000 claims abstract description 80
- 239000003086 colorant Substances 0.000 claims abstract description 22
- 239000000758 substrate Substances 0.000 claims abstract description 21
- 230000010287 polarization Effects 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000000926 separation method Methods 0.000 claims abstract description 9
- 238000005457 optimization Methods 0.000 claims abstract description 7
- 229910052709 silver Inorganic materials 0.000 claims description 9
- 239000004332 silver Substances 0.000 claims description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 6
- 238000004088 simulation Methods 0.000 claims description 4
- 230000004044 response Effects 0.000 claims description 3
- 235000012239 silicon dioxide Nutrition 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 2
- 229910052737 gold Inorganic materials 0.000 claims description 2
- 239000010931 gold Substances 0.000 claims description 2
- 238000005286 illumination Methods 0.000 claims description 2
- ORUIBWPALBXDOA-UHFFFAOYSA-L magnesium fluoride Chemical compound [F-].[F-].[Mg+2] ORUIBWPALBXDOA-UHFFFAOYSA-L 0.000 claims description 2
- 229910001635 magnesium fluoride Inorganic materials 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 2
- 229910052721 tungsten Inorganic materials 0.000 claims description 2
- 230000003595 spectral effect Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 5
- 241000220225 Malus Species 0.000 abstract description 3
- 239000007795 chemical reaction product Substances 0.000 abstract 1
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- 238000010586 diagram Methods 0.000 description 4
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- 230000005540 biological transmission Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000002086 nanomaterial Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000005350 fused silica glass Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 239000012237 artificial material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
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- 238000001259 photo etching Methods 0.000 description 1
- 150000003378 silver Chemical class 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/002—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of materials engineered to provide properties not available in nature, e.g. metamaterials
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Abstract
The invention discloses a super surface capable of realizing double-primary-color display and application thereof. The super surface is formed by a plurality of structural units which are periodically arrayed on a plane, and each structural unit is composed of a substrate and a nano brick arranged on the substrate; the polarization separation and the light intensity modulation of incident light are realized through the optimization of the parameters of the structural unit, and then the red and green primary colors are displayed; and forming a super surface with a color display function based on the combination and arrangement of the two-primary-color structural units. The length, width and height of the nano-brick are optimized to form red and green primary colors, the light intensity is modulated by changing the rotation angle of the nano-brick, and the ultrahigh-resolution double-primary-color nano-printing can be realized based on the Malus law. The super-surface-based dual-primary-color image display technology has a simple design method, can realize continuous gray scale modulation, has the advantages of small volume, light weight, easy integration, capability of generating multiple colors and the like compared with the traditional anti-counterfeiting technology, and can be widely applied to the fields of anti-counterfeiting of high-end products and the like.
Description
Technical Field
The invention belongs to the fields of micro-nano optics and polarized optics, and particularly relates to a super surface capable of realizing double-primary-color display and application thereof in high-resolution nano printing.
Background
The phenomena of reflection, transmission, refraction, diffraction and the like generated based on the difference of the micro-nano structure can cause a plurality of different colors, and the color generation mechanism is called as structural color. The super surface is an artificial material with a two-dimensional micro-nano structure, at present, color nano printing based on the super surface becomes a research hotspot in the field of micro-nano optics, however, most of the work is based on the principle of structural color, and scientific researchers are required to design a large number of micro-nano structures so as to realize rich colors. Therefore, a simple and flexible color-generating nano-printing technique with high resolution is urgently required.
Disclosure of Invention
In order to solve the technical problems, the invention provides a super surface capable of realizing double-primary color display and application thereof in high-resolution nano printing.
The technical scheme provided by the invention is as follows:
a super-surface capable of realizing dual-primary color display is formed by a plurality of structural units which are periodically arrayed on a plane,
the structural unit consists of a substrate and nano bricks arranged on the substrate;
the polarization separation and the light intensity modulation of incident light are realized through the optimization of the parameters of the structural unit, and then the red and green primary colors are displayed; and forming the colored super surface based on the combination and arrangement of the two primary color structural units.
Specifically, the substrate is a cuboid with a square cross section; the nano brick is a cuboid.
Specifically, the parameters comprise the side length CS of the cross section of the substrate, the length L, the width W, the height H and the rotation angle phi of the nano brick; and the CS, the L, the W and the H are all sub-wavelength levels.
Specifically, the variation range of the rotation angle phi is 0-90 degrees.
Specifically, the rotation direction angle is an xoy rectangular coordinate system established by taking a right-angle side of the cross section of the substrate as an x axis and a y axis, the long side of the nano brick is a long axis, the short side of the nano brick is a short axis, and an included angle between the long axis of the nano brick and the x axis is formed.
Specifically, the length, the width and the height of the nano brick are optimized to optimize the electromagnetic response in the length direction and the width direction, so that the polarization separation of incident light rays is realized.
Specifically, the light intensity of reflected light or projected light is modulated by optimizing the rotation angle of the nano-brick.
Specifically, the red, orange, yellow and green displays are realized by arranging and combining two primary colors.
Specifically, the nano brick material comprises dielectric silicon, titanium oxide, silver, gold, copper and aluminum, preferably silver;
the substrate is a transparent medium, and the material of the substrate comprises silicon dioxide and magnesium fluoride, and preferably silicon dioxide.
Another object of the present invention is to provide the application of the super-surface capable of realizing two-primary color display in high-resolution color nano-printing.
The principle of the invention is as follows:
1. the parameters of the structural unit are optimized to realize double-primary-color display and gray information storage:
(1) two nano-brick structures with different size parameters are designed, and the electromagnetic response in the long and short axis directions is optimized, so that the polarization separation of reflected light or transmitted light is realized under the condition that polarized light in the long/short axis directions is incident; meanwhile, when the light source is white light, the reflected light or the transmitted light is in different colors, namely, the double-primary-color display of red and green is realized;
(2) the precise and continuous light intensity modulation can be carried out through the change of the rotation angle phi of the nano brick, and the principle can be expressed as follows:
wherein I is the light intensity of the reflected light or the transmitted light at different rotation angles phi, I0The light intensity of reflected light or transmitted light when phi is 0 DEG, and the incident light is linearly polarized light polarized along the long axis or the short axis of the nano brick. Formula (1) shows that when the rotation angle phi of the nano brick is changed, the linear polarization polarized along the long axis or the short axis of the nano brick is incident, the light intensity of the reflected light or the transmitted light is modulated,and the modulation is precise and continuous.
The optimization method is an electromagnetic simulation method, two structural parameters CS, L, W and H of the nano brick unit are optimized according to red light and green light, the optimized structural parameters meet the requirements of working in a reflection mode at two design wavelengths, the optimized structural parameters are represented as red light or green light under the illumination of a white light source, the linearly polarized light polarized along the long axis and the short axis of the nano brick is subjected to polarization separation in an output mode, and the two structures have the same structural parameters CS and H.
2. Realizing double-primary color nano printing with ultrahigh resolution:
the nano brick has two primary colors of red and green, so the arrangement scheme of the nano brick has great flexibility when realizing nano printing. Through arranging and combining two primary color elements, the two nano bricks can be mixed to form any one color of red, orange, yellow and green tones according to requirements, and have gray information which can be changed randomly:
wherein, IR、IGCorresponding to gray values of red and green primary colors, IR,0、IG,0Respectively corresponding to the gray value phi of the reflected light or transmitted light of the red and green primary color nano bricks when the rotation angle is 0 DEGR、φGThe rotation angles of the red and green primary color nano bricks are respectively. The color and gray information of the pattern can be converted into the size of the turning angle corresponding to the nano bricks through a formula (2), and the nano bricks are closely arranged according to the distribution rule of the designed pattern, so that the nano brick array with the image information can be obtained; the specific linear polarized light is vertically incident to the super surface, so that the function of the double-primary-color nano printing can be realized, and the specific color generation scheme is shown in the embodiment.
The invention has the beneficial effects that:
(1) the invention designs two structural units with different size parameters, and realizes the red and green double-primary colors with gray information by changing the rotation angles;
(2) the invention can realize the bicolor nano printing with ultrahigh resolution, and the minimum period of a single pixel is only the size of one structural unit, and is in the sub-wavelength level;
(3) compared with the traditional anti-counterfeiting technology such as holography, the image display technology provided by the invention not only has abundant gray information, but also can realize multiple colors, has more abundant functions, and can be widely applied to the fields of optical information anti-counterfeiting and the like.
Drawings
FIG. 1 is a schematic three-dimensional structure of a nano-brick unit in an embodiment;
fig. 2 and 3 are the transmittance and reflectance distributions of two kinds of nano-brick structures respectively designed for green light and red light after optimization when the super-surface is designed by using silver nano-bricks in the embodiment;
FIG. 4 is a schematic diagram of the layout of the nano-bricks designed for red and green colors in the example;
FIG. 5 is a schematic diagram of a single pixel structure designed for yellow hue in the embodiment, where RGB is normalized;
FIG. 6 is a schematic diagram of a single pixel structure designed for orange tone in the example, where RGB is normalized;
FIG. 7 is a schematic diagram of a simulation of a super-surface based two-primary-color nano-printing process in an embodiment of the present invention.
In the figure: 1, nano brick; a substrate-2; l is the long axis size of the nano brick; w is the minor axis size of the nano brick; h is the height of the nano brick; CS is the size of the cycle of the nano brick; phi is the rotation angle of the nano brick.
Detailed Description
The invention will be described in further detail below with reference to the figures and specific examples, to which the invention is not at all restricted.
Examples
The embodiment provides a super-surface capable of realizing dual-primary color display. The super surface is formed by a plurality of structural units which are periodically arrayed on a plane, and each structural unit is composed of a substrate and nano bricks etched on the substrate.
In the embodiment, a fused quartz material is used as a substrate, a metal silver material is used for etching a nano brick structure, a single nano brick structure unit is shown in figure 1, and a super surface material is composed of a nano brick 1 and a substrate 2, wherein the cross section of the substrate of the structure unit is square, and the side length CS of the cross section is also the period of the super surface; the length L, the width W and the height H of the structure of the nano brick are all sub-wavelength sizes, the right-angle sides of the structure units are used as an x axis and a y axis, the height is used as a z axis, an xyz rectangular coordinate system is established, the long side of the nano brick is a long axis, the short side of the nano brick is a short axis, and an included angle phi between the long axis of the nano brick and the x axis is a rotation direction angle of the nano brick.
The silver nano-brick array structure works in a reflection mode, when a white light source passes through a polarizer along the x-axis direction and then is normally incident on the nano-brick array, reflected light respectively shows different colors according to different sizes of nano-bricks. According to Malus' law, the nanoblock structure has precise and continuous intensity modulation effect on reflected light, and can realize a polarization separation device with red and green light response through design.
The following will provide a specific implementation using the silver nanoblock array structure for two-primary color nanoimprinting:
in this embodiment, the substrate is fused silica, the excitation light source is white light, and a polarizer along the x-axis direction is used to ensure that the incident light is normal-incidence x-axis polarized light.
The method comprises the steps of firstly, modeling and simulating by adopting electromagnetic simulation software, optimizing the structure of a silver nano brick unit within a wave band of 480 nm-650 nm, reflecting polarized light along a long axis polarized light in a design wave band and transmitting the polarized light along a short axis in a visible light wave band, respectively expressing the reflection spectrums of the polarized light along the long axis as red light and green light as optimization objects, and optimizing the geometric structure parameters of the metal nano brick structure. The optimized geometric structural parameters of the metal nano brick are as follows: green light L =85nm, W =60nm, H =90nm, CS =350 nm; red light L =140nm, W =60nm, H =90nm, CS =350 nm. Fig. 2 and 3 are corresponding transmission-reflection spectrum distributions, respectively, where Rx and Tx are x-axis polarized light incidence and reflection and transmission at phi of 0 °; ry and Ty are respectively the reflection rate and the transmission rate when y axis polarized light is incident and phi is 0 deg.
Secondly, the structure of two silver nano brick units can be determined through the first step, the color and the gray scale of the designed pattern can be converted into corresponding nano brick arrangement according to the Malus law, and the following design schemes of several nano brick arrangements are introduced:
a) if the designed pattern only considers two colors of red and green, the design scheme of the nano brick is shown in figure 4, one nano brick corresponds to one color and gray level, the pixel size is equal to the size of a single nano brick, the gray level of the pattern is represented by the arrangement of the turning angles of the nano brick, and the two colors of red and green respectively correspond to the nano bricks with two sizes;
b) if yellow and orange tones need to be designed, the nano-brick arrangement scheme shown in fig. 5 and 6 is used, a 2 × 2 nano-brick unit is taken as a color pixel, two kinds of nano-bricks are respectively distributed diagonally, and each nano-brick has the same turning angle. In this design, different colors can be achieved by controlling the distribution of the rotation angles of different nano-bricks, the arrangement of fig. 5 can achieve yellow (R =1, G =1, B = 0), and the arrangement of fig. 6 can achieve orange (R =0.98, G =0.52, B = 0).
Thirdly, the pixel structures formed by the nano bricks are closely arranged according to the designed pattern, and a nano brick array can be obtained.
And fourthly, preparing the nano brick array by adopting a photoetching process according to the nano brick array structure determined in the third step, so that the storage of pattern information can be realized.
And fifthly, observing the color nano-printed patterns of the near field by using a microscope in cooperation with a white light source and a polarizer, wherein the imaging simulation process is shown in fig. 6.
The invention is based on the super-surface double-primary-color nano printing technology, has only two primary colors, can realize the nano printing function of patterns with ultrahigh resolution, rich gray information and a large number of colors, and can be applied to the special fields of optical anti-counterfeiting and the like.
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 (10)
1. A super-surface capable of implementing bi-primary display, comprising:
is formed by a plurality of structural units which are periodically arrayed on a plane,
the structural unit consists of a substrate and nano bricks arranged on the substrate;
the spectral modulation, the polarization separation and the light intensity modulation of incident light are realized through the optimization of the parameters of the structural unit, and then the red and green primary colors are displayed; forming a color super surface based on the combination and arrangement of the two primary color structural units;
the parameters of the structural unit comprise the side length CS of the cross section of the substrate, the length L, the width W, the height H and the rotation direction angle phi of the nano brick;
the super-surface optimization method is an electromagnetic simulation method, two structural parameters CS, L, W and H of the nano brick unit are optimized according to red light and green light, the optimized structural parameters meet the requirements of working in a reflection mode at two design wavelengths, the optimized structural parameters are represented as red light or green light under the illumination of a white light source, linear polarization light polarized along the long axis direction and the short axis direction of the nano brick is subjected to polarization separation in an output mode, and the two structures have the same structural parameters CS and H.
2. The super-surface capable of realizing two-primary color display according to claim 1, wherein: the substrate is a cuboid with a square cross section; the nano brick is a cuboid.
3. The super-surface capable of realizing two-primary color display according to claim 2, wherein: and the CS, the L, the W and the H are all sub-wavelength levels.
4. The super-surface capable of realizing two-primary color display according to claim 1, wherein: angle of rotation
The variation range of (A) is 0-90 degrees.
5. The super-surface capable of realizing two-primary color display according to claim 1, wherein: the rotation direction angle is an xoy rectangular coordinate system established by taking a rectangular edge of the cross section of the substrate as an x axis and a y axis, the long edge of the nano brick is a long axis, the short edge of the nano brick is a short axis, and an included angle between the long axis of the nano brick and the x axis is formed.
6. The super-surface capable of realizing two-primary color display according to claim 1, wherein: the electromagnetic response in the length direction and the width direction is optimized by optimizing the length, the width and the height of the nano brick, so that the polarization separation of incident light rays is realized.
7. The super-surface capable of realizing two-primary color display according to claim 1, wherein: the rotation angle of the nano brick is optimized to modulate the light intensity of reflected light or transmitted light.
8. The super-surface capable of realizing two-primary color display according to claim 1, wherein: the red, orange, yellow and green display is realized by the arrangement and combination of the two primary colors.
9. The super-surface capable of realizing two-primary color display according to claim 1, wherein: the nano brick material comprises dielectric silicon, titanium oxide, silver, gold, copper and aluminum; the substrate is a transparent medium and is made of silicon dioxide and magnesium fluoride.
10. The use of the metasurface capable of displaying two primary colors according to any one of claims 1 to 9 in high resolution color nano printing and color nano anti-counterfeiting.
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| CN110376672A (en) * | 2019-06-27 | 2019-10-25 | 武汉大学 | A kind of super surface array structure and its application in image display multiplexing |
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| CN105807598A (en) * | 2016-05-27 | 2016-07-27 | 武汉大学 | Silicon nano brick array structure for Fourier color holography and design method thereof |
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