CN113094927B - Method for realizing multi-channel information coding by using novel optical film - Google Patents
Method for realizing multi-channel information coding by using novel optical film Download PDFInfo
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- G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
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Abstract
The invention discloses a method for realizing multi-channel information coding by using a novel optical film, which comprises the following steps: 1) Constructing a nanostructure unit; 2) Optimizing the structural parameters of the nanostructure elements according to the wavelength lambda of incident light; 3) Constructing a nanostructure array comprising a plurality of nanostructure elements; set to the polarization direction alpha 1 Linearly polarized light of which the value is not less than pi/2 is incident to the nano structure array and then passes through the alpha direction of the light transmission axis 2 A polarization analyzer of =0 capable of encoding a first image on the nanostructure array; linearly polarized light with the polarization direction unchanged is incident to the nanostructure array and then is transmitted to alpha from the light transmission axis direction 2 A polarization analyzer of = pi/4, capable of encoding a second image on the surface of the nanostructure array; off-normal direction alpha 1 Linearly polarized light of which the frequency is not less than-pi/8 is incident to the nanostructure array and then passes through the direction alpha of a light transmission axis 2 The analyzer with the color value of = pi/8 can encode a third image on the surface of the nanostructure array, and can be applied to the fields of polarization display, encryption, high-end anti-counterfeiting and the like.
Description
Technical Field
The invention belongs to the technical field of micro-nano optics and polarization optics, and particularly relates to a method for realizing multi-channel information coding by using a novel optical film.
Background
The super-surface material is a novel nano material which is composed of a sub-wavelength structure array and has super-strong regulation and control capability on light waves. The appearance of the method provides a new method for realizing miniaturization, integration and high performance of photoelectric devices. With the continuous development of information technology, how to realize the storage and encoding of large-capacity information is a problem of wide attention in the current optoelectronic field.
In order to increase the information capacity of the device and improve the functionality of the device, a plurality of multichannel information coding methods based on the super surface material are proposed one after another, and are divided according to the type of the nano structure, and can be divided into three types in general: 1) A multi-channel information coding method based on a variable-angle nanostructure; 2) A multichannel information coding method based on variable-size nanostructures; 3) A multi-channel information coding method based on a variable rotation angle and variable size nano structure.
At present, the coding method based on the variable-size nanostructure or the variable-size and corner nanostructure has higher processing requirement, but the coding method based on the variable-corner nanostructure mostly trades the quality of an image for the number of coded channels, and the information capacity is not improved substantially. A three-channel information coding method is provided based on a variable-angle nanostructure.
Disclosure of Invention
In view of the problems in the prior art, the invention aims to provide a method for realizing multi-channel information coding by using a novel optical film, which can realize the conversion between three-channel information by skillfully designing the steering angle of a nano structure in the novel optical film and has good development prospects in the fields of high-end anti-counterfeiting, polarization display, image hiding and the like.
The invention provides a method for realizing multi-channel information coding by using a novel optical film, which comprises the following steps:
1) Constructing a nanostructure unit; the nano-structure unit comprises a transparent substrate and a nano-brick deposited on the working surface of the substrate, a xoy coordinate system is established by taking the right-angle side of the structure unit 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 the included angle between the long axis of the nano-brick and the x axis is the steering angle theta of the nano-brick;
2) Optimizing structural parameters of the nanostructure elements as a function of incident light wavelength λ, the structural parameters comprising: the side length C of the working surface of the substrate, and the long axis L, the short axis W and the height H of the nano brick;
3) Constructing a nanostructure array comprising a plurality of nanostructure elements; set to the polarization direction alpha 1 Linearly polarized light of which the value is phi/2 is incident to the nanostructure array and then passes through the direction alpha of a light transmission axis 2 A polarization analyzer of =0 capable of encoding a first image on the nanostructure array; linearly polarized light with the polarization direction unchanged is incident to the nanostructure array and then is transmitted to alpha from the light transmission axis direction 2 A polarization analyzer of = pi/4, capable of encoding a second image on the surface of the nanostructure array; off-normal direction alpha 1 Linearly polarized light of which the value is not less than pi/8 is incident to the nano structure array and then passes through the alpha direction of the light transmission axis 2 The analyzer which is not less than pi/8 can code a third image on the surface of the nanostructure array, namely, the analyzer can realize the simultaneous coding of the three images on the array formed by the variable-angle nanostructures.
Further, the transparent substrate in the step 1) is fused silica glass material, and the nano brick is gold, silver, aluminum or silicon material.
Further, the structural parameters of the nanostructure units in the step 2) are obtained by electromagnetic simulation optimization according to the selected wavelength λ of the incident light.
Further, each nanostructure unit in the nanostructure array in step 3) is equivalent to a polarizer, and when the linearly polarized light passes through the nanoblock polarizer and then passes through the analyzer, the emergent light intensity can be expressed as:
in the formula: i is 0 Theta is the intensity of the incident polarized light, theta is the steering angle of the nanoblock, alpha 1 Is the polarization direction of incident linearly polarized light, alpha 2 Is the direction of the transmission axis of the analyzer;
a. the polarization direction of incident linearly polarized light is perpendicular to the transmission axis of the analyzer (alpha) 2 ＝α 1 + pi/2), the emergent light intensity can be simplified as:
the continuous adjustment of the emergent intensity can be realized by adjusting the steering angle theta of the nano brick; when the polarization direction of the incident light is alpha 1= pi/2 and alpha 2=0, the emergent light intensity is
b. Polarization direction alpha of incident linearly polarized light 1 = π/2, direction α of transmission axis of analyzer 2 When the light intensity is not less than pi/4, the emergent light intensity can be simplified to
c. Polarization direction alpha of incident linearly polarized light 1 = π/8, direction α of transmission axis of analyzer 2 When the light intensity is not less than pi/8, the emergent light intensity can be simplified to
Further, the intensity variation relationship of the three emergent light intensity modulation functions in the steering angle theta value range [0, pi ] of the nano brick is as follows:
a. the steering angle theta of the nano brick is [0, pi/8 ]]When the range is changed, the corresponding intensity I 1 Can realize continuous modulation of 0-0.5, I 2 Has an intensity of less than 0.5 3 Has an intensity of greater than 0.5;
b. the steering angle theta of the nano brick is [3 pi/8, pi/2]When the range is changed, the corresponding intensity I 1 Can also realize continuous modulation of 0-0.5, I 2 Has an intensity of more than 0.5 3 Is less than 0.5;
c. the steering angle theta of the nano brick is [ pi/2,5 pi/8]When the intensity is varied within the range, the corresponding intensity can still achieve 0-0.5Continuous modulation, I 2 Has an intensity of more than 0.5 3 Has an intensity of greater than 0.5;
d. the steering angle theta of the nano brick is 7 pi/8, pi]When the intensity of the light source is changed within the range, the corresponding intensity can still realize continuous modulation of 0-0.5, I 2 Has an intensity of less than 0.5 3 Is less than 0.5;
by reasonably arranging the steering angles of the nano bricks, the three images can be coded on one super surface simultaneously.
Furthermore, the novel film is a nano brick with different rotation angles and the same size, wherein the nano brick is a micro-nano polarizer and can reflect or transmit linear polarization light incident along the long axis of the nano brick and simultaneously transmit or reflect linear polarization light incident along the short axis of the nano brick.
Further, the first image is a continuous gray image, and the second image and the third image are both binary images.
Compared with the prior art, the invention has the beneficial effects that:
1) By adopting the technical scheme of the invention, three images formed by the variable-angle nanostructure array in different polarization states can be respectively designed, wherein the images of the channel 1 and the channel 2 have no correlation, cannot be mutually inferred and can be designed at will, the image of the channel 3 is not associated with the image of the channel 1 and is associated with the image of the channel 2, but the three channels can be converted by rotating the polarizer and the analyzer, so that the variable-angle nanostructure array can be applied to the fields of polarization display, encryption, high-end anti-counterfeiting and the like, and a new method and a new approach are provided for future security technologies;
2) The design method of the invention provides a new degree of freedom of light wave control, the design method is ingenious, the processing difficulty is low, the used structure is simple, and the coding of three nano printing images can be realized only by one nano brick structure unit, so the super surface designed by the invention has small volume, light weight and high integration, and is suitable for the development of miniaturization in the future;
3) The first channel image produced by the invention is a continuous gray image, the second channel and the third channel are binary images, the pattern can be generated at will, the decoding conditions are different, and the pattern is not easy to imitate and forge, so that a user can be applied to high-end watches, luxury goods, chips and other devices needing anti-counterfeiting;
4) The novel optical film of the present invention can operate in both a transmissive mode and a reflective mode.
Drawings
FIG. 1 is a schematic diagram of the nano-brick structural unit in this example;
FIG. 2 is a graph of the transmission/reflection ratio scan of the nanostructure element in this example;
FIG. 3 is a schematic diagram of the relationship between the intensity modulation function and the turning angle of the nano-brick in the present embodiment;
FIG. 4 is a continuous gray scale nanoimprint image of the first pass designed in this example;
fig. 5 is a binary image of the second channel designed in the present embodiment;
fig. 6 is a binary image of the third channel designed in the present embodiment.
Detailed Description
The invention is further illustrated by the following examples, without restricting its scope to these.
Example 1
A method for realizing multi-channel information coding by using a novel optical film comprises the following specific steps:
firstly, constructing a nano-structure unit, as shown in fig. 1, wherein the nano-structure unit is composed of a silver nano brick and a silicon substrate layer, secondly, selecting a design wavelength of λ =633nm, and performing optimization simulation on the nano-structure unit through electromagnetic simulation software CST aiming at the wavelength, so as to obtain the optimized silicon nano brick with the size parameters as follows: the length is L =130nm, the width is W =85nm, the height is H =70nm, and the side length of the unit structure substrate is C =400nm.
The transmission and reflection efficiency of the nano-brick to the linearly polarized light incident along the major axis and the minor axis of the nano-brick under the structural parameters is shown in figure 2, wherein R l 、R s Respectively, the reflection light efficiency along the long axis and the short axis of the nano-brick, wherein T l 、T s Respectively represent followsThe transmission light efficiency of the long axis and the short axis of the meter brick.
As can be seen from FIG. 2, R is at 633nm of the operating wavelength l Up to 80%, R s Is suppressed to below 1% T s Above 90% of T l The light incident along the long axis of the nano-brick is totally reflected, and the light incident along the short axis of the nano-brick is almost totally transmitted, so that the optimized nano-brick unit structure can realize the functions of polarization splitting, namely a transmission polarizer and a reflection polarizer.
And finally constructing a nano-structure array, wherein the nano-structure array comprises a plurality of nano-structure units, when linearly polarized light incident light passes through the nano-structure array and then passes through a polarization analyzer, different light intensity modulation functions can be obtained by changing the light transmission axis directions of a polarizer and the polarization analyzer, a transformation relation graph of the light intensity modulation functions and the azimuth angle of the nano-brick is shown in figure 3, and when the azimuth angle of the nano-brick is [0, pi/8 ]]When the range is varied (region # 1), the corresponding intensity I 1 Can realize continuous modulation of 0-0.5, I 2 Intensity of less than 0.5, I 3 Has an intensity of greater than 0.5; when the azimuth angle of the nano brick is [3 pi/8, pi/2]When the range is varied (region # 2), the corresponding intensity I 1 Can also realize continuous modulation of 0-0.5, I 2 Greater than 0.5, I 3 Is less than 0.5. When the azimuth angle of the nano-brick is [ pi/2,5 pi/8%]When the range is changed (region # 3), the corresponding intensity can still realize continuous modulation of 0-0.5, I 2 Greater than 0.5, I 3 Is greater than 0.5. The azimuth angle of the nano brick is 7 pi/8, pi]When the range is changed (area # 4), the corresponding intensity can still realize continuous modulation of 0-0.5, I 2 Less than 0.5, I 3 Is less than 0.5. Therefore, based on this principle, three images, such as a continuous gray scale image shown in fig. 4, and two binary images shown in fig. 5 and 6, can be designed and generated on one structure surface at the same time.
Claims (3)
1. A method for realizing multi-channel information coding by using a novel optical film is characterized by comprising the following steps:
1) Constructing a nanostructure unit; the nano-structure unit comprises a transparent substrate and a nano-brick deposited on the working surface of the substrate, a xoy coordinate system is established by taking the right-angle side of the structure unit 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 the included angle between the long axis of the nano-brick and the x axis is the steering angle theta of the nano-brick; 1) The transparent substrate in the step is a fused quartz glass material, and the nano brick is a gold, silver, aluminum or silicon material;
2) Optimizing structural parameters of the nanostructure elements as a function of incident light wavelength λ, the structural parameters comprising: the side length C of the working surface of the substrate, and the long axis L, the short axis W and the height H of the nano brick;
3) Constructing a nanostructure array comprising a plurality of nanostructure elements; set to the polarization direction alpha 1 Linearly polarized light of which the value is not less than pi/2 is incident to the nano structure array and then passes through the alpha direction of the light transmission axis 2 A polarization analyzer capable of encoding a first image on the nanostructure array, = 0; linearly polarized light with the polarization direction unchanged is incident to the nanostructure array and then is transmitted to alpha from the light transmission axis direction 2 A polarization analyzer of = pi/4, capable of encoding a second image on the surface of the nanostructure array; polarization direction alpha 1 Linearly polarized light of which the value is not less than pi/8 is incident to the nano structure array and then passes through the alpha direction of the light transmission axis 2 The analyzer which is not less than pi/8 can encode a third image on the surface of the nanostructure array, namely, the analyzer can encode the three images simultaneously on an array formed by the variable-angle nanostructures;
3) In the step, each nanostructure unit in the nanostructure array is equivalent to a polarizer, and when linearly polarized light passes through a nano brick polarizer and then passes through an analyzer, the emergent light intensity can be expressed as:
in the formula: i is 0 Theta is the intensity of the incident polarized light, theta is the steering angle of the nano-brick, alpha 1 Is the polarization direction of incident linearly polarized light, alpha 2 Being transmission of polarization analyzerAn axial direction;
a. the polarization direction of incident linearly polarized light is perpendicular to the transmission axis of the analyzer by alpha 2 ＝α 1 + π/2, the emergent intensity can be simplified as:
wherein, the continuous adjustment of the emergent intensity can be realized by adjusting the steering angle theta of the nano brick; polarization direction alpha of incident light 1 ＝π/2、α 2 When the intensity is not less than 0, the emergent light intensity is
b. Polarization direction alpha of incident linearly polarized light 1 = π/2, direction α of transmission axis of analyzer 2 When the light intensity is not less than pi/4, the emergent light intensity can be simplified to
c. Polarization direction alpha of incident linearly polarized light 1 = -pi/8, light transmission axis direction alpha of analyzer 2 When the light intensity is not less than pi/8, the emergent light intensity can be simplified to be
The intensity variation relation of the three emergent light intensity modulation functions in the steering angle theta value range [0, pi ] of the nano brick is as follows:
a. the steering angle theta of the nano brick is [0, pi/8 ]]When the range is changed, the corresponding intensity I 1 Can realize continuous modulation of 0-0.5, I 2 Has an intensity of less than 0.5 3 Has an intensity of greater than 0.5;
b. the steering angle theta of the nano brick is [3 pi/8, pi/2]When the range is changed, the corresponding intensity I 1 Also can realize continuous modulation of 0-0.5, I 2 Has an intensity of more than 0.5 3 Is less than 0.5;
c. the steering angle theta of the nano brick is [ pi/2,5 pi/8]When the range is changed, the corresponding intensity I 1 Can still realize continuous modulation of 0-0.5, I 2 Has an intensity of more than 0.5 3 Has an intensity of greater than 0.5;
d. the steering angle theta of the nano brick is 7 pi/8, pi]When the range is changed, the corresponding intensity I 1 Can still realize continuous modulation of 0-0.5, I 2 Has an intensity of less than 0.5 3 Is less than 0.5;
by reasonably arranging the steering angles of the nano bricks, the three images can be simultaneously coded on one super surface;
the novel optical film is a nano brick with different corners and the same size, wherein the nano brick is a micro-nano polarizer and can reflect or transmit linearly polarized light incident along the long axis of the nano brick and simultaneously transmit or reflect linearly polarized light incident along the short axis of the nano brick.
2. The method of claim 1, wherein the structural parameters of the nanostructure elements in step 2) are optimized by electromagnetic simulation according to the selected wavelength λ of the incident light.
3. The method of claim 1, wherein the first image is a continuous gray scale image, and the second image and the third image are binary images.
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