CN110335533A - A kind of optical information hiding method based on super surface array structure - Google Patents
A kind of optical information hiding method based on super surface array structure Download PDFInfo
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Abstract
The invention belongs to micronano optical technical fields, disclose a kind of optical information hiding method based on super surface array structure, comprise determining that operation wavelength, optimize the dimensional parameters of nano brick cellular construction, when making the polarised light normal incidence of random polarization state under operation wavelength to nano brick cellular construction, the linearly polarized light component reflectivity vibrated along the long axis direction of nano brick cellular construction is maximum, and the linearly polarized light component transmitance along short-axis direction vibration is maximum；The grayscale information of M × N number of pixel composition gray level image is encoded to M × N number of nano brick cellular construction direction angle information, generates first direction angular moment battle array；Change the deflection for the n nano brick cellular construction selected at random, generates second direction angular moment battle array；By M × N number of size, consistent, deflection constitutes super surface array structure according to the nano brick cellular construction arranged at equal intervals of second direction angle matrix arrangement.The present invention can be realized hiding for optical information by super surface array structure.
Description
Technical field
The present invention relates to micronano optical technical field more particularly to a kind of optical information based on super surface array structure are hidden
Hiding method.
Background technique
Informationization is the main trend of current era development, and information is not only closely bound up with people's lives, also has become state
The important strategic resource of family, therefore information security issue is concerned.Information encryption, hiding and anti-counterfeiting technology are that information security is ground
The hot spot studied carefully promotes the fast development of Information Hiding Techniques.
Information Hiding Techniques based on optical Information Processing mainly use the polarization of position phase, wavelength, spatial frequency and light
The multidimensional codings such as state realize Information hiding, and Meta Materials material can be in amplitude of the sub-wavelength dimensions to light wave electromagnetic field, position phase
Flexibly and effectively regulated and controled with polarization state etc., and its advantage such as small with size, light-weight, easy to process, it is extensive
Applied to optical every field.
Summary of the invention
The purpose of the present invention is to provide a kind of optical information hiding methods based on super surface array structure, utilize horse Lyu
This law realizes hiding for optical information.
The embodiment of the present application provides a kind of optical information hiding method based on super surface array structure, including following step
It is rapid:
Step 1 determines operation wavelength, optimizes the dimensional parameters of nano brick cellular construction by electromagnetic simulation software, so that
Under operation wavelength when the polarised light normal incidence of random polarization state to nano brick cellular construction, along the long axis side of nano brick cellular construction
Linearly polarized light component reflectivity to vibration is maximum, while along the linearly polarized light point of the short-axis direction of nano brick cellular construction vibration
It is maximum to measure transmitance；
The grayscale information of M × N number of pixel composition gray level image is encoded to M × N number of nano brick cellular construction by step 2
Direction angle information, generate first direction angular moment battle array；
The deflection for the n nano brick cellular construction that step 3, change are selected at random, generates second direction angular moment battle array；
Step 4, by M × N number of size, consistent, deflection exists according to the nano brick cellular construction of second direction angle matrix arrangement
Arranged at equal intervals on length and width direction constitute the super surface array structure for being able to achieve optical information hiding.
Preferably, in the step 1, the dimensional parameters of the nano brick cellular construction include length L, the width of nano brick
W, height H, cellular construction substrate side length C.
Preferably, in the step 2, the gray level image has 256 grades of tonal gradations.
Preferably, in the step 2, the gray value of all pixels constitutes a gray matrix in gray level image, according to Iout
=Iin cos2The grayscale information of the gray level image is encoded to the direction angle information of nano brick cellular construction by (Φ-θ)；Wherein,
Iin=255, each of gray matrix gray value is as Iout, θ is between the direction of vibration and x-axis of incident ray polarized light
Angle, Φ are the deflection of nano brick cellular construction.
Preferably, in the step 3, change the deflection for the n nano brick cellular construction selected at random, meet Φ1+Φ2
=2+k × 180 ° θ (k=0,1)；Wherein, Φ1For first direction angle, Φ2For second direction angle.
Preferably, work as Iout/Iin>cos2When θ, k=0；Work as Iout/Iin<cos2When θ, k=1；Work as Iout/Iin=cos2When θ,
K=0 or 1.
Preferably, in the step 4, nano brick of the super surface array structure by substrate and etching over the substrate
Array is constituted, and the nano brick array is made of M × N number of nano brick cellular construction.
Preferably, the substrate selects silica, and the nano brick cellular construction selects silver nanoparticle brick.
Preferably, in the step 1, the operation wavelength selects 633nm.
Preferably, when the operation wavelength selects 633nm, the length of nano brick is 160nm, and width 80nm is highly
70nm, cellular construction substrate side length are 300nm.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
In the embodiment of the present application, optimize polarization sensitive nano brick cellular construction, make each nano brick cellular construction
It is equivalent to a miniature polarizer, in conjunction with Malus' law, a width gray level image is selected, according to the linearly polarized light of a certain polarization state
Nano brick array is designed, the grayscale information of each pixel of image is dexterously changed into nano brick deflection, is realized when former polarization state
Linearly polarized light when being incident on nano brick array, it can be clearly seen that a width original-gray image, if it is inclined to change incident ray
When polarization state (i.e. the angle of the direction of vibration of incident ray polarized light and nano brick deflection changes) of vibration light, script nanometer
The image information that brick array is included is hidden, i.e., the present invention realizes the hidden of optical information by super surface array structure
Hiding.
Detailed description of the invention
It, below will be to needed in embodiment description in order to illustrate more clearly of the technical solution in the present embodiment
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is one embodiment of the present of invention, general for this field
For logical technical staff, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is nanometer in a kind of optical information hiding method based on super surface array structure provided in an embodiment of the present invention
The schematic diagram at block assembly structure direction angle；
Fig. 2 is nanometer in a kind of optical information hiding method based on super surface array structure provided in an embodiment of the present invention
The dimensional parameters schematic diagram of block assembly structure；
Fig. 3 is in a kind of optical information hiding method based on super surface array structure provided in an embodiment of the present invention by M
The consistent only different nano brick cellular construction of the deflection arranged at equal intervals on length and width direction of × N number of size, the nano brick of composition
The schematic diagram of array；
Fig. 4 is designed in a kind of optical information hiding method based on super surface array structure provided in an embodiment of the present invention
The nano brick cellular construction linearly polarized light orthogonal to two polarization states vibrated respectively along long axis and short-axis direction reflection and thoroughly
Penetrate efficiency；
Fig. 5 is chosen in a kind of optical information hiding method based on super surface array structure provided in an embodiment of the present invention
Gray level image；
Fig. 6 is in a kind of optical information hiding method based on super surface array structure provided in an embodiment of the present invention, θ=
0 ° of linearly polarized light is incident on the gray level image generated when nano brick array；
Fig. 7 is in a kind of optical information hiding method based on super surface array structure provided in an embodiment of the present invention, θ=
45 ° of linearly polarized light be incident on generated when nano brick array hide after image.
Wherein, 1- nano brick cellular construction, 2- substrate.
Specific embodiment
In order to better understand the above technical scheme, in conjunction with appended figures and specific embodiments to upper
Technical solution is stated to be described in detail.
A kind of optical information hiding method based on super surface array structure is present embodiments provided, mainly includes following step
It is rapid:
Step 1 determines operation wavelength, optimizes the dimensional parameters of nano brick cellular construction by electromagnetic simulation software, so that
Under operation wavelength when the polarised light normal incidence of random polarization state to nano brick cellular construction, along the long axis side of nano brick cellular construction
Linearly polarized light component reflectivity to vibration is maximum, while along the linearly polarized light point of the short-axis direction of nano brick cellular construction vibration
It is maximum to measure transmitance；
The grayscale information of M × N number of pixel composition gray level image is encoded to M × N number of nano brick cellular construction by step 2
Direction angle information, generate first direction angular moment battle array；
The deflection for the n nano brick cellular construction that step 3, change are selected at random, generates second direction angular moment battle array；
Step 4, by M × N number of size, consistent, deflection exists according to the nano brick cellular construction of second direction angle matrix arrangement
Arranged at equal intervals on length and width direction constitute the super surface array structure for being able to achieve optical information hiding.
It can be clearly when the linearly polarized light of former polarization state is incident on nano brick array using super surface array structure
See a width original-gray image, if change incident ray polarized light polarization state (i.e. the direction of vibration of incident ray polarized light with
The angle of nano brick deflection changes) when, the image information that script nano brick array is included is hidden, i.e. this hair
It is bright that hiding for optical information is realized by super surface array structure.
The present invention is described further below.
1, optimization design can realize the polarization sensitive nano brick cellular construction of polarization spectro.
It is illustrated so that nano brick cellular construction is cuboid as an example below.The length of the nano brick cellular construction
It is sub-wavelength.
As shown in Figure 1, establishing xoy rectangular coordinate system, the longitudinal direction of nano brick cellular construction 1 represents long axis, short side side
Xiang representing short axle, Φ is the angle between the long axis and x-axis of nano brick cellular construction 1, the i.e. deflection of nano brick cellular construction 1
(value range of Φ is 0 °~180 °), as shown in Figure 1.
Since the length shaft size of polarization sensitive nano brick cellular construction 1 has differences, electromagnetism in both directions is rung
It should also will be different.The dimensional parameters for optimizing nano brick cellular construction by electromagnetic simulation software, including nano brick cellular construction 1
Height H, length L, width W and cellular construction substrate side length C (that is, substrate 2 is divided into multiple cellular construction substrates).
As shown in Fig. 2, being obtained when making the polarised light normal incidence of random polarization state under operation wavelength to the nano brick cellular construction 1
The linearly polarized light component reflectivity vibrated along the long axis direction of nano brick cellular construction 1 is maximum, while along nano brick cellular construction 1
Short-axis direction vibration the maximum packet size parameter of linearly polarized light component transmitance, that is, optimize after nano brick cellular construction
1 dimensional parameters.
The function of polarization spectro may be implemented in nano brick cellular construction after optimization design, is equivalent to one and miniature is polarized
Device.Since the linearly polarized light of random polarization state can be broken into the linearly polarized light of two cross-polarizations, work as a branch of linear polarization
When illumination is mapped on nano brick cellular construction, the consistent linearly polarized light of long axis direction point of direction of vibration and nano brick cellular construction
Amount reflects, and the consistent linearly polarized light component of short-axis direction of direction of vibration and nano brick cellular construction is directed through.
Optimize the size for constituting the polarization sensitive nano brick cellular construction of nano brick array by electromagnetic simulation software
Parameter, so that under operation wavelength when polarised light normal incidence to the nano brick array of random polarization state, along nano brick long axis side
It is reflected to the polarized light component of vibration, the polarized light component along the vibration of nano brick short-axis direction is directed through, and is reached and is mutually hung down
The working effect of straight two bunch polarised lights separation, i.e., the described nano brick cellular construction are equivalent to the miniature polarizer.
2, the principle of optical information hiding is realized based on super surface array structure.
Since nano brick cellular construction may be used as the miniature polarizer, also meet Malus' law:
Iout=Iincos2(Φ-θ) (1)
Wherein, IinFor light intensity of incident light, IoutFor reflected light light intensity, θ be incident ray polarized light direction of vibration and x-axis it
Between angle (value range of θ be 0 °~180 °).
By formula (1) it is found that the θ given for one, the i.e. polarization state of incident ray polarized light are determined, change nano brick list
The deflection Φ of meta structure, then the light intensity of reflected light also changes therewith.Due to cos2(Φ-θ) is a cycle idol letter
Number, there are the deflection Φ of two different nano brick cellular constructions1And Φ2If the two meets:
Φ1+Φ2=2+k × 180 ° θ (k=0,1) (2)
Then cos2(Φ1- θ)=cos2(Φ2- θ), work as Iout/Iin>cos2When θ, k=0；Work as Iout/Iin<cos2When θ, k=
1；Work as Iout/Iin=cos2When θ, k=0 or 1.This is indicated when the direction of vibration of incident ray polarized light and x-axis angle are θ, incident
There is different directions angle Φ to two1And Φ2Nano brick on when, reflected light light intensity is identical.
When the direction of vibration of incident ray polarized light changes, it is assumed that direction of vibration and x-axis angle are θ at this time1(θ1≠
θ), then cos2(Φ1-θ1)≠cos2(Φ2-θ1), being incident on two at this time has different directions angle Φ1And Φ2Nano brick on
When, reflected light light intensity is different.
3, the design method of nano brick array arrangement.
(1) it chooses a width and the gray level image with 256 (0~255) grade tonal gradations is formed by M × N number of pixel, it is horizontal
Number of pixels on direction is M, and the number of pixels in vertical direction is N, which only has tonal gradation, without the change of color
Change, the gray value of all pixels constitutes a gray matrix in image.The polarization state of incident ray polarized light is determined, if linearly polarized light
Direction of vibration and the angle of x-axis be θ0, in conjunction with Malus' law, if Iin=255, each of gray matrix gray value is made
For Iout, according to formula (1), find out the inceptive direction angular moment battle array Φ of corresponding nano brick array1(i.e. first direction angular moment battle array).
(2) inceptive direction angular moment battle array Φ is chosen1The deflection of middle n any positionBy these
The deflection of position is changed intoThe two meets the relationship of formula (2), i.e.,If the deflection matrix after changing is Φ2(i.e. second direction angular moment battle array).
(3) super surface array structure is made of the nano brick array on substrate and substrate, and nano brick array is by M × N number of ruler
Very little consistent, only the different polarization sensitive nano brick cellular construction of deflection arranged at equal intervals on length and width direction are constituted, and are respectively received
The deflection of rice block assembly structure is according to second direction angular moment battle array Φ2It arranges, nano brick array schematic diagram is as shown in Figure 3.
Wherein, the substrate is silicon dioxide substrates, and the nano brick cellular construction is silver nanoparticle brick, but not limited to this.
The operating mode of the super surface array structure be it is reflective, but not limited to this.
In conclusion the optical information hiding method based on super surface array structure, mainly comprises the steps that
(1) it determines operation wavelength, optimizes the dimensional parameters of nano brick cellular construction by electromagnetic simulation software, so that work
Under wavelength when the polarised light normal incidence of random polarization state to the nano brick cellular construction, along the long axis side of nano brick cellular construction
Linearly polarized light component reflectivity to vibration is maximum, while along the linearly polarized light point of the short-axis direction of nano brick cellular construction vibration
It is maximum to measure transmitance；
(2) assume that the direction of vibration of incident ray polarized light and the angle of x-axis are θ0, a width is selected to be made of M × N number of pixel
The grayscale information of image is changed into nano brick cellular construction according to formula (1) by the gray level image with 256 grades of tonal gradations
First direction angular moment battle array Φ1；
(3) a part of nano brick cellular construction is selected at random, changes the side of these nano brick cellular constructions according to formula (2)
To angle, second direction angular moment battle array Φ is generated2；
(4) M × N number of size is consistent, deflection is according to second direction angular moment battle array Φ2The polarization sensitive nano brick of arrangement
Cellular construction arranged at equal intervals on length and width direction constitute nano brick array, as shown in Figure 3；
(5) when direction of vibration and x-axis angle are θ0Line polarisation when being incident on nano brick array surface, can clearly see
To original-gray image, when direction of vibration and x-axis angle are not θ0Line polarisation incidence when, the image information for including originally is hidden
It conceals, that is, realizes hiding for optical information.
The present invention will be further explained below with reference to the attached drawings.
A kind of optical information hiding method based on super surface array structure provided in this embodiment is directed to direction of vibration and x
The incident ray polarized light of axis angle theta=0 ° designs nano brick array, it is expected that the function of realizing is when the linearly polarized light of θ=0 ° enters
When being mapped to nano brick array, it can be clearly seen that a width gray level image, but when the linearly polarized light incidence of θ=45 °, originally
Image information is hidden, i.e., realization optical information is hiding.
In the present embodiment, nanocell structures are by silica substrate, and the silver nanoparticle brick etched in substrate is constituted,
Selection design wavelength is that λ=633nm turns cellular construction to nanometer by electromagnetic simulation software CST and optimize for the wavelength
Emulation, the dimensional parameters of the silver nanoparticle brick after being optimized are as follows: a length of L=160nm, width W=80nm, a height of H=70nm, it is single
Meta structure substrate side length is C=300nm.Nano brick cellular construction is to respectively along long axis and short-axis direction vibration under the structural parameters
The orthogonal linearly polarized light of two polarization states reflection and efficiency of transmission as shown in figure 4, wherein Rl、TlIt respectively represents along nano brick list
The reflectivity and transmissivity of the linearly polarized light of the long axis direction vibration of meta structure, Rs、TsIt respectively indicates along nano brick cellular construction
The reflectivity and transmissivity of the linearly polarized light of short-axis direction vibration.As shown in Figure 4, lambda1-wavelength 550nm to 700nm it
Between when, RlAnd TsNumerical value it is relatively high, RsAnd TlNumerical value it is relatively low.Especially at operation wavelength 633nm, RlAnd TsIt is high
In 90%, RsAnd TlLower than 10%, show that the function of polarization spectro may be implemented in nano brick cellular construction after the optimization.
In the present embodiment, the gray level image with 256 grades of tonal gradations that a width includes 1015 × 1019 pixels is chosen,
That is M=1015, N=1019, original-gray image is as shown in figure 5, the gray value of all pixels constitutes a Gray Moment in image
Battle array, for the incident ray polarized light of direction of vibration and x-axis angle theta=0 °, in conjunction with Malus' law, if Iin=255, gray matrix
Each of gray value as Iout, according to formula (1), find out the inceptive direction angular moment battle array Φ of corresponding nano brick array1。
Choose inceptive direction angular moment battle array Φ1The deflection of middle n any positionAccording to formula (2), by these
The deflection of position is changed intoIf the deflection matrix after changing is Φ2。
In the present embodiment, super surface array structure is made of silver nanoparticle brick array in silicon dioxide substrates and substrate, nanometer
Brick array is by 1015 × 1019 having a size of L=160nm, W=80nm, H=70nm, C=300nm, and deflection is according to deflection
Matrix Φ2The polarization sensitive nano brick cellular construction arranged arranged at equal intervals on length and width direction are constituted.
When the linearly polarized light of θ=0 ° is incident on nano brick array, it can be clearly seen that original-gray image, such as Fig. 6
It is shown；When the linearly polarized light incidence of θ=45 °, script image information is hidden, as shown in fig. 7, realizing optics letter
Breath is hidden.
To sum up, the present invention optimize polarization sensitive nano brick cellular construction, make each cellular construction be equivalent to one it is micro-
The type polarizer selects a width gray level image in conjunction with Malus' law, designs nano brick battle array according to the linearly polarized light of a certain polarization state
The grayscale information of each pixel of image is dexterously changed into nano brick deflection by column, is realized when the linearly polarized light of former polarization state enters
When being mapped to nano brick array, it can be clearly seen that a width original-gray image, if changing the polarization state of incident ray polarized light
When (i.e. the angle of the direction of vibration of incident ray polarized light and nano brick deflection changes), script nano brick array is included
Image information be hidden, i.e., the present invention realizes the hiding of optical information by super surfacing.
A kind of optical information hiding method based on super surface array structure provided in an embodiment of the present invention includes at least such as
Lower technical effect:
(1) the optical information hiding method provided is simple, easily operated；
(2) structure of super surfacing (i.e. super surface array structure) it is simple, it is small in size, light-weight, compact-sized, be easy to
It is integrated with other photonic devices.
It should be noted last that the above specific embodiment is only used to illustrate the technical scheme of the present invention and not to limit it,
Although being described the invention in detail referring to example, those skilled in the art should understand that, it can be to the present invention
Technical solution be modified or replaced equivalently, without departing from the spirit and scope of the technical solution of the present invention, should all cover
In the scope of the claims of the present invention.
Claims (10)
1. a kind of optical information hiding method based on super surface array structure, which comprises the following steps:
Step 1 determines operation wavelength, optimizes the dimensional parameters of nano brick cellular construction by electromagnetic simulation software, so that work
Under wavelength when the polarised light normal incidence of random polarization state to nano brick cellular construction, the long axis direction along nano brick cellular construction shakes
Dynamic linearly polarized light component reflectivity is maximum, while saturating along the linearly polarized light component of the short-axis direction of nano brick cellular construction vibration
Cross rate maximum；
The grayscale information of M × N number of pixel composition gray level image is encoded to M × N number of nano brick cellular construction side by step 2
To angle information, first direction angular moment battle array is generated；
The deflection for the n nano brick cellular construction that step 3, change are selected at random, generates second direction angular moment battle array；
Step 4, by M × N number of size consistent, deflection according to second direction angle matrix arrangement nano brick cellular construction length,
Arranged at equal intervals in wide direction constitute the super surface array structure for being able to achieve optical information hiding.
2. the optical information hiding method according to claim 1 based on super surface array structure, which is characterized in that described
In step 1, the dimensional parameters of the nano brick cellular construction include the length L of nano brick, width W, height H, cellular construction base
Bottom side length C.
3. the optical information hiding method according to claim 1 based on super surface array structure, which is characterized in that described
In step 2, the gray level image has 256 grades of tonal gradations.
4. the optical information hiding method according to claim 1 based on super surface array structure, which is characterized in that described
In step 2, the gray value of all pixels constitutes a gray matrix in gray level image, according to Iout=Iin cos2(Φ-θ) is by institute
The grayscale information for stating gray level image is encoded to the direction angle information of nano brick cellular construction；Wherein, Iin=255, in gray matrix
Each gray value as Iout, θ is the angle between the direction of vibration and x-axis of incident ray polarized light, and Φ is nanometer block assembly
The deflection of structure.
5. the optical information hiding method according to claim 4 based on super surface array structure, which is characterized in that described
In step 3, changes the deflection for the n nano brick cellular construction selected at random, meet Φ1+Φ2=2+k × 180 ° θ (k=0,
1)；Wherein, Φ1For first direction angle, Φ2For second direction angle.
6. the optical information hiding method according to claim 5 based on super surface array structure, which is characterized in that when
Iout/Iin>cos2When θ, k=0；Work as Iout/Iin<cos2When θ, k=1；Work as Iout/Iin=cos2When θ, k=0 or 1.
7. the optical information hiding method according to claim 1 based on super surface array structure, which is characterized in that described
In step 4, the super surface array structure is made of the nano brick array of substrate and etching over the substrate, the nano brick
Array is made of M × N number of nano brick cellular construction.
8. the optical information hiding method according to claim 7 based on super surface array structure, which is characterized in that described
Substrate selects silica, and the nano brick cellular construction selects silver nanoparticle brick.
9. the optical information hiding method according to claim 2 based on super surface array structure, which is characterized in that described
In step 1, the operation wavelength selects 633nm.
10. the optical information hiding method according to claim 9 based on super surface array structure, which is characterized in that institute
When stating operation wavelength selection 633nm, it is highly 70nm that the length of nano brick, which is 160nm, width 80nm, cellular construction substrate
Side length is 300nm.
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