CN109814195A - Multi-functional super surface texture, super surface element and encryption method based on polarization - Google Patents
Multi-functional super surface texture, super surface element and encryption method based on polarization Download PDFInfo
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- CN109814195A CN109814195A CN201910253203.4A CN201910253203A CN109814195A CN 109814195 A CN109814195 A CN 109814195A CN 201910253203 A CN201910253203 A CN 201910253203A CN 109814195 A CN109814195 A CN 109814195A
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Abstract
The invention discloses a kind of multi-functional super surface texture, super surface element and encryption method based on polarization, multi-functional super surface texture include transparent substrates and metal nano brick array；Metal nano brick array includes multiple nano bricks by array manner distribution on the substrate, and surface of the nano brick far from substrate is working face；Substrate is divided into multiple square base units by the nano brick, and its corresponding base unit of nano brick forms nanometer block assembly, and the geometric parameter of the nanometer block assembly includes the length, width and height of nano brick and the side length of base unit；The geometric parameter of the nanometer block assembly is configured as: when making mutually perpendicular the first line polarisation of two beams in polarization direction perpendicular to working face incidence, wherein the reflectivity highest of a branch of first line polarisation, the transmissivity highest of another the first line polarisation of beam.The present invention can control the phase of transmitted light and the light intensity of reflected light simultaneously and separately.
Description
Technical field
The present invention relates to micronano optical technical fields, and in particular to a kind of multi-functional super surface texture based on polarization, super
Surface element and encryption method.
Background technique
Super surface can be designed as planar optical device as a kind of ultra-thin sub-wavelength structure to realize many functions,
And it can further improve the function on super surface by being embedded in more control modes.With traditional diffraction optical element phase
Than this ability on super surface has a clear superiority.For example, can be designed to generate not by changing incident polarization or wavelength
With the super surface hologram of image.
Since metal nano antenna can produce second harmonic, non-linear super surface can produce different image or difference
Orbital angular momentum state.Therefore, a variety of super surfaces that existing research direction, mainly integration have different function, thus
Different images or different orbital angular momentum states are superimposed.
Although having at present, Many researchers surpass surface texture control phase using sub-wavelength or polarization realizes many functions,
But it controls both responses simultaneously to have not been studied.Its main technological difficulties is: although using having the function of half-wave plate
Nanometer brick structure can realize super surface holography (Zheng G, M ü hlenbernd H, the Kenney M, Li of geometric phase respectively
G, Zentgraf T, &Zhang S.Metasurface holograms reaching 80%efficiency [J] .Nature
Nanotechnology, 2015,10 (4): 308-312.) and high-resolution nano printing (Yue F, Zhang C, Zang X F,
Wen D,Gerardot B D,Zhang S,&Chen X.High-resolution grayscale image hidden in
A laser beam [J] .Light:Science&Applications, 2018,7 (1): 17129.), but the two requires pair
The steering angle of nano brick is designed, and the value of nano brick steering angle is often there is difference in the two design result, however one
Denier design is completed, and the steering angle value of the nano brick of the two design is all again only unique value, and exactly the two values are deposited
In difference, therefore, it is impossible to meet the requirement that super surface is holographic and nano print is to steering angle value simultaneously.
Summary of the invention
In view of the deficiencies in the prior art, the purpose of the present invention is to provide a kind of multi-functional super table based on polarization
Face structure, holographic element and encryption method can control the phase of transmitted light and the light intensity of reflected light simultaneously and separately.
To achieve the above objectives, the technical solution adopted by the present invention is that: a kind of multi-functional super surface texture based on polarization,
Comprising:
Transparent substrates；
Metal nano brick array comprising by the multiple nano bricks of array manner distribution on the substrate, the nanometer
Surface of the brick far from substrate is working face；Substrate is divided into multiple square base units, the nano brick by the nano brick
Its corresponding base unit forms nanometer block assembly, the geometric parameter of the nanometer block assembly include nano brick length, width and height and
The side length of base unit；
The geometric parameter of the nanometer block assembly is configured as: mutually perpendicular the first line polarisation of two beams in polarization direction being made to hang down
Directly when working face incidence, wherein the reflectivity highest of a branch of first line polarisation, the transmissivity highest of another the first line polarisation of beam.
Further, with the working face perpendicular to the nano brick, and by the straight line of the cornerwise intersection point of the working face
Center line as the nano brick；
Spacing of the center line of all adjacent nano bricks on line direction and column direction is equal, and in the row direction
Spacing is equal to spacing in a column direction.
Further, the nano brick uses gold, silver or aluminium.
Further, the length, width and height of the nano brick are sub-wavelength dimensions.
Further, the operation wavelength of first line polarisation is 633nm, and the length, width and height of the nano brick are respectively
160nm, 80nm and 70nm, the side length of base unit are 300nm.
Further, the substrate is using quartz.
The present invention also provides a kind of super surface elements comprising:
Multi-functional super surface texture as described above；
Adjacent two edges with the base unit are respectively X and Y-axis establishes coordinate system, the long side and X of the nano brick
Angle between axis is the steering angle θ of nano brick；
The steering angle θ for each nano brick that the multi-functional super surface texture is included is configured as: making the second line polarisation
When with rotatory polarization perpendicular to multi-functional super surface texture incidence, the reflected light of the second line polarisation forms the first image, rotatory polarization
Transmitted light forms the second image；Wherein, the polarization direction of second line polarisation and highest first line polarisation of reflectivity is inclined
Vibration direction is identical.
Further, steering angle θ meets Malus' law:
I=I0(cosθ)2
Wherein, I0Light intensity when for the second line polarisation incidence, I are the light intensity of the reflected light of second line polarisation.
Further, phase change value ψ of the rotatory polarization after transmiting meets following formula: the θ of ψ=2.
The present invention also provides a kind of encryption methods, include the following steps:
One multi-functional super surface texture as described above, and each nano brick on the multi-functional super surface texture are provided
Steering angle θ is according to preset first image and preset second image setting, and the steering angle θ of each nano brick is configured
Are as follows: when making the second line polarisation and rotatory polarization perpendicular to multi-functional super surface texture incidence, the reflected light of the second line polarisation forms the
The transmitted light of one image, rotatory polarization forms the second image；Wherein, the polarization direction of second line polarisation and reflectivity are highest
The polarization direction of first line polarisation is identical, and the adjacent two edges with the base unit are respectively X and Y-axis establishes coordinate system, institute
State angle of the steering angle θ of nano brick between the long side and X-axis of nano brick；
Use multi-functional super surface texture described in the second line polarisation and rotatory polarization vertical incidence；
The multi-functional super surface texture forms the first image and the second image, and the first image is target image and interference
One in image, the second image is another in target image and interference image.
Compared with the prior art, the advantages of the present invention are as follows:
(1) multi-functional super surface texture provided by the invention, the light intensity of complex reflex light and two kinds of phase tune of transmitted light
Prosecutor formula, two kinds of control methods can be controlled independently, can generate a near field gray level image and a far field hologram simultaneously
Picture, and two images will not influence each other.
(2) nano brick cell geometry parameter is sub-wavelength grade, therefore, multi-functional super surface texture volume is small, it is light-weight,
Can be highly integrated, it is adapted to the development of the following miniaturization, micromation.Since multi-functional super surface texture is two step plane knots
Structure, thus processing and manufacturing, in terms of relatively simple, save the cost.
It (3), can not be from near-field pattern since multi-functional super surface texture generates the irrelevance of near-field image and far field image
As being inferred to far field image, the target image that one in near-field image and far field image is encrypted as needs, another work
For interference image, it can be achieved that encryption display, this encryption technology can be provided for following safe practice a kind of new method with
Approach, such as Steganography, anti-counterfeiting detection and ghost imaging etc..
Detailed description of the invention
Fig. 1 is a kind of multi-functional super surface texture working principle diagram based on polarization provided in an embodiment of the present invention；
Fig. 2 is nano brick cell schematics provided in an embodiment of the present invention；
Fig. 3 is multi-functional super surface texture transflector rate scanning figure provided in an embodiment of the present invention；
Fig. 4 is that multi-functional super surface texture provided in an embodiment of the present invention realizes Malus' law schematic diagram；
Fig. 5 is that multi-functional super surface texture provided in an embodiment of the present invention is realized while generating nearly far field image effect signal
Figure.
In figure: 1, substrate；10, base unit；2, nano brick.
Specific embodiment
Invention is further described in detail with reference to the accompanying drawings and embodiments.
It is shown in Figure 1, the embodiment of the invention provides a kind of multi-functional super surface texture based on polarization comprising thoroughly
Bright substrate 1 and metal nano brick array；Metal nano brick array includes multiple nano bricks by array manner distribution on the base 1
2,2 one side of nano brick is connected with substrate 1 and the another side i.e. surface far from substrate 1 is working face, nano brick 2 using gold, silver or
Aluminium, the present embodiment is using silver, and in the preparation, silver nanoparticle brick is deposited on the quartz substrate surface of melting.Due to multi-functional super table
Face structure be two step plane structures, therefore processing and manufacturing, in terms of relatively simple, save the cost.
Referring to figs. 1 and 2, substrate 1 is divided into multiple square base units 10 by nano brick 2, nano brick 2 and its
Corresponding base unit 10 forms nanometer block assembly, the geometric parameter of nanometer block assembly include the length L of nano brick 2, width W,
The side length C of height H and base unit 10, above-mentioned length, width and height and side length are sub-wavelength grade, therefore, multi-functional super surface texture
It is small in size, light-weight, can be highly integrated, be adapted to the development of the following miniaturization, micromation；With the work perpendicular to nano brick 2
Face, and the center line by the straight line of the cornerwise intersection point of the working face as the nano brick 2；All adjacent nano bricks 2
Spacing of the center line on line direction and column direction is equal, and spacing in the row direction is equal to spacing in a column direction.
It is shown in Figure 1, in order to make the multi-functional super surface texture be equivalent to polarizer, the geometric parameter of nanometer block assembly
It is configured as: when making mutually perpendicular the first line polarisation of two beams in polarization direction perpendicular to working face incidence, wherein a branch of First Line
The reflectivity highest of polarisation, the transmissivity highest of another the first line polarisation of beam.
Shown in Figure 1, the adjacent two edges with base unit 10 are respectively that X and Y-axis establish coordinate system, with operation wavelength
For λ=633nm, using electromagnetic simulation software modeling and simulating, two beam First Lines of the polarization direction respectively along X-axis and Y-axis are inclined
Light (being referred to as x line polarisation and y line polarisation) is both perpendicular to working face incidence, the scanning nano block assembly under operation wavelength
Geometric parameter, including L, W, H, C, with the reflectivity highest transmissivity of x line polarisation is minimum and the transmissivity highest of y line polarisation is anti-
The minimum optimization object of rate is penetrated, scanning result is as shown in Figure 3.In operation wavelength λ=633nm, x line polarisation reflectivity and y line
Polarizing transmission rate is all larger than 90%, and x line polarisation transmissivity and y line polarisation reflectivity are respectively less than 10%, at this time nano unit
Geometric parameter are as follows: L=160nm, W=80nm, H=70nm, C=300nm.Therefore, when operation wavelength is λ=633nm, excellent
Under the geometric parameter for the nanometer block assembly changed, the reflection of x line polarisation, the y line that can make to be incident in multi-functional super surface texture are inclined
Light transmission.
Shown in Figure 4, the adjacent two edges with base unit 10 are respectively X and Y-axis establishes coordinate system, nano brick 2
Long side and X-axis angle are the steering angle θ of the nano brick 2, for incident the second line polarisation (ensure that and reflect,
Second line polarisation is identical as the polarization direction of highest first line polarisation of reflectivity namely the second line polarisation uses x line polarisation) and
It says (polarization direction that the double-head arrow of the rightmost side is the second incident line polarisation in the small figure in the top Fig. 4), is being θ's by steering angle
After nano brick 2, the second line polarisation is reflected and its polarization direction is modulated to X-axis at θ angle (above Fig. 4 in small figure
Intermediate double-head arrow is the polarization direction after the second line polarisation is reflected), while light intensity is also modulated, and θ meets Malus
Law:
I=I0(cosθ)2
Wherein, I0Light intensity when for the second line polarisation incidence, I are the reflected light light intensity of the second line polarisation.
It can be seen that being incident in multi-functional super surface texture with the line polarisation in a constant polarisation direction, change can be passed through
The steering angle θ of each nano brick 2 adjusts the light intensity of reflected light, to realize gray modulation.It will be every on multi-functional super surface texture
A nanometer of block assembly can pass through nanometer on gray scale, that is, each nanometer of block assembly of each pixel of adjusting as a pixel
The steering angle θ of brick 2 come adjust and near field show one reflection high resolution gray image.In addition, because nano brick 2
The efficient working range of steering angle θ is 0 °~180 °, as shown in Figure 4, when incident intensity and intensity of reflected light keep permanent simultaneously
Periodically, there are two selectable value, i.e. θ and 180 ° of-θ for the steering angle θ tool of nano brick 2.
Since the function of multi-functional super surface texture is equivalent to polarizer, by taking nanometer block assembly as an example, as shown in Figure 1, with
The adjacent two edges of base unit 10 are respectively X and Y-axis establishes coordinate system, then are equivalent to the Jones matrix of the nano brick of polarizer
It may be expressed as:
When rotatory polarization incidence, (Jones vector of left-handed rotatory polarization or dextrorotation rotatory polarization is), it is saturating by nano brick 2
Penetrating rear light vector may be expressed as:
From the above equation, we can see that the transmitted light of rotatory polarization is the abnormal polorization state rotatory polarization and one for having 2 θ phase change amounts
The unmodulated polarization state rotatory polarization in the same direction of a phase.It follows that the steering angle θ and rotatory polarization of nano brick 2 are after transmiting
Phase change value ψ meet the θ of ψ=2.It therefore, can be by changing the steering angle θ of nano brick 2 come regulation and control rotatory polarization warp
Phase change value ψ after transmission.It, can will be more in conjunction with simulated annealing using the phase-modulation of multi-functional super surface texture
The super surface structure design of function is a hologram sheet, and a hologram is presented in far field by incident rotatory polarization.
Regulate and control while to realize light intensity and phase and be independent of each other, incident light includes that a branch of line polarisation and a branch of circle are inclined
Light, after the regulation of multi-functional super surface texture, the polarization direction of line polarisation and light intensity are modulated, and the phase of rotatory polarization is adjusted
System.
In conclusion the multi-functional super surface texture in the present invention exists simultaneously two kinds of mutual independent control methods, i.e.,
Phase-modulation is carried out to rotatory polarization, polarization and intensity modulation are carried out to line polarisation.Due to above-mentioned polarization regulation when in same ash
When the display of degree, the steering angle of nano brick has two kinds of angle Selections of θ and 180 ° of-θ, therefore in phase regulation, two kinds of nano bricks
Steering angle can provide two kinds of phase regulation amounts, i.e. 2 θ and 360 ° of -2 θ, therefrom select one kind according to the actual needs, from
And can determine steering angle θ, for example be computed, the value to be selected for meeting the phase change value of phase regulation is 90 ° and 270 °, if phase
The value to be selected of position changing value is 90 °, then θ=45 °, that is, the steering angle for meeting intensity modulation can select i.e. from 45 ° and 135 °
It can.Therefore, the present invention provides two kinds of design freedoms for holographic designs, can be equivalent to the binary optical with two step structures
Calculating holographic element, both design freedoms, it is ensured that the present invention can meet phase controlling and polarization and light intensity control simultaneously
The requirement of system.
Based on above-mentioned principle and design, multi-functional super surface texture can generate two kinds mutually by the modulation of two ways
The response not influenced generates the high resolution gray image an of reflection near field by Polarization Modulation and passes through phase tune
System generates a hologram image in far field.It is complete as far field using " Lina " humanoid image as near field gray level image, letter " SOS "
Breath image carries out the design on multi-functional super surface, and effect is as shown in Figure 5.Since two kinds of responses are independent of each other, the near-field pattern of generation
Picture and far field image also non-correlation, so far field image can not be inferred to from near-field image, by near-field image and far field image
In one as the target image that encrypts of needs, another is as interference image, it can be achieved that encryption display.If by far field holography
The target image that image is encrypted as needs can not then speculate the information to hologram image near field gray level image, and vice versa,
So the encryption technology of high safety performance may be implemented, and be applied to Steganography, anti-counterfeiting detection and ghost imaging etc..
The embodiment of the invention also provides a kind of super surface elements comprising multi-functional super surface texture；With base unit
10 adjacent two edges are respectively X and Y-axis establishes coordinate system, and the angle between the long side and X-axis of nano brick 2 is nano brick 2
Steering angle θ；The steering angle θ for each nano brick 2 that multi-functional super surface texture is included is configured as: making the second line polarisation and circle
When polarisation is perpendicular to multi-functional super surface texture incidence, the reflected light of the second line polarisation forms the first image, the transmission of rotatory polarization
Light forms the second image, wherein the polarization direction phase of the polarization direction of the second line polarisation and highest first line polarisation of reflectivity
Together.
The embodiment of the invention also provides a kind of encryption methods, include the following steps:
S1: a multi-functional super surface texture is provided, and the steering angle θ of each nano brick 2 is on multi-functional super surface texture
According to preset first image and preset second image setting, and the steering angle θ of each nano brick 2 is configured as: making
When two line polarisations and rotatory polarization are perpendicular to multi-functional super surface texture incidence, the reflected light of the second line polarisation forms the first image,
The transmitted light of rotatory polarization forms the second image；Wherein, the polarization direction of the second line polarisation and highest first line polarisation of reflectivity
Polarization direction it is identical, the adjacent two edges with base unit 10 are respectively X and Y-axis establishes coordinate system, the steering angle of nano brick 2
θ is the angle between the long side and X-axis of nano brick 2；
S2: the second line polarisation and the multi-functional super surface texture of rotatory polarization vertical incidence are used；Multi-functional super surface texture shape
At the first image and the second image, and the first image is target image and interferes one in image, and the second image is target figure
Picture and interference image in another.
The present invention is not limited to the above-described embodiments, for those skilled in the art, is not departing from
Under the premise of the principle of the invention, several improvements and modifications can also be made, these improvements and modifications are also considered as protection of the invention
Within the scope of.The content being not described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field.
Claims (10)
1. a kind of multi-functional super surface texture based on polarization, characterized in that it comprises:
Transparent substrates (1)；
Metal nano brick array comprising multiple nano bricks (2) on the substrate (1) are distributed in by array manner, it is described to receive
Surface of the rice brick (2) far from substrate (1) is working face；Substrate (1) is divided into multiple square base lists by the nano brick (2)
First (10), its corresponding base unit of the nano brick (2) (10) form nanometer block assembly, the geometry of the nanometer block assembly
Parameter includes the length, width and height of nano brick (2) and the side length of base unit (10)；
The geometric parameter of the nanometer block assembly is configured as: make mutually perpendicular the first line polarisation of two beams in polarization direction perpendicular to
When working face incidence, wherein the reflectivity highest of a branch of first line polarisation, the transmissivity highest of another the first line polarisation of beam.
2. multi-functional super surface texture as described in claim 1, it is characterised in that: with the work perpendicular to the nano brick (2)
Make face, and the center line by the straight line of the cornerwise intersection point of the working face as the nano brick (2)；
Spacing of the center line of all adjacent nano bricks (2) on line direction and column direction is equal, and in the row direction
Spacing is equal to spacing in a column direction.
3. multi-functional super surface texture as described in claim 1, it is characterised in that: the nano brick (2) using gold, silver or
Aluminium.
4. multi-functional super surface texture as described in claim 1, it is characterised in that: the length, width and height of the nano brick (2) are
Sub-wavelength dimensions.
5. multi-functional super surface texture as described in claim 1, it is characterised in that: the operation wavelength of first line polarisation is
633nm, the length, width and height of the nano brick (2) are respectively 160nm, 80nm and 70nm, and the side length of base unit (10) is 300nm.
6. multi-functional super surface texture as described in claim 1, it is characterised in that: the substrate (1) is using quartz.
7. a kind of super surface element, characterized in that it comprises:
Multi-functional super surface texture as described in claim 1；
Adjacent two edges with the base unit (10) are respectively X and Y-axis establishes coordinate system, the long side of the nano brick (2)
Angle between X-axis is the steering angle θ of nano brick (2)；
The steering angle θ for each nano brick (2) that the multi-functional super surface texture is included is configured as: make the second line polarisation and
When rotatory polarization is perpendicular to multi-functional super surface texture incidence, the reflected light of the second line polarisation forms the first image, rotatory polarization it is saturating
It penetrates light and forms the second image；Wherein, the polarization of the polarization direction of second line polarisation and highest first line polarisation of reflectivity
Direction is identical.
8. super surface element as claimed in claim 7, which is characterized in that steering angle θ meets Malus' law:
I=I0(cosθ)2
Wherein, I0Light intensity when for the second line polarisation incidence, I are the light intensity of the reflected light of second line polarisation.
9. super surface element as claimed in claim 7, which is characterized in that phase change value of the rotatory polarization after transmiting
ψ meets following formula: the θ of ψ=2.
10. a kind of encryption method, which comprises the steps of:
One multi-functional super surface texture as described in claim 1, and each nanometer on the multi-functional super surface texture are provided
The steering angle θ of brick (2) is according to preset first image and preset second image setting, and turn of each nano brick (2)
Be configured as to angle θ: when making the second line polarisation and rotatory polarization perpendicular to multi-functional super surface texture incidence, the second line polarisation it is anti-
It penetrates light and forms the first image, the transmitted light of rotatory polarization forms the second image；Wherein, the polarization direction of second line polarisation and anti-
The polarization direction for penetrating highest first line polarisation of rate is identical, and the adjacent two edges with the base unit (10) are respectively X and Y-axis
Coordinate system is established, the steering angle θ of the nano brick (2) is the angle between the long side and X-axis of nano brick (2)；
Use multi-functional super surface texture described in the second line polarisation and rotatory polarization vertical incidence；
The multi-functional super surface texture forms the first image and the second image, and the first image is target image and interference image
In one, the second image be target image and interfere image in another.
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