CN117055211B - Design method of optical encryption structure and near-far field multi-polarization optical encryption system - Google Patents
Design method of optical encryption structure and near-far field multi-polarization optical encryption system Download PDFInfo
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Abstract
The application provides a design method of an optical encryption structure and a near-far field multi-polarization optical encryption system. The design method of the optical encryption structure comprises the steps of obtaining a far-field target image and a near-field target image to be encrypted, wherein the far-field target image comprises a first far-field target image and a second far-field target image, and the near-field target image comprises a first near-field target image and a second near-field target image; optimizing by utilizing an optimization algorithm and a target amplitude phase relation to obtain optimized first far-field target phase distribution and second far-field target phase distribution and first near-field target amplitude distribution and second near-field target amplitude distribution; screening a plurality of candidate micro-nano structures to obtain a target micro-nano structure; and arranging a plurality of target micro-nano structures to form an optical encryption structure. The optical encryption structure obtained by the design method can encrypt four images simultaneously, realizes efficient encryption of optical signals with various polarization states, and has a simple system structure.
Description
Technical Field
The present disclosure relates to the field of optical encryption technologies, and in particular, to a design method of an optical encryption structure and a near-far field multi-polarization optical encryption system.
Background
With the rapid development of modern communication technology, the security of information transmission is widely studied. Among them, an optical encryption technology having characteristics of high-speed parallel processing of image data, multiple degrees of freedom, and the like has been attracting attention.
However, conventional optical encryption techniques typically use complex optical elements and complex encryption algorithms, adding to the complexity and cost of the system.
Disclosure of Invention
The application provides a design method of an optical encryption structure and a near-far field multi-polarization optical encryption system, which can simplify the encryption system.
One aspect of the present application provides a method for designing an optical encryption structure, for designing a micro-nano structure of the optical encryption structure, the method comprising:
acquiring a far-field target image and a near-field target image to be encrypted, wherein the far-field target image comprises a first far-field target image and a second far-field target image, and the near-field target image comprises a first near-field target image and a second near-field target image;
determining first far-field target image data according to the image characteristics of the first far-field target image, and determining second far-field target image data according to the image characteristics of the second far-field target image;
determining a first near-field target amplitude distribution according to the image characteristics of the first near-field target image, and determining a second near-field target amplitude distribution according to the image characteristics of the second near-field target image;
optimizing by utilizing an optimization algorithm and a target amplitude phase relation according to the first far-field target image data, the second far-field target image data, the first near-field target amplitude distribution and the second near-field target amplitude distribution to obtain optimized first far-field target phase distribution and second far-field target phase distribution and first near-field target amplitude distribution and second near-field target amplitude distribution;
screening a plurality of candidate micro-nano structures according to the first far-field target phase distribution and the second far-field target phase distribution to obtain target micro-nano structures;
and arranging a plurality of target micro-nano structures to form the optical encryption structure.
According to the design method of the optical encryption structure, the first far-field target phase distribution and the second far-field target phase distribution, the first near-field target amplitude distribution and the second near-field target amplitude distribution corresponding to the four target images are obtained through optimization, and the micro-nano structure arrangement meeting the requirements is screened to form the optical encryption structure, so that the single optical encryption structure can realize efficient encryption of near-field optical signals with multiple polarization states at the same time, no additional optical devices or complicated modulation devices are needed, and the system structure is simple.
Further, the first far-field target image comprises an image with a polarization state along the horizontal direction, wherein the image is obtained by transmitting an optical signal output by a light source through the optical encryption structure; and/or
The second far-field target image comprises an image of a polarization state along the vertical direction, which is obtained by transmitting the optical signal output by the light source through the optical encryption structure; and/or
The first near-field target image comprises an image with a polarization state 45 degrees with the vertical direction, wherein the image is obtained by transmitting an optical signal output by a light source through the optical encryption structure; and/or
The second near-field target image comprises an image with a polarization state of-45 degrees relative to the vertical direction, wherein the image is obtained by transmitting an optical signal output by a light source through the optical encryption structure.
Further, the target amplitude phase relationship includes the following relationship:
wherein,for said first far-field target phase distribution, < > j >>For the second far-field target phase distribution, E 1 For the first near field target amplitude profile; and/or
The target amplitude phase relationship includes the following relationship:
wherein,for said first far-field target phase distribution, < > j >>For the second far-field target phase distribution, E 2 For the second near field target amplitude profile.
Further, the screening the candidate micro-nano structures according to the first far-field target phase distribution and the second far-field target phase distribution to obtain target micro-nano structures includes:
determining the horizontal phase distribution and the vertical phase distribution of the candidate micro-nano structure according to the parameter information of the candidate micro-nano structure;
and screening the candidate micro-nano structure with the horizontal phase distribution equal to the first far-field target phase distribution and the vertical phase distribution equal to the second far-field target phase distribution as the target micro-nano structure.
Further, the method further comprises the following steps: acquiring a first far-field image, a second far-field image, a first near-field image and a second near-field image which are obtained by transmitting an optical signal output by a light source through the optical encryption structure;
and if the first far-field image is inconsistent with the first far-field target image and/or the second far-field image is inconsistent with the second far-field target image and/or the first near-field image is inconsistent with the first near-field target image and/or the second near-field image is inconsistent with the second near-field target image, screening a plurality of candidate micro-nano structures again according to the first far-field target phase distribution and the second far-field target phase distribution, and obtaining the target micro-nano structure.
Further, the optical signal output by the light source comprises linearly polarized light with a polarization state of 45 degrees with respect to the horizontal direction.
Another aspect of the present application provides a near-far field multi-polarization state optical encryption system, comprising:
a light source for outputting an optical signal;
the imaging component is positioned on the light path of the optical signal output by the light source; and
The optical encryption structure obtained by the design method of any one of the above claims is disposed between the light source and the imaging component, the optical encryption structure is configured to receive the optical signal, transmit at least a portion of the optical signal to the imaging component, and the imaging component is configured to form a first far-field target image, a second far-field target image, a first near-field target image, and a second near-field target image, where the first far-field target image, the second far-field target image, the first near-field target image, and the second near-field target image are images of the decrypted optical signal.
Further, the imaging assembly comprises a polarization analyzer, a first imaging surface and a second imaging surface, the polarization analyzer is arranged between the optical encryption structure and the imaging assembly, the first imaging surface is far away from the optical encryption structure relative to the second imaging surface, the polarization analyzer is used for enabling the light signals in a specific direction to pass through, the first imaging surface is used for forming the first far-field target image and the second far-field target image, and the second imaging surface is used for forming the first near-field target image and the second near-field target image.
Further, the polarization-detecting device is used for enabling the light signals with the polarization states in the horizontal direction to pass through; and/or
The polarization-detecting device is used for enabling the light signals with polarization states in the vertical direction to pass through; and/or
The polarization-detecting device is used for enabling the optical signals with the polarization state and the vertical direction in the 45-degree direction to pass through; and/or
The polarization-detecting device is used for enabling the light signals with the polarization state in the direction of-45 degrees to pass through.
Further, the light source comprises means for outputting linearly polarized light having a polarization state of 45 ° to the horizontal direction.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.
FIG. 1 is a schematic diagram of an embodiment of a near-far field multi-polarization optical encryption system according to the present application;
FIG. 2 is a schematic diagram of the near-far field multi-polarization optical encryption system of FIG. 1;
FIG. 3 illustrates a first far-field target image decrypted using the near-far-field multi-polarization optical encryption system of FIG. 1;
FIG. 4 is a diagram of a second far-field target image decrypted using the near-far-field multi-polarization optical encryption system of FIG. 1;
FIG. 5 is a diagram illustrating a first near-field target image decrypted by the near-far field multi-polarization optical encryption system of FIG. 1;
FIG. 6 is a diagram illustrating a second near-field target image decrypted using the near-far field multi-polarization optical encryption system of FIG. 1;
FIG. 7 is a flow chart illustrating an embodiment of a method for designing an optical encryption architecture according to the present application;
fig. 8 is a flowchart illustrating an embodiment of step S500 of the method for designing an optical encryption structure shown in fig. 7.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present application as detailed in the accompanying claims.
The terminology used in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The terms "first," "second," and the like in the description and in the claims, are not used for any order, quantity, or importance, but are used for distinguishing between different elements. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "several" means at least two. Unless otherwise indicated, the terms "front," "rear," "lower," and/or "upper" and the like are merely for convenience of description and are not limited to one location or one spatial orientation. The word "comprising" or "comprises", and the like, means that elements or items appearing before "comprising" or "comprising" are encompassed by the element or item recited after "comprising" or "comprising" and equivalents thereof, and that other elements or items are not excluded. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
The design method of the optical encryption structure is used for designing the micro-nano structure of the optical encryption structure, and comprises the following steps: acquiring a far-field target image and a near-field target image to be encrypted, wherein the far-field target image comprises a first far-field target image and a second far-field target image, and the near-field target image comprises a first near-field target image and a second near-field target image; determining first far-field target image data according to the image characteristics of the first far-field target image, and determining second far-field target image data according to the image characteristics of the second far-field target image; determining a first near-field target amplitude distribution according to the image characteristics of the first near-field target image, and determining a second near-field target amplitude distribution according to the image characteristics of the second near-field target image; optimizing by utilizing an optimization algorithm and a target amplitude phase relation according to the first far-field target image data, the second far-field target image data, the first near-field target amplitude distribution and the second near-field target amplitude distribution to obtain optimized first far-field target phase distribution and second far-field target phase distribution and first near-field target amplitude distribution and second near-field target amplitude distribution; screening a plurality of candidate micro-nano structures according to the first far-field target phase distribution and the second far-field target phase distribution to obtain target micro-nano structures; and arranging a plurality of target micro-nano structures to form the optical encryption structure.
According to the design method of the optical encryption structure, the first far-field target phase distribution and the second far-field target phase distribution, the first near-field target amplitude distribution and the second near-field target amplitude distribution corresponding to the four target images are obtained through optimization, and the micro-nano structure arrangement meeting the requirements is screened to form the optical encryption structure, so that the single optical encryption structure can realize efficient encryption of near-field optical signals with multiple polarization states at the same time, no additional optical devices or complicated modulation devices are needed, and the system structure is simple.
The near-far field multi-polarization optical encryption system provided by the application comprises: the light source is used for outputting an optical signal; the imaging component is positioned on the light path of the optical signal output by the light source; the optical encryption structure is arranged between the light source and the imaging component, the optical encryption structure is used for receiving the light signals, transmitting at least the light signals to the imaging component, and the imaging component is used for forming a first far-field target image, a second far-field target image, a first near-field target image and a second near-field target image, wherein the first far-field target image, the second far-field target image, the first near-field target image and the second near-field target image are images after the light signals are decrypted.
The method for designing the optical encryption structure and the near-far field multi-polarization optical encryption system are described in detail below with reference to the accompanying drawings. The features of the examples and embodiments described below may be combined with each other without conflict.
Fig. 1 is a schematic structural diagram of an embodiment of a near-far field multi-polarization optical encryption system 1 according to the present application. Fig. 2 is a schematic diagram of the near-far field multi-polarization optical encryption system 1 shown in fig. 1. The near-far field multi-polarization state optical encryption system 1 of the present embodiment includes a light source 100, an imaging assembly 200, and an optical encryption structure 300. The light source 100 is for outputting an optical signal. The imaging assembly 200 is located on the optical path of the optical signal output by the light source 100. The optical encryption structure 300 is disposed between the light source 100 and the imaging assembly 200, the optical encryption structure 300 is configured to receive the optical signal, transmit at least the optical signal to the imaging assembly 200, and the imaging assembly 200 is configured to form a first far-field target image, a second far-field target image, a first near-field target image, and a second near-field target image, where the first far-field target image, the second far-field target image, the first near-field target image, and the second near-field target image are images of the decrypted optical signal.
Fig. 3 shows a first far-field target image decrypted by the near-far-field multi-polarization optical encryption system 1 shown in fig. 1. Fig. 4 shows a second far-field target image decrypted by the near-far-field multi-polarization optical encryption system 1 shown in fig. 1. Fig. 5 shows a first near-field target image decrypted by the near-far-field multi-polarization optical encryption system 1 shown in fig. 1. Fig. 6 shows a second near-field target image decrypted by the near-far-field multi-polarization optical encryption system 1 shown in fig. 1. It should be noted that the first far-field target image, the second far-field target image, the first near-field target image, and the second near-field target image are images to be encrypted. The first far-field target image, the second far-field target image, the first near-field target image, and the second near-field target image may be any two-dimensional images. In some embodiments, the first far-field target image, the second far-field target image, the first near-field target image, and the second near-field target image may each include numbers, letters, chinese characters, two-dimensional codes, and other images. It can be understood that the four target images can be non-associated images or associated images.
In some embodiments, the optical encryption structure 300 includes a super surface. A supersurface is a material with a special structure that can control the propagation and reflection behavior of optical signals. The super surface can realize the height regulation and control of the phase, amplitude and polarization state of the incident light by adjusting the surface structure and material parameters. Therefore, the super surface has wide application prospect in the fields of optical communication, information processing, safe transmission and the like. Conventional optical encryption methods typically rely on complex encryption algorithms and key management compared to super-surface based optical encryption methods, but in some application scenarios, conventional optical encryption scheme methods have limitations in terms of security and efficiency.
In some embodiments, the subsurface includes a substrate and a plurality of micro-nano structures disposed on the substrate, the plurality of micro-nano structures being arranged to form the subsurface. Alternatively, the micro-nanostructure material includes silicon, such as crystalline silicon and amorphous silicon; the micro-nanostructure material may also include metallic materials such as gold and silver. Of course, the micro-nano structure material may also include other materials, which will not be described in detail. In some embodiments, the material of the substrate includes silicon dioxide or other materials.
In some embodiments, the imaging assembly 200 includes a polarization analyzer, a first imaging plane 210 and a second imaging plane 220, the polarization analyzer being disposed between the optical encryption structure 300 and the imaging assembly 200, i.e., the polarization analyzer is positioned in front of the first imaging plane 210 and the second imaging plane 220, the first imaging plane 210 being disposed away from the optical encryption structure 300 with respect to the imaging plane, the polarization analyzer being configured to pass light signals in a specific direction, the first imaging plane 210 being configured to form a first far-field target image and a second far-field target image, and the second imaging plane 220 being configured to form a first near-field target image and a second near-field target image. In some embodiments, the polarization analyzer comprises a polarization analyzer, in which the multi-polarization state optical encryption system of the present application utilizes the polarization analyzer to change the polarization state of the optical signal transmitted through the optical encryption structure 300.
In some embodiments, the polarization analyzer is configured to pass the light signal having the polarization state in the horizontal direction, and when the polarization analyzer receives the light signal having the polarization state in the horizontal direction, the polarization analyzer obtains the first far-field target image. The polarization detection device is used for enabling the light signals with the polarization states in the vertical direction to pass through, and at the moment, a second far-field target image is obtained when the polarization detection device receives the light signals with the polarization states in the horizontal direction. The polarization analyzer is used for enabling the light signals with the polarization state being 45 degrees to pass through the polarization analyzer, and at the moment, the first near-field target image is obtained when the polarization analyzer receives the light signals with the polarization state in the horizontal direction. The polarization analyzer is used for enabling the light signals with the polarization state being in the-45-degree direction with the vertical direction to pass through, and at the moment, the second near-field target image is obtained when the polarization analyzer receives the light signals with the polarization state in the horizontal direction.
In some embodiments, the light source 100 includes means for outputting linearly polarized light having a polarization state of 45 ° from horizontal. The parameters of the optical signal output by the optical source 100 and the distance between the optical source 100 and the optical encryption structure 300 are not limited in this application.
Fig. 7 is a flow chart illustrating an embodiment of a design method of an optical encryption structure according to the present application. The design method of the optical encryption structure is used for designing the micro-nano structure of the optical encryption structure. The design method includes steps S100 to S600:
in step S100, a far-field target image and a near-field target image to be encrypted are acquired, the far-field target image including a first far-field target image and a second far-field target image, and the near-field target image including a first near-field target image and a second near-field target image.
In step S200, first far-field target image data is determined from image features of the first far-field target image, and second far-field target image data is determined from image features of the second far-field target image.
In step S300, a first near-field target amplitude distribution is determined from the image features of the first near-field target image, and a second near-field target amplitude distribution is determined from the image features of the second near-field target image.
In step S400, optimization is performed according to the first far-field target image data, the second far-field target image data, the first near-field target amplitude distribution and the second near-field target amplitude distribution by using an optimization algorithm and a target amplitude phase relation, so as to obtain optimized first far-field target phase distribution and second far-field target phase distribution, and first near-field target amplitude distribution and second near-field target amplitude distribution.
In step S500, a plurality of candidate micro-nano structures are screened according to the first far-field target phase distribution and the second far-field target phase distribution, so as to obtain target micro-nano structures.
In step S600, a plurality of target micro-nano structures are arranged to form an optical encryption structure.
According to the design method of the optical encryption structure, the first far-field target phase distribution and the second far-field target phase distribution, the first near-field target amplitude distribution and the second near-field target amplitude distribution corresponding to the four target images are obtained through optimization, and micro-nano structure arrangement meeting requirements is screened to form the optical encryption structure, so that the single optical encryption structure can realize efficient encryption of near-field and far-field optical signals in multiple polarization states at the same time, no additional optical devices or complicated modulation devices are needed, and the system structure is simple.
Specifically, the optimizing using the phase optimization algorithm and the target amplitude phase relationship in step S400 may further include steps S410 to S450:
in step S410, according to the determined first far-field target image, second far-field target image, first near-field target image and second near-field target image, for example, as shown in fig. 3 to 6, the first near-field target image is a letter L, the second near-field target image is a letter F, the first far-field target image is a letter M, and the second far-field target image is a letter J, corresponding target image amplitude distribution data are obtained, which are dataL, dataF, dataM and dataJ respectively.
In step S420, since the first far-field target image and the second far-field target image are determined by the phase distribution, the first near-field target image and the second near-field target image are determined by the amplitude distribution. The amplitude distribution of the four target images in the present application is determined by the phase distribution of the two far-field target images. Wherein the amplitude distribution of the near-field image is related to the phase distribution of the far-field image, for example, the amplitude distribution of the first near-field target image L is equal to the cosine of the phase difference between the first far-field target image M and the second far-field target image J, the amplitude distribution of the second near-field target image F is equal to the sine of the phase difference between the first far-field target image M and the second far-field target image J, and the amplitude distribution information dataL 'and dataF' of the two near-field target images L and F are obtained according to the above-mentioned target amplitude-phase relationship. Amplitude distribution information dataM 'and dataJ' of the two far-field target images M and J are obtained by performing inverse fourier transform on the phases.
In step S430, an error with the target amplitude distribution data dataL, dataF, dataM and dataJ is calculated.
In step S440, an optimization algorithm, such as topology optimization, is used to set the phase optimization range to 0-2pi, and through multiple iterative optimization, error is gradually reduced, and the phase optimization range approaches the target amplitude distribution.
In step S450, the phase distribution of the optimal result is extracted, and the optimized first far-field target phase distribution and the second far-field target phase distribution are obtained.
In some embodiments, the method for designing an optical encryption structure according to the embodiments of the present application may further include steps S700 to S800:
in step S700, a first far-field image, a second far-field image, a first near-field image, and a second near-field image obtained by transmitting an optical signal output by a light source by an optical encryption structure are acquired.
In step S800, if the first far-field image is inconsistent with the first far-field target image and/or the second far-field image is inconsistent with the second far-field target image and/or the first near-field image is inconsistent with the first near-field target image and/or the second near-field image is inconsistent with the second near-field target image, the candidate micro-nano structures are screened again according to the first far-field target phase distribution and the second far-field target phase distribution, and the target micro-nano structure is obtained.
Fig. 8 is a flowchart illustrating an embodiment of step S500 of the method for designing an optical encryption structure shown in fig. 7. In some embodiments, step S500 of the method for designing an optical encryption structure according to the embodiments of the present application may include steps S510 to S520:
in step S510, a horizontal phase distribution and a vertical phase distribution of the candidate micro-nano structure are determined according to the parameter information of the candidate micro-nano structure.
In step S520, candidate micro-nano structures having a horizontal phase distribution equal to the first far-field target phase distribution and a vertical phase distribution equal to the second far-field target phase distribution are screened as target micro-nano structures.
In some embodiments, the first far-field target image comprises an image of the optical encryption structure in a horizontal direction of polarization state obtained by transmitting an optical signal output by the light source. The second far-field target image comprises an image with a polarization state along the vertical direction, wherein the image is obtained by transmitting an optical signal output by the light source through the optical encryption structure. The first near-field target image comprises an image with a polarization state 45 degrees with respect to the vertical direction, wherein the image is obtained by transmitting an optical signal output by a light source through an optical encryption structure. The second near-field target image comprises an image with a polarization state of-45 degrees relative to the vertical direction, wherein the image is obtained by transmitting an optical signal output by the light source through the optical encryption structure.
In some embodiments, the light signal output by the light source includes a polarization state and a horizontal direction45 deg. linear polarized light. It will be appreciated that the jones matrix represents the amplitude and phase relationship of light in different polarization directions. For linearly polarized light, the jones matrix may represent the relationship between the amplitude and phase of the light in the horizontal and vertical directions. When the incident light is linearly polarized at 45 DEG to the horizontal direction, the intensity and phase of the electric field of the incident light can be expressed as Jones matrixWhen the super surface is of a highly transmissive structure, i.e. has little effect on the amplitude of incident light or has negligible image, the phase regulation effect of the super surface on the optical signal is only considered, and the phase regulation of the super surface on the optical signal in the horizontal and vertical directions is respectively setThe optical signal is regulated to +.>
Wherein,
substituting the two formulas into the optical signal expression after the super-surface regulation can obtain:
wherein,the optical signals respectively representing the polarized states and the vertical direction form included angles of +45 DEG and-45 DEG, and the expression can be seen that the amplitude of the two polarized states and the phase regulation of the super surface to the horizontal and vertical directions of the optical signals are +.>In the related, an analyzer is arranged at the rear side of the super surface, when the analyzer allows the light signal with the polarization state forming an included angle of +45 DEG with the vertical direction to pass through, the amplitude distribution of the signal light is formed by +.>The cosine value of the difference is determined, i.e. +.>When the polarization analyzer allows the light signal with the polarization state forming an included angle of-45 DEG with the vertical direction to pass through, the amplitude distribution of the signal light is formed by +.>The sine value of the difference is determined, i.e. +.>The intensity distribution of the near-field image is determined by the corresponding intensity distribution, and the intensity distribution of the near-field image is regulated and controlled by the phase of the super-surface light signal in the horizontal and vertical directions by the design method of the embodiment of the application>It was determined that, therefore, when the analyzer allowed the passage of optical signals having polarization states at an angle of ±45° to the vertical, a corresponding image could be observed at the near field location.
In some embodiments, derived according to the above formula, the target amplitude phase relationship comprises the following relationship:
wherein,for the first far-field target phase distribution, +.>For a second far-field target phase distribution, E 1 For a first near field target amplitude profile; and/or
The target amplitude phase relationship includes the following relationship:
wherein,for the first far-field target phase distribution, +.>For a second far-field target phase distribution, E 2 Is the second near field target amplitude profile.
In the above embodiment, the relational expression may beAnd
Optical signal after super-surface regulationWhen the polarization analyzer allows the light signal with the polarization state along the horizontal direction to pass through, the phase of the super surface in the horizontal direction of the light signal is regulated and controlled to be +.>When the polarization analyzer allows the light signal with the polarization state along the vertical direction to pass through, the phase of the super surface in the vertical direction of the light signal is regulated and controlled to be +.>And far-field images are mapped by the far-field imagesPhase distribution determination, by the design method of the embodiment of the application, the phase distribution of far-field images is regulated by the phase of the super-surface optical signal in the horizontal and vertical directions>It is determined that, therefore, when the analyzer allows the passage of optical signals having polarization states in the horizontal or vertical direction, a corresponding image can be observed at a far field location.
For method embodiments, reference is made to the description of device embodiments for the relevant points, since they essentially correspond to the device embodiments. The method embodiments and the device embodiments complement each other.
The foregoing description of the preferred embodiments of the present invention is not intended to limit the invention to the precise form disclosed, and any modifications, equivalents, improvements and alternatives falling within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A method for designing an optical encryption structure for designing a micro-nano structure of the optical encryption structure, the method comprising:
acquiring a far-field target image and a near-field target image to be encrypted, wherein the far-field target image comprises a first far-field target image and a second far-field target image, and the near-field target image comprises a first near-field target image and a second near-field target image;
determining first far-field target image data according to the image characteristics of the first far-field target image, and determining second far-field target image data according to the image characteristics of the second far-field target image;
determining a first near-field target amplitude distribution according to the image characteristics of the first near-field target image, and determining a second near-field target amplitude distribution according to the image characteristics of the second near-field target image;
optimizing by utilizing an optimization algorithm and a target amplitude phase relation according to the first far-field target image data, the second far-field target image data, the first near-field target amplitude distribution and the second near-field target amplitude distribution to obtain optimized first far-field target phase distribution and second far-field target phase distribution and first near-field target amplitude distribution and second near-field target amplitude distribution;
screening a plurality of candidate micro-nano structures according to the first far-field target phase distribution and the second far-field target phase distribution to obtain target micro-nano structures;
arranging a plurality of target micro-nano structures to form the optical encryption structure;
the first far-field target image comprises an image with a polarization state along the horizontal direction, wherein the image is obtained by transmitting an optical signal output by a light source through the optical encryption structure; and/or
The second far-field target image comprises an image of a polarization state along the vertical direction, which is obtained by transmitting the optical signal output by the light source through the optical encryption structure; and/or
The first near-field target image comprises an image with a polarization state 45 degrees with the vertical direction, wherein the image is obtained by transmitting an optical signal output by a light source through the optical encryption structure; and/or
The second near-field target image comprises an image with a polarization state of-45 degrees relative to the vertical direction, wherein the image is obtained by transmitting an optical signal output by a light source through the optical encryption structure;
the target amplitude phase relationship includes the following relationship:
wherein,for said first far-field target phase distribution, < > j >>For the second far-field target phase distribution, E 1 For the first near field target amplitude profile; and/or
The target amplitude phase relationship includes the following relationship:
wherein,for said first far-field target phase distribution, < > j >>For the second far-field target phase distribution, E 2 For the second near field target amplitude profile.
2. The design method according to claim 1, wherein the screening the candidate micro-nano structures according to the first far-field target phase distribution and the second far-field target phase distribution to obtain the target micro-nano structure includes:
determining the horizontal phase distribution and the vertical phase distribution of the candidate micro-nano structure according to the parameter information of the candidate micro-nano structure;
and screening the candidate micro-nano structure with the horizontal phase distribution equal to the first far-field target phase distribution and the vertical phase distribution equal to the second far-field target phase distribution as the target micro-nano structure.
3. The design method according to claim 1, characterized in that the design method further comprises:
acquiring a first far-field image, a second far-field image, a first near-field image and a second near-field image which are obtained by transmitting an optical signal output by a light source through the optical encryption structure;
and if the first far-field image is inconsistent with the first far-field target image and/or the second far-field image is inconsistent with the second far-field target image and/or the first near-field image is inconsistent with the first near-field target image and/or the second near-field image is inconsistent with the second near-field target image, screening a plurality of candidate micro-nano structures again according to the first far-field target phase distribution and the second far-field target phase distribution, and obtaining the target micro-nano structure.
4. A design method according to claim 1 or 3, wherein the light signal output by the light source comprises linearly polarized light having a polarization state of 45 ° with respect to the horizontal direction.
5. A near-far field multi-polarization optical encryption system, comprising:
a light source for outputting an optical signal;
the imaging component is positioned on the light path of the optical signal output by the light source; and
The optical encryption structure obtained by the design method according to any one of claims 1 to 4, the optical encryption structure being disposed between the light source and the imaging component, the optical encryption structure being configured to receive the optical signal, transmit at least a portion of the optical signal to the imaging component, and the imaging component being configured to form a first far-field target image, a second far-field target image, a first near-field target image, and a second near-field target image, wherein the first far-field target image, the second far-field target image, the first near-field target image, and the second near-field target image are each an image of the optical signal after decryption.
6. The near-far field multi-polarization state optical encryption system of claim 5, wherein the imaging assembly includes a polarization analyzer, a first imaging plane and a second imaging plane, the polarization analyzer being disposed between the optical encryption structure and the imaging assembly, the first imaging plane being disposed away from the optical encryption structure relative to the second imaging plane, the polarization analyzer being configured to pass the optical signals in a particular direction, the first imaging plane being configured to form the first far field target image and the second far field target image, the second imaging plane being configured to form the first near field target image and the second near field target image.
7. The near-far field multi-polarization state optical encryption system of claim 6, wherein the polarization analyzer is configured to pass the optical signal with a polarization state in a horizontal direction; and/or
The polarization-detecting device is used for enabling the light signals with polarization states in the vertical direction to pass through; and/or
The polarization-detecting device is used for enabling the optical signals with the polarization state and the vertical direction in the 45-degree direction to pass through; and/or
The polarization-detecting device is used for enabling the light signals with the polarization state in the direction of-45 degrees to pass through.
8. The near-far field multi-polarization optical encryption system of claim 5, wherein the light source comprises means for outputting linearly polarized light having a polarization state of 45 ° from horizontal.
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