Metasurface device design method based on logic optical operation and imaging device

Abstract

The invention discloses a metasurface device design method based on logic optical operation and an imaging device, and the method comprises the steps: receiving input initial parameter information, and setting a grating period corresponding to the initial parameter information according to a preset period setting rule; overlapping the grating period according to a preset grating overlapping function and the initial parameter information to obtain corresponding amplitude distribution information; performing matching mapping on the amplitude distribution information according to a preset transmittance distribution table to obtain size arrangement information of the microstructure; and setting the overall structure size according to the size information and the size arrangement information in the initial parameter information to obtain corresponding metasurface device design information. According to the method, the metasurface device design information is obtained, the metasurface device is obtained through design, the designed metasurface device is applied to the imaging device, optical logic operation is carried out on the incident image, the imaging image is accurately obtained, and the efficiency of carrying out optical logic operation on the image is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of metasurface device control technology, and in particular to a metasurface device design method and imaging device based on logic optical operations. Background Technology

[0002] Optical computing, with its advantages of real-time operation, parallel processing capabilities, and low power consumption, is gradually leading the innovation of information processing networks. In recent years, with the increasing demand for the integration and miniaturization of optical systems, the application of nanophotonics in optical computing has received widespread attention. As a key component in this field, metasurfaces, with their two-dimensional artificial periodic structures, have become an ideal alternative to traditional optical components. Thanks to their subwavelength-scale unit structure, high degree of design freedom, and unique electromagnetic resonance characteristics, metasurfaces can achieve high-resolution and high-precision control of light fields, providing strong support for building compact, multifunctional integrated devices and powerfully promoting the development of optical networks and chip technology.

[0003] Building upon this foundation, the optical computing capabilities based on metasurfaces have been continuously expanded, with integration, differentiation, convolution, and other mathematical operations being successively realized. Leveraging their superior light field manipulation capabilities, metasurfaces can efficiently perform optical image processing tasks, including edge detection, pattern recognition, and even equation solving. Besides arithmetic operations, logical operations, as core operations in information processing, are also highly valued in the field of micro-nano optics, and various miniature optical logic processors have been proposed. In image processing, two-dimensional logical operations provide an effective way to understand visual content by revealing hidden information and enhancing image readability. Among various logical operations, the "AND" and "XOR" operations are particularly important because they can extract common features and differentiating components from images, playing a crucial role in image analysis and recognition.

[0004] However, current image-based logic operation methods all involve image processing in a terminal processor after image capture, and cannot efficiently obtain the logic operation results directly from the image through optical imaging methods. Therefore, existing technologies suffer from the problem of inefficiently performing optical logic operations on images. Summary of the Invention

[0005] This invention provides a metasurface device design method and imaging device based on logical optical operations, aiming to solve the problem that existing methods cannot efficiently perform optical logical operations on images.

[0006] In a first aspect, embodiments of the present invention provide a metasurface device design method based on logic optical operations, wherein the method includes: Receive the input initial parameter information and set the grating period corresponding to the initial parameter information according to the preset period setting rules; The grating period is superimposed according to the preset grating superposition function and initial parameter information to obtain the corresponding amplitude distribution information; The amplitude distribution information is matched and mapped according to a preset transmittance distribution table to obtain the size arrangement information of the microstructure. Based on the size information and size arrangement information in the initial parameter information, the overall structural size is set to obtain the corresponding metasurface device design information.

[0007] Secondly, embodiments of the present invention also provide an imaging device, wherein the imaging device includes a first lens, a metasurface device, and a second lens; The axial distances between the two incident images and the first lens, the axial distances between the first lens and the metasurface device, and the axial distances between the metasurface device and the second lens are all equal to the focal length of the first lens; the two incident images have a preset distance on the focal plane of the first lens; the first imaging image and the second imaging image are obtained on the focal plane of the second lens on the side away from the metasurface device; The microstructures in the metasurface devices are designed using the metasurface device design method based on logic optical operations as described in the first aspect above.

[0008] Thirdly, embodiments of the present invention also provide a computer device, wherein the device includes a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus; Memory, used to store computer programs; When a processor executes a program stored in memory, it implements the steps of the metasurface device design method based on logical optical operations described in the first aspect above.

[0009] Fourthly, embodiments of the present invention also provide a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the metasurface device design method based on logical optical operations as described in the first aspect above.

[0010] This invention provides a metasurface device design method and imaging device based on logical optical operations. The method includes: receiving input initial parameter information; setting a grating period corresponding to the initial parameter information according to a preset period setting rule; superimposing the grating period according to a preset grating superposition function and the initial parameter information to obtain corresponding amplitude distribution information; matching and mapping the amplitude distribution information according to a preset transmittance distribution table to obtain microstructure size arrangement information; and setting the overall structural size according to the size information in the initial parameter information and the size arrangement information to obtain corresponding metasurface device design information. This method obtains metasurface device design information and designs a metasurface device, then applies the designed metasurface device to an imaging device, thereby enabling optical logical operations on the incident image and accurate acquisition of the image, significantly improving the efficiency of optical logical operations on the image. Attached Figure Description

[0011] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 A flowchart of a metasurface device design method based on logic optics operations provided in an embodiment of the present invention; Figure 2 A schematic diagram illustrating the application effect of the metasurface device design method based on logic optics provided in this embodiment of the invention; Figure 3 This is a schematic diagram of the metasurface microstructure provided in an embodiment of the present invention; Figure 4 A structural diagram of the imaging apparatus provided in an embodiment of the present invention; Figure 5 This is a schematic diagram illustrating the application effect of the imaging device provided in an embodiment of the present invention; Figure 6 A schematic block diagram of a control terminal provided in an embodiment of the present invention; Figure 7 This is a schematic block diagram of a computer device provided in an embodiment of the present invention. Detailed Implementation

[0013] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0014] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0015] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0016] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0017] Please see Figure 1 As shown in the figure, an embodiment of this invention provides a metasurface device design method based on logic optical operations. This method is applied in a control terminal and is executed by application software installed in the control terminal. The control terminal can be a terminal device with data processing and command transmission / reception functions, such as a laptop, desktop computer, tablet computer, or mobile phone. Figure 1 As shown, the method includes steps S110 to S140.

[0018] S110. Receive the input initial parameter information and set the grating period corresponding to the initial parameter information according to the preset period setting rules.

[0019] Users can input initial parameter information, which includes the initial parameters of the imaging system being used. This initial parameter information includes the first wavelength, the second wavelength, the lens focal length (the focal lengths of the first and second lenses are equal), the phase difference, the preset image distance, and the image size. After obtaining the initial parameter information, the corresponding grating period can be set according to the preset period setting rules.

[0020] In a specific embodiment, step S110 includes the following sub-steps: setting a first grating period corresponding to the first wavelength in the initial parameter information according to the setting function in the period setting rule; obtaining the ratio of the first wavelength to the second wavelength in the initial parameter information; multiplying the ratio by the first grating period to obtain a second grating period corresponding to the second wavelength; and combining the first grating period and the second grating period to obtain a grating period corresponding to the initial parameter information.

[0021] Specifically, the period setting rule includes a setting function, which can be used to set the first grating period corresponding to the first wavelength in the initial parameter information. The specific setting function can be expressed by formula (1): (1); Where d is half of the preset image distance (i.e., the preset image distance is 2d), λ1 is the first wavelength, Λ1 is the first grating period, and f FL Let be the focal length of the lens. Then, the first grating period Λ1 can be calculated using the above-mentioned set function.

[0022] Furthermore, the ratio between the first wavelength λ1 and the second wavelength λ2 in the initial parameter information is obtained. Since the ratio of the first grating period to the second grating period is inversely proportional to the ratio of the first wavelength to the second wavelength, the ratio of the first wavelength to the second wavelength can be multiplied by the first grating period to obtain the second grating period.

[0023] The obtained first grating period is combined with the second grating period to obtain the grating period corresponding to the initial parameter information; the grating period then contains the first grating period and the second grating period.

[0024] S120. The grating period is superimposed according to the preset grating superposition function and initial parameter information to obtain the corresponding amplitude distribution information.

[0025] The grating periods are further superimposed based on the grating superposition function and initial parameter information to obtain amplitude distribution information. Specifically, the amplitude distribution information includes a first amplitude distribution corresponding to the first grating period and a second amplitude distribution corresponding to the second grating period.

[0026] In a specific embodiment, step S120 includes the following sub-steps: calculating a second amplitude distribution corresponding to the second grating period in the grating period according to the grating superposition function; calculating a first amplitude distribution corresponding to the first grating period in the grating period and the phase difference in the initial parameter information according to the grating superposition function; and superimposing the first amplitude distribution and the second amplitude distribution to obtain the corresponding amplitude distribution information.

[0027] Specifically, based on the calculation of the second amplitude distribution corresponding to the second grating in the grating period according to the grating superposition function, the grating superposition function can be expressed by formula (2): (2); Where H2(x1,y1) represents the second amplitude distribution, and π is the mathematical constant pi. x 1, y 1 represents the coordinates of the spectral surface.

[0028] Since there is a phase difference between the two phases corresponding to the first grating period and the second grating period, the first amplitude distribution corresponding to the first grating period and the phase difference can be further calculated based on the grating superposition function. The specific calculation formula can be expressed by formula (3): (3); Where H1(x1,y1) is the first amplitude distribution. Δθ is the phase difference, which can usually be set to π / 2.

[0029] To perform optical logic operations on the image, two sinusoidal amplitude modulation gratings with a phase difference of π / 2 in the spectral plane of the metasurface can be superimposed. The specific expression can be represented by formula (4): (4); The resulting H(x1,y1) represents the amplitude distribution information.

[0030] S130. Match and map the amplitude distribution information according to the preset transmittance distribution table to obtain the size arrangement information of the microstructure.

[0031] Furthermore, a transmittance distribution table can be pre-set, which is obtained by scanning microstructures of different sizes. For example, in this embodiment, microstructures with diameters ranging from 80 nm to 270 nm are scanned at two wavelengths: a first wavelength λ1 = 632 nm and a second wavelength λ2 = 531 nm. The transmittance of the microstructures at different wavelengths is obtained as follows: Figure 2 As shown in the table, the amplitude distribution information can be matched and mapped to obtain the size arrangement information of the microstructure.

[0032] In a specific embodiment, step S130 includes the following sub-steps: calculating the target transmittance corresponding to each position based on the amplitude distribution information; matching and mapping the target transmittance at each position according to the transmittance distribution table to obtain the target size corresponding to each position; and integrating the target sizes at each position to obtain the size arrangement information.

[0033] Specifically, the target transmittance at each location is calculated based on the amplitude distribution information. Since multiple microstructures need to be set in the metasurface device, one microstructure is set at each location on the plane corresponding to the metasurface device. The target transmittance at each location can then be calculated.

[0034] The target transmittance at each location is matched against the transmittance distribution table to obtain the size that matches the target transmittance at each location. Thus, a target size can be obtained for each location through matching and mapping. The target sizes at each location are then integrated, that is, the target sizes are organized according to the coordinates of different locations to obtain the size arrangement information. The size arrangement information includes the target size corresponding to the microstructure at each location.

[0035] In a specific embodiment, the step of calculating the target transmittance corresponding to each position based on the amplitude distribution information includes: calculating the first transmittance corresponding to each position based on the first amplitude distribution in the amplitude distribution information; calculating the second transmittance corresponding to each position based on the second amplitude distribution in the amplitude distribution information; and combining the first transmittance and the second transmittance at the same position to form the target transmittance.

[0036] The first transmittance at each location can be calculated based on the first amplitude distribution in the amplitude distribution information. Since both the first and second amplitude distributions in the amplitude distribution information correspond to the amplitude distributions of the spectral plane in the metasurface, the amplitude at each location in the first amplitude distribution can be obtained and its squared value calculated. The squared value of the amplitude at a location is the first transmittance at that location, which is also the target transmittance of the microstructure corresponding to that location in the metasurface. Similarly, the second transmittance at each location can be calculated using the second amplitude distribution. The first transmittance corresponding to the first wavelength and the second transmittance corresponding to the second wavelength can be obtained at the same location in the metasurface. By combining the first and second transmittances corresponding to each location, the target transmittance can be obtained.

[0037] In a specific embodiment, the step of matching and mapping the target transmittance at each location according to the transmittance distribution table to obtain the target size corresponding to each location includes: obtaining the first amplitude response difference between the transmittance corresponding to the first wavelength in the transmittance distribution table and the first transmittance in the target transmittance at each location, respectively, for each size; obtaining the second amplitude response difference between the transmittance corresponding to the second wavelength in the transmittance distribution table and the second transmittance in the target transmittance at each location, respectively, for each size; and selecting the size at each location with the minimum total response error according to the filtering function set in the transmittance distribution table and the first amplitude response difference and the second amplitude response difference, and setting it as the corresponding target size.

[0038] The transmittance distribution table contains the transmittance of microstructures of different sizes (diameter l) at different wavelengths. Matching and mapping can be performed using the transmittance distribution table to obtain the difference in the first amplitude response at each size between the first transmittance at the first wavelength and the target transmittance at each location. Based on the transmittance distribution table, the difference in the first amplitude response at each size between the first transmittance at the first wavelength and a certain location can be obtained. Similarly, the difference in the first amplitude response at each size at each location can be obtained.

[0039] Similarly, by matching and mapping according to the transmittance distribution table, the difference in the second amplitude response between the second wavelength and the target transmittance at each position at each size can be obtained.

[0040] Based on the filtering function set in the transmittance distribution table, and the first amplitude response difference and the second amplitude response difference obtained in the above steps, the target size corresponding to each position can be filtered out. The filtering function can be expressed by formula (5): (5); Wherein, FOM is the total response error obtained from the screening function, A λ1 real A represents the transmittance of a microstructure of a certain size at the first wavelength in the transmittance distribution table. λ1 design Let A be the first transmittance at a certain position in the target transmittance. λ2 real For the microstructures of the same size at the second wavelength in the transmittance distribution table (with A) λ1 real Transmittance of microstructures of the same size (A) λ2 design The second transmittance is the same position in the target transmittance (the same position as the first transmittance).

[0041] It can determine the size of a microstructure at a certain location when the FOM (Total Response Error) is minimized under different values, and this size can be set as the target size for that location.

[0042] S140. Based on the size information and size arrangement information in the initial parameter information, the overall structural size is set to obtain the corresponding metasurface device design information.

[0043] The size arrangement information only includes the diameter *l* of each microstructure. To obtain complete size information for each microstructure in the metasurface device, the size information in the initial parameter information can be combined to obtain the metasurface device design information. The initial parameter settings also include size information, which specifies the thickness and period of the microstructure; the combined structure of a microstructure and its underlying base is as follows: Figure 3As shown. The microstructure is cylindrical, with its axis perpendicular to the surface of the base below. The base below the microstructure is square, and the side length of this square is equal to the period in the dimensional information; for example, the period p can be set to 350 nm. The thickness of the microstructure is also... Figure 3 In the 'h' parameter, the microstructure thickness 'h' can be set to 700 nm. Based on the size information and microstructure size arrangement information, the overall structural dimensions are set, thereby obtaining the corresponding metasurface device design information. This metasurface device design information includes the complete size design information of each microstructure within the metasurface device.

[0044] In a specific embodiment, step S140 includes the following sub-steps: setting the basic dimensions of each microstructure according to the size information; setting the overall structural dimensions of each microstructure and the size arrangement information to obtain the corresponding metasurface device design information.

[0045] Based on the size information, the basic dimensions of each microstructure are set. The side length of the square corresponding to the base of each microstructure is set, and the thickness of the microstructure is also set to determine the basic dimensions of each microstructure. At this point, the basic dimensions of each microstructure are the same. The overall structural dimensions are then set by combining the basic dimensions of the microstructures with the target dimensions of each microstructure in the size arrangement information. That is, the diameter of each microstructure is further set based on the basic dimensions. The diameters of each microstructure are not equal. After completing the overall size setting, the metasurface device design information is obtained. Based on this metasurface device design information, the corresponding metasurface device that meets the actual application requirements can be fabricated.

[0046] The metasurface device design method and imaging device based on logical optical operations disclosed in the above embodiments include: receiving input initial parameter information; setting a grating period corresponding to the initial parameter information according to a preset period setting rule; superimposing the grating period according to a preset grating superposition function and the initial parameter information to obtain corresponding amplitude distribution information; matching and mapping the amplitude distribution information according to a preset transmittance distribution table to obtain the size arrangement information of the microstructure; and setting the overall structural size according to the size information in the initial parameter information and the size arrangement information to obtain the corresponding metasurface device design information. This method obtains metasurface device design information and designs a metasurface device, then applies the designed metasurface device to an imaging device, thereby realizing optical logical operations on the incident image and accurately acquiring the image, thus significantly improving the efficiency of optical logical operations on the image.

[0047] This invention also provides an imaging device, such as... Figure 3 and Figure 4As shown, the imaging device includes a first lens 1, a metasurface device 2, and a second lens 3. The axial distances between the two incident images and the first lens 1, the axial distances between the first lens 1 and the metasurface device 2, and the axial distances between the metasurface device 2 and the second lens 3 are all equal to the focal length of the first lens 1. The two incident images have a preset distance on the focal plane of the first lens 1. A first imaging image and a second imaging image are obtained on the focal plane of the second lens 3 on the side away from the metasurface device 2. The microstructure in the metasurface device 2 is designed using the metasurface device design method based on logical optical operations as described in the above embodiments.

[0048] In a more specific embodiment, the metasurface device 2 comprises a substrate layer 21 and microstructures 22, with one side of the microstructures facing the second lens. Specifically, the microstructures are arranged periodically and regularly on the substrate, and the shapes of the microstructures are nanopillars or nanopores.

[0049] Specifically, the aforementioned imaging devices are applicable to multiple wavelength bands, including ultraviolet, visible, near-infrared, and mid-infrared. The substrate material in the metasurface device is transparent to the designed wavelength band; for example, in the visible or near-infrared band, the substrate material can be PMMA, silicon dioxide, silicon nitride, etc.; in the mid-infrared band, the material can be fluoride glass, chalcogenide glass, germanium-silicon glass, etc. The microstructure material in the metasurface device can be amorphous silicon, polycrystalline silicon, silicon nitride, titanium dioxide, gallium nitride, chalcogenides, etc. The microstructures are arranged periodically (e.g., tetragonal, hexagonal, etc.) on the substrate, and the specific shapes of the microstructures include, but are not limited to, nanocylinders, nanocross pillars, nanopores, nanocross holes, and microstructures with specific shapes obtained through optimization.

[0050] If the intensities of the two incident images are respectively E a and E b Given a preset distance of 2d, the summation intensity of the images can be expressed as: ; If based on wavelength λ 1 represents the detection wavelength. These two images, after undergoing Fourier transform through the first lens, reach the metasurface. After metasurface modulation, their spatial spectrum can be written as: ; F a and F b They are respectively E a and E bThe Fourier transform of the image, where u is the spatial frequency in the x-direction, will yield an inverse Fourier transform at the focal plane after passing through the second lens. The result is as follows: ; As can be seen from the above formula, (0,0) is... E a and E b The destructive interference will eventually reveal the same features in both images.

[0051] If based on wavelength λ 2 represents the detection wavelength. After Fourier transform and metasurface modulation of these two images using the first lens, their spatial spectrum can be written as: ; After passing through the second lens, an inverse Fourier transform result will be obtained at the focal plane, as follows: ; As can be seen from the above formula, (0,0) is... E a and E b The constructive interference will eventually reveal the different features of the two images. The above provides a derivation and analysis of the imaging device's implementation process from a physical perspective.

[0052] In a specific embodiment, two incident images can be illuminated by lasers with wavelengths λ1=632nm and λ2=531nm, and then incident on a first lens (the first and second lenses form a 4f system) at a distance of 2d=4mm apart. The focal length of the first lens is 63.2mm. The beam is focused onto the metasurface, modulated by amplitude, and propagates for 63.2mm before illuminating the second lens. After another focal length, it propagates to the receiving surface (which is also the focal plane of the second lens). If the receiving surface is filtered with a 632nm wavelength, the overlapping portion of the two images will be received, i.e., an AND operation will be performed. If the receiving surface is filtered with a 531nm wavelength, the difference portion of the two images will be received, i.e., an XOR operation will be performed. The specific application effect is as follows: Figure 4 As shown.

[0053] The specific working principle of the imaging device in this embodiment is as follows: Figure 5 As shown, Figure 5 The original images of the two incident images and the first and second imaging images obtained after processing are given. It can be seen that when the detection wavelength is 632nm, the first imaging image is the overlapping part of the triangle and the square; when the detection wavelength is 531nm, the imaging image is the difference part of the two incident images.

[0054] like Figure 6 As shown, this embodiment of the invention also provides a metasurface device design apparatus 100 based on logic optical operations. The apparatus includes the following units configured in a control terminal: a grating period acquisition unit 110, used to receive input initial parameter information and set a grating period corresponding to the initial parameter information according to a preset period setting rule; an amplitude distribution information acquisition unit 120, used to superimpose the grating period according to a preset grating superposition function and the initial parameter information to obtain corresponding amplitude distribution information; a matching mapping unit 130, used to match and map the amplitude distribution information according to a preset transmittance distribution table to obtain the microstructure size arrangement information; and a design information acquisition unit 140, used to set the overall structural dimensions according to the size information in the initial parameter information and the size arrangement information to obtain corresponding metasurface device design information.

[0055] The metasurface device design apparatus based on logic optical operations provided in this embodiment of the invention applies the above-mentioned metasurface device design method based on logic optical operations. It receives input initial parameter information, sets a grating period corresponding to the initial parameter information according to a preset period setting rule, superimposes the grating period according to a preset grating superposition function and the initial parameter information to obtain corresponding amplitude distribution information, matches and maps the amplitude distribution information according to a preset transmittance distribution table to obtain the microstructure size arrangement information, and sets the overall structural size according to the size information in the initial parameter information and the size arrangement information to obtain the corresponding metasurface device design information. This method obtains metasurface device design information and designs a metasurface device. The designed metasurface device is then applied to an imaging device, thereby enabling optical logic operations on the incident image and accurate acquisition of the image, significantly improving the efficiency of optical logic operations on images.

[0056] The aforementioned metasurface device design apparatus based on logic optical operations can be implemented as a computer program, which can be used in, for example... Figure 7 It runs on the computer device shown.

[0057] Please see Figure 7 , Figure 7 This is a schematic block diagram of a computer device provided in an embodiment of the present invention. The computer device can be a control terminal used to execute a metasurface device design method based on logical optical operations to obtain corresponding metasurface device design information according to requirements.

[0058] See Figure 7 The computer device 500 includes a processor 502, a memory, and a communication interface 505 connected via a communication bus 501. The memory may include a storage medium 503 and internal memory 504.

[0059] The storage medium 503 may store an operating system 5031 and a computer program 5032. When the computer program 5032 is executed, it enables the processor 502 to execute a metasurface device design method based on logic optical operations. The storage medium 503 may be a volatile storage medium or a non-volatile storage medium.

[0060] The processor 502 provides computing and control capabilities to support the operation of the entire computer device 500.

[0061] The internal memory 504 provides an environment for the computer program 5032 in the storage medium 503 to run. When the computer program 5032 is executed by the processor 502, the processor 502 can execute a metasurface device design method based on logic optical operations.

[0062] This communication interface 505 is used for network communication, such as providing data transmission. Those skilled in the art will understand that... Figure 7 The structure shown is merely a block diagram of a portion of the structure related to the present invention and does not constitute a limitation on the computer device 500 to which the present invention is applied. The specific computer device 500 may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements.

[0063] The processor 502 is used to run the computer program 5032 stored in the memory to implement the corresponding functions in the above-mentioned metasurface device design method based on logical optical operations.

[0064] Those skilled in the art will understand that Figure 7 The embodiments of the computer device shown do not constitute a limitation on the specific configuration of the computer device. In other embodiments, the computer device may include more or fewer components than shown, or combine certain components, or have different component arrangements. For example, in some embodiments, the computer device may include only memory and a processor. In such embodiments, the structure and function of the memory and processor are different from those shown. Figure 7 The embodiments shown are consistent and will not be described again here.

[0065] It should be understood that, in this embodiment of the invention, the processor 502 may be a Central Processing Unit (CPU), or it may be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor.

[0066] In another embodiment of the invention, a computer-readable storage medium is provided. This computer-readable storage medium may be volatile or non-volatile. The computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps included in the above-described metasurface device design method based on logic optics operations.

[0067] Those skilled in the art will readily understand that, for the sake of convenience and brevity, the specific working processes of the devices, apparatuses, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this invention.

[0068] In the embodiments provided by this invention, it should be understood that the disclosed devices, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Units with the same function may be grouped into one unit. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interfaces, devices, or units, or it may be an electrical, mechanical, or other form of connection.

[0069] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of the embodiments of the present invention, depending on actual needs.

[0070] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0071] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a computer-readable storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned computer-readable storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), magnetic disks, or optical disks.

[0072] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for designing a metasurface device based on logical optical operation, characterized in that, The method comprises: receiving input initial parameter information, setting a grating period corresponding to the initial parameter information according to a preset period setting rule; superimposing the grating period according to a preset grating superposition function and initial parameter information to obtain corresponding amplitude distribution information; matching and mapping the amplitude distribution information according to a preset transmittance distribution table to obtain size arrangement information of a microstructure; setting overall structure size according to size information in the initial parameter information and the size arrangement information to obtain corresponding metasurface device design information.

2. The metasurface device design method based on logical optical operation according to claim 1, wherein, The setting of the grating period corresponding to the initial parameter information according to the preset period setting rule comprises: setting a first grating period corresponding to a first wavelength in the initial parameter information according to a setting function in the period setting rule; obtaining a ratio of the first wavelength to a second wavelength in the initial parameter information; multiplying the ratio by the first grating period to obtain a second grating period corresponding to the second wavelength; combining the first grating period and the second grating period to obtain the grating period corresponding to the initial parameter information.

3. The design method of a metasurface device based on a logic optical operation according to claim 1, wherein, The superimposition of the grating period according to the preset grating superposition function and the initial parameter information to obtain the corresponding amplitude distribution information comprises: calculating a second amplitude distribution corresponding to a second grating period in the grating period according to the grating superposition function; calculating a first amplitude distribution corresponding to a first grating period in the grating period and a phase difference in the initial parameter information according to the grating superposition function; superimposing the first amplitude distribution and the second amplitude distribution to obtain the corresponding amplitude distribution information.

4. The design method of a metasurface device based on a logic optical operation according to claim 1, wherein, The matching and mapping of the amplitude distribution information according to the preset transmittance distribution table to obtain the size arrangement information of the microstructure comprises: calculating a target transmittance corresponding to each position according to the amplitude distribution information; matching and mapping the target transmittance of each position according to the transmittance distribution table to obtain a target size corresponding to each position; integrating the target size of each position to obtain the size arrangement information.

5. The design method of a metasurface device based on a logic optical operation according to claim 4, wherein, The calculation of the target transmittance corresponding to each position according to the amplitude distribution information comprises: calculating a first transmittance corresponding to each position according to a first amplitude distribution in the amplitude distribution information; calculating a second transmittance corresponding to each position according to a second amplitude distribution in the amplitude distribution information; combining the first transmittance and the second transmittance of the same position into the target transmittance.

6. The metasurface device design method based on logical optical operation according to claim 5, wherein, The matching and mapping of the target transmittance of each position according to the transmittance distribution table to obtain the target size corresponding to each position comprises: obtaining a first transmittance in the target transmittance of each position and a transmittance corresponding to a first wavelength in the transmittance distribution table, which are respectively corresponding to a first amplitude response difference of each size; obtaining a second transmittance in the target transmittance of each position and a transmittance corresponding to a second wavelength in the transmittance distribution table, which are respectively corresponding to a second amplitude response difference of each size; According to the screening function set in the transmittance distribution table and the first amplitude response difference and the second amplitude response difference, the size of each position when the total response error is the smallest is screened out and set as the corresponding target size.

7. The design method of a metasurface device based on a logic optical operation according to any one of claims 4-6, characterized in that, The overall structure size setting according to the size information in the initial parameter information and the size arrangement information obtains corresponding metasurface device design information, including: The basic size of each microstructure is set according to the size information; The overall structure size setting of the basic size of each microstructure and the size arrangement information obtains corresponding metasurface device design information.

8. An image forming apparatus characterized by comprising: The imaging device includes a first lens, a metasurface device and a second lens; The axial distance between the two incident images and the first lens, the axial distance between the first lens and the metasurface device, and the axial distance between the metasurface device and the second lens are equal to the focal length of the first lens; The two incident images have a preset distance on the focal plane of the first lens; the second lens obtains a first imaging image and a second imaging image on the focal plane away from the metasurface device; The microstructure in the metasurface device is designed by the metasurface device design method based on logical optical operation according to any one of claims 1-7.

9. The imaging apparatus according to claim 8, wherein The metasurface device is composed of a substrate layer and a microstructure, and one side of the microstructure is arranged to face the second lens.

10. The imaging apparatus according to claim 9, wherein The microstructure is periodically and regularly arranged on the substrate, and the shape of the microstructure is a nanocolumn or a nanopore.

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