Metasurface device design method based on logical optical operation and imaging apparatus

Abstract

The application discloses a kind of based on logic optical operation's super surface device design method and imaging device, method includes: receiving the initial parameter information input, according to the preset period setting rule, the grating period corresponding to initial parameter information is set;According to the preset grating superposition function and initial parameter information, grating period is superimposed, corresponding amplitude distribution information is obtained;According to the preset transmittance distribution table, amplitude distribution information is mapped, to obtain the size arrangement information of microstructure;According to the size information in initial parameter information and size arrangement information, overall structure size setting is carried out, corresponding super surface device design information is obtained.The above method, obtains super surface device design information and designs to obtain super surface device, and the super surface device designed is applied to imaging device, so as to realize optical logic operation to incident image and accurately obtain imaging image, so as to greatly improve the efficiency of optical logic operation to image.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metasurface device regulation, and particularly relates to a metasurface device design method based on logical optical operation and an imaging device. BACKGROUND

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

[0003] On this basis, the optical computing functions based on metasurfaces continue to expand, and integration, differentiation, convolution and other mathematical operations have been realized. Relying on its excellent light field regulation capability, metasurfaces can efficiently perform optical image processing tasks, including edge detection, pattern recognition and even equation solving. In addition to arithmetic operations, logical operations, as a core operation in information processing, are also valued in the field of micro-nano optics, and various micro-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 "exclusive or" operations are particularly important, as they can extract common features and difference components in images, respectively, and play a key role in image analysis and recognition.

[0004] However, the current image-based logical operation method is performed by shooting images and processing images in a terminal processor, and cannot efficiently obtain the logical operation result of the image directly through optical imaging method. Therefore, there is a problem of being unable to efficiently perform optical logical operation on images in the prior art. SUMMARY

[0005] Embodiments of the present application provide a metasurface device design method based on logical optical operation and an imaging device, aiming to solve the problem of being unable to efficiently perform optical logical operation on images in the prior art method.

[0006] In a first aspect, embodiments of the present application provide a metasurface device design method based on logical optical operation, wherein the method comprises:

[0007] receive the inputted initial parameter information, set a grating period corresponding to the initial parameter information according to a preset period setting rule;

[0008] superimpose the grating period according to a preset grating superposition function and the initial parameter information to obtain corresponding amplitude distribution information;

[0009] match and map the amplitude distribution information according to a preset transmittance distribution table to obtain size arrangement information of the microstructure;

[0010] set an overall structure size according to size information in the initial parameter information and the size arrangement information to obtain corresponding metasurface device design information.

[0011] In a second aspect, the embodiment of the present application further provides an imaging device, wherein the imaging device comprises a first lens, a metasurface device and a second lens;

[0012] 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 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 second lens obtains a first imaging image and a second imaging image on the focal plane away from the metasurface device;

[0013] The microstructure in the metasurface device is designed by using the metasurface device design method based on logical optical operation as described in the first aspect.

[0014] In a third aspect, the embodiment of the present application further provides a computer device, wherein the device comprises a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory complete mutual communication through the communication bus;

[0015] The memory is used to store a computer program.

[0016] The processor is used to execute the program stored on the memory to realize the steps of the metasurface device design method based on logical optical operation as described in the first aspect.

[0017] In a fourth aspect, the embodiment of the present application further provides a computer readable storage medium, which stores a computer program, wherein the computer program is executed by the processor to realize the steps of the metasurface device design method based on logical optical operation as described in the first aspect.

[0018] The embodiment of the present application provides a metasurface device design method based on logical optical operation and an imaging device, the method comprises the following steps: 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 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. The above method obtains metasurface device design information and designs a metasurface device, and applies the designed metasurface device to an imaging device, so that optical logical operation on an incident image is realized, and an imaging image is accurately obtained, and therefore the efficiency of optical logical operation on the image is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0020] Figure 1 The method flow chart of the metasurface device design method based on logical optical operation provided by the embodiment of the present application is provided.

[0021] Figure 2 The application effect schematic diagram of the metasurface device design method based on logical optical operation provided by the embodiment of the present application is provided.

[0022] Figure 3 The structure schematic diagram of the metasurface microstructure provided by the embodiment of the present application is provided.

[0023] Figure 4 The device structure diagram of the imaging device provided by the embodiment of the present application is provided.

[0024] Figure 5 The application effect schematic diagram of the imaging device provided by the embodiment of the present application is provided.

[0025] Figure 6 The schematic block diagram of the control terminal provided by the embodiment of the present application is provided.

[0026] Figure 7 The schematic block diagram of the computer equipment provided by the embodiment of the present application is provided. DETAILED DESCRIPTION

[0027] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative effort are within the scope of the present application.

[0028] It should be understood that the terms "comprising" and "including" as used in the specification and the appended claims indicate the presence of the described features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0029] It should also be understood that the terms used in the present application specification are only for the purpose of describing particular embodiments and are not intended to limit the present application. As used in the present application 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.

[0030] It should be further understood that the term "and / or" as used in the present application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations thereof, and includes these combinations.

[0031] Please refer to Figure 1 As shown in the figure, the embodiment of the present application provides a metasurface device design method based on logical optical operation, which is applied to a control terminal, and the method is executed by application software installed in the control terminal. The control terminal can be a terminal device with data processing and instruction transceiving functions, such as a notebook computer, a desktop computer, a tablet computer, or a mobile phone. As shown in the figure, the method comprises steps S110-S140. Figure 1

[0032] S110, receiving the input initial parameter information, and setting the grating period corresponding to the initial parameter information according to the preset period setting rule.

[0033] The user can input the initial parameter information, and the initial parameter information contains the initial parameters of the applied imaging system. The initial parameter information includes the first wavelength, the second wavelength, the lens focal length (the focal lengths of the first lens and the second lens are equal), the phase difference, the image preset distance, and the size information. After obtaining the initial parameter information, the corresponding grating period can be set according to the pre-set period setting rule.

[0034] ​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.

[0035] 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):

[0036] (1);

[0037] 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.

[0038] 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.

[0039] 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 contains the first grating period and the second grating period.

[0040] S120. The grating period is superimposed according to the preset grating superposition function and initial parameter information to obtain the corresponding amplitude distribution information.

[0041] 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.

[0042] 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.

[0043] Specifically, the second amplitude distribution corresponding to the second grating in the grating period is calculated according to a grating superposition function, and the grating superposition function can be expressed by formula (2):

[0044] (2);

[0045] wherein H2(x1, y1) is the second amplitude distribution, π is a circular constant, x 1, y 1 is a coordinate of the spectrum plane.

[0046] 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 according to the grating superposition function. The specific calculation formula can be expressed by formula (3):

[0047] (3);

[0048] wherein H1(x1, y1) is the first amplitude distribution, and Δθ is the phase difference, which can be usually set as π / 2.

[0049] Then, in order to realize the optical logic operation on the image, the metasurface can be superimposed with two sinusoidal amplitude modulation gratings with a phase difference of π / 2 in the spectrum plane, and the specific expression can be expressed by formula (4):

[0050] (4);

[0051] Then, H(x1, y1) obtained is the amplitude distribution information.

[0052] In S130, the amplitude distribution information is matched and mapped according to a preset transmittance distribution table, so as to obtain the size arrangement information of the microstructure.

[0053] Further, the transmittance distribution table can be preset, and the transmittance distribution table is obtained by scanning microstructures with different sizes respectively. For example, in the embodiment of the present application, the microstructures with a diameter ranging from 80nm to 270nm are scanned respectively under two wavelengths of a first wavelength λ1=632nm and a second wavelength λ2=531nm, and the light transmittance of the microstructure diameter under different wavelengths is as shown in Table 1. Figure 2 Based on the transmittance distribution table, the amplitude distribution information can be matched and mapped, so as to obtain the size arrangement information of the microstructure.

[0054] In specific embodiments, the step S130 comprises the sub-steps of: calculating the 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 the target size corresponding to each position; and integrating the target size of each position to obtain the size arrangement information.

[0055] Specifically, the target transmittance corresponding to each position is calculated according to the amplitude distribution information. A plurality of microstructures need to be arranged in the metasurface device, and each position on the plane corresponding to the metasurface device corresponds to an arranged microstructure. The target transmittance corresponding to each position can be calculated.

[0056] The target transmittance of each position is matched according to the transmittance distribution table, and the size in the transmittance distribution table that matches the target transmittance of each position is obtained as the target size. Each position can be matched and mapped to obtain a target size. The target size of each position is integrated, that is, the target size is sorted according to the coordinates of different positions, and the size arrangement information is obtained. The size arrangement information includes the target size corresponding to the microstructure of each position.

[0057] In specific embodiments, the calculation of the target transmittance corresponding to each position according to the amplitude distribution information comprises: calculating the first transmittance corresponding to each position according to the first amplitude distribution in the amplitude distribution information; calculating the second transmittance corresponding to each position according to the second amplitude distribution in the amplitude distribution information; and combining the first transmittance and the second transmittance of the same position as the target transmittance.

[0058] The first transmittance corresponding to each position can be calculated according to the first amplitude distribution in the amplitude distribution information. Since the first amplitude distribution and the second amplitude distribution in the amplitude distribution information are both amplitude distributions corresponding to the spectral plane in the metasurface, the amplitude of each position in the first amplitude distribution can be obtained and the square value can be calculated. The square value of the amplitude of a position is the first transmittance of the position, which is the target transmittance of the microstructure corresponding to the position in the metasurface. Similarly, the second transmittance of each position can be calculated by the second amplitude distribution. The first transmittance corresponding to the first wavelength and the second transmittance corresponding to the second wavelength can be obtained for the same position in the metasurface. The first transmittance and the second transmittance corresponding to each position are combined to obtain the target transmittance.

[0059] In specific embodiments, the matching 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 the transmittance of a first wavelength in the transmittance distribution table and a first transmittance in the target transmittance of each position, and a first amplitude response difference value corresponding to each size; obtaining the transmittance of a second wavelength in the transmittance distribution table and a second transmittance in the target transmittance of each position, and a second amplitude response difference value corresponding to each size; and screening the size of each position when the total response error is the smallest according to the screening function set in the transmittance distribution table and the first amplitude response difference value and the second amplitude response difference value, and setting as the corresponding target size.

[0060] The transmittance distribution table contains the transmittance of microstructures of different sizes (diameter l of microstructure) at different wavelengths, and the matching mapping can be performed through the transmittance distribution table to obtain the first amplitude response difference value corresponding to each size of a first transmittance in the target transmittance of each position at a first wavelength. According to the transmittance distribution table, the first amplitude response difference value corresponding to each size of the first transmittance of a certain position at the first wavelength can be obtained, and the first amplitude response difference value corresponding to each size of each position can be obtained in turn.

[0061] Similarly, according to the matching mapping of the transmittance distribution table, the second amplitude response difference value corresponding to each size of a second transmittance in the target transmittance of each position at a second wavelength can be obtained.

[0062] According to the screening function set in the transmittance distribution table and the first amplitude response difference value and the second amplitude response difference value obtained in the above steps, the target size corresponding to each position can be screened. The screening function can be expressed by formula (5) as follows:

[0063] (5);

[0064] Wherein, FOM is the total response error obtained by the screening function, A λ1 real is the transmittance of the microstructure of a certain size at the first wavelength in the transmittance distribution table, A λ1 design is a first transmittance of a certain position in the target transmittance, A λ2 real is the transmittance of the microstructure of the same size (the same size as A λ1 real is the transmittance of the microstructure of the same size (the same size as A λ2 design is a second transmittance of the same position (the same position as the position of the first transmittance) in the target transmittance.

[0065] 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.

[0066] 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.

[0067] 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 3 As 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.

[0068] 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.

[0069] 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.

[0070] The method for designing a metasurface device based on logical optical operation and the imaging device 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 size arrangement information of a microstructure; setting an overall structure size according to size information in the initial parameter information and the size arrangement information to obtain corresponding metasurface device design information. The above method obtains metasurface device design information and designs a metasurface device, applies the designed metasurface device to an imaging device, and thus realizes optical logical operation on incident images and accurate acquisition of imaging images, thereby greatly improving the efficiency of optical logical operation on images.

[0071] The embodiment of the present application also provides an imaging device, as shown in Figure 3 and Figure 4 The imaging device includes a first lens 1, a metasurface device 2, and a second lens 3; the axial spacing between two incident images and the first lens 1, the axial spacing between the first lens 1 and the metasurface device 2, and the axial spacing 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; the first imaging image and the second imaging image are obtained on the focal plane of the second lens 3 away from the metasurface device 2. The microstructure in the metasurface device 2 is designed by the method for designing a metasurface device based on logical optical operation as described in the above embodiments.

[0072] In a more specific embodiment, the metasurface device 2 is composed of a substrate layer 21 and a microstructure 22, and the side of the microstructure is arranged to face the second lens. Specifically, the microstructure is periodically and regularly arranged on the substrate, and the shape of the microstructure is a nanocolumn or a nanopore.

[0073] Specifically, the imaging device can be applied to multiple wave bands such as ultraviolet, visible light, near-infrared, mid-infrared, etc. Among them, the material of the substrate layer in the metasurface device is a material transparent to the designed wave band; for example, in the visible light or near-infrared wave band, the substrate material can be PMMA, silicon dioxide, silicon nitride, etc.; in the mid-infrared wave band, the material can be fluoride glass, chalcogenide glass, germanium-silicon glass, etc. The material of the microstructure in the metasurface device can be amorphous silicon, polycrystalline silicon, silicon nitride, titanium dioxide, gallium nitride, chalcogenide, etc. The microstructure is regularly arranged in a periodic manner (such as a square arrangement, a hexagonal arrangement, etc.) on the substrate, and the specific shape of the microstructure includes but is not limited to a nano-cylinder, a nano-cross-cylinder, a nano-hole, a nano-cross-hole, and a microstructure with a specific shape obtained by optimization.

[0074] If the intensities of the two incident images are I1(x,y) and I2(x,y) respectively, E a and E b , the total intensity of the images can be expressed as:

[0075] If the detection wavelength is Lambda 1, the two images are Fourier transformed by the first lens to reach the metasurface, and after modulation by the metasurface, the spatial spectrum can be written as:

[0076] ;

[0077] F a and F b are the Fourier transforms of E a and E b , u is the spatial frequency in the x direction, and after passing through the second lens, a first inverse Fourier transform result is obtained at the focal plane, which is as follows:

[0078] ;

[0079] From the above formula, it can be seen that (0,0) is E a and E b destructive interference, and finally the same characteristic parts of the two images are displayed.

[0080] If the detection wavelength is Lambda 2, after the two images are Fourier transformed by the first lens and modulated by the metasurface, the spatial spectrum can be written as:

[0081] ​;

[0082] After the second lens, the first inverse Fourier transform result is obtained at the focal plane, and the result is as follows:

[0083] ;

[0084] As can be seen from the above formula, (0, 0) is E a and the constructive interference of E b Finally, the different characteristic parts of the two images are shown. The above is a physical principle analysis of the implementation process of the imaging device.

[0085] In the specific embodiment, the two incident images are incident on the first lens (the first lens and the second lens form a 4f system) at a distance of 2d = 4mm after being illuminated by lasers with wavelengths λ1 = 632nm and λ2 = 531nm. The focal length of the first lens is 63.2mm, and the light beam is focused to the super surface, modulated in amplitude and propagated for 63.2mm, then irradiated to the second lens, and then propagated for a focal length to the receiving surface (the receiving surface is also the focal plane of the second lens). If the receiving surface is filtered with a wavelength of 632nm, the overlapping part of the two images will be received, that is, the “and” operation is performed. If the receiving surface is filtered with a wavelength of 531nm, the difference part of the two images will be received, that is, the “XOR” operation is performed. The specific application effect is shown in Figure 4 .

[0086] The specific working principle of the imaging device in this embodiment is shown in Figure 5 , and Figure 5 gives the original image of the two incident images and the first and second imaging images obtained after operation. It can be seen that when the detection wavelength is 632nm, the first imaging image obtained is the overlapping part of the triangle and the square; when the detection wavelength is 531nm, the imaging image obtained is the difference part of the two incident images.

[0087] As shown in Figure 6As shown, the embodiment of the present application also provides a metasurface device design apparatus 100 based on logical optical operation, which comprises the following units arranged in a control terminal: a grating period acquisition unit 110, configured 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, configured to superimpose the grating period according to a preset grating superposition function and initial parameter information, to obtain corresponding amplitude distribution information; a matching mapping unit 130, configured to match and map the amplitude distribution information according to a preset transmittance distribution table, to obtain size arrangement information of a microstructure; and a design information acquisition unit 140, configured to set overall structure size according to size information in the initial parameter information and the size arrangement information, to obtain corresponding metasurface device design information.

[0088] The metasurface device design apparatus based on logical optical operation provided in the embodiment of the present application applies the above-mentioned metasurface device design method based on logical optical operation, 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 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 size arrangement information of a microstructure, and sets overall structure size according to size information in the initial parameter information and the size arrangement information, to obtain corresponding metasurface device design information. The above-mentioned method obtains metasurface device design information and designs a metasurface device, applies the designed metasurface device to an imaging device, so as to realize optical logical operation on an incident image and accurately obtain an imaging image, thereby greatly improving the efficiency of optical logical operation on an image.

[0089] The above-mentioned metasurface device design apparatus based on logical optical operation can be realized in the form of a computer program, which can run on a computer device as shown. Figure 7

[0090] Please refer to Figure 7 , Figure 7 is a schematic block diagram of the computer device provided in the embodiment of the present application. The computer device can be a control terminal for executing a metasurface device design method based on logical optical operation to design corresponding metasurface device design information according to requirements.

[0091] Please refer to Figure 7 , the computer device 500 comprises a processor 502, a memory and a communication interface 505 connected through a communication bus 501, wherein the memory can comprise a storage medium 503 and an internal memory 504. ​

[0092] The storage medium 503 can store an operating system 5031 and a computer program 5032. The computer program 5032, when executed, can cause the processor 502 to perform the method for designing a metasurface device based on a logical optical operation. The storage medium 503 can be a volatile storage medium or a non-volatile storage medium.

[0093] The processor 502 is configured to provide computing and control capabilities to support the operation of the entire computer device 500.

[0094] The internal memory 504 provides an environment for the execution of the computer program 5032 in the storage medium 503. The computer program 5032, when executed by the processor 502, can cause the processor 502 to perform the method for designing a metasurface device based on a logical optical operation.

[0095] The communication interface 505 is configured to perform network communication, such as providing transmission of data information, and the like. Those skilled in the art can understand that the communication interface 505 can be configured to perform communication with a network device through wired or wireless communication, and the like. Figure 7 The structure shown in FIG. 5 is only a block diagram of part of the structure related to the method, and does not limit the computer device 500 to which the method is applied. Specifically, the computer device 500 can include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0096] The processor 502 is configured to run the computer program 5032 stored in the memory to implement the corresponding functions in the method for designing a metasurface device based on a logical optical operation.

[0097] Those skilled in the art can understand that the computer device shown in FIG. 5 is only a specific implementation of the computer device, and the application is not limited to this specific implementation. Figure 7 The embodiments of the computer device shown in FIG. 5 do not limit the specific structure of the computer device. In other embodiments, the computer device can include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components. For example, in some embodiments, the computer device can only include a memory and a processor. In such embodiments, the structure and functions of the memory and the processor are consistent with those of the memory 504 and the processor 502 shown in the embodiments, and will not be described here. Figure 7

[0098] ​It should be understood that, in the embodiments of the present application, the processor 502 can be a central processing unit (CPU), and can also 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 gates or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor.

[0099] In another embodiment of the present application, a computer readable storage medium is provided. The computer readable storage medium can be a volatile or non-volatile computer readable storage medium. The computer readable storage medium stores a computer program, wherein the computer program is executed by a processor to implement the steps included in the above-mentioned method for designing a metasurface device based on a logic optical operation.

[0100] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-mentioned devices, apparatuses and units can refer to the corresponding processes in the foregoing method embodiments, which will not be described here. Those of ordinary skill in the art can realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be realized in electronic hardware, computer software or a combination of both. In order to clearly illustrate the interchangeability of hardware and software, the components and steps of the examples have been described in a general manner in the foregoing description. Whether the functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. The skilled person can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0101] In several embodiments provided by the present application, 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 schematic, for example, the division of the units is merely logical function division, and actual implementation can have another division manner, or units with the same function can be combined into one unit, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, and can also be electrical, mechanical or other form of connection.

[0102] The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, i.e., may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment of the present application.

[0103] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0104] The integrated unit, if realized in the form of a software functional unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application essentially or the part of the prior art that contributes to the present application, or all or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a computer readable storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned computer readable storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a magnetic disk or an optical disk, and various program code storage media.

[0105] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for designing metasurface devices based on logic optical operations, characterized in that, 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.

2. The metasurface device design method based on logic optical operations according to claim 1, characterized in that, The step of setting the grating period corresponding to the initial parameter information according to the preset period setting rule includes: The first grating period corresponding to the first wavelength in the initial parameter information is set according to the setting function in the period setting rule; Obtain the ratio of the first wavelength to the second wavelength from the initial parameter information; Multiplying the ratio by the first grating period yields the second grating period corresponding to the second wavelength; The first grating period is combined with the second grating period to obtain the grating period corresponding to the initial parameter information.

3. The metasurface device design method based on logic optical operations according to claim 1, characterized in that, The step of superimposing the grating period according to a preset grating superposition function and initial parameter information to obtain the corresponding amplitude distribution information includes: Calculate the second amplitude distribution corresponding to the second grating period in the grating period based on the grating superposition function; Calculate the first amplitude distribution corresponding to the first grating period in the grating period and the phase difference in the initial parameter information based on the grating superposition function; The first amplitude distribution is superimposed with the second amplitude distribution to obtain the corresponding amplitude distribution information.

4. The metasurface device design method based on logic optical operations according to claim 1, characterized in that, The step of matching and mapping the amplitude distribution information according to a preset transmittance distribution table to obtain the size arrangement information of the microstructure includes: Calculate the target transmittance at each location based on the amplitude distribution information; The target transmittance at each location is matched and mapped according to the transmittance distribution table to obtain the target size corresponding to each location; The size arrangement information is obtained by integrating the target dimensions at each location.

5. The metasurface device design method based on logic optical operations according to claim 4, characterized in that, The step of calculating the target transmittance at each location based on the amplitude distribution information includes: The first transmittance corresponding to each position is calculated based on the first amplitude distribution in the amplitude distribution information; The second transmittance corresponding to each position is calculated based on the second amplitude distribution in the amplitude distribution information; The first transmittance and the second transmittance at the same location are combined to form the target transmittance.

6. The metasurface device design method based on logic optical operations according to claim 5, characterized in that, 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: Obtain the first transmittance corresponding to the first wavelength in the transmittance distribution table and the first transmittance in the target transmittance at each position, and the first amplitude response difference corresponding to each size; Obtain the transmittance corresponding to the second wavelength in the transmittance distribution table and the second transmittance in the target transmittance at each position, and the difference in the second amplitude response corresponding to each size; Based on the filtering function set in the transmittance distribution table and the first amplitude response difference and the second amplitude response difference, the dimensions at each position with the minimum total response error are selected and set as the corresponding target dimensions.

7. The metasurface device design method based on logic optical operations according to any one of claims 4-6, characterized in that, The step of setting the overall structural dimensions based on the dimension information and the dimension arrangement information in the initial parameter information to obtain the corresponding metasurface device design information includes: The basic dimensions of each microstructure are set according to the aforementioned size information; The basic dimensions of each microstructure and the size arrangement information are used to set the overall structural dimensions to obtain the corresponding metasurface device design information.

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