Method, device, system and electronic equipment for transmitting information using longitudinal light field

Abstract

The application discloses a method, device, system and electronic equipment for transmitting information by using longitudinal light field, and relates to the technical field of longitudinal field customization of light field, and the method comprises the steps of determining self-Gaussian point array information and hidden transverse field point array information of to-be-transmitted information; determining initial longitudinal light field distribution of the to-be-transmitted information according to the Gaussian point array information; determining transverse light field distribution of the to-be-transmitted information according to the initial longitudinal light field distribution and the hidden transverse field point array information; determining target longitudinal light field distribution of the to-be-transmitted information based on the initial longitudinal light field distribution and the transverse light field distribution; determining incident light field of the to-be-transmitted information based on the target longitudinal light field distribution by using inverse Fourier transform; and transmitting the incident light field as ciphertext of the to-be-transmitted information. For any to-be-transmitted information, the incident light field can be obtained by backstepping the self-Gaussian point array information and the hidden transverse field point array information, so that the information is transmitted by using the longitudinal light field.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of light field longitudinal field customization, in particular to a method, device, system and electronic equipment for transmitting information by using longitudinal light field. BACKGROUND

[0002] The prior art method for transmitting information by using light field can only rely on the transverse light field to encode and decode information, and lacks a way of transmitting information by using longitudinal light field, which makes the spatial degrees of freedom of light field not fully utilized and developed.

[0003] In optics, it is generally believed that the polarization direction of light is perpendicular to its propagation direction. However, under tight focusing conditions, the light field will have a polarization component along its propagation direction, i.e. optical longitudinal field, and the longitudinal component of the light field under tight focusing conditions is usually difficult to ignore, and the optical longitudinal field also induces many new effects and phenomena in the process of interaction with matter. However, the generation of the optical longitudinal field is currently passive, i.e. by tight focusing of the incident light field. The disadvantage of this method is that for a given incident light field, its longitudinal field distribution is fixed, so it is difficult to obtain a longitudinal field with an arbitrary distribution, making it impossible to use the optical longitudinal field to transmit any information. SUMMARY

[0004] The purpose of the present application is to provide a method, device, system and electronic equipment for transmitting information by using longitudinal light field, which can transmit any information by using longitudinal light field.

[0005] To achieve the above-mentioned purpose, the present application provides the following solutions:

[0006] A method for transmitting information by using longitudinal light field, the method comprising:

[0007] determining self-Gaussian lattice information and hidden transverse field lattice information of the information to be transmitted; the self-Gaussian lattice information comprises: the total number of Gaussian points in the self-Gaussian lattice, the horizontal coordinates of each Gaussian point in the self-Gaussian lattice, the vertical coordinates of each Gaussian point in the self-Gaussian lattice and the beam waist of the self-Gaussian lattice; the hidden transverse field lattice information comprises: the total number of Gaussian points in the hidden transverse field lattice, the horizontal coordinates of each Gaussian point in the hidden transverse field lattice, the vertical coordinates of each Gaussian point in the hidden transverse field lattice and the beam waist of the hidden Gaussian lattice;

[0008] determining the initial longitudinal light field distribution of the information to be transmitted according to the Gaussian lattice information;

[0009] determining the transverse light field distribution of the information to be transmitted according to the initial longitudinal light field distribution and the hidden transverse field lattice information;

[0010] determining a target longitudinal light field distribution of the information to be transmitted based on the initial longitudinal light field distribution and the transverse light field distribution;

[0011] determining an incident light field of the information to be transmitted based on the target longitudinal light field distribution by using an inverse Fourier transform;

[0012] transmitting the incident light field as a ciphertext of the information to be transmitted.

[0013] Optionally, the transverse light field distribution of the information to be transmitted is determined according to the initial longitudinal light field distribution and the hidden transverse field point array information, and specifically includes:

[0014] determining an initial transverse light field distribution of the information to be transmitted according to the initial longitudinal light field distribution;

[0015] determining a hidden transverse light field distribution of the information to be transmitted according to the hidden transverse field point array information;

[0016] determining the transverse light field distribution according to the initial transverse light field distribution and the hidden transverse light field distribution.

[0017] Optionally, the hidden transverse light field distribution of the information to be transmitted is determined according to the hidden transverse field point array information, and specifically includes:

[0018] for any current Gaussian point in the hidden transverse field point array:

[0019] calculating a radial coordinate of the current Gaussian point according to the horizontal coordinate and the vertical coordinate of the current Gaussian point;

[0020] calculating a spin coordinate of the current Gaussian point according to the horizontal coordinate and the vertical coordinate of the current Gaussian point;

[0021] calculating the hidden transverse light field distribution according to the total number of Gaussian points in the hidden transverse field point array, the radial coordinates of all Gaussian points in the hidden transverse field point array, the spin coordinates of all Gaussian points in the hidden transverse field point array, and the beam waist of the self Gaussian point array.

[0022] Optionally, the target longitudinal light field distribution of the information to be transmitted is determined based on the initial longitudinal light field distribution and the transverse light field distribution, and specifically includes:

[0023] determining a total spectrum according to a spectrum of the initial longitudinal light field distribution and a spectrum of the transverse light field distribution;

[0024] determining a numerical aperture of a focusing objective lens in a tight focusing process and a preset free space wave number;

[0025] determining a spectrum space filtering function according to the numerical aperture and the free space wave number;

[0026] filtering the total spectrum by using the spectral spatial filter function to obtain a filtered total spectrum;

[0027] performing inverse Fourier transform on the filtered total spectrum to obtain the target longitudinal light field distribution.

[0028] Optionally, determining, by using inverse Fourier transform, an incident light field of the information to be transmitted based on the target longitudinal light field distribution, specifically comprising:

[0029] determining a focal length of the focusing objective lens and a coordinate transformation matrix in the tight focusing process;

[0030] determining the incident light field according to the focal length, the coordinate transformation matrix and the spectrum of the target longitudinal light field distribution by using inverse Fourier transform.

[0031] An apparatus for transmitting information by using longitudinal light field, configured to implement the method for transmitting information by using longitudinal light field according to any one of the preceding method, the apparatus comprising: a laser generator, a horizontal polarization light generating module, a beam expander lens combination, a spatial light modulator loaded with a two-dimensional holographic grating corresponding to information to be transmitted, a filtering module, a quarter-wave plate, a Ronchi grating, a tight focusing module, a beam splitter, a radial polarization converter, a polarization beam splitting module and a longitudinal detector.

[0032] The laser generator is configured to emit linearly polarized light.

[0033] The horizontal polarization light generating module is arranged on an outgoing light path of the linearly polarized light and configured to adjust light intensity of the linearly polarized light and convert the linearly polarized light with adjusted light intensity into horizontal polarization light.

[0034] The beam expander lens combination is arranged on an outgoing light path of the horizontal polarization light and configured to focus and collimate the horizontal polarization light to obtain expanded horizontal polarization light.

[0035] The spatial light modulator is arranged on an outgoing light path of the expanded horizontal polarization light and configured to diffract the expanded horizontal polarization light to obtain diffracted horizontal polarization light.

[0036] The filtering module is arranged on an outgoing light path of the diffracted horizontal polarization light and configured to filter the diffracted horizontal polarization light to obtain diffracted horizontal polarization light; the diffracted horizontal polarization light comprises first diffracted polarization light and second diffracted polarization light.

[0037] The quarter-wave plate is arranged on an outgoing light path of the diffracted horizontal polarization light and configured to adjust the first diffracted polarization light into left-handed circularly polarized light and the second diffracted polarization light into right-handed circularly polarized light.

[0038] The Ronchi grating is arranged on an outgoing light path of the left-handed circularly polarized light and the right-handed circularly polarized light, and is used for coherently superimposing the left-handed circularly polarized light and the right-handed circularly polarized light to generate an incident light field of the information to be transmitted;

[0039] The tight focusing module is used for tightly focusing the received incident light field to generate a tight focusing light field;

[0040] The beam splitter is arranged on an outgoing light path of the tight focusing light field, and is used for splitting the tight focusing light field to obtain a first tight focusing light field and a second tight focusing light field; the first tight focusing light field is a transverse component of the tight focusing light field, and the second tight focusing light field is a longitudinal component of the tight focusing light field;

[0041] The radial polarization converter is arranged on an outgoing light path of the second tight focusing light field, and is used for splitting the second tight focusing light field into a horizontal tight focusing light field and a vertical tight focusing light field;

[0042] The polarization beam splitting module is arranged on an outgoing light path of the horizontal tight focusing light field and an outgoing light path of the vertical tight focusing light field, and is used for filtering out the horizontal tight focusing light field; the outgoing light path of the horizontal tight focusing light field and the outgoing light path of the vertical tight focusing light field coincide;

[0043] The longitudinal detector is arranged on an outgoing light path of the vertical tight focusing light field after the polarization beam splitting module, and is used for receiving the vertical tight focusing light field after the horizontal tight focusing light field is filtered out to obtain the information to be transmitted.

[0044] A system for transmitting information by using a longitudinal light field, the system comprising:

[0045] An initial information determination module is configured to determine self-Gaussian lattice information and hidden transverse field lattice information of information to be transmitted; the self-Gaussian lattice information comprises a total number of Gaussian points in a self-Gaussian lattice, horizontal coordinates of each Gaussian point in the self-Gaussian lattice, vertical coordinates of each Gaussian point in the self-Gaussian lattice, and a beam waist of the self-Gaussian lattice; the hidden transverse field lattice information comprises a total number of Gaussian points in a hidden transverse field lattice, horizontal coordinates of each Gaussian point in the hidden transverse field lattice, vertical coordinates of each Gaussian point in the hidden transverse field lattice, and a beam waist of the hidden Gaussian lattice;

[0046] An initial longitudinal light field distribution determination module is configured to determine an initial longitudinal light field distribution of the information to be transmitted according to the Gaussian lattice information;

[0047] A transverse light field distribution determination module is configured to determine a transverse light field distribution of the information to be transmitted according to the initial longitudinal light field distribution and the hidden transverse field lattice information.

[0048] a target longitudinal light field distribution determination module configured to determine a target longitudinal light field distribution of the information to be transmitted based on the initial longitudinal light field distribution and the transverse light field distribution;

[0049] an incident light field determination module configured to determine an incident light field of the information to be transmitted based on the target longitudinal light field distribution by using an inverse Fourier transform;

[0050] a transmission module configured to transmit the incident light field as a ciphertext of the information to be transmitted.

[0051] An electronic device includes a memory configured to store a computer program and a processor configured to execute the computer program to cause the electronic device to perform the method for transmitting information by using a longitudinal light field.

[0052] Optionally, the memory is a readable storage medium.

[0053] According to the embodiments of the present application, the following technical effects are provided.

[0054] The present application discloses a method, device, system and electronic device for transmitting information by using a longitudinal light field. Firstly, the information to be transmitted is determined, and the Gaussian point array information of the information to be transmitted and the hidden transverse field point array information are preset. Then, the incident light field of the information to be transmitted is determined by backstepping according to the above information, and the incident light field is transmitted as a ciphertext of the information to be transmitted. In the backstepping, firstly, the initial longitudinal light field distribution is determined according to the Gaussian point array information, and the transverse light field distribution is determined according to the initial longitudinal light field distribution and the hidden transverse field point array information. Then, the target longitudinal light field distribution of the information to be transmitted is determined based on the initial longitudinal light field distribution and the transverse light field distribution. Finally, the incident light field of the information to be transmitted is determined based on the target longitudinal light field distribution by using an inverse Fourier transform. For any information to be transmitted, the incident light field can be obtained by backstepping according to the Gaussian point array information and the hidden transverse field point array information, so that the transmission of information by using a longitudinal light field is realized. BRIEF DESCRIPTION OF DRAWINGS

[0055] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0056] Figure 1 A method flowchart for transmitting information by using a longitudinal light field is provided for Embodiment 1 of the present application.

[0057] Figure 2 schematic diagram of an initial longitudinal light field distribution of the Arabic numeral "5";

[0058] Figure 3 schematic diagram of a hidden transverse light field distribution of the Arabic numeral "5";

[0059] Figure 4 schematic diagram of a target longitudinal light field distribution of the Arabic numeral "5";

[0060] Figure 5 schematic diagram of a device structure for transmitting information using a longitudinal light field provided by embodiment 2 of the present application.

[0061] Symbol explanation:

[0062] laser generator - 1, half-wave plate - 2, first polarization beam splitter - 3, first lens - 4, second lens - 5, first beam splitter - 6, spatial light modulator - 7, third lens - 8, beam blocker - 9, quarter-wave plate - 10, fourth lens - 11, Ronchi grating - 12, first mirror - 13, fifth lens - 14, sixth lens - 15, second mirror - 16, first focusing objective - 17, second focusing objective - 18, second beam splitter - 19, radial polarization converter - 20, second polarization beam splitter - 21, seventh lens - 22, first light intensity detection camera - 23, polaroid - 24, eighth lens - 25, second light intensity detection camera - 26. DETAILED DESCRIPTION

[0063] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0064] The purpose of the present application is to provide a method, device, system and electronic equipment for transmitting information using a longitudinal light field.

[0065] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0066] Embodiment 1

[0067] Figure 1 A schematic diagram of a method for transmitting information using a longitudinal light field provided by embodiment 1 of the present application is shown in FIG. 1. As shown in FIG. 1, the method for transmitting information using a longitudinal light field in the present embodiment includes: Figure 1 ​

[0068] Step 101: determining self-Gaussian lattice information and hidden transverse field lattice information of the information to be transmitted.

[0069] The self-Gaussian lattice information includes the total number of Gaussian points in the self-Gaussian lattice, the horizontal coordinates of the Gaussian points in the self-Gaussian lattice, the vertical coordinates of the Gaussian points in the self-Gaussian lattice, and the beam waist of the self-Gaussian lattice. The hidden transverse field lattice information includes the total number of Gaussian points in the hidden transverse field lattice, the horizontal coordinates of the Gaussian points in the hidden transverse field lattice, the vertical coordinates of the Gaussian points in the hidden transverse field lattice, and the beam waist of the hidden Gaussian lattice.

[0070] Step 102: determining the initial longitudinal light field distribution of the information to be transmitted according to the Gaussian lattice information.

[0071] Specifically, when an arbitrary preset light field distribution (i.e., the initial longitudinal light field distribution) is given first, it is assumed to be a longitudinal field that needs to be customized in experiments, and the preset light field distribution includes amplitude and phase distributions. In principle, the preset light field distribution can be arbitrarily specified, however, in order to encode information in the scheme of customizing the longitudinal field, it is assumed without loss of generality that the given longitudinal field amplitude distribution is a Gaussian lattice, and the phase distribution is uniformly 0 without special instructions, then the expression of the initial longitudinal light field distribution is:

[0072]

[0073] where N1 is the total number of Gaussian points in the self-Gaussian lattice, x n1 is the horizontal coordinate of the nth1 Gaussian point in the self-Gaussian lattice, y n1 is the vertical coordinate of the nth1 Gaussian point in the self-Gaussian lattice, x is the horizontal direction in the entire rectangular coordinate system, y is the vertical direction in the entire rectangular coordinate system, and a0 is the beam waist of the self-Gaussian lattice. Wherein N1, x n1 , y n1 are determined by the plaintext (i.e., the information to be transmitted), and the size of a0 can be adjusted according to the actual situation, such as a0 = 2λ, λ is the wavelength of linearly polarized light, and the wavelengths of other lights converted from linearly polarized light during transmission are all λ, and the origin of the rectangular coordinate system can be set according to the actual situation, such as being set at the center of the self-Gaussian lattice.

[0074] When the information to be transmitted is the Arabic numeral "5", the initial longitudinal light field distribution of the Arabic numeral "5" is as shown in Figure 2 At this time, the value of N1 is 11. For different plaintexts, the number of Gaussian points in the self-Gaussian lattice and the coordinates of each Gaussian point are different.

[0075] ​Step 103: Determine the transverse light field distribution of the information to be transmitted based on the initial longitudinal light field distribution and the hidden transverse field lattice information.

[0076] As an optional implementation, step 103 specifically includes:

[0077] Step 1031: Determine the initial transverse light field distribution of the information to be transmitted based on the initial longitudinal light field distribution.

[0078] Specifically, under tight focusing conditions, the optical field contains longitudinal and transverse components, which are coupled and correlated with each other. Therefore, the longitudinal field cannot exist independently; it must be accompanied by a related transverse field. For the initial longitudinal optical field distribution, its corresponding transverse field component (i.e., the initial transverse optical field distribution) can be obtained by solving the Helmholtz equation. The calculation formula is as follows:

[0079]

[0080] in, This represents the initial transverse light field distribution, where ⊥ denotes the transverse component, and j is the imaginary unit. For horizontal Laplace operators, Indicates the inverse Fourier transform, k z k ⊥ These are the longitudinal and transverse wave vectors of the light field, respectively. Indicates the initial longitudinal light field distribution The spectrum, F represents the Fourier transform.

[0081] Step 1032: Determine the hidden transverse light field distribution of the information to be transmitted based on the hidden transverse field lattice information.

[0082] As an optional implementation, step 1032 specifically includes:

[0083] For any current Gaussian point in the hidden transverse field lattice:

[0084] Calculate the radial coordinates of the current Gaussian point based on its horizontal and vertical coordinates.

[0085] Specifically, the formula for calculating the radial coordinate is:

[0086] Among them, R n2 To hide the radial coordinates of the n2th Gaussian point in the transverse field lattice, x n2 To hide the horizontal coordinates of the n2th Gaussian point in the transverse field lattice, y n2 To hide the vertical coordinates of the n2th Gaussian point in the horizontal field lattice.

[0087] According to the horizontal coordinate and the vertical coordinate of the current Gaussian point, the spin coordinate of the current Gaussian point is calculated.

[0088] Specifically, the calculation formula of the spin coordinate is:

[0089] Wherein, φ n2 is the spin coordinate of the nth2 Gaussian point in the hidden transverse field point array.

[0090] According to the total number of Gaussian points in the hidden transverse field point array, the radial coordinates of all Gaussian points in the hidden transverse field point array, the spin coordinates of all Gaussian points in the hidden transverse field point array, and the beam waist of the Gaussian point array itself, the hidden transverse light field distribution is calculated.

[0091] Specifically, in order to hide the plaintext information, an additional transverse field E Hide is added. Hide The calculation formula of the hidden transverse light field distribution E

[0092]

[0093] Wherein, N2 is the total number of Gaussian points in the hidden transverse field point array (the hidden transverse field point array is a point array composed of additional Gaussian points required for the Gaussian field point array itself), and the sum of N1 and N2 is a fixed value for a certain field. For example, when the information to be transmitted is the Arabic numeral "5", the value of N1 is 11, the value of N2 is 4, N1+N2=15, and 15 is the fixed value at this time. is the spin polarization of the nth2 Gaussian point in the hidden transverse field point array, b0 is the hidden Gaussian point array beam waist, and the size of b0 can be adjusted according to actual conditions, such as b0=2λ, is the horizontal polarization basis vector, is the vertical polarization basis vector. When the information to be transmitted is the Arabic numeral "5", the hidden transverse light field distribution of the Arabic numeral "5" is as shown in Figure 3 .

[0094] Step 1033: According to the initial transverse light field distribution and the hidden transverse light field distribution, the transverse light field distribution is determined.

[0095] Specifically, the calculation formula of the transverse light field distribution is:

[0096]

[0097] Step 104: Based on the initial longitudinal light field distribution and the transverse light field distribution, the target longitudinal light field distribution of the information to be transmitted is determined.

[0098] As an optional implementation, step 104 specifically includes:

[0099] According to the spectrum of the initial longitudinal light field distribution and the spectrum of the transverse light field distribution, a total spectrum is determined.

[0100] Specifically, the initial longitudinal light field distribution is subjected to Fourier transformation to obtain the spectrum of the initial longitudinal light field distribution, the transverse light field distribution is subjected to Fourier transformation to obtain the spectrum of the transverse light field distribution, and the spectrum of the initial longitudinal light field distribution and the spectrum of the transverse light field distribution are added to obtain the total spectrum.

[0101] The numerical aperture of the focusing objective lens in the tight focusing process and a preset free-space wave number are determined.

[0102] According to the numerical aperture and the free-space wave number, a spectral spatial filter function is determined.

[0103] The total spectrum is filtered by using the spectral spatial filter function to obtain a filtered total spectrum.

[0104] The filtered total spectrum is subjected to inverse Fourier transformation to obtain a target longitudinal light field distribution.

[0105] Specifically, in order to ensure that all light field components are propagable, i.e., there is no evanescent wave, the light field needs to be filtered in the spatial frequency domain to ensure that all components satisfy the propagable condition.

[0106] The calculation formula of the target longitudinal light field distribution is:

[0107] wherein, E f is a longitudinal field (i.e., the target longitudinal light field distribution) that satisfies the physical reality, can reasonably exist, and is customized, Θ(k x ,k y is a spectral spatial filter function, k x is a horizontal direction of the spectral coordinate, and k y is a vertical direction of the spectral coordinate.

[0108] When the to-be-transmitted information is the Arabic numeral "5", the target longitudinal light field distribution of the Arabic numeral "5" is as shown in FIG. 5. Figure 4

[0109] Step 105: An incident light field of the to-be-transmitted information is determined based on the target longitudinal light field distribution by using inverse Fourier transformation.

[0110] As an optional implementation, step 105 specifically includes:

[0111] The focal length of the focusing objective lens and the coordinate transformation matrix in the tight focusing process are determined.

[0112] ​By inverse Fourier transform, the incident light field is determined according to the focal length, the coordinate transformation matrix and the spectrum of the target longitudinal light field distribution.

[0113] Specifically, the calculation formula of the incident light field is:

[0114] Wherein, E i is the incident light field, f1 is the focal length of the focusing objective lens, M -1 is the coordinate transformation matrix in the tight focusing process, is the spectrum of E f .

[0115] In fact, the incident light field E i can be expanded into left and right circularly polarized components by left and right circularly polarized basis vectors, that is, and respectively are the complex amplitude distribution of the left circularly polarized component of the incident light field and the complex amplitude distribution of the right circularly polarized component of the incident light field, and respectively are the left circularly polarized basis vector and the right circularly polarized basis vector. The incident light field can be used as ciphertext to generate by the device in embodiment 2.

[0116] Step 106: transmitting the incident light field as ciphertext of the information to be transmitted.

[0117] Embodiment 2

[0118] Figure 5 It is a device structure schematic diagram for transmitting information by using longitudinal light field provided by embodiment 2 of the application. As Figure 5 shown, in order to realize the method for transmitting information by using longitudinal light field in embodiment 1, the embodiment provides a device for transmitting information by using longitudinal light field, which comprises a laser generator 1, a horizontal polarization light generating module, an expansion lens combination, a spatial light modulator 7 loaded with a two-dimensional holographic grating corresponding to the information to be transmitted, a filtering module, a quarter-wave plate 10, a Ronchi grating 12, a tight focusing module, a beam splitter, a radial polarization converter 20, a polarization beam splitting module and a longitudinal detector.

[0119] The laser generator 1 is used for emitting linearly polarized light.

[0120] The horizontal polarization light generating module is arranged on the outgoing light path of the linearly polarized light, and is used for adjusting the light intensity of the linearly polarized light and converting the linearly polarized light with adjusted light intensity into horizontal polarization light. Specifically, the horizontal polarization light generating module comprises a half-wave plate 2 and a first polarization beam splitter 3.

[0121] The expansion lens combination is arranged on the outgoing light path of the horizontal polarization light, and is used for focusing and collimating the horizontal polarization light to obtain expanded horizontal polarization light. Specifically, the expansion lens combination comprises a first lens 4 and a second lens 5.

[0122] The spatial light modulator 7 is arranged on the light path of the expanded horizontal polarized light, and is configured to diffract the expanded horizontal polarized light to obtain diffracted horizontal polarized light.

[0123] The filtering module is arranged on the light path of the diffracted horizontal polarized light, and is configured to filter the diffracted horizontal polarized light to obtain diffracted horizontal polarized light; the diffracted horizontal polarized light includes first diffracted polarized light and second diffracted polarized light. Specifically, the filtering module includes a third lens 8 and a beam blocker 9.

[0124] The quarter-wave plate 10 is arranged on the light path of the diffracted horizontal polarized light, and is configured to adjust the first diffracted polarized light into left circular polarized light and the second diffracted polarized light into right circular polarized light.

[0125] The Ronchi grating 12 is arranged on the light path of the left circular polarized light and the right circular polarized light, and is configured to coherently superimpose the left circular polarized light and the right circular polarized light to generate an incident light field of the information to be transmitted.

[0126] The tight focusing module is configured to tightly focus the received incident light field to generate a tight focusing light field. Specifically, the function of the tight focusing module is realized by a first focusing objective 17.

[0127] The beam splitter is arranged on the light path of the tight focusing light field, and is configured to split the tight focusing light field to obtain a first tight focusing light field and a second tight focusing light field; the first tight focusing light field is a transverse component of the tight focusing light field, and the second tight focusing light field is a longitudinal component of the tight focusing light field. Figure 5 In specific embodiments, the beam splitter is a second beam splitter 19.

[0128] The radial polarization converter 20 is arranged on the light path of the second tight focusing light field, and is configured to divide the second tight focusing light field into a horizontal tight focusing light field and a vertical tight focusing light field.

[0129] The polarization beam splitting module is arranged on the light path of the horizontal tight focusing light field and the light path of the vertical tight focusing light field, and is configured to filter out the horizontal tight focusing light field; the light path of the horizontal tight focusing light field and the light path of the vertical tight focusing light field coincide. Figure 5 In specific embodiments, the polarization beam splitting module is a second polarization beam splitter 21.

[0130] The longitudinal detector is arranged on the light path of the vertical tight focusing light field after passing through the polarization beam splitting module, and is configured to receive the vertical tight focusing light field after filtering out the horizontal tight focusing light field to obtain the information to be transmitted. Figure 5 In specific embodiments, the longitudinal detector is a first light intensity detection camera 23.

[0131] Specifically, the above-mentioned part is an indispensable part of the method for transmitting information by using a longitudinal light field. In actual implementation, in order to facilitate operation, other auxiliary components are combined to complete the whole process. Figure 5 As shown in the figure, when the information to be transmitted is the Arabic numeral "5", at this time, the transmission of "5" is realized by using the device in Figure 5 The process is as follows:

[0132] The laser generator 1 emits linearly polarized light, the polarization direction of the linearly polarized light is changed by the half-wave plate 2, the light intensity of the linearly polarized light is adjusted by the combination of the half-wave plate 2 and the first polarization beam splitter 3, so that the horizontal polarized light is emitted; then it is focused by the first lens 4 in turn, and after collimation by the combination of the second lens 5, the beam expansion is completed, and the expanded horizontal polarized light is obtained; the expanded horizontal polarized light is reflected by the first beam splitter 6 and then is incident on the two-dimensional holographic grating corresponding to "5" loaded on the spatial light modulator, so that diffraction occurs, and the diffraction horizontal polarized light is obtained, the diffraction horizontal polarized light is transmitted by the first beam splitter 6 and then is incident on the third lens 8.

[0133] The diffraction horizontal polarized light is transmitted by the third lens 8 and then is incident on the beam stop 9 at the Fourier plane of the third lens 8, so that filtering is performed, only the two +1 order components (i.e. the first diffraction partial polarized light and the second diffraction partial polarized light) of the diffraction horizontal polarized light are reserved after filtering, and then the left-handed circular polarized light and the right-handed circular polarized light are generated by the adjustment of the quarter-wave plate 10, the left-handed circular polarized light and the right-handed circular polarized light are transmitted by the fourth lens 11 and then are incident on the Ronchi grating 12 at the back focal plane of the fourth lens 11, so that coherent superposition occurs, and the incident light field (the form on the Ronchi grating 12 is an image) of "5" is generated.

[0134] The incident light field (image) of "5" is sequentially incident on the front focal plane of the first focusing objective lens 17 through the first mirror 13, the fifth lens 14, the sixth lens 15 and the second mirror 16, and then is tightly focused by the first focusing objective lens 17 to generate a tightly focused light field. The transverse component and the longitudinal component of the tightly focused light field are collected and collimated by the second focusing objective lens 18, and then are equally intensity split by the second beam splitter 19, so that the transverse component and the longitudinal component of the tightly focused light field are obtained.

[0135] The longitudinal component of the tightly focused light field is converted into the horizontal tightly focused partial light field and the vertical tightly focused partial light field by the radial polarization converter 20, the horizontal tightly focused partial light field is filtered out by the second polarization beam splitter 21, and the seventh lens 22 is used, so that the first light intensity detection camera 23 only receives the vertical tightly focused partial light field, and "5" is obtained.

[0136] In addition to receiving "5" by using the longitudinal component of the tightly focused light field, the transverse component of the tightly focused light field can also be used for receiving, and after the transverse component of the tightly focused light field passes through the polarizer 24 to distinguish the horizontal component and the vertical component in the transverse component of the tightly focused light field, the transverse component of the tightly focused light field passes through the eighth lens 25 and is incident on the second light intensity detection camera 26, so as to realize the receiving of "5".

[0137] Embodiment 3

[0138] In order to realize the method for transmitting information by using the longitudinal light field in embodiment 1, the embodiment provides a system for transmitting information by using the longitudinal light field, comprising:

[0139] An initial information determination module is configured to determine self-Gaussian dot array information and hidden transverse field dot array information of the information to be transmitted, wherein the self-Gaussian dot array information comprises the total number of Gaussian dots in the self-Gaussian dot array, the horizontal coordinates of the Gaussian dots in the self-Gaussian dot array, the vertical coordinates of the Gaussian dots in the self-Gaussian dot array, and the beam waist of the self-Gaussian dot array; and the hidden transverse field dot array information comprises the total number of Gaussian dots in the hidden transverse field dot array, the horizontal coordinates of the Gaussian dots in the hidden transverse field dot array, the vertical coordinates of the Gaussian dots in the hidden transverse field dot array, and the beam waist of the hidden Gaussian dot array.

[0140] An initial longitudinal light field distribution determination module is configured to determine the initial longitudinal light field distribution of the information to be transmitted according to the Gaussian dot array information.

[0141] A transverse light field distribution determination module is configured to determine the transverse light field distribution of the information to be transmitted according to the initial longitudinal light field distribution and the hidden transverse field dot array information.

[0142] A target longitudinal light field distribution determination module is configured to determine the target longitudinal light field distribution of the information to be transmitted based on the initial longitudinal light field distribution and the transverse light field distribution.

[0143] An incident light field determination module is configured to determine the incident light field of the information to be transmitted based on the target longitudinal light field distribution by using inverse Fourier transform.

[0144] A transmission module is configured to transmit the incident light field as the ciphertext of the information to be transmitted.

[0145] Embodiment 4

[0146] An electronic device comprises a memory and a processor, the memory is configured to store a computer program, and the processor is configured to run the computer program to enable the electronic device to execute the method for transmitting information by using the longitudinal light field in embodiment 1.

[0147] As an optional implementation, the memory is a readable storage medium.

[0148] The various embodiments described in this specification are presented for the purpose of illustrating the principles of the application and its best mode of operation. Each of the embodiments described in this specification has different features, and each of the embodiments can be used independently of the other embodiments. The same elements have the same reference labels. The various embodiments disclosed herein can be combined in order to provide additional embodiments. For purposes of simplicity and clarity, the description of a particular feature or aspects of an embodiment can be used in most other embodiments. Such described features and aspects do not apply only to the particular embodiment that they were described with regard to, but apply to all embodiments described in this specification.

[0149] The principles and implementations of the present application have been described in the above embodiments, which are only used to help understand the method, device and core idea of the present application. Meanwhile, for those skilled in the art, the specific implementation and application range of the present application can be changed according to the idea of the present application. In summary, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A method for transmitting information using a longitudinal optical field, characterized in that, The method includes: The self-Gaussian lattice information and hidden transverse field lattice information of the information to be transmitted are determined. The self-Gaussian lattice information includes: the total number of Gaussian points in the self-Gaussian lattice, the horizontal coordinates of each Gaussian point in the self-Gaussian lattice, the vertical coordinates of each Gaussian point in the self-Gaussian lattice, and the beam waist of the self-Gaussian lattice. The hidden transverse field lattice information includes: the total number of Gaussian points in the hidden transverse field lattice, the horizontal coordinates of each Gaussian point in the hidden transverse field lattice, the vertical coordinates of each Gaussian point in the hidden transverse field lattice, and the hidden transverse field lattice beam waist. The beam waist of the Gaussian lattice is determined by the following: the total number of Gaussian points in the Gaussian lattice, the horizontal coordinates of each Gaussian point in the Gaussian lattice, and the vertical coordinates of each Gaussian point in the Gaussian lattice. The beam waist of the Gaussian lattice is set according to the actual situation. The hidden transverse field lattice is a lattice composed of Gaussian points required to supplement the Gaussian field lattice. The sum of the total number of Gaussian points in the Gaussian lattice and the total number of Gaussian points in the hidden transverse field lattice is a fixed value. The beam waist of the hidden Gaussian lattice is set according to the actual situation. The initial longitudinal light field distribution of the information to be transmitted is determined based on the Gaussian lattice information. Based on the initial longitudinal light field distribution and the hidden transverse field lattice information, the transverse light field distribution of the information to be transmitted is determined; Based on the initial longitudinal light field distribution and the transverse light field distribution, the target longitudinal light field distribution of the information to be transmitted is determined; Using inverse Fourier transform, the incident light field of the information to be transmitted is determined based on the longitudinal light field distribution of the target. The incident light field is transmitted as the ciphertext of the information to be transmitted.

2. The method for transmitting information using a longitudinal optical field according to claim 1, characterized in that, Based on the initial longitudinal light field distribution and the hidden transverse field lattice information, the transverse light field distribution of the information to be transmitted is determined, specifically including: Based on the initial longitudinal light field distribution, determine the initial transverse light field distribution of the information to be transmitted; Based on the hidden transverse field dot matrix information, determine the hidden transverse light field distribution of the information to be transmitted; The transverse light field distribution is determined based on the initial transverse light field distribution and the hidden transverse light field distribution.

3. The method for transmitting information using a longitudinal optical field according to claim 2, characterized in that, Based on the hidden transverse field dot matrix information, the hidden transverse light field distribution of the information to be transmitted is determined, specifically including: For any current Gaussian point in the hidden transverse field lattice: Calculate the radial coordinates of the current Gaussian point based on its horizontal and vertical coordinates; Calculate the rotation coordinates of the current Gaussian point based on its horizontal and vertical coordinates; The hidden transverse light field distribution is calculated based on the total number of Gaussian points in the hidden transverse field lattice, the radial coordinates of all Gaussian points in the hidden transverse field lattice, the rotational coordinates of all Gaussian points in the hidden transverse field lattice, and the beam waist of the Gaussian lattice beam itself.

4. The method for transmitting information using a longitudinal optical field according to claim 1, characterized in that, Based on the initial longitudinal light field distribution and the transverse light field distribution, the target longitudinal light field distribution of the information to be transmitted is determined, specifically including: The total spectrum is determined based on the spectrum of the initial longitudinal light field distribution and the spectrum of the transverse light field distribution; Determine the numerical aperture and preset free space wavenumber of the focusing objective during the tight focusing process; The spectral spatial filtering function is determined based on the numerical aperture and the free space wavenumber. The total spectrum is filtered using the aforementioned spectral space filtering function to obtain the filtered total spectrum. The longitudinal optical field distribution of the target is obtained by performing an inverse Fourier transform on the filtered total spectrum.

5. The method for transmitting information using a longitudinal optical field according to claim 4, characterized in that, Using the inverse Fourier transform, the incident light field of the information to be transmitted is determined based on the longitudinal light field distribution of the target, specifically including: Determine the focal length of the focusing objective and the coordinate transformation matrix during the focusing process; The incident light field is determined by using the inverse Fourier transform based on the focal length, the coordinate transformation matrix, and the spectrum of the longitudinal light field distribution of the target.

6. An apparatus for transmitting information using a longitudinal optical field, used to implement the method for transmitting information using a longitudinal optical field as described in any one of claims 1-5, characterized in that, The device includes: a laser generator, a horizontally polarized light generation module, a beam expander lens assembly, a spatial light modulator loaded with a two-dimensional holographic grating corresponding to the information to be transmitted, a filter module, a quarter-wave plate, a Ronche grating, a tight-focusing module, a beam splitter, a radial polarization converter, a polarization beam splitter module, and a longitudinal detector. The laser generator is used to emit linearly polarized light; The horizontally polarized light generating module is disposed in the output light path of the linearly polarized light and is used to adjust the light intensity of the linearly polarized light and convert the linearly polarized light after adjusting the light intensity into horizontally polarized light. The beam-expanding lens assembly is disposed in the output light path of the horizontally polarized light to focus and collimate the horizontally polarized light to obtain expanded horizontally polarized light. The spatial light modulator is disposed in the output light path of the expanded horizontally polarized light and is used to diffract the expanded horizontally polarized light to obtain diffracted horizontally polarized light. The filtering module is disposed in the outgoing light path of the horizontally polarized diffracted light and is used to filter the horizontally polarized diffracted light to obtain horizontally polarized diffracted light; the horizontally polarized diffracted light includes a first diffracted light and a second diffracted light. The quarter-wave plate is disposed in the output light path of the horizontally polarized diffracted light and is used to adjust the first diffracted polarized light into left-handed circularly polarized light and the second diffracted polarized light into right-handed circularly polarized light. The Ronchi grating is disposed in the outgoing light path of the left-hand circularly polarized light and the right-hand circularly polarized light, and is used to coherently superimpose the left-hand circularly polarized light and the right-hand circularly polarized light to generate the incident light field of the information to be transmitted. The tight-focusing module tightly focuses the received incident light field to generate a tightly focused light field; The beam splitter is disposed on the outgoing light path of the tightly focused light field and is used to split the tightly focused light field into a first tightly focused beam splitting field and a second tightly focused beam splitting field; the first tightly focused beam splitting field is the transverse component of the tightly focused light field, and the second tightly focused beam splitting field is the longitudinal component of the tightly focused light field. The radial polarization converter is disposed in the output light path of the second tightly focused beam splitting field and is used to split the second tightly focused beam splitting field into a horizontal tightly focused beam splitting field and a vertical tightly focused beam splitting field; The polarization beam splitter module is disposed on the output optical path of the horizontal tightly focused beam splitter and the output optical path of the vertical tightly focused beam splitter, and is used to filter out the horizontal tightly focused beam splitter; the output optical path of the horizontal tightly focused beam splitter and the output optical path of the vertical tightly focused beam splitter coincide. The longitudinal detector is positioned on the outgoing light path of the vertically tightly focused beam splitting field after passing through the polarization beam splitting module, and is used to receive the vertically tightly focused beam splitting field after filtering out the horizontal tightly focused beam splitting field, thereby obtaining the information to be transmitted.

7. A system for transmitting information using a longitudinal optical field, characterized in that, The system includes: The initial information determination module is used to determine the self-Gaussian lattice information and hidden transverse field lattice information of the information to be transmitted; the self-Gaussian lattice information includes: the total number of Gaussian points in the self-Gaussian lattice, the horizontal coordinates of each Gaussian point in the self-Gaussian lattice, the vertical coordinates of each Gaussian point in the self-Gaussian lattice, and the beam waist of the self-Gaussian lattice; the hidden transverse field lattice information includes: the total number of Gaussian points in the hidden transverse field lattice, the horizontal coordinates of each Gaussian point in the hidden transverse field lattice, the vertical coordinates of each Gaussian point in the hidden transverse field lattice, and the beam waist of the hidden Gaussian lattice. An initial longitudinal light field distribution determination module is used to determine the initial longitudinal light field distribution of the information to be transmitted based on the Gaussian dot matrix information. The transverse light field distribution determination module is used to determine the transverse light field distribution of the information to be transmitted based on the initial longitudinal light field distribution and the hidden transverse field dot matrix information. The target longitudinal light field distribution determination module is used to determine the target longitudinal light field distribution of the information to be transmitted based on the initial longitudinal light field distribution and the transverse light field distribution. An incident light field determination module is used to determine the incident light field of the information to be transmitted based on the longitudinal light field distribution of the target using inverse Fourier transform. The transmission module is used to transmit the incident light field as encrypted information to be transmitted.

8. An electronic device, characterized in that, The device includes a memory and a processor, the memory being used to store a computer program, and the processor running the computer program to cause the electronic device to perform a method for transmitting information using a longitudinal light field as described in any one of claims 1 to 5.

9. An electronic device according to claim 8, characterized in that, The memory is a readable storage medium.

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