Design method of airy beam generator based on r-t same amplitude modulation superstructure surface

Abstract

The application discloses an Airy beam generator design method based on an R-T amplitude-same-phase modulation superstructure surface, and belongs to the field of the Airy beam generator. The method comprises the following steps: designing and realizing an R-T superstructure unit for independently regulating and controlling amplitude and phase; setting the size of the superstructure surface; arranging the R-T superstructure unit according to the size of the superstructure surface to obtain an amplitude-same-phase modulation superstructure surface; obtaining the structural distribution of the Airy beam according to the relationship between the amplitude-same-phase distribution of the amplitude-same-phase modulation superstructure surface and the rotation angle in the Airy beam generation; and performing receiving antenna side processing and transmitting antenna side processing according to the structural distribution of the Airy beam to obtain the Airy beam generator. The application solves the problems of the traditional Airy beam generator, such as complex structure, low efficiency and difficulty in system integration.

Description

Technical Field

[0001] This invention belongs to the field of Airy beam generators, and particularly relates to a design method for an Airy beam generator based on an RT amplitude isomodulation metasurface. Background Technology

[0002] During light wave propagation, diffraction causes the beam to diverge, making the realization of diffraction-free beams a long-standing research hotspot in optics. In 1979, the unique diffraction-free solution to the one-dimensional Schrödinger equation, the Airy packet, was discovered while solving the Schrödinger equation. However, due to its diffraction-free characteristic, it possesses infinite energy, making it impossible to obtain experimentally. Meanwhile, the diffraction-free, self-healing, and lateral self-bending properties of Airy beams are highly suitable for applications in optical manipulation, optical trapping, and plasma channels, but their application stagnated because they could not be obtained experimentally. Until 2007, by using the apodization method, an Airy function solution satisfying the one-dimensional Schrödinger equation was obtained, leading to the first experimental generation of a finite-energy Airy beam. Since then, research on Airy beams has flourished, becoming a current research hotspot in optics. Traditional methods for generating Airy beams mainly utilize spatial light modulators and Fourier transform lenses, or Fourier transform planes and Fourier transform lenses. These methods require large equipment and are quite complex, so it is necessary to improve upon them.

[0003] Due to their powerful electromagnetic wavefront manipulation capabilities, metasurfaces are increasingly being used to generate Airy beams. In 2016, Airy beams were achieved in the optical frequency band based on nanoscale metal rod-shaped metasurfaces. However, the aforementioned Airy beam generators are all based on traditional fabrication methods, which suffer from drawbacks such as complex design and low portability. Summary of the Invention

[0004] To address the aforementioned shortcomings in existing technologies, this invention provides a design method for an Airy beam generator based on an RT amplitude isomodulation metasurface, which solves the problems of complex structure, low efficiency, and difficulty in system integration of traditional Airy beam generators.

[0005] To achieve the aforementioned objectives, the present invention employs the following technical solution: a design method for an Airy beam generator based on an RT amplitude isomodulation metasurface, comprising the following steps:

[0006] S1. Design and implement RT meta-units with independent amplitude-phase control;

[0007] S2. Set the dimensions of the metasurface;

[0008] S3. Arrange the RT meta-units according to the size of the meta-surface to obtain an amplitude-isohybrid meta-surface;

[0009] S4. Based on the relationship between the amplitude-phase distribution and the rotation angle of the mid-amplitude isotropic metasurface generated by the Airy beam, the structural distribution of the Airy beam is obtained.

[0010] S5. Based on the structural distribution of the Airy beam, perform processing on the receiving antenna side and the transmitting antenna side to obtain the Airy beam generator.

[0011] Furthermore, in step S1, the RT metastructure unit includes a second dielectric plate, a metal floor layer, and a first dielectric plate connected sequentially from top to bottom; both the first dielectric plate and the second dielectric plate are made of F4B board.

[0012] Furthermore, a hollow metal connecting post protrudes downward at the center of the lower surface of the second dielectric plate; a hollow metal connecting post protrudes upward at the center of the upper surface of the first dielectric plate; a circular hole is provided at the center of the metal floor layer; the metal floor layer is formed by inserting a section of solid metal connecting post through the circular hole into the metal connecting post of the first dielectric plate and the metal connecting post of the second dielectric plate respectively; the diameter of the circular hole is larger than the diameter of the metal connecting post.

[0013] Furthermore, a receiving antenna structure with a length of l and a width of w is disposed on the upper surface of the second dielectric substrate; a concave hollow is disposed in the middle of the receiving antenna structure; the length and width of the concave hollow are l and w respectively. g and w g The length of the concave, hollowed-out square is d. l Width is d w .

[0014] Furthermore, a transmitting antenna structure is provided on the lower surface of the first dielectric substrate; the transmitting antenna structure and the receiving antenna structure are identical; both the receiving antenna structure and the transmitting antenna structure are metal sheets.

[0015] Furthermore, the concave cutout in the middle of the receiving antenna structure is recessed in the opposite direction of the X-axis; the concave cutout in the middle of the transmitting antenna structure is recessed in the opposite direction of the Y-axis.

[0016] Furthermore, the receiving antenna structure is a patch antenna for receiving or transmitting y-polarized waves; the transmitting antenna structure is a patch antenna for receiving or transmitting x-polarized waves.

[0017] Furthermore, in step S3, the size of the isotropic metasurface is N×N, and the metasurface is composed of N / 30×N / 30 RT metasurface units.

[0018] Furthermore, in step S4, the amplitude-phase distribution of the Airy beam-generated isotropic metasurface satisfies the Airy beam distribution:

[0019] f(x',0)=Ai(x' / w0)·exp(ax' / w0)

[0020] Where f(x',0) is the Airy beam distribution; x' is the beam propagation distance in the beam propagation direction; Ai is the Airy function; a is the truncation factor; and w0 is the scaling length.

[0021] The beneficial effects of this invention are as follows: Based on a novel RT meta-unit Airy beam generator, this invention experimentally verifies its non-diffraction characteristics, lateral self-bending acceleration characteristics, and self-healing characteristics, and it has high working efficiency, providing a new research idea for the development of high-efficiency amplitude iso-modulation meta-devices. Attached Figure Description

[0022] Figure 1 This is a flowchart of the method of the present invention.

[0023] Figure 2 This is a schematic diagram of a novel amplitude and phase modulation unit based on an RT unit and a schematic diagram of receiver characteristics in an embodiment of the present invention.

[0024] Figure 3 This is a schematic diagram illustrating the characteristics of the novel amplitude and phase modulation unit Transmitter based on the RT unit and the transmission characteristics of the integrated unit in an embodiment of the present invention.

[0025] Figure 4 This is a schematic diagram of the design of a one-dimensional Airy beam generator in an embodiment of the present invention.

[0026] Figure 5 This is a schematic diagram of the electromagnetic performance of a one-dimensional Airy beam generator in an embodiment of the present invention.

[0027] in, Figure 2 (a) shows the bottom view, three-dimensional exploded view and top view of the new amplitude and phase control unit; Figure 2 (b) is a diagram showing the reflection coefficient and port transmission coefficient of the receiving antenna; Figure 2 (c) is a graph showing the transmission coefficient from Port 1 to Port 2 as a function of the rotation angle α of the receiving antenna Receiver Patch 1; Figure 2 (d) is a graph showing the transmission phase from Port 1 to Port 2 as a function of the rotation angle α of the receiving antenna Receiver Patch 1; Figure 2 (e) represents the theoretical value of transmission amplitude cosα and the normalized simulation value t. 21 A comparison chart; Figure 3 (a) is a graph showing the transmission coefficient from Port 2 to Port 3 as a function of the rotation angle β of the TransmitterPatch 2. Figure 3(b) is a graph showing the transmission phase from Port 2 to Port 3 as a function of the rotation angle β of the Transmitter Patch 2. Figure 3 (c) is a graph showing the relationship between the transmission coefficients from Port 1 to Port 3 and the rotation angles α and β; Figure 3 (d) is a graph showing the relationship between the transmission phase from Port 1 to Port 3 and the rotation angles α and β; Figure 4 (a) is a schematic diagram of the amplitude of a one-dimensional Airy beam; Figure 4 (b) is a phase distribution diagram of a one-dimensional Airy beam; Figure 4 (c) is a schematic diagram of the rotation angle of the receiving antenna of the RT element in one-dimensional Airy beam generation; Figure 4 (d) is a schematic diagram of the rotation angle of the transmitting antenna of the RT element in one-dimensional Airy beam generation; Figure 4 (e) is a schematic diagram of the sample fabricated on the receiving antenna side; Figure 4 (f) is a schematic diagram of the sample fabricated on the transmitting antenna side; Figure 5 (a) is a schematic diagram of the principle of near-field measurement; Figure 5 (b) is a diagram of the near-field testing setup for the Airy beam; Figure 5 (c) is a schematic diagram of the amplitude distribution of the transmissive Airy beam generator in the xoz plane at 10 GHz. Figure 5 (d) is a schematic diagram of the amplitude distribution of the transmissive Airy beam generator in the xoz plane at 10 GHz. Figure 5 (e) is a schematic diagram of the amplitude distribution after the main beam is blocked in the simulation; Figure 5 (f) is a schematic diagram of the efficiency of a one-dimensional Airy beam in simulation and testing. Detailed Implementation

[0028] The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0029] like Figure 1 As shown, in one embodiment of the present invention, a design method for an Airy beam generator based on an RT amplitude isomodulation metasurface includes the following steps:

[0030] S1. Design and implement RT meta-units with independent amplitude-phase control;

[0031] S2. Set the dimensions of the metasurface;

[0032] S3. Arrange the RT meta-units according to the size of the meta-surface to obtain an amplitude-isohybrid meta-surface;

[0033] S4. Based on the relationship between the amplitude-phase distribution and the rotation angle of the mid-amplitude isotropic metasurface generated by the Airy beam, the structural distribution of the Airy beam is obtained.

[0034] S5. Based on the structural distribution of the Airy beam, perform processing on the receiving antenna side and the transmitting antenna side to obtain the Airy beam generator.

[0035] In this embodiment, a novel RT meta-unit was designed. The rotational characteristics of the receiving antenna were used to achieve arbitrary amplitude modulation of the transmitted beam, and the rotational characteristics of the transmitting antenna were used to achieve phase modulation of the transmitted beam, thus enabling independent amplitude-phase modulation of the transmitted beam. An Airy beam generator based on the novel RT meta-unit was experimentally verified to possess diffraction-free characteristics, lateral self-bending acceleration characteristics, and self-healing characteristics, and also exhibits high operating efficiency. This provides a new research approach for the development of high-efficiency amplitude-isomodulation meta-devices.

[0036] In this embodiment, an Airy beam is designed using a metasurface. Essentially, this involves ensuring that the amplitude and phase on the metasurface satisfy the Airy beam distribution f(x',0)=Ai(x' / w0)·exp(ax' / w0), where x' is the beam propagation distance in the beam propagation direction, Ai is the Airy function, a is the truncation factor, and w0 is the scaling length. When Ai<0, the phase of the metasurface is π; when Ai>0, the phase is 0, while the amplitude varies arbitrarily between 0 and 1. Therefore, the key to generating an Airy beam lies in designing a metasurface with independently adjustable amplitude and phase.

[0037] like Figure 2 As shown, in step S1, the RT metastructure unit includes a second dielectric plate, a metal floor layer, and a first dielectric plate connected sequentially from top to bottom; both the first dielectric plate and the second dielectric plate are made of F4B board.

[0038] A hollow metal connecting post protrudes downward at the center of the lower surface of the second dielectric plate; a hollow metal connecting post protrudes upward at the center of the upper surface of the first dielectric plate; a circular hole is provided in the center of the metal floor layer; the metal floor layer is formed by a section of solid metal connecting post inserted into the metal connecting post of the first dielectric plate and the metal connecting post of the second dielectric plate through the circular hole; the diameter of the circular hole is larger than the diameter of the metal connecting post.

[0039] The upper surface of the second dielectric substrate is provided with a receiving antenna structure of length l and width w; a concave hollow is provided in the middle of the receiving antenna structure; the length and width of the concave hollow are l and w respectively. g and w gThe length of the concave, hollowed-out square is d. l Width is d w .

[0040] The lower surface of the first dielectric substrate is provided with a transmitting antenna structure; the transmitting antenna structure and the receiving antenna structure are the same; both the receiving antenna structure and the transmitting antenna structure are metal sheets.

[0041] The concave cutout in the middle of the receiving antenna structure is recessed in the opposite direction of the X-axis; the concave cutout in the middle of the transmitting antenna structure is recessed in the opposite direction of the Y-axis.

[0042] The receiving antenna structure is a patch antenna for receiving or transmitting y-polarized waves; the transmitting antenna structure is a patch antenna for receiving or transmitting x-polarized waves.

[0043] In step S3, the size of the isotropic metasurface is N mm × N mm, and the metasurface is composed of N / 30 × N / 30 RT metasurface units.

[0044] In step S4, the amplitude-phase distribution of the Airy beam-generated isotropic metasurface satisfies the Airy beam distribution:

[0045] f(x',0)=Ai(x' / w0)·exp(ax' / w0)

[0046] Where f(x',0) is the Airy beam distribution; x' is the beam propagation distance in the beam propagation direction; Ai is the Airy function; a is the truncation factor; and w0 is the scaling length.

[0047] In this embodiment, it is assumed that the incident y-polarized electromagnetic wave is incident on the receiving antenna along the +z axis, and the electric field E of the incident wave is... i1 It can be represented as E i1 =E0ye -jkz 'e -jωt (Where, E0 is the amplitude of the incident wave electric field; y is the electric field polarization direction; e is the natural constant; j is the imaginary number; k is the electromagnetic wave vector; z' is the Z-axis coordinate; ω is the angular velocity; t is time), according to antenna theory, the incident wave E received by the receiving antenna Receiver Patch 1 is... r1 The electric field can be expressed as Where Φ p Let E be the transmission phase of the electromagnetic wave from the radiation source to the receiving antenna. When the receiving antenna Receiver Patch 1 rotates clockwise by an angle α, since the receiving antenna is a single-wire polarized patch antenna, only energy in the polarization direction can be received. Therefore, the electric field E of the electromagnetic wave that can be received by Receiver Patch 1 is... r2 It can be represented as Therefore, the amplitude of the received signal can vary arbitrarily with α, while the transmission phase remains constant. At this point, by introducing the transmitting antenna Patch 2, the amplitude and phase of the emitted electromagnetic wave will be further modulated when the transmitting antenna rotates by an angle β. At this time, when β = 0° and 180°, the transmission amplitude remains unchanged, while the phase varies between 0 and π, satisfying the requirements for generating an Airy beam.

[0048] To verify the effectiveness of the metasurface in simultaneously and independently controlling amplitude and phase, the designed metaunit is shown below. Figure 2 (a) The unit is composed of three layers of metal and two layers of dielectric substrates stacked together. The first dielectric substrate sub1 and the second dielectric substrate sub2 are F4B (dielectric constant ε). r =2.65, loss tangent δ = 0.003, thickness h s =1.524mm). The receiver patch 1 is a patch antenna capable of receiving / transmitting y-polarized waves, and the transmitter patch 2 is a patch antenna capable of receiving / transmitting x-polarized waves. Patch 1 and Patch 2 have identical geometric dimensions; Patch 2 can be obtained by rotating Patch 1 by 90°. The rotation angle of Patch 1 is denoted as α, and the rotation angle of Patch 2 is denoted as β. When the incident wave is y-polarized, it is received by the receiver patch 1, which converts the received spatial wave into a guided wave, which is then transmitted to the transmitter patch 2 through a metallized via. Finally, the transmitter converts the guided wave back into a spatial wave and radiates it, thus achieving the transmission of the transmitted wave. Figure 2 In (a), x is the X-axis; y is the Y-axis; z is the Z-axis; p is the cell period; Port 1 is the first dielectric plate; Port 2 (Waveguide port) is the metal ground plane; Port 3 is the second dielectric plate; and via-hole is a circular hole.

[0049] First, verify the arbitrary amplitude control of the receiving antenna structure Patch 1. For example... Figure 2 As shown in (b), the simulated antenna reflection coefficient S is obtained near the operating frequency of 10 GHz. 22 Less than -15dB, while the antenna's transmission coefficient S 12The amplitude is approximately 0dB, perfectly verifying that the designed receiving antenna structure Patch 1 can receive / transmit y-polarized waves with an amplitude close to 1, making it very suitable for use as a receiving antenna for RT units. The receiving transmission characteristics when receiving antenna structure Patch 1 is rotated by α are shown in the figure. Figure 2 (c). When the rotation angle α takes values ​​at 15° intervals within the range of 0° to 90°, the transmission coefficient t of the receiving antenna structure from port 1 to port 2 is obtained near the operating frequency of 10GHz. 21 It can take any value within the range of 0 to 1, which matches the range of cosα (0°≤α≤90°), see [reference]. Figure 2 (e). Next, we analyze the effect of the receiving antenna structure Patch 1 on the transmission phase. When the receiving antenna structure Patch 1 is rotated, the transmission phase difference remains basically unchanged, see... Figure 2 (d) When the rotation angle α is 90°, the corresponding transmission coefficient is basically 0, which can be regarded as no energy is transmitted. At this time, although the phase jumps, it has no effect on the transmission characteristics. Figure 2 (d) Normalized Sim.t 21 For t 21 Standardized data. Figure 2 The structural parameters of the middle unit are as follows: unit period p = 10mm, outer width w = 7mm, outer length l = 6.5mm, inner width w g =5mm, outer length l g = 4.5mm, the geometric dimensions of the inner rectangle are: inner rectangle width d w =1.5mm, length d of the inner rectangle l = 3.25mm. Diameter d of the metallized through-hole. v =0.7mm, the diameter of the circular hole on the metal floor is d h =1.7mm.

[0050] Next, the effect of the transmit antenna structure Patch 2 on the transmission phase is analyzed. Since Patch 2 has the same geometry as Patch 1, only rotated by 90°, the transmit antenna can transmit x-polarized waves near 10 GHz. Simulations were performed with the rotation angle β of the transmit antenna structure set to 0° and 180° respectively. The transmission amplitude and transmission phase from Port 2 to Port 3 are shown below. Figure 3 As shown in (a) and 3(b), the transmission amplitude remains essentially constant near 10 GHz, and the phase maintains a 180° phase difference across the 9-11 GHz range. Combining the receiving and transmitting antennas, this forms the designed RT meta-unit ( Figure 2(a)). During the simulation, the range of the receiving antenna rotation angle α was set to [0°, 90°] with a value interval of 15°, and the transmitting antenna rotation angle β was set to 0° and 180° respectively. Figure 3 (c) represents the transmission coefficient t from Port 1 to Port 3. 31 The relationship between the rotation angles α and β shows that the rotating receiving antenna can achieve continuous modulation of the transmitted wave amplitude from 0 to 1, and the modulation relationship satisfies t 31 =cosα; at the same time, the transmitting antenna has almost no effect on the amplitude of the transmitted wave when rotating at 0° and 180°. Figure 3 (d) represents the transmission phase Φ from Port 1 to Port 3. m31 The relationship between rotation angles α and β reveals that changing the rotation angle α of the receiving antenna has virtually no effect on the phase of the transmitted wave, while changing the rotation angle β of the transmitting antenna can achieve a 180° phase difference, thus enabling control over the phase of the transmitted wave. In summary, the designed novel RT unit can perfectly convert y-polarized incident light into x-polarized transmitted light, while allowing continuous adjustment of the transmitted wave amplitude from 0 to 1 and control over the phase of the transmitted wave from 0 to 180°. This characteristic is advantageous for designing Airy beam generators.

[0051] Based on the Airy beam equation, the cutoff factor a and scaling length w0 are set to a = 0.04 and w0 = 0.026, respectively. The amplitude and phase distribution of the plotted Airy beam are shown below. Figure 4 (a) and Figure 4 (b) In the metasurface-based design, since the element period p = 10 mm, the amplitude and phase distributions after discretization are shown by the blue dots in the figure. The metasurface size is set to 300 mm × 300 mm, and the metasurface is composed of 30 × 30 RT elements. Based on the relationship between the amplitude-phase distribution and the rotation angle of the metasurface, the structural distribution of the metasurface can be extracted, and it can be processed. The sample is shown in [figure missing]. Figure 4 (e) and Figure 4 (f), the corresponding rotation angles of the receiving antenna and transmitting antenna are shown in [reference]. Figure 4 (c) and Figure 4 (d). As an extension, a two-dimensional Airy beam generator can also be designed with the following amplitude and phase distribution: f(x2',y2',0)=Ai(x2' / w1)·Ai(y2' / w2)·exp(ax2' / w1)·exp(ay2' / w2), where w1 and w2 are the scaling lengths; x2' is the beam propagation distance on the X-axis; and y2' is the beam propagation distance on the Y-axis. Figure 4 In the text, "Digitization" refers to discretized data; "Continuous" refers to continuous data; and "position x" represents the beam propagation position of the one-dimensional Airy beam generator on the X-axis.

[0052] Next, we will verify the operating characteristics of the one-dimensional Airy beam generator. Since a transmission-type Airy beam generator was designed, when testing the near-field distribution of the transmitted wave, due to the small sample size, the incident wave would typically diffract through the metasurface into the transmitted wave, causing interference. However, the designed RT unit can precisely convert the incident y-polarized wave into a cross-polarized wave, theoretically completely isolated from the incident wave. Therefore, the influence of the diffracted wave on the transmitted wave can be ignored; only the orthogonally polarized wave component of the transmitted wave needs to be considered. This removes the obstacle to simulating and testing the diffraction-free characteristics, self-healing characteristics, and lateral self-bending characteristics of the Airy beam generator.

[0053] Based on the simulated amplitude distribution of the x-polarized transmitted wave in the xoz plane at 10 GHz, it can be seen that the transmitted wave exhibits significant transverse self-bending acceleration characteristics, thus preliminarily verifying the generation of the Airy beam. (See...) Figure 5 (c) Next, near-field measurements were performed on the fabricated sample in a microwave anechoic chamber. A standard gain horn was used as a feed source and placed 2m away from the Airy beam generator to simulate the effect of plane wave illumination. A coaxial probe was used to collect the transmitted signal at the transmission end. The feed source and coaxial probe were connected to two ports of a vector network analyzer (AV3672B), respectively. See [link to relevant documentation]. Figure 5 (a) and Figure 5 (b). By Figure 5 (d) It can be seen that the simulation and test results are in good agreement, and the transmitted waves all have the transverse self-bending acceleration characteristics of the Airy beam.

[0054] After verifying the transverse self-bending acceleration characteristics of the Airy beam, simulations were conducted to verify its self-healing characteristics. Based on the verification of the transverse self-bending acceleration characteristics, a metal block was placed along the propagation direction of the main beam of the Airy beam, with its position coordinates (x, z) at (0 mm, 70 mm). Observation shows that after the main beam is blocked, the Airy beam recovers its original shape after propagating a certain distance, effectively demonstrating the self-healing characteristics of the Airy beam. (See...) Figure 5 (e) Finally, the diffraction-free characteristics of the Airy beam were also verified. Specifically, the diffraction-free characteristic manifests as the optical field profile remaining unchanged during the propagation of the Airy beam. Observation revealed that the normalized simulation and test results agree well, and are consistent with… Figure 4 The theoretical values ​​shown in (a) match well, strongly demonstrating the diffraction-free characteristics of the Airy beam. The above analysis qualitatively proves the diffraction-free characteristics of the Airy beam; generally, the half-power beamwidth of the main beam is used to quantitatively describe these characteristics. Among these, Figure 5 (f) shows that the simulated and tested main beam half-power beamwidths at z = 100 mm are 35 mm and 33 mm, respectively, which match well. Meanwhile, Figure 4(a) The theoretical design value given at z = 0 mm corresponds to a half-power beamwidth of 33 mm. This means that the Airy beam still maintains a relatively consistent half-power beamwidth after propagating from z = 0 mm to z = 100 mm, which strongly proves the non-diffraction characteristics of the Airy beam.

Claims

1. A method for designing an Airy beam generator based on R-T identical tuning superlattices, characterized in that, Includes the following steps: S1. Design and implement an RT meta-unit with independent amplitude-phase control; utilize the rotation characteristics of the receiving antenna to achieve arbitrary amplitude control of the transmitted beam, and utilize the rotation characteristics of the transmitting antenna to achieve phase control of the transmitted beam; the receiving antenna structure has a concave cutout in the middle; the length and width of the concave cutout are respectively... and The length of the concave, hollowed-out square is... , width is The transmitting antenna structure and the receiving antenna structure are the same; the concave cutout in the middle of the receiving antenna structure is recessed in the opposite direction to the Y-axis; the concave cutout in the middle of the transmitting antenna structure is recessed in the opposite direction to the X-axis; the receiving antenna is a single-line polarized patch antenna, and when rotated clockwise... When the angle is 90°, the energy of the received Y-polarized wave is 0; the rotation angle of the transmitting antenna is 0° or 180°; the rotation angle is determined based on the initial state. The initial state of the receiving antenna is that the concave hollow in the middle of the structure is concave in the opposite direction of the Y axis, and the initial state of the transmitting antenna is that the concave hollow in the middle of the structure is concave in the opposite direction of the X axis. S2. Set the dimensions of the metasurface; S3. Arrange the RT meta-units according to the size of the meta-surface to obtain an amplitude-isohybrid meta-surface; S4. Based on the relationship between the amplitude-phase distribution and the rotation angle of the mid-amplitude isotropic metasurface generated by the Airy beam, the structural distribution of the Airy beam is obtained. S5. Based on the structural distribution of the Airy beam, perform processing on the receiving antenna side and the transmitting antenna side to obtain the Airy beam generator.

2. The method of claim 1, wherein the R-T based metasurface is designed to have the same phase. In step S1, the RT metastructure unit includes a second dielectric plate, a metal floor layer, and a first dielectric plate connected sequentially from top to bottom; both the first dielectric plate and the second dielectric plate are made of F4B board.

3. The method of claim 2, wherein the R-T based metasurface is designed to have the same phase. A hollow metal connecting post protrudes downward at the center of the lower surface of the second dielectric plate; a hollow metal connecting post protrudes upward at the center of the upper surface of the first dielectric plate; a circular hole is provided in the center of the metal floor layer; the metal floor layer is formed by a section of solid metal connecting post inserted into the metal connecting post of the first dielectric plate and the metal connecting post of the second dielectric plate through the circular hole; the diameter of the circular hole is larger than the diameter of the metal connecting post.

4. The method of claim 2, wherein the R-T based metasurface is designed to have the same phase. The upper surface of the second dielectric plate is provided with a length of , width is The receiving antenna structure; the receiving antenna structure has a concave hollow in the middle; the length and width of the concave hollow are respectively... and The length of the concave, hollowed-out square is... , width is .

5. The method of claim 4, wherein the R-T based metasurface is designed to have the same phase. The lower surface of the first dielectric substrate is provided with a transmitting antenna structure; the transmitting antenna structure and the receiving antenna structure are the same; both the receiving antenna structure and the transmitting antenna structure are metal sheets.

6. The method of claim 1, wherein the R-T based metasurface is designed to have the same phase. The receiving antenna structure is a patch antenna for receiving or transmitting polarized waves; the transmitting antenna structure is a patch antenna for receiving or transmitting polarized waves.

7. The method of claim 1, wherein the R-T based metasurface is designed to have the same phase. The step S3 is to adjust the size of the metasurface according to the amplitude The metasurface is composed of R-T metasurface units. ​ 8. The method of claim 1, wherein the R-T based metasurface is designed to produce an Airy beam. In step S4, the amplitude-phase distribution of the Airy beam-generated isotropic metasurface satisfies the Airy beam distribution: wherein, is an Airy beam profile; is a beam propagation distance in the beam propagation direction; is an Airy function; is a truncation factor; is a scaling length.

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