Huygens-metasurface-based transparent transmission unit and manufacturing method therefor, and huygens-metasurface-based transparent transmission array

Abstract

Disclosed in the present application are a Huygens-metasurface-based transparent transmission unit and a manufacturing method therefor, and a Huygens-metasurface-based transparent transmission array. The unit comprises intermediate dielectric layers, a first metal layer, and a second metal layer. The array comprises a plurality of Huygens-metasurface-based transparent transmission units that are arranged in a rectangular layout. The method comprises: on the basis of the generalized Snell's Law, determining the phase distribution of a Huygens metasurface unit, and adjusting parameters of a double-arc structure, so as to obtain double-arc structure parameters; on the basis of the structure parameters, manufacturing metal layers and performing etching to make the metal layers form on surfaces of PET layers; and positioning a target on each PET layer, and by means of an optically clear adhesive, bonding onto glass the PET layers with the metal layers, so as to manufacture a transparent transmission unit. The embodiments of the present application can achieve high transmittance of electromagnetic waves and achieve easy deployment on existing windows, and extend the wireless-signal reception range in specific areas. The Huygens-metasurface-based transparent transmission unit and the manufacturing method therefor, and the Huygens-metasurface-based transparent transmission array, as provided in the present application, can be widely applied in the technical field of electromagnetic metasurfaces.

Description

Transparent transmission unit, array based on Huygens metasurface and preparation method thereof TECHNICAL FIELD

[0001] The present application relates to the technical field of electromagnetic metasurface, and particularly relates to a transparent transmission unit, array based on Huygens metasurface and a preparation method thereof. BACKGROUND

[0002] A metasurface is composed of periodically arranged artificial subwavelength unit structures and can flexibly manipulate electromagnetic waves. In the related art, opaque printed circuit boards and copper patches are used to manufacture metasurfaces. Such a design is difficult to integrate into urban environments or indoor layouts, destroys the overall aesthetics, and limits the deployment location of the metasurface, especially cannot be applied to glass windows. In order to manufacture a transparent metasurface, transparent conductive materials need to be used. However, transparent conductive materials usually sacrifice part of the conductive performance for high transparency, so it is difficult to realize a transparent metasurface with both high light transmittance and low electromagnetic wave loss.

[0003] Metasurfaces are divided into reflective and transmissive types. A reflective metasurface can achieve low electromagnetic wave loss and 360° phase control through a single-layer structure. However, a transmissive metasurface usually needs a multi-layer structure to achieve 360° transmissive phase control, which increases the difficulty of miniaturization and processing. In particular, for a transparent metasurface, the multi-layer structure significantly reduces the light transmittance, making it difficult to be deployed on existing windows.

[0004] Huygens metasurfaces have attracted widespread attention due to their ability to control electromagnetic waves by simultaneously generating electric and magnetic dipoles. There are two common Huygens metasurface unit structures today: one is a line-ring structure that directly uses a metal wire patch as an electric dipole and a metal ring as a magnetic dipole. This structure needs to cut the dielectric and stack it together in a "fence" style, which is difficult to deploy on existing windows. The other is a multi-layer stacked structure, and the stacking of the multi-layer structure causes the light transmittance of the metasurface to decrease sharply.

[0005] SUMMARY

[0006] To solve the above technical problems, the purpose of the present application is to provide a transparent transmission unit, array based on Huygens metasurface and a preparation method thereof, which can achieve high transmittance of electromagnetic waves and be easily deployed on existing windows, and enhance the wireless signal receiving range of a specific area.

[0007] The first technical solution adopted by the present application is a transparent transmission unit based on Huygens metasurface, comprising a middle dielectric layer, a first metal layer and a second metal layer, the upper surface of the middle dielectric layer is provided with the first metal layer, and the lower surface of the middle dielectric layer is provided with the second metal layer, wherein:

[0008] The middle dielectric layer is used for the propagation of light and electromagnetic waves;

[0009] The first metal layer and the second metal layer are both double circular arc structures, the opening positions of the double circular arc structures of the first metal layer and the second metal layer are in anti-symmetrical relationship with each other, the first metal layer and the second metal layer are used for modulation of electromagnetic waves, surface excitation currents are formed to form Huygens resonance, and the electromagnetic wave transmittance of the transparent transmission unit is improved.

[0010] Further, the intermediate medium layer includes a first PET layer, a glass layer, and a second PET layer, wherein the upper surface of the glass layer is pasted with the first PET layer through optical transparent adhesive, the first metal layer is etched on the surface of the first PET layer, the lower surface of the glass layer is pasted with the second PET layer through optical transparent adhesive, and the second metal layer is etched on the surface of the second PET layer.

[0011] Further, the thicknesses of the first PET layer and the second PET layer are both 50μm, and the thickness of the glass layer is 5mm.

[0012] Further, the first metal layer and the second metal layer generate first surface excitation current and second surface excitation current under the condition of y-polarized incident electromagnetic wave, at this time, strong electric dipole resonance is generated on the surface of the first metal layer and the surface of the second metal layer, when the first surface excitation current and the second surface excitation current are in opposite directions, strong magnetic dipole resonance is generated between the first metal layer and the second metal layer, through the interaction of the strong electric dipole resonance and the strong magnetic dipole resonance, Huygens super surface is excited to generate Huygens resonance, so that the transparent transmission unit obtains a phase control range of 290° when the transmission amplitude is higher than -3dB.

[0013] The third technical solution adopted in the present application is a transparent transmission array based on Huygens super surface, including a plurality of transparent transmission units of Huygens super surface arranged in a rectangular manner.

[0014] The third technical solution adopted in the present application is a preparation method of a transparent transmission unit based on Huygens super surface, including the following steps:

[0015] Determine the unit phase distribution of the Huygens super surface according to the generalized Snell's law;

[0016] Adjust and process the parameters of the double circular arc structure according to the unit phase distribution of the Huygens super surface to obtain the double circular arc structure parameters;

[0017] Prepare a metal layer according to the double circular arc structure parameters and etch it on the surface of the PET layer;

[0018] The target on the PET layer is positioned, the PET layer etched with the metal layer is pasted on the glass through the optical transparent adhesive, and a transparent transmission unit is prepared.

[0019] Further, the step of determining the unit phase distribution of the Huygens super surface according to the generalized Snell's law specifically comprises:

[0020] Determining the refractive index on both sides of the Huygens super surface unit, the wavelength of the incident electromagnetic wave and the incident angle of the incident electromagnetic wave;

[0021] According to the refractive index on both sides of the Huygens super surface unit, the wavelength of the incident electromagnetic wave and the incident angle of the incident electromagnetic wave, the transmission angle of the Huygens super surface is determined, and the relationship between the incident angle and the transmission angle of the Huygens super surface is obtained.

[0022] Based on the generalized Snell's law, the unit phase distribution of the Huygens super surface is determined according to the relationship between the incident angle and the transmission angle of the Huygens super surface.

[0023] Further, the double-arc structure parameters include the angle of the outer arc, the angle of the inner arc, the transmission amplitude of the transparent transmission unit and the phase control range of the transparent transmission unit.

[0024] The beneficial effects of the transparent transmission unit, the transparent transmission array and the preparation method of the present application are: the present application uses the metal layer with a double-arc structure as a patch material, and the opening positions of the double-arc structures of the upper and lower metal layers are in anti-symmetrical relationship, and the use of the upper and lower two layers of anti-symmetrical metal patches makes it produce strong magnetic dipole resonance; at the same time, the upper and lower two layers of metal patches can also independently produce strong electric dipole resonance, through the interaction of electric dipole resonance and magnetic dipole resonance, the Huygens resonance can be excited by the super surface, so as to realize high transmittance of electromagnetic wave and easy deployment on existing windows, and enhance the wireless signal receiving range of a specific area. BRIEF DESCRIPTION OF DRAWINGS

[0025] FIG. 1 is a structural schematic diagram of a transparent transmission unit based on a Huygens super surface according to the present application;

[0026] FIG. 2 is a preparation process schematic diagram of a transparent transmission unit based on a Huygens super surface according to the present application;

[0027] FIG. 3 is a surface current distribution schematic diagram of an optical transparent Huygens super surface unit under y-polarized incident electromagnetic wave condition according to the present application;

[0028] FIG. 4 is a S parameter curve schematic diagram of a Huygens super surface according to the present application;

[0029] FIG. 5 is a normalized surface conductance and normalized surface magnetic impedance curve schematic diagram of a Huygens super surface according to the present application;

[0030] FIG. 6 is a schematic diagram of symmetrically distributing super surface units according to specific embodiments of the present application;

[0031] FIG. 7 is a schematic diagram of a test scenario of a super surface and an electric field result according to specific embodiments of the present application;

[0032] FIG. 8 is a schematic diagram of a structure of a transparent transmission array of a Huygens super surface according to specific embodiments of the present application;

[0033] FIG. 9 is a schematic diagram of a result of improving communication performance of a transparent transmission unit of the present application compared with ordinary glass under electromagnetic wave vertical incidence according to specific embodiments of the present application;

[0034] FIG. 10 is a schematic diagram of a result of improving communication performance of a transparent transmission unit of the present application compared with ordinary glass under electromagnetic wave 45° incidence according to specific embodiments of the present application;

[0035] FIG. 11 is a schematic diagram of a signal strength test result of a transparent transmission unit according to specific embodiments of the present application. DETAILED DESCRIPTION

[0036] The present application will be further described below in conjunction with the drawings and specific embodiments. For the step numbers in the following embodiments, they are only set for the convenience of description and explanation, and the order between the steps is not limited in any way. The execution order of each step in the embodiments can be adaptively adjusted according to the understanding of those skilled in the art.

[0037] With the rapid development of mobile communication network technology, the demand for user transmission rate has significantly increased, prompting people to use higher frequency electromagnetic waves for communication. However, high-frequency electromagnetic waves have large attenuation and are difficult to diffract over obstacles, resulting in many signal coverage holes in high-frequency wireless communication networks. As a new way to control wireless channels, super surfaces have the characteristics of low cost, low power consumption, and easy deployment. Transparent super surfaces have a wide range of application scenarios due to their high light transmittance, and therefore have attracted widespread attention from the industry and academia.

[0038] Based on this, referring to FIG. 1, the present application provides a transparent transmission unit based on a Huygens super surface, which includes a middle medium layer, a first metal layer and a second metal layer, the upper surface of the middle medium layer is provided with the first metal layer, and the lower surface of the middle medium layer is provided with the second metal layer, wherein:

[0039] The middle medium layer is used for the propagation of light and electromagnetic waves;

[0040] Specifically, the intermediate dielectric layer comprises a first PET layer, a glass layer and a second PET layer, wherein the upper surface of the glass layer is pasted with the first PET layer through an optical transparent adhesive, the first metal layer is etched on the surface of the first PET layer, the lower surface of the glass layer is pasted with the second PET layer through an optical transparent adhesive, and the second metal layer is etched on the surface of the second PET layer.

[0041] The thickness of the first PET layer and the second PET layer is 50 μm, and the thickness of the glass layer is 5 mm.

[0042] The first metal layer and the second metal layer are both double circular arc structures, the opening positions of the double circular arc structures of the first metal layer and the second metal layer are in anti-symmetrical relationship, and the first metal layer and the second metal layer are used for modulation of electromagnetic waves to generate surface excitation current to form Huygens resonance to improve the electromagnetic wave transmittance of the transparent transmission unit.

[0043] Specifically, the first metal layer and the second metal layer generate first surface excitation current and second surface excitation current under the condition of y-polarized incident electromagnetic wave, at this time, strong electric dipole resonance is generated on the surface of the first metal layer and the surface of the second metal layer, when the first surface excitation current and the second surface excitation current are in opposite directions, strong magnetic dipole resonance is generated between the first metal layer and the second metal layer, through the interaction of the strong electric dipole resonance and the strong magnetic dipole resonance, Huygens super surface generates Huygens resonance, so that the transparent transmission unit obtains a phase control range of 290° when the transmission amplitude is higher than -3dB.

[0044] In this embodiment, the high-transmittance Huygens super surface unit comprises a dielectric and a metal layer located on the upper and lower surfaces of the dielectric, respectively. Both the upper and lower metal layers contain double circular arc structures. The opening positions of the double circular arc structures of the upper and lower layers are anti-symmetrical, and there is partial overlap between the upper and lower layers at the opening. By adjusting the arc length of the inner and outer circles, the Huygens super surface unit can achieve a phase control of 290° while maintaining a transmission amplitude higher than -3dB.

[0045] In order to achieve high transmittance, the metal layer patch is prepared by using a metal mesh, and the dielectric is selected to be polyethylene terephthalate (PET) and glass. In the preparation process, the metal mesh patch needs to be etched on the PET, and then the PET is pasted on the glass through an optical transparent adhesive. The use of these materials and preparation methods makes the super surface easy to deploy on existing windows and has a transmittance of more than 80%.

[0046] When electromagnetic waves are irradiated on the metasurface, surface currents are excited on the upper and lower metal layers. Due to the phase difference between the surface currents of the upper and lower metal layers, the surface currents of the upper and lower metal layers respectively present the same flow direction and the opposite flow direction in one period. When the surface currents of the upper and lower metal layers are opposite, the upper and lower metal layers generate equivalent current loops, thereby forming magnetic dipole resonance. The patches of the upper and lower metal layers form electric dipole resonance respectively. The interaction between the electric dipole resonance and the magnetic dipole resonance excites Huygens resonance, thereby realizing high transmittance of electromagnetic waves.

[0047] According to the generalized Snell's law, the optical transparent metasurface proposed can generate -45° and 45° transmitted electromagnetic waves respectively under the condition of vertical incidence of electromagnetic waves, so as to improve the wireless signal coverage of a specific area.

[0048] Further, the structural detail parameters of the transparent transmission unit provided by the embodiment of the application are described. The Huygens metasurface unit first etches the metal mesh patch on the PET, and then uses the optical transparent adhesive to paste the PET on the upper and lower surfaces of the glass. The metal mesh patch structures of the upper and lower two layers are both double circular arc structures, and the upper and lower two layers of patches have the structure characteristics of anti-symmetry. FIG. 1 is a schematic diagram of the Huygens metasurface structure disclosed by the application. The dielectric materials of the metasurface unit are selected to be glass and PET, and their thicknesses are H1=5 mm and H2=50 μm respectively. The metasurface unit adopts a square structure with a side length of P=18 mm. The patch adopts a double circular arc structure, the radii of the outer and inner circular arcs are R1=8.5 mm and R2=7 mm respectively, the distance between the two circular arcs is G=0.5 mm, and the line width of the patch is W=1 mm. and are variables to be adjusted. For the above-mentioned patch, a metal mesh with a line width of 10 μm, a pitch of 200 μm and a thickness of 2 μm is used for preparation. The sheet resistance of the metal mesh under the above-mentioned parameters is 0.24 Ω / sq.

[0049] FIG. 3 is a surface current distribution diagram of the optical transparent Huygens metasurface unit under the condition of y-polarized incident electromagnetic waves. It can be obtained that when the surface currents of the upper and lower two layers of metal mesh patches are opposite, the upper and lower two layers of metal patches introduce equivalent electric dipoles (along the y-axis direction) with opposite electric dipole moment directions. The electric dipoles with opposite directions can generate an equivalent current loop between the upper and lower two layers of circular arcs, that is, a magnetic dipole resonance (along the x-axis direction). Therefore, the optical transparent Huygens metasurface unit proposed by the embodiment of the application generates mutually orthogonal electric dipole resonance and magnetic dipole resonance under the condition of y-polarized electromagnetic wave incidence, thereby generating Huygens resonance, and achieving high electromagnetic wave transmittance.

[0050] To better demonstrate the characteristics of the Huygens super surface unit, Figure 4 shows the S parameter curve of the proposed Huygens super surface. As can be seen from the figure, Huygens resonance can make the proposed Huygens super surface unit obtain a phase control range of about 290° while ensuring high transmittance.

[0051] The transparent transmissive array based on the Huygens super surface includes a plurality of transparent transmissive units of the Huygens super surface arranged in a rectangular manner.

[0052] Specifically, the transparent transmissive array based on the Huygens super surface includes 24x24 Huygens super surface units polarized along the y axis, and the arrangement is as shown in Figure 8 to obtain transmissive beams along-45° and 45°, respectively.

[0053] In summary, the embodiment of the present application provides a Huygens super surface unit with high optical transmittance. Using the generalized Snell's law, two electromagnetic waves pointing to-45° and 45°, respectively, can be generated under the condition of vertical incidence of electromagnetic waves, so as to enhance the wireless signal coverage of a specific area. Due to the symmetry of the passive device, the proposed super surface can generate vertically transmitted electromagnetic waves under the condition of-45° or 45° incidence, which can enhance the wireless signal receiving range of a specific area. The embodiment of the present application has a high transmittance and a super-thin single-layer dielectric structure, is easy to process and deploy on existing windows, and can be effectively applied to beam deflection, electromagnetic stealth and the like.

[0054] Therefore, the transparent transmissive unit based on the Huygens super surface and the transparent transmissive array based on the Huygens super surface of the embodiment of the present application have the following advantages over the prior art:

[0055] 1) The metal grid is used as the patch material, and PET and glass are used as the dielectric. Through the structure of "patch-PET-glass-PET-patch", the super surface proposed in the embodiment of the present application has a transmittance of more than 80% and is easy to deploy on existing windows.

[0056] 2) The use of the upper and lower anti-symmetric metal patch design makes it produce strong magnetic dipole resonance; at the same time, the upper and lower metal patches can independently produce strong electric dipole resonance. Through the interaction of electric dipole resonance and magnetic dipole resonance, the super surface can excite Huygens resonance, thereby realizing high transmittance of electromagnetic waves. The super surface unit can realize 290° transmissive phase control. And since the proposed design method does not need to cut or stack the dielectric, it is more conducive to deployment on existing glass.

[0057] 3) The embodiment of the present application also discloses a beam control super surface designed by using the high transmittance Huygens super surface unit, which can realize enhancement of wireless signal coverage of a specific area.

[0058] Referring to FIG. 2, the preparation method of the transparent transmission unit based on the Huygens super surface includes the following steps:

[0059] S100, determining the unit phase distribution of the Huygens super surface according to the generalized Snell's law;

[0060] Specifically, the refractive index on both sides of the Huygens super surface unit, the wavelength of the incident electromagnetic wave and the incident angle of the incident electromagnetic wave are determined; according to the refractive index on both sides of the Huygens super surface unit, the wavelength of the incident electromagnetic wave and the incident angle of the incident electromagnetic wave, the transmission angle of the Huygens super surface is determined, the relationship between the incident angle and the transmission angle of the Huygens super surface is obtained; according to the generalized Snell's law, the unit phase distribution of the Huygens super surface is determined according to the relationship between the incident angle and the transmission angle of the Huygens super surface.

[0061] S200, adjusting and processing the parameters of the double circular arc structure according to the unit phase distribution of the Huygens super surface to obtain the double circular arc structure parameters;

[0062] The double circular arc structure parameters include the angle of the outer circular arc, the angle of the inner circular arc, the transmission amplitude of the transparent transmission unit and the phase control range of the transparent transmission unit.

[0063] S300, preparing a metal layer according to the double circular arc structure parameters and etching on the surface of the PET layer;

[0064] S400, positioning the target on the PET layer, and pasting the PET layer etched with the metal layer on the glass through the optical transparent adhesive to prepare the transparent transmission unit.

[0065] Specifically, for a given electromagnetic wave polarization direction, the electric dipole resonance and the magnetic dipole resonance of the Huygens super surface can be characterized by the normalized surface admittance (Y es η) and the normalized surface magnetic impedance (Z ms / η), where η is the free space wave impedance. Based on the above characterization method, the normalized surface admittance, the normalized surface magnetic impedance and the transmission coefficient (T) and the reflection coefficient (R) have the following relationship, and the expression is:

[0066] Wherein, η is the free space wave impedance, Y es is the electric surface admittance, and Z ms is the magnetic surface impedance.

[0067] The expressions of the normalized surface admittance and the normalized surface magnetic impedance can be used to obtain that the Huygens metasurface unit achieves full transmission characteristics when the normalized surface admittance and the normalized surface magnetic impedance have zero real parts and equal imaginary parts. FIG. 5 shows the normalized surface admittance and the normalized surface magnetic impedance curves of the proposed Huygens metasurface. By comparing FIG. 4 and FIG. 5, it can be obtained that when the frequency is between 5.5 GHz and 6.7 GHz, the normalized surface admittance and the normalized surface magnetic impedance of the Huygens metasurface have zero real parts and equal imaginary parts, and thus high electromagnetic wave transmission rates are achieved at the two frequency points. Since the two high transmission rate frequency points are adjacent, an electromagnetic wave passband is formed near them, and the unit can achieve a phase coverage of 290° in the passband.

[0068] Based on the above metasurface unit structure, an embodiment of the present application provides a beam deflection metasurface structure with a working frequency band near the 5.9 GHz communication frequency band, and the transmission angles of the deflected beams are-45° and 45°, respectively. The calculation process is as follows:

[0069] Based on the generalized Snell's law, there is a relationship between the incident angle and the transmission angle as shown below

[0070] where θ r and θ i are the transmission angle and the incident angle, respectively, and λ is the wavelength of the incident electromagnetic wave. Since both sides of the metasurface are air, n i is used to represent the refractive index of the two sides of the metasurface, is the phase gradient of the designed metasurface, and P is the side length of the metasurface unit. When the incident wave is vertically incident to the metasurface, the incident angle θ i = 0, and the two sides of the metasurface are air (n i = 1) can be obtained as follows:

[0071] From the above formula, when the phase difference between adjacent units is π / 2, θ r is about 45°. By symmetrically distributing the metasurface units as shown in FIG. 6, beams transmitted to-45° and 45°, respectively, can be obtained. According to the above method, Table 1 shows specific reference values for the Huygens metasurface to achieve a 45° deflection of the transmitted beam while maintaining a high transmission rate (-3 dB) standard, as shown in Table 1:

[0072] Table 1 Reference values of double-arc structure parameters

[0073] Based on the above-described Huygens super surface structure design and adjacent unit phase design, the optical transparent transmission super surface proposed by the application has 24*24 units, and Figure 7 shows the test scene and electric field result of the super surface proposed by the application. It can be seen that in the case of vertical incidence of electromagnetic waves, the transmission beam basically propagates along the-45° and 45° directions. In the case of 45° incidence of electromagnetic waves, the transmission electromagnetic wave basically verifies the vertical direction propagation of the super surface. In addition, the optical transparent super surface reaches a transmittance of 82% in the visible light range.

[0074] Figures 9, 10 and 11 show the communication performance improvement of the proposed super surface compared with ordinary glass. When the transmission power is 15dBm, at the points B1, B4, C1 and C4 which are about-45° and 45°, the received signal strength is improved by 11.55dB, 10.9dB, 11.33dB and 10.28dB respectively. For the points B1 and B4, the symbol error rate (SER) is reduced by 80% and 85% respectively under the transmission power of-5dBm.

[0075] The contents in the above method embodiments are all applicable to the system embodiments, the system embodiments specifically implement the same functions as the above method embodiments, and achieve the same beneficial effects as the above method embodiments.

[0076] The above is a specific description of the preferred embodiments of the application, but the application creation is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the application. These equivalent modifications or replacements are all included in the scope defined by the claims of the application.

Claims

1. A transparent transmission unit based on a Huygens super surface, characterized in that, The intermediate medium layer, the first metal layer and the second metal layer are provided, an upper surface of the intermediate medium layer is provided with the first metal layer, a lower surface of the intermediate medium layer is provided with the second metal layer, wherein: The intermediate medium layer is used for propagation of light and electromagnetic waves; The first metal layer and the second metal layer are both double circular arc structures, the opening positions of the double circular arc structures of the first metal layer and the second metal layer are in anti-symmetrical relationship, the first metal layer and the second metal layer are used for modulation of electromagnetic waves, surface excitation current is formed to generate Huygens resonance, and electromagnetic wave transmittance of the transparent transmission unit is improved.

2. The transparent transmission unit based on a Huygens super-surface according to claim 1, characterized in that, The intermediate medium layer comprises a first PET layer, a glass layer and a second PET layer, an upper surface of the glass layer is pasted with the first PET layer through optical transparent adhesive, the first metal layer is etched on a surface of the first PET layer, a lower surface of the glass layer is pasted with the second PET layer through optical transparent adhesive, and the second metal layer is etched on a surface of the second PET layer.

3. The transparent transmission unit based on a Huygens super-surface according to claim 2, characterized in that, The thicknesses of the first PET layer and the second PET layer are both 50 μm, and the thickness of the glass layer is 5 mm.

4. The transparent transmission unit based on a Huygens super-surface according to claim 3, characterized in that, The first metal layer and the second metal layer generate first surface excitation current and second surface excitation current under the condition of y-polarized incident electromagnetic wave, at this time, strong electric dipole resonance is generated on surfaces of the first metal layer and the second metal layer, when the first surface excitation current and the second surface excitation current are in opposite directions, strong magnetic dipole resonance is generated between the first metal layer and the second metal layer, through interaction of the strong electric dipole resonance and the strong magnetic dipole resonance, Huygens super surface generates Huygens resonance, and the transparent transmission unit obtains a phase control range of 290° when the transmission amplitude is higher than -3 dB.

5. A transparent transmission array based on a Huygens super-surface, characterized in that, The transparent transmission unit comprises a plurality of Huygens super surfaces arranged in a rectangular manner.

6. A method of manufacturing a transparent transmission unit based on a Huygens super-surface as claimed in claim 1, characterized in that, The method comprises the following steps: determining unit phase distribution of the Huygens super surface according to the generalized Snell law; adjusting parameters of the double circular arc structure according to the unit phase distribution of the Huygens super surface to obtain double circular arc structure parameters; preparing a metal layer according to the double circular arc structure parameters and etching the metal layer on a surface of a PET layer; positioning a target on the PET layer, pasting the PET layer etched with the metal layer on the glass through optical transparent adhesive to prepare the transparent transmission unit.

7. The method of claim 6, wherein the transparent transmission unit based on the Huygens super surface is prepared by the steps of: forming a first layer on a substrate; forming a second layer on the first layer; and forming a third layer on the second layer. The step of determining the unit phase distribution of the Huygens super surface according to the generalized Snell law specifically comprises: determining refractive indexes of two sides of the Huygens super surface unit, a wavelength of incident electromagnetic wave and an incident angle of the incident electromagnetic wave; determining a transmission angle of the Huygens super surface according to the refractive indexes of two sides of the Huygens super surface unit, the wavelength of the incident electromagnetic wave and the incident angle of the incident electromagnetic wave to obtain a relationship between the incident angle and the transmission angle of the Huygens super surface; determining the unit phase distribution of the Huygens super surface according to the relationship between the incident angle and the transmission angle of the Huygens super surface based on the generalized Snell law.

8. The method of claim 7, wherein the transparent transmission unit based on the Huygens super surface is prepared by, The double-arc structure parameters include an angle of the outer arc, an angle of the inner arc, a transmission amplitude of the transparent transmission unit, and a phase control range of the transparent transmission unit. The double-arc structure parameters include an angle of the outer arc, an angle of the inner arc, a transmission amplitude of the transparent transmission unit, and a phase control range of the transparent transmission unit.

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