Complete polarization Fabry-Perot resonance material

Abstract

The invention discloses a complete polarization Fabry-Perot resonance material, and belongs to the technical field of artificial media, the complete polarization Fabry-Perot resonance material comprises at least four sub-wavelength unit structures, and each sub-wavelength unit comprises a plate-shaped first sub-unit parallel to an x-axis-y-axis plane; the second subunit is a cross-shaped cylinder formed by mutually perpendicular two surfaces parallel to the x-axis-z-axis plane and the y-axis-z-axis plane, and the two first subunits are arranged at the two ends of the cross shape of the second subunit in a mirror symmetry mode. According to the conversion optical device, complete transmission of TM polarized waves and TE polarized waves with specified working frequencies at any incident angle can be realized. The Fabry-Perot resonant material is simple in structure, thin in thickness and light in weight, is perfectly matched with a free space, and can be widely applied to the fields of electromagnetic compatibility, electromagnetic interference resistance and the like, such as various military fields of airplanes, radars and the like.

Description

Technical Field

[0001] The present invention relates to the field of artificial medium technology, and in particular to a fully polarized Fabry-Perot resonant material realized based on an artificial electromagnetic medium construction method. Background Art

[0002] Transformation optics uses cleverly designed materials to greatly facilitate the manipulation of electromagnetic waves. Using this technology, scientists have designed and realized a variety of new optical devices, such as cloaking devices, concentrators, lenses, curved waveguides, retroreflectors, etc.

[0003] Generally speaking, the constitutive parameters of ideal transformation optical devices (such as cloaking devices) are spatially non-uniform and often have extreme values, which makes the actual realization of ideal transformation optical devices very difficult. Currently in the field of transformation optics, the uniform materials obtained by linear coordinate transformation are all materials with simplified parameters. Although the design based on parameter simplification can avoid the extreme values ​​of parameters and maintain the trajectory of light in the transformation optical device, it will produce unnecessary reflections at the interface between the transformation optical device and the background medium.

[0004] Therefore, in order to ensure that the propagation characteristics of the light beam can be maintained consistent no matter what angle it is incident at inside the free space transformation optical device, it is necessary to develop a transparent material that can achieve full angle matching. Although a research team has successfully developed a TM polarization Fabry-Pérot resonant material, such as the prior art document 1: MM Saeghi, Sucheng Li, Lin Xu, Bo Hou*, and Huanyang Chen*, Transformation optics with Fabry-Pérot resonances, Scientific Reports 5:8680, DOI:10.1038 / srep08680 (2015), which can achieve a perfect transformation structure of two planes of the same size in space, this material can make the TM polarized electromagnetic wave completely pass through without reflection when incident at any angle, but the polarization state of the electromagnetic wave in practical applications is usually random and variable. Therefore, in order to realize transformation optical devices such as full polarization stealth devices, concentrators, lenses, curved waveguides, and retroreflectors, the development of full polarization full-angle Fabry-Pérot resonant materials is crucial. Summary of the invention

[0005] In order to solve the problems in the background technology, the present invention aims to provide a fully polarized Fabry-Perot resonant material. By controlling the equivalent wave impedance of the corresponding material, it is strictly in line with the electromagnetic parameter form of the fully polarized Fabry-Perot resonant material; at this time, the equivalent wave impedance of the material is completely consistent with the free space, and any polarized electromagnetic wave incident at any angle will completely pass through the material without reflection.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A fully polarized Fabry-Perot resonant material comprises at least four sub-wavelength unit structures; the sub-wavelength unit comprises a first sub-unit, which is in a plate shape and parallel to an x-axis-y-axis plane; and a second sub-unit, which is a cross-shaped column composed of two surfaces respectively parallel to the x-axis-z-axis plane and the y-axis-z-axis plane and perpendicular to each other, and two of the first sub-units are respectively arranged at two ends of the cross of the second sub-unit in a mirror-symmetrical manner; the first sub-unit comprises a first dielectric plate, a first metal sub-wavelength open ring resonator, and a second metal sub-wavelength open ring resonator; the first metal sub-wavelength open ring resonator and the second metal sub-wavelength open ring resonator are respectively arranged on two side plate surfaces of the first dielectric plate, and the second metal sub-wavelength open ring resonator faces the second sub-unit; the second sub-unit comprises four branch dielectric plates, and the four branch dielectric plates are cross-connected; the branch dielectric plates comprise a second dielectric plate, a third dielectric plate, and a bent metal structure, and the second dielectric plate and the third dielectric plate clamp the bent metal structure.

[0008] In a preferred embodiment of the present invention, the first metal subwavelength open ring resonator is composed of two first open metal rings arranged symmetrically in the upper and lower parts, and the open end of each of the first open metal rings faces the inner side of the first dielectric plate; the second metal subwavelength open ring resonator is composed of two second open metal rings arranged symmetrically in the left and right parts, and the open end of each of the second open metal rings faces the inner side of the first dielectric plate.

[0009] In a preferred embodiment of the present invention, a gap is provided between the first open metal ring and the outer edge of the top surface of the first dielectric plate, and a gap is provided between the second open metal ring and the outer edge of the top surface of the first dielectric plate.

[0010] In a preferred embodiment of the present invention, the first open-circuit metal ring and the second open-circuit metal ring are open square rings.

[0011] In a preferred embodiment of the present invention, the main body of the bent metal structure in the branch dielectric plate is in a U shape, the bottom part of the U shape is arranged on the side of the branch dielectric plate far from the center of the second sub-unit and extends to the edge of this side, and the two side arms of the U shape in the bent metal structure are arranged in an S-shaped coil.

[0012] In a preferred embodiment of the present invention, when the Fabry-Perot resonant material is composed of a plurality of the sub-wavelength units, the orientations of the plurality of the sub-wavelength units are the same; the sub-wavelength units arranged along the x-axis direction or the y-axis direction are closely arranged, and the number of arrangements is a natural number greater than or equal to 1. The two adjacent sub-wavelength units arranged along the x-axis direction or the y-axis direction are butted through the second dielectric plate, the third dielectric plate and the bent metal structure; the sub-wavelength units arranged along the z-axis direction are equally spaced and the number is an integer multiple of 4.

[0013] In a preferred embodiment of the present invention, the lengths of the first sub-unit and the second sub-unit in the x-axis direction are the same and less than 1 / 5 of the operating wavelength.

[0014] In a preferred embodiment of the present invention, the equivalent relative permittivity of the Fabry-Perot resonant material satisfies the form of diag(A, A, ∞) at the operating frequency, the equivalent permeability satisfies the form of diag(B, B, ∞) at the operating frequency, and the thickness of the Fabry-Perot resonant material 10 is equal to an integer multiple of the length of the operating wavelength in the z-axis direction; in the forms of diag(A, A, ∞) and diag(B, B, ∞), both A and B represent real values; a three-dimensional coordinate system is constructed with the center of any one of the sub-wavelength units as the origin. The fact that the equivalent relative permittivity satisfies the form of diag(A, A, ∞) means that the equivalent relative permittivity of the Fabry-Perot resonant material along the x-axis direction and the equivalent relative permittivity along the y-axis direction are both A, and the equivalent relative permittivity along the z-axis direction is ∞; the fact that the equivalent permeability satisfies the form of diag(B, B, ∞) means that the equivalent permeability of the Fabry-Perot resonant material along the x-axis direction and the equivalent permeability along the y-axis direction are both B, and the equivalent permeability along the z-axis direction is ∞.

[0015] In a preferred embodiment of the present invention, the equivalent relative dielectric constant and the equivalent magnetic permeability of the Fabry-Perot resonant material both satisfy the form of diag(C, D, ∞) at the operating frequency, and the thickness of the Fabry-Perot resonant material 10 is equal to an integer multiple of the length of the operating wavelength in the z-axis direction; in the form of diag(C, D, ∞), C and D both represent real values; a three-dimensional coordinate system is constructed with the center of any sub-wavelength unit as the origin, and the equivalent relative dielectric constant and the equivalent magnetic permeability both satisfy the form of diag(C, D, ∞), indicating that the equivalent relative dielectric constant of the Fabry-Perot resonant material 10 along the x-axis direction is C, the equivalent relative dielectric constant along the y-axis direction is D, and the equivalent relative dielectric constant along the z-axis direction is ∞, the equivalent magnetic permeability of the Fabry-Perot resonant material 10 along the x-axis direction is C, the equivalent magnetic permeability along the y-axis direction is D, and the equivalent magnetic permeability along the z-axis direction is ∞.

[0016] In a preferred embodiment of the present invention, the first dielectric plate, the second dielectric plate and the third dielectric plate are made of F4B dielectric; the first metal subwavelength open ring resonator, the second metal subwavelength open ring resonator and the curved metal structure are made of metal copper.

[0017] The present invention constructs an ideal transformation optical device in free space, which can achieve complete transmission of TM polarized waves and TE polarized waves of a specified working frequency at any incident angle. The Fabry-Perot resonant material of the present invention has a simple structure, thin thickness, light weight, and perfect matching with free space, and can be widely used in the fields of electromagnetic compatibility and anti-electromagnetic interference, such as various military fields such as aircraft and radar.

[0018] In order to make the above features and advantages of the invention more obvious and easy to understand, embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG. 1( a ) is a three-dimensional diagram of the structure of a sub-wavelength unit in a Fabry-Perot resonant material of the present invention.

[0020] FIG. 1( b ) is a disassembled stereoscopic view of the sub-unit structure in the sub-wavelength unit of the present invention.

[0021] FIG. 2( a ) is a left side view of the first subunit in the sub-wavelength unit of the present invention.

[0022] FIG. 2( b ) is a right side view of the first subunit in the sub-wavelength unit of the present invention.

[0023] FIG. 2( c ) is a top view of the first subunit in the sub-wavelength unit of the present invention.

[0024] FIG. 3( a ) is a top view of the second subunit in the sub-wavelength unit of the present invention.

[0025] FIG. 3( b ) is a side view of the second subunit in the sub-wavelength unit of the present invention.

[0026] FIG. 3( c ) is a front view of the second subunit in the sub-wavelength unit of the present invention.

[0027] FIG. 3( d ) is a three-dimensional diagram of the second subunit in the sub-wavelength unit of the present invention.

[0028] Figure 4 Schematic diagram of multiple sub-wavelength units arranged to form a Fabry-Perot resonant material.

[0029] FIG5(a) is a phase spectrum simulation diagram of the Fabry-Perot resonant material in the example when TE polarized waves are incident at multiple angles.

[0030] FIG5( b ) is a simulation diagram of the amplitude spectrum of the Fabry-Perot resonant material in the example when the TE polarized wave is incident at multiple angles.

[0031] FIG6( a ) is a phase spectrum simulation diagram of the Fabry-Perot resonant material in the example when TM polarized waves are incident at multiple angles.

[0032] FIG6( b ) is a simulation diagram of the amplitude spectrum of the Fabry-Perot resonant material in the example when the TM polarized wave is incident at multiple angles.

[0033] Description of Reference Numerals

[0034] 10Fabry-Perot resonant materials

[0035] 100th wavelength unit

[0036] 110 First subunit

[0037] 111 first dielectric plate

[0038] 112 The first metal subwavelength open ring resonator

[0039] 1121 First open circuit metal ring

[0040] 113 The second metal subwavelength open ring resonator

[0041] 1131 Second open metal ring

[0042] 120 Second subunit

[0043] 121 branch medium board

[0044] 122 second medium board

[0045] 123 Third medium board

[0046] 124 curved metal structure

[0047] 200 intervals DETAILED DESCRIPTION

[0048] In order to make the purpose and technical solution of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] FIG. 1( a ) is a structural stereogram of a sub-wavelength unit in a Fabry-Perot resonant material of the present invention, and FIG. 1( b ) is a disassembled stereogram of a sub-unit structure in a sub-wavelength unit of the present invention. As shown in FIG. 1( a ) and FIG. 1( b ), the Fabry-Perot resonant material 10 of the present invention includes at least four sub-wavelength units 100, each of which includes two first sub-units 110 and a second sub-unit 120. The second sub-unit 120 is a cross-shaped column, and the two first sub-units 110 are plate-shaped and are respectively arranged at the two ends of the cross of the second sub-unit 120 in a mirror-symmetrical manner. As shown in the coordinate system in FIG. 1 , the two faces of the cross-shaped column constituting the second sub-unit 120 are perpendicular to each other and are parallel to the x-axis-z-axis plane and the y-axis-z-axis plane, respectively, and the second sub-unit 120 forms two cross-shaped end faces on the x-axis-y-axis plane. The two first subunits 110 are parallel to the x-axis-y-axis plane and are respectively located on two cross-shaped end faces on the left and right sides of the second subunit 120. After being combined with the second subunit 120, the overall structure is roughly I-shaped.

[0050] The first subunit 110 includes a first dielectric plate 111, a first metal subwavelength open ring resonator 112, and a second metal subwavelength open ring resonator 113. The first metal subwavelength open ring resonator 112 and the second metal subwavelength open ring resonator 113 are respectively arranged on both side surfaces of the first dielectric plate 111, and the second metal subwavelength open ring resonator 113 faces the second subunit 120.

[0051] The second subunit 120 includes four branch dielectric plates 121, which are cross-connected to form the second subunit 120. The branch dielectric plates 121 include a second dielectric plate 122, a third dielectric plate 123, and a bent metal structure 124. The second dielectric plate 122 and the third dielectric plate 123 sandwich the bent metal structure 124, and the three are stacked to form one branch dielectric plate 121.

[0052] FIG. 2( a ), FIG. 2( b ) and FIG. 2( c ) are respectively a left view, a right view and a top view of the first subunit in the sub-wavelength unit of the present invention. Figure 2(a) to Figure 2(c) It corresponds to the first sub-unit 110 on the left side in Fig. 1(a). The first sub-unit 110 on the right side is mirror-symmetric to the structure on the left side.

[0053] As shown in the figure, the first metal sub-wavelength open-loop resonator 112 is disposed on one side surface of the first dielectric plate 111. The first metal sub-wavelength open-loop resonator 112 is composed of two first open metal rings 1121 arranged symmetrically up and down, and there is a gap between the first open metal ring 1121 and the outer edge of the top surface of the first dielectric plate 111. The main body of the first open metal ring 1121 is an open square ring, and the open end of each first open metal ring 1121 faces the inside of the first dielectric plate 111.

[0054] The second metal sub-wavelength open-loop resonator 113 is disposed on the other side surface of the first dielectric plate 111. The second metal sub-wavelength open-loop resonator 113 is composed of two second open metal rings 1131 arranged symmetrically left and right, and there is a gap between the second open metal ring 1131 and the outer edge of the top surface of the first dielectric plate 111. The main body of the second open metal ring 1131 is an open square ring, and the open end of each second open metal ring 1131 faces the inside of the first dielectric plate 111.

[0055] Figs. 3(a), 3(b), 3(c), and 3(d) are respectively the top view, side view, front view, and three-dimensional view of the second sub-unit in the sub-wavelength unit of the present invention. As shown in the figure, the second sub-unit 120 is formed by cross-connecting four branch dielectric plates 121. The main body of the curved metal structure 124 in the branch dielectric plate 121 is in a U shape, and the bottom part of the U shape is arranged near the side of the branch dielectric plate 121 away from the center of the second sub-unit 120 and extends to the side edge. The two side arms of the U shape in the curved metal structure 124 are arranged in an S-shaped coil.

[0056] Figure 4 It is a schematic diagram of a Fabry-Perot resonant material composed of multiple sub-wavelength units arranged. As Figure 4 shown, the minimum structure of the Fabry-Perot resonant material 10 is composed of four sub-wavelength units 100. The four sub-wavelength units 100 are arranged in the same orientation and are equally spaced along the z-axis direction. It is defined that the z-axis direction is the direction of the intersection line of the planes where the four branch dielectric plates 121 are located in a single sub-wavelength unit 100, the y-axis direction is the direction parallel to the two side arms of the U shape of the curved metal structure 124, and the x-axis direction is perpendicular to the z-axis and perpendicular to the y-axis.

[0057] When the Fabry-Perot resonant material 10 is composed of a plurality of the sub-wavelength units 100, the sub-wavelength units 100 arranged along the x-axis direction or along the y-axis direction are closely arranged, and the number of the arranged sub-wavelength units 100 is a natural number greater than or equal to 1, and two adjacent sub-wavelength units 100 arranged along the x-axis direction or along the y-axis direction are butted against each other through the second dielectric plate 122, the third dielectric plate 123 and the bent metal structure 124. The sub-wavelength units 100 arranged along the z-axis direction are arranged equidistantly, and the number is an integer multiple of 4. A gap 200 is provided between two adjacent sub-wavelength units 100 arranged along the z-axis direction, and the gap 200 is preferably 0.5 mm.

[0058] When TM polarized wave or TE polarized wave is used as the working wave, the relationship between the working frequency and the working wavelength of the working wave satisfies λ=c / f, where λ is the working wavelength, c is the speed of light in vacuum, and f is the working frequency.

[0059] Preferably, the first dielectric plate 111 in the sub-wavelength unit 100 is a square plate, and the side length of the first dielectric plate 111 is less than 1 / 5 of the working wavelength; the second dielectric plate 122 and the third dielectric plate 123 have the same length and width, and the width of the second dielectric plate 122 and the third dielectric plate 123 on the side close to the first sub-unit 110 is equivalent to half of the side length of the first dielectric plate 111. That is, the length of the first sub-unit 110 and the second sub-unit 120 in the x-axis direction is the same and less than 1 / 5 of the working wavelength.

[0060] Since the overall length, width and height of a single sub-wavelength unit 100 in the Fabry-Perot resonant material 10 are much smaller than the working wavelength, the Fabry-Perot resonant material 10 can be regarded as a uniform medium, and the equivalent relative dielectric constant and equivalent magnetic permeability of the Fabry-Perot resonant material 10 can be inverted through the reflection coefficient and transmission coefficient of the Fabry-Perot resonant material 10.

[0061] By adjusting the physical dimensions of the Fabry-Perot resonant material 10, the equivalent relative dielectric constant of the Fabry-Perot resonant material 10 satisfies the form of diag(A,A,∞) at the operating frequency, and the equivalent magnetic permeability satisfies the form of diag(B,B,∞) at the operating frequency, or both the equivalent relative dielectric constant and the equivalent magnetic permeability satisfy the form of diag(C,D,∞), and the thickness of the Fabry-Perot resonant material 10 in the z-axis direction is equal to an integer multiple of the length of the operating wavelength in the z-axis direction, so that TM polarization and TE polarization electromagnetic waves incident from any angle can completely pass through the Fabry-Perot resonant material without reflection.

[0062] In the above-mentioned diag(A,A,∞) form, diag(B,B,∞) form, and diag(C,D,∞) form, A, B, C, and D all represent real values; a three-dimensional coordinate system is constructed with the center of any sub-wavelength unit 100 as the origin, and the equivalent relative dielectric constant satisfies the diag(A,A,∞) form, indicating that the equivalent relative dielectric constant of the Fabry-Perot resonant material 10 along the x-axis direction and the equivalent relative dielectric constant along the y-axis direction are both A, and the equivalent relative dielectric constant along the z-axis direction is ∞; the equivalent magnetic permeability satisfies the diag(B,B,∞) form, indicating that the equivalent magnetic permeability of the Fabry-Perot resonant material 10 along the x-axis direction and the equivalent magnetic permeability along the y-axis direction are both B, and the equivalent magnetic permeability along the z-axis direction is ∞. The equivalent relative permittivity and the equivalent magnetic permeability both satisfy the form of diag(C,D,∞), indicating that the equivalent relative permittivity of the Fabry-Perot resonant material 10 along the x-axis direction is C, the equivalent relative permittivity along the y-axis direction is D, and the equivalent relative permittivity along the z-axis direction is ∞, the equivalent magnetic permeability of the Fabry-Perot resonant material 10 along the x-axis direction is C, the equivalent magnetic permeability along the y-axis direction is D, and the equivalent magnetic permeability along the z-axis direction is ∞.

[0063] Preferably, the first dielectric plate 111, the second dielectric plate 122 and the third dielectric plate 123 are all made of F4B dielectric. The material 124 of the first metal subwavelength open ring resonator 112, the second metal subwavelength open ring resonator 113 and the curved metal structure is preferably copper.

[0064] The working principle of the Fabry-Perot resonant material of the present invention is as follows.

[0065] Since the thickness of the sub-wavelength unit 100 in the Fabry-Perot resonant material 10 is much smaller than the working wavelength, the Fabry-Perot resonant material 10 can be equivalent to a uniform medium, and its equivalent relative dielectric constant can be expressed as Its equivalent relative permeability can be expressed as

[0066] In addition, in order to satisfy the Fabry-Perot resonance effect, the total thickness L of the Fabry-Perot resonance material 10 in the z-axis direction should be an integer multiple of the working wavelength in the z-axis direction, that is, L = m2π / k z (m=1,2,3·····), where k z represents the component of the wave vector in the Fabry-Perot resonant material 10 in the z-axis direction.

[0067] The equivalent uniform medium is a dispersive medium, that is, the relative dielectric constant and relative magnetic permeability will change with the change of frequency. Since the magnetic permeability μ of most natural media is 1, the first metal subwavelength open ring resonator 112 and the second metal subwavelength open ring resonator 113 are constructed to be perpendicular to each other in the x-axis-y-axis plane. By artificially adjusting the physical dimensions of the first metal subwavelength open ring resonator 112 and the second metal subwavelength open ring resonator 113, an equivalent magnetic permeability that can be artificially adjusted and conforms to the Lorentz dispersion model can be obtained within a certain frequency band, that is, B=1.85. Among them, the first metal subwavelength open ring resonator 112 and the second metal subwavelength open ring resonator 113 are constructed to be perpendicular to each other in the x-axis-y-axis plane so that the TM polarized electromagnetic wave and the TE polarized electromagnetic wave can obtain the same magnetic permeability when incident at any angle. The curved metal structure 124 arranged along the z-axis direction is composed of a curved metal transmission line. The curved metal transmission line is provided to introduce equivalent capacitance and inductance, thereby obtaining an equivalent dielectric constant dispersion that can be artificially controlled. By adjusting the physical dimensions of the curved metal structure 124, the Fabry-Perot resonant material can achieve A=4.48 at a certain frequency. By adjusting the structural dimensions of the first metal subwavelength open ring resonator 112, the second metal subwavelength open ring resonator 113 and the curved metal structure 124, resonance is caused to occur so that the equivalent relative dielectric constant ε in the z-axis direction is z and equivalent magnetic permeability μ z Satisfy ε z =μ z =∞. The above design makes the material satisfy the Fabry-Perot resonance effect, so that TM polarized waves and TM polarized waves incident from any angle will completely pass through the material, the reflection coefficient is zero, and the refractive index is

[0068] by Figure 4 The Fabry Perot resonant material 10 composed of four sub-wavelength units 100 is taken as an example, and the length of a single sub-wavelength unit 100 in the y-axis direction, the x-axis direction and the z-axis direction is set to 5 mm, and the four sub-wavelength units 100 are arranged at intervals along the z-axis direction to obtain a free space full-angle perfect matching Fabry Perot resonant material 10. In this embodiment, the first dielectric plate 111, the second dielectric plate 122 and the third dielectric plate 123 are all F4B dielectrics with a thickness of 0.25 mm. The thickness of the metal copper used in the first metal sub-wavelength open ring resonator 112, the second metal sub-wavelength open ring resonator 113 and the bent metal structure 124 is 0.018 mm.

[0069] like Figure 2(a) to Figure 3(c)As shown, the dimensions of each part in the sub-wavelength unit 100 are as follows: a=5mm, a1=0.875mm, a2=0.2mm, a3=0.3mm, a4=0.875mm, w1=3.25mm, w2=1.475mm, w3=0.2mm, t1=0.268mm, t2=0.018mm, t3=0.52mm, p=4.5mm, l1=2.08mm, l2=0.075mm, l3=0.15mm, l4=0.15mm, l5=0.45mm, l6=0.966mm, l7=0.15mm, l8=0.04mm. Based on the numerical values ​​of the above examples, the Fabry-Perot resonant material 10 is simulated.

[0070] Figure 5(a) is a phase spectrum simulation diagram of the Fabry-Perot resonant material in the example when the TE polarized wave is incident at multiple angles, and Figure 5(b) is an amplitude spectrum simulation diagram of the Fabry-Perot resonant material in the example when the TE polarized wave is incident at multiple angles. As shown in Figures 5(a) and 5(b), the simulation results of the TE polarized wave are that at 9.48GHz, when the phase of the incident TE polarized electromagnetic wave increases from 0 degrees to 80 degrees, its reflection coefficient is <-20dB and the phase is 0.

[0071] Figure 6(a) is a phase spectrum simulation diagram of the Fabry-Perot resonant material in the example when the TM polarized wave is incident at multiple angles, and Figure 6(b) is an amplitude spectrum simulation diagram of the Fabry-Perot resonant material in the example when the TM polarized wave is incident at multiple angles. As shown in Figures 6(a) and 6(b), the simulation results of the TM polarized wave are that at 9.48GHz, when the phase of the incident TM polarized electromagnetic wave increases from 0 degrees to 80 degrees, its reflection coefficient is <-20dB and the phase is 0.

[0072] The Fabry-Perot resonant material 10 in the example has good matching characteristics with free space at a frequency of 9.48 GHz. If the present invention is to work at other frequencies, it is necessary to appropriately adjust the sizes of the first metal subwavelength open ring resonator 112, the second metal subwavelength open ring resonator 113 and the bent metal structure 124 according to the working wavelength, so that their equivalent relative dielectric constant satisfies the form of diag(A,A,∞) and the equivalent magnetic permeability satisfies the form of diag(B,B,∞) at the set working frequency, or both the equivalent relative dielectric constant and the equivalent magnetic permeability satisfy the form of diag(C,D,∞).

[0073] In summary, the present invention constructs an ideal transformation optical device in free space, which can achieve complete transmission of TM polarized waves and TE polarized waves of a specified working frequency at any incident angle. The Fabry-Perot resonant material of the present invention has a simple structure, thin thickness, light weight, and perfect matching with free space, and can be widely used in the fields of electromagnetic compatibility and anti-electromagnetic interference, such as various military fields such as aircraft and radar.

[0074] The above examples are not intended to limit the present invention in any form. Any technician familiar with the profession can use the technical content disclosed above to change or modify it into an equivalent example with equivalent changes. However, any simple modifications, equivalent changes and modifications made to the above examples based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A fully polarized Fabry-Perot resonant material, characterized in that: Comprising at least four sub-wavelength unit structures; the sub-wavelength unit includes, A first sub-unit, the first sub-unit being plate-shaped and parallel to the x-axis - y-axis plane; And, A second sub-unit, the second sub-unit being a cross-shaped column formed by two planes respectively parallel to the x-axis - z-axis plane and the y-axis - z-axis plane and perpendicular to each other, and two of the first sub-units are respectively arranged symmetrically by mirror image at both ends of the cross of the second sub-unit; The first sub-unit includes a first dielectric plate, a first metal sub-wavelength open-loop resonator, and a second metal sub-wavelength open-loop resonator; the first metal sub-wavelength open-loop resonator and the second metal sub-wavelength open-loop resonator are respectively arranged on both side plate surfaces of the first dielectric plate, and the second metal sub-wavelength open-loop resonator faces the second sub-unit; The second sub-unit includes four branch dielectric plates, and the four branch dielectric plates are cross-connected; the branch dielectric plates include a second dielectric plate, a third dielectric plate, and a bent metal structure, and the second dielectric plate and the third dielectric plate sandwich the bent metal structure.

2. A fully polarized Fabry-Perot resonant material as claimed in claim 1, characterized in that: The first metal sub-wavelength open-loop resonator is composed of two first open metal rings arranged symmetrically up and down, and the open ends of each of the first open metal rings face the inside of the first dielectric plate; The second metal sub-wavelength open-loop resonator is composed of two second open metal rings arranged symmetrically left and right, and the open ends of each of the second open metal rings face the inside of the first dielectric plate.

3. A fully polarized Fabry-Perot resonant material as claimed in claim 2, characterized in that: There is a gap between the first open metal ring and the outer edge of the top surface of the first dielectric plate, and there is a gap between the second open metal ring and the outer edge of the top surface of the first dielectric plate.

4. A fully polarized Fabry-Perot resonant material as claimed in claim 2, characterized in that: The first open metal ring and the second open metal ring are in the shape of an open square ring.

5. The fully polarized Fabry-Perot resonant material according to claim 1, characterized in that: The main body of the bent metal structure in the branch dielectric plate is in a U shape, the bottom edge part of the U shape is arranged on the side of the branch dielectric plate away from the center of the second sub-unit and extends to the edge of this side, and the two side arms of the U shape in the bent metal structure are arranged in an S-shaped coil.

6. The fully polarized Fabry-Perot resonant material according to claim 1, characterized in that: When the Fabry-Perot resonant material is composed of a plurality of the sub-wavelength units, the orientations of the plurality of sub-wavelength units are the same; the sub-wavelength units arranged along the x-axis direction or the y-axis direction are closely arranged, and the number of arrangements is a natural number greater than or equal to 1. Adjacent two of the sub-wavelength units arranged along the x-axis direction or the y-axis direction are docked through the second dielectric plate, the third dielectric plate and the bent metal structure; The sub-wavelength units arranged along the z-axis direction are equally spaced, and the number is an integer multiple of 4.

7. The fully polarized Fabry-Perot resonant material according to claim 1, characterized in that: The first sub-unit and the second sub-unit have the same length in the x-axis direction and are less than 1 / 5 of the working wavelength.

8. The fully polarized Fabry-Perot resonant material according to claim 1, characterized in that: The equivalent relative dielectric constant of the Fabry-Perot resonant material satisfies the form of diag(A,A,∞) at the operating frequency, and the equivalent magnetic permeability satisfies the form of diag(B,B,∞) at the operating frequency, and the thickness of the Fabry-Perot resonant material 10 is equal to an integer multiple of the length of the operating wavelength in the z-axis direction; in the form of diag(A,A,∞) and diag(B,B,∞), A and B both represent real values; a three-dimensional coordinate system is constructed with the center of any sub-wavelength unit as the origin, and the equivalent relative dielectric constant satisfies the form of diag(A,A,∞), indicating that the equivalent relative dielectric constant of the Fabry-Perot resonant material along the x-axis direction and the equivalent relative dielectric constant along the y-axis direction are both A, and the equivalent relative dielectric constant along the z-axis direction is ∞; the equivalent magnetic permeability satisfies the form of diag(B,B,∞), indicating that the equivalent magnetic permeability of the Fabry-Perot resonant material along the x-axis direction and the equivalent magnetic permeability along the y-axis direction are both B, and the equivalent magnetic permeability along the z-axis direction is ∞.

9. The fully polarized Fabry-Perot resonant material according to claim 1, characterized in that: The equivalent relative dielectric constant and equivalent magnetic permeability of the Fabry-Perot resonant material both satisfy the form of diag(C, D, ∞) at the operating frequency, and the thickness of the Fabry-Perot resonant material 10 is equal to an integer multiple of the length of the operating wavelength in the z-axis direction; in the form of diag(C, D, ∞), C and D both represent real values; a three-dimensional coordinate system is constructed with the center of any sub-wavelength unit as the origin, and the equivalent relative dielectric constant and equivalent magnetic permeability both satisfy the form of diag(C, D, ∞), indicating that the equivalent relative dielectric constant of the Fabry-Perot resonant material 10 along the x-axis direction is C, the equivalent relative dielectric constant along the y-axis direction is D, and the equivalent relative dielectric constant along the z-axis direction is ∞, the equivalent magnetic permeability of the Fabry-Perot resonant material 10 along the x-axis direction is C, the equivalent magnetic permeability along the y-axis direction is D, and the equivalent magnetic permeability along the z-axis direction is ∞.

10. The fully polarized Fabry-Perot resonant material according to claim 1, characterized in that: The first dielectric plate, the second dielectric plate and the third dielectric plate are made of F4B dielectric; the first metal subwavelength open ring resonator, the second metal subwavelength open ring resonator and the bent metal structure are made of metal copper.

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