CN109861004B - Full-band strong magnetic response broadband negative magnetic permeability metamaterial - Google Patents
Full-band strong magnetic response broadband negative magnetic permeability metamaterial Download PDFInfo
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Abstract
The invention discloses a full-wave-band strong magnetic resonance single-layer metamaterial. The single-layer metamaterial is composed of a hole-shaped structure substrate and a good conductor metal resonance structure attached to the hole of the substrate. When the electromagnetic wave is vertically incident, the magnetic field component directly excites the magnetic resonance of the metamaterial, so that high positive permeability and negative permeability are obtained near the resonance frequency. Under the same structural form, the invention can directly excite strong magnetic response in microwave, terahertz wave and optical wave bands only by adjusting the structural parameters of the metamaterial. The metamaterial has the advantages of simple structure, convenience in processing, thin thickness, small size and the like, and can be applied to the fields of design of negative-refractive-index metamaterials and the like.
Description
The technical field is as follows:
the invention relates to a negative magnetic conductivity metamaterial, in particular to a porous structure all-band strong magnetic response broadband negative magnetic conductivity metamaterial.
Background art:
the metamaterial is an artificial composite material, and the unit structure of the metamaterial is designed to realize that an external electromagnetic field generates a singular electromagnetic response which is not possessed by the nature. The electromagnetic properties of a metamaterial depend on its unit structure, i.e. microstructure. Since the unit size of the microstructure is smaller than the wavelength of the incident electromagnetic wave, the metamaterial may be considered uniform with respect to the incident electromagnetic wave, i.e., the electromagnetic properties of the metamaterial may be characterized by a space-independent equivalent dielectric constant and equivalent permeability. The special properties of metamaterials have attracted great interest to researchers at home and abroad, and many novel metamaterials such as negative-refractive-index metamaterials, zero-refractive-index metamaterials, negative-permeability metamaterials and the like are designed. The metamaterial with negative magnetic permeability can enhance the imaging effect of electromagnetic waves and improve the energy transmission performance compared with a common lens in imaging application. However, since the magnetic response of most magnetic substances in nature has a high-frequency cutoff characteristic, the magnetic response of microwaves, terahertz waves, and optical bands in higher frequency bands is very weak, and the operating bandwidth of negative permeability is narrow. Therefore, the high-frequency strong magnetic resonance broadband negative magnetic permeability metamaterial becomes an important research hotspot.
The main technical approach of the negative magnetic permeability metamaterial is to enable the magnetic field component of incident electromagnetic waves to penetrate through an open resonant ring or induce the local magnetic response of an atomic or molecular level resonant structure in a multilayer overlapping mode, so that the local magnetic response is represented as negative magnetic permeability on the macroscopic property. In order to allow the magnetic field component of the incident electromagnetic wave to pass through the split ring resonator to directly excite the magnetic response, a planar split ring resonator and a vertical split ring resonator have been designed. The planar open-ended resonant ring needs to adopt a side incidence mode, so that the application of the planar open-ended resonant ring is greatly limited, the planar open-ended resonant ring is difficult to apply to higher terahertz wave bands and optical wave bands only by changing structural parameters under the condition that the structure is not changed, the vertical open-ended resonant ring structure not only increases the processing difficulty of the micro-structural unit, but also introduces stronger double anisotropy, so that the double negative refractive index frequency band of the vertical open-ended resonant ring is narrowed, and the vertical open-ended resonant ring is also difficult to apply to the optical wave bands only by changing the structural parameters. For the technical approach of realizing magnetic response by multilayer superposition, strong magnetic response is difficult to realize generally, and the processing difficulty of the centrosymmetric resonance structure is very high, so that the expanding application of the centrosymmetric resonance structure to terahertz wave bands and optical wave bands is limited. In addition, although many different structures of the negative permeability metamaterial have been proposed, the metamaterial is difficult to make good universality in the microwave to optical bands only by changing the size of the unit structure while keeping the structure unchanged. Therefore, the development of a broadband negative-permeability metamaterial with full-band strong magnetic response and a simple structure is particularly important for promoting the application of the terahertz technology.
In summary, we provide a full-band strong magnetic response broadband negative magnetic conductivity metamaterial based on a porous structure. The structure can realize strong magnetic response in microwave, terahertz wave and optical wave bands by changing the size of the unit structure, and further obtain broadband negative magnetic conductivity in different wave bands. The structure can be combined with a corresponding structure according to different application requirements and applied to the fields of negative refractive index and the like.
The invention content is as follows:
the invention provides a full-band strong magnetic response broadband negative magnetic conductivity metamaterial aiming at the defects and shortcomings in the design of the conventional negative magnetic conductivity artificial metamaterial.
The technical scheme adopted by the invention is to provide a full-band strong magnetic response broadband negative magnetic conductivity metamaterial, which is characterized in that: 1. the metamaterial is composed of array-type structural units, wherein each structural unit comprises a porous structural substrate and a metal resonance structure attached to each substrate hole; 2. the strong magnetic response can be realized in microwave, terahertz wave and optical wave bands only by changing the period and the thickness of the negative magnetic conductivity metamaterial, the size of the substrate hole structure and the size of the resonant structure.
The dielectric layer material may be, but is not limited to, teflon, polyimide, which is a flexible material, or sapphire, which is a non-flexible material.
Wherein the substrate pore structure may be, but is not limited to, a square or circular pore.
Wherein the metal resonance material may be, but is not limited to, gold, silver, or copper.
Wherein the metal resonant structure may be, but is not limited to, a closed-loop resonant structure or an open-loop resonant structure.
Furthermore, the period of the metamaterial unit structure, the material of the dielectric layer, the thickness of the dielectric layer, the shape of the hole, the size of the hole, the material of the metal resonance structure and the thickness of the metal resonance structure are set according to different frequency bands and application scenes, and then corresponding functions are achieved.
Furthermore, the single-layer negative magnetic permeability metamaterial resonance structure can realize the functions of adjusting the resonance frequency and the corresponding negative magnetic permeability by only changing the structure size when keeping the structure unchanged.
Compared with the prior art, the technology of the invention has the following advantages: 1. according to the strong magnetic resonance negative magnetic conductivity metamaterial provided by the invention, strong magnetic response can be realized in microwave, terahertz wave and optical wave bands only by changing the size of the unit structure of the negative magnetic conductivity metamaterial; 2. the strong magnetic resonance negative magnetic permeability metamaterial provided by the invention can effectively enhance the magnetic field at the resonance structure and can realize great magnetic permeability or negative magnetic permeability; 3. when incident electromagnetic waves vertically enter the metamaterial with strong magnetic resonance and negative magnetic permeability, the magnetic field at the resonance frequency is mainly localized in the range surrounded by the resonance structure, so that the structure is combined with other structures to generate smaller coupling effect, and the metamaterial with strong magnetic resonance and negative magnetic permeability is more beneficial to realizing other functions through structural combination; 4. compared with a plurality of existing magnetic resonance structures or technical approaches, the unit structure of the strong magnetic resonance negative magnetic permeability metamaterial provided by the invention is simpler, and the single-layer structure is thinner, so that the processing and system integration can be realized.
Description of the drawings:
in order to more clearly describe the embodiments of the present invention in further detail, the drawings used in the embodiments will be briefly described below. It is to be noted herein that the appended drawings illustrate only further described embodiments of the invention and are therefore not to be considered limiting of its scope.
Fig. 1 is a schematic structural diagram of a negative permeability metamaterial according to embodiments 1, 2 and 3 of the present invention, wherein the metamaterial is composed of a polyimide square hole structure and a metal square hole made of gold.
Fig. 2 is a schematic side view of the negative permeability metamaterial according to the embodiment 1, the embodiment 2 and the embodiment 3 of the present invention at normal incidence of TE waves.
Fig. 3 is a schematic side view of the negative permeability metamaterial according to the embodiment 1, 2 and 3 of the present invention at normal incidence of TM waves.
FIG. 4 is a graph of the real part of the permeability and the transmittance of the negative permeability metamaterial according to embodiment 1 of the invention at the normal incidence of the TE wave in the microwave band along with the change of the operating frequency.
FIG. 5 is a graph of the real part of the permeability and the transmittance of the negative permeability metamaterial according to embodiment 1 of the invention at the normal incidence of the TM wave in the microwave band along with the change of the operating frequency.
FIG. 6 is a graph showing the real part of the permeability and the change of the transmittance of the negative permeability metamaterial according to embodiment 2 of the present invention along with the operating frequency at normal incidence of a TE wave in the terahertz wave band.
FIG. 7 is a graph showing the real part of the permeability and the change of the transmittance of the negative permeability metamaterial according to embodiment 2 of the invention along with the change of the operating frequency at the normal incidence of the terahertz waveband TM wave.
FIG. 8 is a graph showing the real part of the permeability and the change of the transmittance with the operating frequency of the negative permeability metamaterial according to embodiment 3 of the present invention at the normal incidence of the TE wave in the optical band.
FIG. 9 is a graph showing the real part of the permeability and the change of the transmittance with the operating frequency of the negative permeability metamaterial according to embodiment 3 of the present invention at normal incidence of the optical band TM wave.
In the figure: 1 is a porous dielectric structure, and 2 is a metal resonance structure.
The specific embodiment is as follows:
according to the design method, the design scheme in the embodiment of the invention is clearly and completely described by combining the drawings in the embodiment; the described embodiments are only some of the embodiments of the present invention and are not meant to limit the scope of the present invention in any way.
Example 1
A microwave band strong magnetic response broadband negative magnetic conductivity metamaterial based on a porous structure is composed of a square porous structure substrate 1 made of polyimide and a metal square ring resonance structure 2 made of good conductor gold, and is shown in the attached drawing 1. The polyimide had a dielectric constant of 3.5 and a loss of 0.0027 siemens/m. As an example, the period of the structural unit is 10 mm, the thickness of the metal resonant structure is 0.002 mm, and the thickness of the single-layer resonant structure is 0.1 mm.
Fig. 2 is a schematic diagram of the negative-permeability metamaterial in the embodiment when a TE wave is perpendicularly incident, and fig. 4 is a change curve of a real part of permeability and transmittance of the negative-permeability metamaterial with frequency when the TE wave is perpendicularly incident in the embodiment. The resonant frequency of the negative magnetic permeability metamaterial is 9.97 GHz; the magnetic permeability of the metamaterial is negative in the range of up to 4.16GHz between 10.01GHz and 14.17GHz, and is up to-89.65 at 9.97 GHz; in addition, the magnetic permeability of the metamaterial is as high as 1103.00 at 10.05 GHz.
Fig. 3 is a schematic diagram of the negative permeability metamaterial in the embodiment when a TM wave is perpendicularly incident, and fig. 5 is a graph of a change of a real permeability part and a transmittance of the negative permeability metamaterial with frequency when a TE wave is perpendicularly incident. The resonant frequency of the negative magnetic permeability metamaterial is 10.08 GHz; the magnetic permeability of the metamaterial is negative within the range of 3.58GHz between 10.09GHz and 13.67GHz, and can reach-2133.02 at 10.09 GHz; in addition, the magnetic permeability of the metamaterial is as high as 28138.69 at 9.99 GHz.
Example 2
The terahertz wave band strong magnetic response broadband negative magnetic permeability metamaterial based on the porous structure is composed of a square porous structure substrate 1 made of polyimide and a metal square ring resonance structure 2 made of good conductor gold, and is shown in the attached drawing 1. The polyimide had a dielectric constant of 3.5 and a loss of 0.0027 siemens/m. As an example, the period of the structural unit is 30 micrometers, the thickness of the metal resonant structure is 0.2 micrometers, and the thickness of the single-layer resonant structure is 3.5 micrometers.
Fig. 2 is a schematic diagram of the negative-permeability metamaterial in the embodiment when a TE wave is perpendicularly incident, and fig. 6 is a change curve of a real part of permeability and transmittance of the negative-permeability metamaterial with frequency when the TE wave is perpendicularly incident in the embodiment. The resonant frequency of the negative magnetic permeability metamaterial is 3.77 THz; the magnetic permeability of the metamaterial is negative in the range of 1.42THz between 3.78THz and 5.72THz, and can reach-126.00 at the position of 3.81 THz; furthermore, the magnetic permeability of the metamaterial is as high as 2850.00 at 3.74 THz.
Fig. 3 is a schematic diagram of the negative permeability metamaterial in the embodiment when a TM wave is perpendicularly incident, and fig. 7 is a graph of a change of a real permeability part and a transmittance of the negative permeability metamaterial with frequency when a TE wave is perpendicularly incident. The resonant frequency of the negative magnetic permeability metamaterial is 3.80 THz; the magnetic permeability of the metamaterial is negative in the range of 2.12THz between 3.80THz and 5.92THz, and can reach-148.80 at the position of 3.82 THz; furthermore, the magnetic permeability of the metamaterial is as high as 2689.00 at 3.75 THz.
Example 3
The hole-structure-based optical wave band strong magnetic response broadband negative magnetic conductivity metamaterial is composed of a square hole-structure substrate 1 made of polyimide and a metal square ring resonant structure 2 made of good conductor gold, and is shown in the attached drawing 1. The polyimide had a dielectric constant of 3.5 and a loss of 0.0027 siemens/m. As an example, the period of the structural unit is 400 nanometers, the thickness of the metal resonance structure is 60 nanometers, and the thickness of the single-layer resonance structure is 39 nanometers.
Fig. 2 is a schematic diagram of the negative-permeability metamaterial in the embodiment when a TE wave is perpendicularly incident, and fig. 8 is a change curve of a real part of permeability and transmittance of the negative-permeability metamaterial with frequency when the TE wave is perpendicularly incident in the embodiment. The resonant frequency of the negative magnetic permeability metamaterial is 0.30 PHz; the magnetic permeability of the metamaterial is negative within the range of 0.20PHz between 0.30PHz and 0.50PHz, and can reach-69.54 at 0.31 PHz; furthermore, the magnetic permeability of the metamaterial is as high as 852.40 at 0.29 PHz.
Fig. 3 is a schematic diagram of the negative permeability metamaterial in the embodiment when a TM wave is perpendicularly incident, and fig. 9 is a graph of a change of a real permeability part and a transmittance of the negative permeability metamaterial with frequency when a TE wave is perpendicularly incident. The resonant frequency of the negative magnetic permeability metamaterial is 0.30 PHz; the magnetic permeability of the metamaterial is negative within the range of 0.20PHz between 0.30PHz and 0.50PHz, and can reach-69.54 at 0.31 PHz; furthermore, the magnetic permeability of the metamaterial is as high as 852.40 at 0.29 PHz.
In summary, the full-band strong-magnetic-response broadband negative-permeability metamaterial based on the porous structure can realize strong magnetic response in microwave, terahertz wave and optical bands only by changing the size of the unit structure, and further regulate and control the resonant frequency and the negative permeability of the metamaterial. The metamaterial has the advantages of simple structure, strong magnetic resonance, extremely high negative magnetic conductivity and the like, and the substrate hole structure and the metal structure can be set according to specific application requirements, so that the metamaterial has flexibility.
The technical principle and specific examples applied to the invention are described above, and the equivalent or equivalent designs, modifications and the like made according to the conception of the invention should be included in the protection scope of the invention.
Claims (4)
1. The utility model provides a full wave band strong magnetic response broadband negative permeability metamaterial based on poroid structure which characterized in that: the structural unit of the negative magnetic permeability metamaterial is divided into a porous structure substrate and a metal ring resonant structure attached to the inner wall of a hole of the substrate to form a metal resonant cavity; the negative magnetic conductivity metamaterial can realize strong magnetic response in microwave, terahertz wave and optical bands by changing the period, the thickness, the sizes of the substrate porous structure and the resonance structure.
2. The full-band strong-magnetic-response broadband negative-permeability metamaterial according to claim 1, wherein: the strong magnetic response of the negative permeability metamaterial is realized by directly exciting the magnetic resonance of the metamaterial by the magnetic field component of incident electromagnetic waves.
3. The full-band strong-magnetic-response broadband negative-permeability metamaterial according to claim 1, wherein: the strong magnetic response of the negative magnetic conductivity metamaterial can realize broadband negative magnetic conductivity.
4. The full-band strong-magnetic-response broadband negative-permeability metamaterial according to claim 1, wherein: the strong magnetic response of the negative permeability metamaterial can realize high negative permeability and positive permeability.
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| US8197887B1 (en) * | 2009-07-30 | 2012-06-12 | Sandia Corporation | Three-dimensional metamaterials |
| WO2013190532A2 (en) * | 2012-06-22 | 2013-12-27 | Tagsys | Circularly polarized compact helical antenna |
| CN105552542A (en) * | 2016-01-14 | 2016-05-04 | 中国矿业大学(北京) | K-waveband electromagnetic double-negative metamaterial |
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| CN102544744A (en) * | 2011-10-28 | 2012-07-04 | 深圳光启高等理工研究院 | Metamaterial with three-dimensional microstructure |
| TWI472819B (en) * | 2013-02-06 | 2015-02-11 | Nat Applied Res Laboratories | Metamaterial structure and the method of manufacturing the same |
| CN104617356B (en) * | 2015-01-09 | 2017-06-27 | 中国矿业大学(北京) | A kind of Three-Dimensional Isotropic negative magnetoconductivity structure and preparation method thereof |
| CN105896098B (en) * | 2016-04-25 | 2019-03-01 | 中国工程物理研究院激光聚变研究中心 | A kind of broadband Terahertz meta-material absorber absorbing superposition based on multi-resonant |
| CN107093805A (en) * | 2017-06-02 | 2017-08-25 | 湖北工业大学 | A kind of Terahertz broadband absorbs the design method of Meta Materials |
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| US8197887B1 (en) * | 2009-07-30 | 2012-06-12 | Sandia Corporation | Three-dimensional metamaterials |
| WO2013190532A2 (en) * | 2012-06-22 | 2013-12-27 | Tagsys | Circularly polarized compact helical antenna |
| CN105552542A (en) * | 2016-01-14 | 2016-05-04 | 中国矿业大学(北京) | K-waveband electromagnetic double-negative metamaterial |
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