CN107093805A - A kind of Terahertz broadband absorbs the design method of Meta Materials - Google Patents
A kind of Terahertz broadband absorbs the design method of Meta Materials Download PDFInfo
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- CN107093805A CN107093805A CN201710407421.XA CN201710407421A CN107093805A CN 107093805 A CN107093805 A CN 107093805A CN 201710407421 A CN201710407421 A CN 201710407421A CN 107093805 A CN107093805 A CN 107093805A
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- terahertz
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
- H01Q17/008—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems with a particular shape
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/002—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of materials engineered to provide properties not available in nature, e.g. metamaterials
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Abstract
The invention belongs to electro-magnetic wave absorption and radiation control field, more particularly to a kind of Terahertz broadband absorbs the design method of Meta Materials, according to effective media theory, and S parameter is obtained by simulation in the frequency-domain with CST microwave studios, periodic cells structure is periodic distribution in x and y directions, and is set to periodic boundary condition.The parameter S obtained with reference to scanning11And S21, calculate impedance value.By changing the cycle of cellular construction and the size of metallic film and dielectric material, corresponding absorption frequency is adjusted, multiple metallic films and dielectric material are intersected and are stacked in a unit cycle, make the corresponding absorption line superposition of different resonance round platforms.The present invention can effectively widen the absorption spectra of Terahertz frequency band, it is widened in frequency band of the absorptivity more than more than 90%, while also ensure that the relative absorbance bandwidth of certain altitude.And preceding 9 absworption peaks are caused by inside the cellular construction, so not influenceed by the cycle.
Description
Technical field
Meta Materials are absorbed the invention belongs to electro-magnetic wave absorption and radiation control field, more particularly to a kind of Terahertz broadband
Design method.
Background technology
Electromagnetism Meta Materials are the artificial materials that some geometry units are formed by periodic arrangement, and generally it has
Unusual physical property, therefore gather around and have broad application prospects, such as infrared detector, radar invisible, heat radiator.Nature
The absorbing material of presence due to its own impedance can not be with free space matches impedances, so in the presence of certain reflection, no
Electromagnetic wave can be fully absorbed；Nature material is difficult to have high loss in very wide frequency range simultaneously, so the volume of absorbing material
All than larger, bandwidth suffers from limitation.
2008, boston, U.S.A institute professor W.Padilla etc. proposed a kind of based on artificial electromagnetic medium first
Microwave band perfection absorbing material, passes through reasonable design cellular construction so that effective dielectric constant and magnetic conductivity are in certain frequency
On not only real part it is equal, its imaginary part is also identical, so that impedance is matched completely with the impedance of free space, allows incidence wave
All it can almost be absorbed by lossy artificial electromagnetic medium.
Although artificial electromagnetic medium can realize that ultra-thin, polarize the characteristic such as insensitive, is due to very in any wave band
Many Absorber Bandwidths are all narrow.Therefore, widening the suction wavestrip of artificial electromagnetic medium absorbing material wide turns into a study hotspot.
The content of the invention
The purpose of the present invention is that there is provided the design that a kind of Terahertz broadband absorbs Meta Materials in view of the shortcomings of the prior art
Method.
Terahertz broadband absorbs Meta Materials by periodic unit structure composition, tmIt is the metallic film made of gold element, gold
Electrical conductivity be σ=4.09 × 107s/m, tdIt is the dielectric layer material done by conventional organic high molecular polymer, its relative Jie
Electric constant ε=3.5+0.2i.The bottom is metal base plate, is made up of above-mentioned metallic film, and thickness is tm=0.2 μm, it is wide
P is spent as the cycle of whole frustum cone structure.The superstructure of metal base plate is the core of the structure, and each layer is that the cycle is single
Member, is stacked by dielectric layer material and metallic film and formed, and totally 10 layers, each layer of thickness of metal film keeps constant, is tm
=0.2 μm, the thickness t of dielectric layer materiald8.7 μm, 7.2 μm, 6.1 μm, 5.2 μm, 4.5 μm, 3.9 μ are then followed successively by from lower to upper
M, 3 μm, 2.7 μm, 2.4 μm.We peel off the method that is combined using ultraviolet photolithographic and metal deposit to process each layer of gold
Belong to resonance structure, the buffer layer between metal is realized by spin coating high polymer material, the relative position of different metal layer
It is aligned by marking.Round platform whole height is T=49.1 μm, and the cycle is P=95 μm, and top length is Wt=39.7 μm, bottom
Minister's degree is Wb=79 μm.
Step (1) is determined according to effective media theory, the performance of Meta Materials Terahertz material by magnetic permeability μ and permittivity ε
It is fixed, and reflectivity R (ω) and transmissivity T (ω) depends on refractive index n and wave impedance Z, with magnetic permeability μ and permittivity ε phase
Close；
By FInite Element, emulation obtains S parameter, uses frequency-domain calculations pattern TM polarized waves during emulation, and magnetic field is along y side
To, can be as driving source along z directions vertical irradiation to absorbent structure in emulation perpendicular to x-z-plane；X directions are week
Phase property border；
Incorporating parametric scanning result, obtain only single scale resonant cells Meta Materials Terahertz absorbing material it is optimal
Absorption curve, while the parameter S obtained according to entry port and exit ports11And S21, so as to calculate equiva lent impedance Z.
Step (2) adjusts corresponding inhale by changing the cycle of cellular construction and the size of metallic film and dielectric material
Frequency is received, multiple metallic films and dielectric material were stacked in a unit cycle, makes the corresponding suction of different resonance round platforms
Receive Spectral Overlapping.
The present invention can effectively widen the absorption spectra of Terahertz frequency band, it is obtained in frequency band of the absorptivity more than more than 90%
To widening, while the relative absorbance bandwidth of certain altitude is also ensure that, and preceding 9 absworption peaks are caused inside the cellular construction
, so not influenceed by the cycle.
Brief description of the drawings
Fig. 1 is Terahertz wide-band and wave-absorbing structural representation.
Fig. 2 is the structural representation of single-layer metal piece and macromolecule organic material.
Fig. 3 is the absorption curve of Terahertz wide-band and wave-absorbing structure.
Fig. 4 is the real part curve of the impedance value extracted.
The absorption spectra that Fig. 5 is obtained when being different cycles.
Embodiment
The invention will be further described in conjunction with the accompanying drawings and embodiments for figure below.
A kind of Terahertz broadband absorbs the design method of Meta Materials, comprises the following steps：
Step (1) is determined according to effective media theory, the performance of Meta Materials Terahertz material by magnetic permeability μ and permittivity ε
It is fixed, and reflectivity R (ω) and transmissivity T (ω) depends on refractive index n and wave impedance Z, with magnetic permeability μ and permittivity ε phase
Close；
Reflectivity R (ω) and transmissivity T (ω), Ss relevant with S parameter11For reflectance factor, S21For transmission coefficient, wherein
Reflectivity R (ω)=| S11|2, transmissivity T (ω)=| S21|2；
By FInite Element, emulation obtains S parameter.Frequency-domain calculations pattern TM polarized waves are used during emulation, magnetic field is along y side
To, can be as driving source along z directions vertical irradiation to absorbent structure in emulation perpendicular to x-z-plane；X directions are week
Phase property border；
The absorptivity A (ω) of Terahertz absorbing material is expressed as：
A (ω)=1-T (ω)-R (ω)=1- | S21|2-|S11|2
By S parameter, the equivalent wave impedance Z of Terahertz broadband absorbing material is obtained；
With reference to the parameter scan results of numerical computations, the Meta Materials Terahertz for obtaining only single scale resonant cells inhales ripple
The optimal absorption curve of material, while the parameter S obtained according to entry port and exit ports11And S21, so as to calculate equivalent
Impedance Z；
Step (2) adjusts corresponding inhale by changing the cycle of cellular construction and the size of metallic film and dielectric material
Frequency is received, multiple metallic films and dielectric material are stacked in a cycle unit, makes the corresponding suction of different resonance round platforms
Receive Spectral Overlapping.
As depicted in figs. 1 and 2, described Terahertz broadband absorbs Meta Materials, includes the metal base plate of the bottom, by gold
Belong to film composition, metallic film is made up of gold element, golden electrical conductivity is σ=4.09 × 107S/m, thickness is tm=0.2 μm,
Its width P as whole frustum cone structure cycle；The core that the top of metal base plate is, core is by 10 layers of cycle list
Member is laminated, and every layer of periodic unit is stacked by dielectric layer material and the metallic film and formed, every layer of thickness of metal film
It is identical, it is tm=0.2 μm, dielectric layer material is made up of organic high molecular polymer, relative dielectric constant ε=3.5+0.2i,
Thickness td8.7 μm, 7.2 μm, 6.1 μm, 5.2 μm, 4.5 μm, 3.9 μm, 3 μm, 2.7 μm, 2.4 μm are then followed successively by from lower to upper；Adopt
The method that is combined is peeled off with ultraviolet photolithographic and metal deposit to process the medium between each layer of metal resonance structure, metal
Separation layer realizes that the relative position of different metal layer is aligned by marking by spin coating high polymer material；Resonance round platform is whole
Body is highly T=49.1 μm, and the cycle is P=95 μm, and top length is Wt=39.7 μm, bottom lengths are Wb=79 μm.
As shown in Figure 3 and Figure 5, in absorption bands, the real part of impedance value is close to 1, and free space can be realized very
Good impedance matching, reduces reflectivity, obtains very high absorptivity.
Show as shown in figure 4, can be seen that simulation result by simulation result, the structure is in 1.29THz~2.34TH frequencies
The absorptivity of rate scope is more than 90%, and relative absorbance bandwidth can reach 57.85%, is provided simultaneously with polarization insensitive excellent with wide-angle etc.
Point.
Step (2) adjusts corresponding inhale by changing the cycle of cellular construction and the size of metallic film and dielectric material
Frequency is received, multiple metallic films and dielectric material were stacked in a unit cycle, makes the corresponding suction of different resonance round platforms
Receive Spectral Overlapping.
The present invention can effectively widen the absorption spectra of Terahertz frequency band, it is obtained in frequency band of the absorptivity more than more than 90%
To widening, while also ensure that the relative absorbance bandwidth of certain altitude.And preceding 9 absworption peaks are caused inside the cellular construction
, so not influenceed by the cycle.
Claims (2)
1. a kind of Terahertz broadband absorbs the design method of Meta Materials, it is characterised in that comprise the following steps：
Step (1) determines according to effective media theory, the performance of Meta Materials Terahertz material by magnetic permeability μ and permittivity ε, and
Reflectivity R (ω) and transmissivity T (ω) depends on refractive index n and wave impedance Z, related to magnetic permeability μ and permittivity ε；
Using FInite Element, numerical computations obtain S parameter, and frequency-domain calculations pattern TM polarized waves are used during emulation, and magnetic field is along y side
To, can be as driving source along z directions vertical irradiation to absorbent structure in emulation perpendicular to x-z-plane；X directions are week
Phase property border；
Incorporating parametric scanning result, obtains the optimal absorption of the Meta Materials Terahertz absorbing material of only single scale resonant cells
Curve, while the parameter S obtained according to entry port and exit ports11And S21, so as to calculate equiva lent impedance Z.
Step (2) adjusts corresponding absorb frequently by changing the cycle of cellular construction and the size of metallic film and dielectric material
Rate, multiple metallic films and dielectric material are stacked in a cycle unit, make the different corresponding absorption spectras of resonance round platform
Line is superimposed.
2. a kind of Terahertz broadband according to claim 1 absorbs the design method of Meta Materials, it is characterised in that described
Terahertz broadband absorb Meta Materials, include the metal base plate of the bottom, be made up of metallic film, metallic film is by gold dollar
Element is made, and golden electrical conductivity is σ=4.09 × 107S/m, thickness is tm=0.2 μm, its width P as whole frustum cone structure week
Phase；The core that the top of metal base plate is, core is laminated by 10 layers of periodic unit, and every layer of periodic unit is by being situated between
Matter layer material and the metallic film, which are stacked, to be formed, and every layer of thickness of metal film is identical, is tm=0.2 μm, dielectric layer material
Expect to be made up of organic high molecular polymer, relative dielectric constant ε=3.5+0.2i, thickness td8.7 μm are then followed successively by from lower to upper,
7.2 μm, 6.1 μm, 5.2 μm, 4.5 μm, 3.9 μm, 3 μm, 2.7 μm, 2.4 μm；Peeled off and mutually tied with metal deposit using ultraviolet photolithographic
The method of conjunction processes the buffer layer between each layer of metal resonance structure, metal by spin coating high polymer material come real
Existing, the relative position of different metal layer is aligned by marking；Resonance round platform whole height is T=49.1 μm, and the cycle is P=95
μm, top length is Wt=39.7 μm, bottom lengths are Wb=79 μm.
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Cited By (6)
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|---|---|---|---|---|
| CN109521504A (en) * | 2017-09-20 | 2019-03-26 | 苏州大学 | A kind of THz wave absorbing structure |
| CN109861004A (en) * | 2019-01-15 | 2019-06-07 | 四川大学 | The strong magnetic response wide frequency band negative permeability Meta Materials of all band |
| CN110277649A (en) * | 2019-06-27 | 2019-09-24 | 南京理工大学 | Circuit analogous absorber based on micro-meter scale periodic unit |
| CN113540820A (en) * | 2021-07-20 | 2021-10-22 | 合肥工业大学 | Stepped cylindrical resonance structure and absorber of multi-frequency electromagnetic waves |
| CN114239163A (en) * | 2021-12-03 | 2022-03-25 | 中国人民解放军军事科学院国防科技创新研究院 | Random topology based microstructure generation and joint simulation evaluation method for metamaterial |
| CN114865327A (en) * | 2022-04-22 | 2022-08-05 | 电子科技大学 | Attenuator composed of resonant ring array |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109521504A (en) * | 2017-09-20 | 2019-03-26 | 苏州大学 | A kind of THz wave absorbing structure |
| CN109521504B (en) * | 2017-09-20 | 2021-02-05 | 苏州大学 | Terahertz wave absorption structure |
| CN109861004A (en) * | 2019-01-15 | 2019-06-07 | 四川大学 | The strong magnetic response wide frequency band negative permeability Meta Materials of all band |
| CN110277649A (en) * | 2019-06-27 | 2019-09-24 | 南京理工大学 | Circuit analogous absorber based on micro-meter scale periodic unit |
| CN113540820A (en) * | 2021-07-20 | 2021-10-22 | 合肥工业大学 | Stepped cylindrical resonance structure and absorber of multi-frequency electromagnetic waves |
| CN113540820B (en) * | 2021-07-20 | 2023-01-17 | 合肥工业大学 | Stepped cylindrical resonance structure and absorber of multi-frequency electromagnetic waves |
| CN114239163A (en) * | 2021-12-03 | 2022-03-25 | 中国人民解放军军事科学院国防科技创新研究院 | Random topology based microstructure generation and joint simulation evaluation method for metamaterial |
| CN114865327A (en) * | 2022-04-22 | 2022-08-05 | 电子科技大学 | Attenuator composed of resonant ring array |
| CN114865327B (en) * | 2022-04-22 | 2024-01-26 | 电子科技大学 | Attenuator formed by resonant ring array |
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Application publication date: 20170825 |