CN105789905A - Metal thin film antistructure based gyromagnetic substrate super surface - Google Patents
Metal thin film antistructure based gyromagnetic substrate super surface Download PDFInfo
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- CN105789905A CN105789905A CN201610107486.8A CN201610107486A CN105789905A CN 105789905 A CN105789905 A CN 105789905A CN 201610107486 A CN201610107486 A CN 201610107486A CN 105789905 A CN105789905 A CN 105789905A
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- antistructure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0086—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices having materials with a synthesized negative refractive index, e.g. metamaterials or left-handed materials
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Abstract
The invention relates to the fields of artificial microstructure electromagnetism and electromagnetic metamaterial, and particularly to a metal thin film antistructure based gyromagnetic substrate super surface. The invention provides the metal thin film antistructure based gyromagnetic substrate super surface; the super surface comprises np substrate unit structures, wherein each substrate unit structure comprises an upper layer artificial microstructure and a lower layer substrate; the upper layer artificial microstructure adopts an ultra-thin type patch structure with the thickness of less than 1mm under a microwave band of 1-2GHz, and is a perfect electric conductor material with trenches; and the lower layer substrate adopts a gyromagnetic material with an external magnetic field response characteristic. The super surface provided by the invention is quite thin in the overall volume, quite suitable for small-volume integrated electromagnetic devices, quite low in waveguide loss, and belongs to a lossless device; the transmission distance of electromagnetic waves in the waveguide is relatively long, so that the super surface can be used as a long-distance wave-guiding apparatus; and in addition, the gyromagnetic substrate super surface is simple to manufacture, relatively low in cost, and can be manufactured by adopting a simple PCB manufacturing process.
Description
Technical field
The present invention relates to artificial micro-structure electromagnetism and electromagnetism Meta Materials field, be based on artificial super surface and the research of the dynamic adjustable microwave device of gyromagnetism base combination, particularly relate to a kind of gyromagnet substrate based on metallic film antistructure and surpass surface.
Background technology
First the Fano resonance of Novel manual electromagnetic material be found in asymmetric resonant ring array, destroy the symmetry i.e. electromagnetic response of controllable Novel manual electromagnetic material of resonant element geometry, this artificial structure can be defined as fettering the Novel manual electromagnetic material of mode of resonance, and interaction strong between resonant element causes the appearance of Fano resonance.The research group of University of Southampton utilizes Novel manual electromagnetic material to achieve electromagnetically induced Transparency Phenomenon (EIT) in microwave section, avoid many difficult problems and the experiment condition of complexity of the transparent research field of conventional electromagnetically induced, they excite Fano phenomenon merely with double-decker, it is achieved that electromagnetically induced is transparent.Utilizing the Fano coupling between radiation mode and dark mould, surface plasma Novel manual electromagnetic material also can be shown that EIT phenomenon.The work such as the electromagnetically induced of terahertz wave band is transparent, the Fano effect of the free Novel manual electromagnetic material of comprehensive polarization and high-temperature superconductor Novel manual electromagnetic material are also reported successively.
The symmetric method of breaking controlling artificial super surface electromagnetism Fano and EIT response mainly has two kinds, and one is to break intrinsic symmetry, and one is to broken external symmetry.In recent years, the various reports breaking geometrical symmetry and spatial symmetry emerge in an endless stream, including using split ring resonator and asymmetric metal bar dimer etc..But, recently utilize the External field response characteristic of material self to realize Broken Symmetry, Time-reversal symmetry and spatial alternation symmetry is broken by introducing the adjustable yttrium-iron-garnet material of magnetic conductivity (YIG), reflectance factor is obtained in conjunction with coupled mode theory equation, and by the regulation and control to reflectance factor parameters, obtain controlled reflectance spectrum.It is possible not only to simple in construction, it is easy to preparation, and can freely regulate and control reflectivity and reflection characteristic, and its one-way in the case of not changing geometric parameter.
Summary of the invention
For defect or deficiency present in prior art, the technical problem to be solved is: provide a kind of proposition to introduce optically activ material substrate in the surface with antistructure antenna features.This super surface is due to the external magnetic field response characteristic of substrate, it is possible to inspire the symmetric pattern in antistructure antenna and asymmetric mode.The resonant frequency making both of which is close to each other, makes both scattered fields that relevant effect to occur, can realize the Fano line style on reflectance spectrum.The Q value of symmetric pattern is little, and reflectance spectrum is relatively wide, achieves the ability of bandreject filtering in the biggest frequency range.And the Q value of asymmetric mode is very big, reflectance spectrum peak value is sharp-pointed, can obtain again the bandpass filtering in the narrowest frequency range.In conjunction with this metallic film with antistructure and the dispersion relation on the super surface of gyromagnetic material substrate and band theory, give " energy band diagram " of asymmetric mode.Q value size and the position of resonance of asymmetric mode with the angle of inclination of flexible design incident light, can be realized according to " energy band diagram ".And exciting of asymmetric mode can be completely inhibited at special angle.
To achieve these goals, the technical scheme that the present invention takes is for providing a kind of gyromagnet substrate based on metallic film antistructure to surpass surface, and this super surface comprises npIndividual basic cell structure, npFor the integer more than or equal to 2, described base board unit structure includes upper strata artificial micro-structure and underlying substrate, its upper strata artificial micro-structure is ultrathin paster structure, its thickness is less than 1 millimeter in microwave band 1-2GHz, for the fluted perfect electrical conductor material of tool, its surface has the metallic film of antistructure antenna features, its underlying substrate is for having external magnetic field response characteristic gyromagnetic material, the symmetric pattern in antistructure antenna and asymmetric mode can be inspired, the resonant frequency making both of which is close to each other, there is relevant effect in the scattered field making both, the Fano line style on reflectance spectrum can be realized.
As a further improvement on the present invention, described basic cell structure comprises two identical parallel grooves of size, is not filled with any particular matter, for air in groove.
As a further improvement on the present invention, there are symmetric form and two kinds of resonance modes of antisymmetry type in described parallel groove.
As a further improvement on the present invention, the Q value of described symmetric form pattern is little, composes relatively wide, achieves the ability of bandreject filtering in the biggest frequency range；The Q value of described asymmetric pattern is very big, and reflectance spectrum peak value is sharp-pointed, can obtain again the bandpass filtering in the narrowest frequency range
As a further improvement on the present invention, described super surface controls the self-characteristic of gyromagnetic material by the power changing additional magnetostatic field, in the case of not changing physical dimension, can be realized the dynamic regulation of band resistance frequency range by regulation and control magnetostatic field size.
As a further improvement on the present invention, described perfect electrical conductor material is metal material, and described metal material includes copper, aluminium, iron.
As a further improvement on the present invention, having external magnetic field response characteristic gyromagnetic material described in is ferrite.
The invention has the beneficial effects as follows:
1. the super surface that the present invention proposes, structure is ultrathin paster structure, and its thickness is less than 1 millimeter in microwave band 1-2GHz.Super surface overall volume is the thinnest, is highly suitable to be applied for the integrated electromagnetic device of small size.
2. the metal on the super surface proposed due to the composition present invention is considered as perfect electric conductor at low-frequency band (1-2GHz), and therefore the loss of waveguide is the least, belongs to a kind of lossless device.Electromagnetic wave transmission range in this waveguide is longer can be used as remote guide wave device.
3. the super surface that the present invention proposes can control resonant position by controlling additional magnetostatic field, for by changing physical dimension, more convenient.
4. the present invention is simple except above-mentioned functional benefit is also equipped with making, and cost is relatively low, can simply use PCB processing technology to make.
Accompanying drawing explanation
Fig. 1 (a) surpasses schematic surface for gyromagnet substrate based on metallic film antistructure；
Fig. 1 (b) is the cellular construction on this super surface；
For research Babinet's principle schematic diagram in Fig. 2；
It Fig. 3 is the reflectivity frequency variation diagram with impinging microwave on this super surface；
Fig. 4 is corresponding to the intensity distribution in magnetic field at two mode resonance frequency；
Fig. 5 is " energy band diagram " of asymmetric mode in system；
Fig. 6 is reflectivity during special angle light incidence is with frequency variation diagram；
Wherein Fig. 1 (b) 1 is that surface micro-structure region is wherein 1 and 2 for air.
Detailed description of the invention
The present invention is further described for explanation and detailed description of the invention below in conjunction with the accompanying drawings.
As it is shown in figure 1, the present invention proposes a kind of gyromagnet substrate based on metallic film antistructure surpasses this super surface, surface, including two parts, upper strata is the perfect electric conductor with micro-structural, and lower floor is yttrium iron garnet, shown in its cellular construction such as accompanying drawing 1 (b).The cellular construction being understood this super surface by accompanying drawing 1 (b) comprises two grooves 1 and 2.Super surface comprises np(np>=2) individual basic cell structure, with n in accompanying drawing 1 (a)pAs a example by=4.This super surface that the present invention proposes is ultrathin paster structure in actual applications, and simple PCB processing technology can be used to make.
In order to carry out certain operations on reflectance spectrum, first have studied Babinet's principle.The antistructure of i.e. one structure and its correspondence relation between transmission and reflection, electric field and magnetic field.It has been observed that 1. 1 structures, transmission spectrum during TE ripple incidence is the most corresponding with reflectance spectrum during its antistructure TM ripple incidence；2. a structure, its eelctric dipole resonance, just corresponding with the resonance of the magnetic dipole of its antistructure.As shown in Figure 2.
In order to design the artificial micro-structure wanted, and understand the resonance characteristics of structure qualitatively, be analyzed illustrating initially with time domain coupled mode theory.The time domain coupled mode theory with two resonance modes is:
Wherein, ωaFor the resonant frequency of symmetric pattern, this resonance is strong with free space coupling, causes its loss big, for bright state (bright mode)；ωbFor the resonant frequency of asymmetric mode, owing to it directly can not be excited by outfield, weak with coupling of free space, it is lost low, for dark-state (dark mode).κ is the coefficient of coup between bright state and dark-state, is a plural number.A, b and SinDependence for the time is expressed as ei ω t.Further, a, b and SinAmplitude be all the value of reduction, α characterizes outfield and is coupled into the damped coefficient of bright state.Because dark-state can not be directly by outer field excitation, so being 0.
Abbreviation formula (1) obtains:
Therefore, the reflectance factor of this system can be obtained by solving (2).
By (3) formula it can be seen that in the case of the resonant frequency of both of which determines, coefficient of coup κ can determine reflection characteristic.
We combine accompanying drawing 3 and provide a concrete case study on implementation below.Substrate thickness h=8.75mm, length l=24.5mm of groove, width w=3.5mm.In region 1 and 2, material is set as that air, other materials are considered perfect electric conductor.Accompanying drawing 3 is the reflectivity change with frequency on the super surface obtained by FDTD method under this size.In the range of band in the biggest frequency range hinders as we can see from the figure, there is one section of narrow passband (near 6.502GHz).
In order to be further appreciated by YIG and the comprehensive function of oblique incidence microwave, we calculate " energy band diagram " (accompanying drawing 5) of asymmetric mode in this system.Finding that the resonant frequency of asymmetric mode and the size of Q value can change with impinging microwave angle of inclination, and exist a bit, the Q value of asymmetric mode dissipates (tending to infinitely great).In order to study the unusual appearance of divergence point, we find out the k that divergence point is correspondingxNumerical value is-0.18367.According to formula kx=ksin θ=ω sin θ/c, can be θ=-28.4 ° in the hope of now corresponding incidence angle.Control incident angle of light be θ=-28.4 °, 0 °, 28.4 ° time, utilize full-wave electromagnetic simulation calculation, try to achieve the reflectance spectrum (accompanying drawing 6) of three angles respectively.
When result display incident angle is θ=-28.4 °, reflectance spectrum is a smooth line, Fano line style does not occur.In " energy band diagram " that this and accompanying drawing 5 are calculated, the phenomenon of divergence point matches.At this Frequency point, the symmetry breaking caused by the symmetry breaking of gyromagnetic material substrate introducing and impinging microwave inclination achieves counteracting, thus completely inhibit exciting of asymmetric mode.This system, due to the most sharp-pointed peak and its one-way, can serve as sensitive angle detection.
Above content is to combine concrete preferred embodiment further description made for the present invention, it is impossible to assert the present invention be embodied as be confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, it is also possible to make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (7)
1. a gyromagnet substrate based on metallic film antistructure surpasses surface, it is characterised in that: this super surface comprises npIndividual basic cell structure, npFor the integer more than or equal to 2, described base board unit structure includes upper strata artificial micro-structure and underlying substrate, its upper strata artificial micro-structure is ultrathin paster structure, its thickness is less than 1 millimeter at microwave band 1-2 GHz, for the fluted perfect electrical conductor material of tool, its surface has the metallic film of antistructure antenna features, its underlying substrate is for having external magnetic field response characteristic gyromagnetic material, the symmetric pattern in antistructure antenna and asymmetric mode can be inspired, the resonant frequency making both of which is close to each other, there is relevant effect in the scattered field making both, the Fano line style on reflectance spectrum can be realized.
Gyromagnet substrate based on metallic film antistructure the most according to claim 1 surpasses surface, it is characterised in that: described basic cell structure comprises two identical parallel grooves of size, is not filled with any particular matter, for air in groove.
Gyromagnet substrate based on metallic film antistructure the most according to claim 2 surpasses surface, it is characterised in that: there are symmetric form and two kinds of resonance modes of antisymmetry type in described parallel groove.
Gyromagnet substrate based on metallic film antistructure the most according to claim 3 surpasses surface, it is characterised in that: the Q value of described symmetric form pattern is little, and reflectance spectrum is relatively wide, achieves the ability of bandreject filtering in the biggest frequency range；The Q value of described asymmetric pattern is very big, and reflectance spectrum peak value is sharp-pointed, can obtain again the bandpass filtering in the narrowest frequency range.
Gyromagnet substrate based on metallic film antistructure the most according to claim 1 surpasses surface, it is characterized in that: described super surface controls the self-characteristic of gyromagnetic material by the power changing additional magnetostatic field, the dynamic regulation of band resistance frequency range in the case of not changing physical dimension, can be realized by regulation and control magnetostatic field size.
Gyromagnet substrate based on metallic film antistructure the most according to claim 1 surpasses surface, it is characterised in that: described perfect electrical conductor material is metal material, and described metal material includes copper, aluminium, iron.
Gyromagnet substrate based on metallic film antistructure the most according to claim 1 surpasses surface, it is characterised in that having external magnetic field response characteristic gyromagnetic material described in: is ferrite.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108346858A (en) * | 2018-02-11 | 2018-07-31 | 苏州大学 | Control method, device and the equipment of non-linear nano-antenna scattering directionality |
| CN108832302A (en) * | 2018-05-03 | 2018-11-16 | 西安电子科技大学 | A kind of phase gradient super surface system in bifrequency biradial direction |
| CN109059971A (en) * | 2018-09-25 | 2018-12-21 | 桂林电子科技大学 | A kind of sensor of three hole crack structure |
| CN109581700A (en) * | 2018-12-04 | 2019-04-05 | 上海师范大学 | One kind is based on indium antimonide band micro-structure Terahertz modulator and preparation method thereof |
| CN109921193A (en) * | 2019-03-14 | 2019-06-21 | 南京邮电大学 | Bimodal class electromagnetically induced transparent unit and method based on two kinds of coupled modes |
| CN113589522A (en) * | 2021-06-30 | 2021-11-02 | 武汉大学 | Angle multiplexing super surface based on building structure parameter library and design method |
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| CN103296452A (en) * | 2012-02-29 | 2013-09-11 | 深圳光启创新技术有限公司 | Selective wave-transparent metamaterial and antenna housing |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108346858A (en) * | 2018-02-11 | 2018-07-31 | 苏州大学 | Control method, device and the equipment of non-linear nano-antenna scattering directionality |
| CN108346858B (en) * | 2018-02-11 | 2020-08-25 | 苏州大学 | Method, device and equipment for controlling scattering directivity of nonlinear nano antenna |
| CN108832302A (en) * | 2018-05-03 | 2018-11-16 | 西安电子科技大学 | A kind of phase gradient super surface system in bifrequency biradial direction |
| CN109059971A (en) * | 2018-09-25 | 2018-12-21 | 桂林电子科技大学 | A kind of sensor of three hole crack structure |
| CN109059971B (en) * | 2018-09-25 | 2024-04-30 | 桂林电子科技大学 | Sensor with three-hole seam structure |
| CN109581700A (en) * | 2018-12-04 | 2019-04-05 | 上海师范大学 | One kind is based on indium antimonide band micro-structure Terahertz modulator and preparation method thereof |
| CN109581700B (en) * | 2018-12-04 | 2022-07-29 | 上海师范大学 | Terahertz modulator based on indium antimonide strip microstructure and preparation method thereof |
| CN109921193A (en) * | 2019-03-14 | 2019-06-21 | 南京邮电大学 | Bimodal class electromagnetically induced transparent unit and method based on two kinds of coupled modes |
| CN113589522A (en) * | 2021-06-30 | 2021-11-02 | 武汉大学 | Angle multiplexing super surface based on building structure parameter library and design method |
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