CN107275791A - Artificial surface phasmon coupler based on the super surface of transmission-type phase gradient - Google Patents
Artificial surface phasmon coupler based on the super surface of transmission-type phase gradient Download PDFInfo
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- CN107275791A CN107275791A CN201710451566.XA CN201710451566A CN107275791A CN 107275791 A CN107275791 A CN 107275791A CN 201710451566 A CN201710451566 A CN 201710451566A CN 107275791 A CN107275791 A CN 107275791A
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- phase gradient
- super surface
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- phasmon
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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
Abstract
The invention discloses the artificial surface phasmon coupler based on the super surface of transmission-type phase gradient, it is related to artificial surface phasmon technical field, including the super surface of phase gradient and square patch array, the super surface of phase gradient is located at directly over side's patch array, therebetween with gap.The dispersion relation of its intrinsic artificial surface phasmon is can adjust by regulation side's patch length so that in certain bandwidth, the intrinsic wave vector of artificial surface phasmon is approximately equal to the wave vector of excited state surface wave in square patch array.So, in the surface wave resonance side of the being coupled to patch array that the super surface of phase gradient can be produced, the final eigenstate artificial surface phasmon for being coupled as broadband, and low-loss long-range is propagated in square patch array, improves the efficiency that propagating wave is converted into artificial surface phasmon.The invention provides technological approaches to design and making high performance artificial phasmon equipment.
Description
Technical field
The present invention relates to phasmon technical field, the more particularly to labor statement based on the super surface of transmission-type phase gradient
Face phasmon coupler.
Background technology
Surface phasmon (Surface Plasmon Polariton, SPP) is that electromagnetism evanscent field and electronic are strong
Coupling is produced, the hybrid electromagnetic mould that height localization is on two media interface.Due to its strong surface localization characteristic, surface
Phasmon has many unusual electromagnetic propertys, and such as sub-wavelength transmission characteristic, field enhancing characteristic, slow wave characteristic, phase are dashed forward
Become characteristic etc..Just because of these novel characteristics, surface phasmon novel microwave/optics, super-resolution imaging,
There is important potential using value in terms of high sensitivity sensing, be one of hot issue of recent domestic academia.
Due to can only be in the efficient excitating surface phasmon pattern of optical frequencies, initially on surface etc. by nature material
Research from excimer is concentrated mainly on optical frequencies.With deepening continuously for research, surface phasmon research is gradually expanded to micro-
Wave frequency section, i.e. artificial surface phasmon SSpoof SPP).Artificial surface etc. is typically realized by artificial cycle structure at present
From exciting for excimer, mainly there are three kinds of technological approaches：Optical grating construction, metallization structure surface, super surface.First two technological approaches
All run into the problem of efficiency is low.Super surface is the two dimensional surface situation of Meta Materials, is made up of sub-wavelength structure cell array
Man-made structurization surface.Due to the phase gradient on its surface, super surface can provide " the artificial wave vector " parallel to its surface, energy
The enough control realized to being incident to electromagnetic transmission direction thereon.Especially, when super surface provide " artificial wave vector " be more than into
Can be from sharp along artificial surface of super surface interface surface propagation etc. by incident electromagnetic wave efficient coupling during the wave vector of radio magnetic wave
Member.
However, the eigen mode of the artificial surface phasmon not electromagnetic wave produced based on super surface, but enter radio
Excited state under magnetic wave driving, serious scattering will be undergone before it is coupled into surface wave eigenstate.Fortunately, square paster battle array
It is disbursed from the cost and expenses and holds the propagation of eigenstate artificial surface phasmon, its dispersion relation can be tied by patch length, dielectric thickness, dielectric constant etc.
Structure parameter regulates and controls.So utilization side's patch array, can design the artificial surface phasmon coupler of eigenstate.But mesh
The preceding surface phasmon coupler based on super surface largely shows as arrowband, and how broadened bandwidth is still currently to need badly
The problem of solution.
The content of the invention
, can the embodiments of the invention provide the artificial surface phasmon coupler based on the super surface of transmission-type phase gradient
To solve problems of the prior art.
Artificial surface phasmon coupler based on the super surface of transmission-type phase gradient, including the super surface of phase gradient and
Square patch array, the super surface of phase gradient is located at directly over side's patch array, therebetween with gap；Phase ladder
The super surface of degree is made up of super surface texture unit, and each construction unit is made up of three-layer metal structure and two layer medium, wherein on
Lower metal is mutually orthogonal metal-gate structures, and intermediate layer is tilting double-head arrow structure；Square patch array is pasted by metal side
Piece, medium substrate and the part of metal backing three composition.
Preferably, the distance between the super surface of the phase gradient and square patch array are hc=9mm.
Preferably, unit period p=6mm of the cellular construction, two layer medium uses thickness h=3mm F4B medium bases
Plate, its relative dielectric constant εr=2.65, loss tangent tan δ=0.001, metal-gate structures cycle s=2mm and width b
=0.2mm, length l=7.7mm, brachium d=1.2mm and the line width g=0.2mm of double-head arrow structure.
Preferably, constituted using 5 sub- construction units between the hyperelement on the super surface of phase gradient, adjacent minor structure unit
Phase difference is 72 °, and the intermediate layer double-head arrow battle array structural parameters of 5 sub- construction units of selection are respectively：Minor structure unit 1：L=
7.7mm, d=1.2mm, g=0.2mm；Minor structure unit 2：L=7.7mm, d=2.6mm, g=0.2mm；Minor structure unit 3：l
=7.5mm, d=3.55mm, g=0.15mm；Minor structure unit 4：L=7.6mm, d=2.3mm, g=0.2mm；Minor structure unit
5：L=7.8mm, d=3.0mm, g=0.2mm.
Preferably, side's patch array structural parameters are：Period p=6mm, patch length a=5mm, the F4B of use is situated between
The thickness of matter substrate is h2=2mm, permittivity εr=2.65.
Compared with prior art, the present invention has advantages below：
1. the present invention super surface of transmission-type phase gradient by the super surface construction of construction unit parameter gradual change, obtains width
Band, efficient excited state surface wave, by the way that the surface wave of excited state is coupled as into broadband by square patch array, efficient intrinsic
Artificial surface of state etc. is from swashing, with being more widely applied prospect.
The 2 super surfaces of line polar curve polarized rotation phase gradient do not show translational symmetry, so propagating wave coupling is people
After work surface phasmon, it will not decouple.Especially, after the artificial surface phasmon decoupling of generation is returned, it will obtain
Extra " artificial wave vector " ζ by the offer of phase gradient super surface, further increase the wave vector parallel to surface, i.e. k//
=ζ+kspp>>K0, so that surface wave becomes more suddenly to die.
3. the artificial surface phasmon produced flows not on super surface, so, significantly reduce due to phase ladder
The Bragg diffraction phenomenon that the cycle " hyperelement " on the super surface of degree produces, is asked incidence wave beam angle sensitivity so as to solve
Topic.
4. the present invention is simple in construction, easily prepared.The super surface of phase gradient used in the present invention and square patch array
All it is the highly developed inexpensive process technology of present preparation technology, i.e. printed-board technology.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the artificial surface phasmon coupler schematic diagram based on the super surface of transmission-type phase gradient；
Fig. 2 is the super surface texture schematic diagram of linear polarization rotatable phase gradient, wherein：(a) it is that the rotation of transmission-type linear polarization is super
Surface cell three-dimensional structure view, (b) is super surface cell intermediate layer double-head arrow structure front view, and (c) is the phase ladder of design
The hyperelement structure intermediate layer double-head arrow array structure front view on the super surface of degree；
Fig. 3 is simulation curve corresponding with structure in Fig. 1, wherein：(a) be 5 construction units in hyperelement structure friendship
Fork polarization transmissivity simulation result, (b) is the cross polarization phase simulation result of 5 construction units in hyperelement structure；
Fig. 4 is that, in y polarized wave vertical incidence, the excited state surface wave that the super surface of linear polarization rotatable phase gradient is produced exists
Electric field component E at different frequent points, in xoz planeszDistribution map, wherein (a) f=7GHz, (b) f=8GHz, (c) f=
9GHz, (d) f=10GHz；
Fig. 5 sides of being chip unit tomograph；
The dispersion profile figure of intrinsic artificial surface phasmon in Fig. 6 sides of being patch array；
Fig. 7 be in y polarized wave vertical incidence, at 8.5GHz, the same polarization mirror of artificial surface phasmon coupler
Face reflectivity simulation result；
Fig. 8 be in y polarized wave vertical incidence, at 8.5GHz, the near field characteristic of artificial surface phasmon coupler
Simulation result, wherein：(a) it is electric field component E in xoz planeszDistribution map, (b) is xoz plane inner field components HyDistribution map,
(c) the energy flow distribution figure in xoz planes；
Fig. 9 is the specular reflectivity of artificial surface phasmon coupler；
Figure 10 is near-field test experimental provision structure chart；
Figure 11 is that, in y polarized wave vertical incidence, eigenstate artificial surface phasmon is put down at different frequent points, in xoz
Electric field component E in facezDistribution map, wherein：(c) f=7GHz, (d) f=8GHz, (e) f=9GHz, (f) f=9.9GHz.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Artificial surface based on the super surface of transmission-type phase gradient provided in reference picture 1, the embodiment of the present invention etc. is from sharp
First coupler, the coupler includes the super surface of phase gradient (1) and square patch array (2), the super surface of phase gradient (1)
Directly over side's patch array (2), therebetween with a certain distance, by optimization, therebetween it is optimal away from
From being hc=9mm.
As shown in Fig. 2 the super surface of phase gradient is made up of super surface texture unit, each construction unit is by three-layer metal knot
Structure and two layer medium composition, wherein upper/lower layer metallic are mutually orthogonal metal-gate structures, and intermediate layer is tilting double-head arrow knot
Shown in structure, such as Fig. 2 (b).By optimization design, ultra-wide band, efficient transmission-type linear polarization can be obtained and rotate super surface, its list
Meta structure parameter is respectively unit period p=6mm；Two layer medium uses thickness h=3mm F4B medium substrates, and it is with respect to dielectric
Constant εr=2.65, loss tangent tan δ=0.001, metal-gate structures cycle s=2mm and width b=0.2mm；Double arrows
Length l=7.7mm, brachium d=1.2mm and the line width g=0.2mm of header structure.When y polarized waves are from+z directions vertical incidence,
Due to class " Fabry-Perot " resonance, y polarized waves can efficiently be converted into x polarization transmitted waves.
The present invention builds the super surface of phase gradient by the method for super surface texture cell parameters gradual change, i.e., need to only change double
Length l, brachium d and the line width g of arrow, realize the regulation and control of equivalent refractive index, then by by these double-head arrow structures according to certain
The mode of kind is arranged, and forms the gradient of equivalent refractive index in a certain direction, and then realize the gradient tune to electromagnetic wave phase
Control.In an example of the present invention, the hyperelement on the super surface of phase gradient, adjacent structure list are constituted using 5 sub- construction units
Phase difference between member constitutes 2 π phase cyclings for the sub- construction unit of 72 °, i.e., 5.Pass through optimization design, 5 son knots of selection
Shown in intermediate layer double-head arrow battle array structure front view such as Fig. 2 (c) of structure unit, corresponding three key structural parameters are respectively：L=
7.7mm, d=1.2mm, g=0.2mm (minor structure unit 1)；L=7.7mm, d=2.6mm, g=0.2mm (minor structure unit 2)；
L=7.5mm, d=3.55mm, g=0.15mm (minor structure unit 3)；L=7.6mm, d=2.3mm, g=0.2mm (minor structure list
Member is 4)；L=7.8mm, d=3.0mm, g=0.2mm (minor structure unit 5)；The other structures parameter of 5 sub- construction units with it is upper
Face is identical.
Fig. 3 (a) and (b) give the cross polarization transmissivity and phase distribution of 5 sub- construction units in hyperelement structure
Simulation result.It can be seen that in 5.8GHz-11.6GHz wide frequency ranges, the cross-pole of 5 sub- construction units
Change transmissivity more than -1dB, adjacent construction unit phase difference is approximately equal to 72 °.Therefore, in the x direction, design
Phase gradient can be calculated according to the π of formula ζ=2/(5*p)=π/15 and obtained.As ζ ＞ k0When, the line polarization wave of vertical incidence will be by
Efficiently it is coupled as surface wave, and the wave vector k of surface wavesw=ζ.
For the super surface of phase gradient designed in Fig. 2, simulation calculation y polarized waves from+z directions vertical incidence when electric field point
Cloth.Fig. 4 sets forth in f=7GHz, 8GHz, 9GHz, 10GHz, the excited state surface wave that the super surface of phase gradient is produced
Electric field component E in xoz planesz.As can be seen that in 7GHz-10GHz wide frequency ranges, cross polarization transmitted wave is high
The coupling of effect ground turns into the surface wave that x polarizes, and surface wave there occurs serious scattering before eigenstate is coupled into.
The present invention is by the super lower face placement side patch array of transmission-type phase gradient so that the sheet of square patch array
Levy wave vector and be approximately equal to " artificial wave vector " that the super surface of phase gradient is provided, so that the surface wave that the super surface of phase gradient is produced
In the intrinsic side's of being coupled to patch array, the artificial surface phasmon of eigenstate is formed.Fig. 5,6 side's of giving patch arrays are three-dimensional
The dispersion profile figure of structure chart and intrinsic artificial surface phasmon.Square patch array is by metal side's paster, medium substrate and gold
Belong to the part of backboard three composition.By optimization design, square patch array structural parameters are：Period p=6mm, patch length a=5mm,
The thickness of the F4B medium substrates used is h2=2mm, permittivity εr=2.65.The color of its intrinsic artificial surface phasmon
The simulation result of non-dramatic song line is as shown in fig. 6, it can be seen that in y polarized wave vertical incidence, in 7GHz-10GHz widebands
In the range of rate, the intrinsic wave vector k of square pastersppIt is approximately equal to the wave vector k for the surface wave that the super surface of phase gradient is producedsw。
From figure 7 it can be seen that during y polarized wave vertical incidence, in 7GHz-10GHz broad frequency ranges, same polarization minute surface is anti-
Rate emulation and test result are penetrated below -10dB.From near field simulation result of Fig. 8 (a)-(c) couplers at f=8.5GHz
As can be seen that in the intrinsic side's of the being coupled to patch array of the surface wave of the super surface generation of phase gradient.From Fig. 9-11 near-field tests
As a result show, in 7GHz-10GHz broad frequency ranges, the surface wave that the super surface of phase gradient is produced is efficient by square paster
It has been coupled into the artificial surface phasmon of eigenstate.
, but those skilled in the art once know basic creation although preferred embodiments of the present invention have been described
Property concept, then can make other change and modification to these embodiments.So, appended claims are intended to be construed to include excellent
Select embodiment and fall into having altered and changing for the scope of the invention.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (5)
1. a kind of artificial surface phasmon coupler based on the super surface of transmission-type phase gradient, it is characterised in that including phase
The super surface of potential gradient and square patch array, the super surface of phase gradient are located at directly over side's patch array, therebetween
With gap；The super surface of phase gradient is made up of super surface texture unit, and each construction unit is by three-layer metal structure and two layers
Medium is constituted, and wherein upper/lower layer metallic is mutually orthogonal metal-gate structures, and intermediate layer is tilting double-head arrow structure；Square paster
Array is made up of metal side's paster, medium substrate and the part of metal backing three.
2. coupler as claimed in claim 1, it is characterised in that between the super surface of phase gradient and square patch array
Distance is hc=9mm.
3. coupler as claimed in claim 1, it is characterised in that unit period p=6mm of the cellular construction, two layers of Jie
Matter uses thickness h=3mm F4B medium substrates, its relative dielectric constant εr=2.65, loss tangent tan δ=0.001,
Metal-gate structures cycle s=2mm and width b=0.2mm, length l=7.7mm, brachium d=1.2mm and the line of double-head arrow structure
Wide g=0.2mm.
4. coupler as claimed in claim 3, it is characterised in that constitute the super surface of phase gradient using 5 sub- construction units
Hyperelement, the phase difference between adjacent minor structure unit is 72 °, the intermediate layer double-head arrow battle array knot of 5 sub- construction units of selection
Structure parameter is respectively：Minor structure unit 1：L=7.7mm, d=1.2mm, g=0.2mm；Minor structure unit 2：L=7.7mm, d=
2.6mm, g=0.2mm；Minor structure unit 3：L=7.5mm, d=3.55mm, g=0.15mm；Minor structure unit 4：L=7.6mm,
D=2.3mm, g=0.2mm；Minor structure unit 5：L=7.8mm, d=3.0mm, g=0.2mm.
5. coupler as claimed in claim 1, it is characterised in that side's patch array structural parameters are：Period p=6mm,
Patch length a=5mm, the thickness of the F4B medium substrates used is h2=2mm, permittivity εr=2.65.
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Cited By (8)
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| CN108879103A (en) * | 2018-06-28 | 2018-11-23 | 中国人民解放军空军工程大学 | Compact feeding network type artificial surface phasmon panel antenna array |
| CN109088170A (en) * | 2018-06-05 | 2018-12-25 | 中国人民解放军空军工程大学 | Super surface spin, wavefront controller and its design method based on principle of interference |
| CN111638569A (en) * | 2020-07-17 | 2020-09-08 | 中国人民解放军空军工程大学 | Radio frequency inductive coupling plasma superposition phase gradient super-surface wave-absorbing structure |
| CN112886273A (en) * | 2021-01-18 | 2021-06-01 | 中国船舶重工集团公司第七二四研究所 | Terahertz plane transmission array polarization torsion unit |
| CN113067159A (en) * | 2021-03-23 | 2021-07-02 | 北京大学 | High-efficiency infinite channel traveling wave-surface wave antenna and implementation method thereof |
| CN113113777A (en) * | 2021-04-13 | 2021-07-13 | 中国人民解放军空军工程大学 | Broadband artificial surface plasmon coupler based on double-geometric phase gradient combination |
| CN113866229A (en) * | 2021-09-23 | 2021-12-31 | 北京大学 | high-Q-value eccentric artificial local surface plasmon quasi-BIC super surface and implementation method thereof |
| CN114442206A (en) * | 2022-01-15 | 2022-05-06 | 复旦大学 | Near-field surface wave high-efficiency far-field directional radiation coupler based on super surface |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109088170A (en) * | 2018-06-05 | 2018-12-25 | 中国人民解放军空军工程大学 | Super surface spin, wavefront controller and its design method based on principle of interference |
| CN109088170B (en) * | 2018-06-05 | 2020-06-02 | 中国人民解放军空军工程大学 | Super-surface spinning and wave-front controller based on interference principle and design method thereof |
| CN108879103A (en) * | 2018-06-28 | 2018-11-23 | 中国人民解放军空军工程大学 | Compact feeding network type artificial surface phasmon panel antenna array |
| CN111638569B (en) * | 2020-07-17 | 2022-04-22 | 中国人民解放军空军工程大学 | Radio frequency inductive coupling plasma superposition phase gradient super-surface wave-absorbing structure |
| CN111638569A (en) * | 2020-07-17 | 2020-09-08 | 中国人民解放军空军工程大学 | Radio frequency inductive coupling plasma superposition phase gradient super-surface wave-absorbing structure |
| CN112886273A (en) * | 2021-01-18 | 2021-06-01 | 中国船舶重工集团公司第七二四研究所 | Terahertz plane transmission array polarization torsion unit |
| CN112886273B (en) * | 2021-01-18 | 2024-01-30 | 中国船舶集团有限公司第七二四研究所 | Terahertz plane transmission array polarization torsion unit |
| CN113067159A (en) * | 2021-03-23 | 2021-07-02 | 北京大学 | High-efficiency infinite channel traveling wave-surface wave antenna and implementation method thereof |
| CN113067159B (en) * | 2021-03-23 | 2022-01-28 | 北京大学 | High-efficiency infinite channel traveling wave-surface wave antenna and implementation method thereof |
| CN113113777A (en) * | 2021-04-13 | 2021-07-13 | 中国人民解放军空军工程大学 | Broadband artificial surface plasmon coupler based on double-geometric phase gradient combination |
| CN113113777B (en) * | 2021-04-13 | 2023-01-17 | 中国人民解放军空军工程大学 | Broadband artificial surface plasmon coupler based on double-geometric phase gradient combination |
| CN113866229A (en) * | 2021-09-23 | 2021-12-31 | 北京大学 | high-Q-value eccentric artificial local surface plasmon quasi-BIC super surface and implementation method thereof |
| CN113866229B (en) * | 2021-09-23 | 2022-07-26 | 北京大学 | high-Q-value eccentric artificial local surface plasmon quasi-BIC super surface and implementation method thereof |
| CN114442206A (en) * | 2022-01-15 | 2022-05-06 | 复旦大学 | Near-field surface wave high-efficiency far-field directional radiation coupler based on super surface |
| CN114442206B (en) * | 2022-01-15 | 2023-09-01 | 复旦大学 | Near-field surface wave high-efficiency far-field directional radiation coupler based on super surface |
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Application publication date: 20171020 |
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| RJ01 | Rejection of invention patent application after publication |