CN106129543A - A kind of difunctional polarization converter based on Graphene DC contact - Google Patents

A kind of difunctional polarization converter based on Graphene DC contact Download PDF

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Publication number
CN106129543A
CN106129543A CN201610682339.3A CN201610682339A CN106129543A CN 106129543 A CN106129543 A CN 106129543A CN 201610682339 A CN201610682339 A CN 201610682339A CN 106129543 A CN106129543 A CN 106129543A
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China
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graphene
arm
polarization converter
contact
difunctional
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CN201610682339.3A
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Inventor
高喜
杨万里
余行阳
曹卫平
李海鸥
于兴华
姜彦南
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Guilin University of Electronic Technology
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Guilin University of Electronic Technology
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Priority to CN201610682339.3A priority Critical patent/CN106129543A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/165—Auxiliary devices for rotating the plane of polarisation
    • 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
    • H01Q15/24—Polarising devices; Polarisation filters 

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Abstract

The present invention is a kind of difunctional polarization converter based on Graphene DC contact, substrate includes metal back layer, silicon middle level and silica surface, artificial structure is the cellular construction lining up array on substrate top layer, described cellular construction is mutually orthogonal, " work " type Graphene arm of center superposition and metal arm, and Graphene arm is pressed in below metal arm.Longitudinal Graphene arm is connected with each other, and has gap, the center of cellular construction array to be on base center line, be vertically and horizontally 10～200 cellular constructions between horizontal metal arm, and quantity is equal." work " type Graphene arm is all symmetrical with longitudinal centre line, symmetrical above and below with cross central line with metal arm.The present invention does not change structural parameters, changes bias voltage VgLinear polarization and the switching of circular polarisation two kinds of functions of conversion can be realized；Graphene arm joins end to end and forms DC contact, the beneficially overall-in-one control schema of Graphene bias；Simple in construction, it is easy to processing；Conversion efficiency is up to 99%.

Description

A kind of difunctional polarization converter based on Graphene DC contact
Technical field
The present invention relates to Films In Passive Microwave Devices and Meta Materials field, be specifically related to a kind of double merits based on Graphene DC contact Can polarization converter.
Background technology
Polarization of electromagnetic wave direction refers to electromagnetic wave instantaneous orientation of its electric field intensity when spatial transmission.At various antennas System, also in microwave and optical instrumentation, it is often necessary to the conversion between different polarized states, to obtain certain one pole Change ripple or dual polarization ripple.The index that polarization converter requires is mainly that performance is high, it is low to be lost, size is little, low cost and design letter Single several respects.
Along with developing rapidly of artificial Meta Materials technology, its application in electromagnetic wave propagation is increasing.Also occur in that Multiple polarization converter based on artificial Meta Materials, its principle is real by the metal structure unit different in dielectric surface design Now amplitude and the regulation and control of phase place to electromagnetic wave.The polarization converter simple in construction of Meta Materials, low cost of manufacture, size is little, turns Change efficiency high, it is simple to control and design, therefore being favored, in recent years the artificial super material of application in terms of polarization of electromagnetic wave conversion Being designed with of material significantly increases.Chinese patent application 201110061752 " a kind of Meta Materials polarization conversion as disclosed in 2012 Device ", Chinese patent application 201310332273 " realizing Meta Materials and the polarizer of polarization conversion " disclosed in 2015.
But existing polarization converter the most only has single polarization conversion function, such as single function cross polarization conversion Device or circular polarisation transducer.The polarization converter based on grapheme material occurred recently, to a certain degree improves the problems referred to above, But there is also some shortcomings, such as structure is complicated, is difficult to realize.
Summary of the invention
It is an object of the invention to design a kind of difunctional polarization converter based on Graphene DC contact, metal back layer, It is the cellular construction of " work " type Graphene arm and " work " type metal arm composition on silicon middle level and silica surface substrate, identical Cellular construction lines up array.The Graphene arm of longitudinal neighboring unit structure is connected with each other, the gold of horizontal neighboring unit structure Belong to and have gap between arm.Because forming DC contact between longitudinal Graphene arm, i.e. the most controlled at this programme polarizer two ends making alive Making the bias of Graphene arm on whole polarization device, therefore the polarizer of the present invention is without changing device structural parameters, by changing Become and on Graphene, bias the switching i.e. realized between linear polarization conversion and circular polarisation conversion.
A kind of based on Graphene DC contact the difunctional polarization converter of present invention design, including substrate with at substrate table The artificial structure in face, described substrate includes metal back layer, silicon middle level and silica surface, and described artificial structure is at substrate table Lining up the cellular construction of array on layer, cellular construction of the present invention is mutually orthogonal, " work " type Graphene arm of center superposition With " work " type metal arm, the Graphene arm of longitudinal neighboring unit structure is connected with each other, the metal of horizontal neighboring unit structure There is gap between arm, and the center of cellular construction array is on base center line, be longitudinally 10～200 cellular constructions, horizontal To for 10～200 cellular constructions.
The overlapping that in described cellular construction, Graphene arm is orthogonal with metal arm, Graphene arm is crushed on below metal arm.
Described " work " type Graphene arm and " work " type metal arm are all symmetrical, with the horizontal stroke of arm with the longitudinal centre line of arm It is symmetrical above and below to centrage.
The cellular construction quantity of described polarization converter vertical and horizontal is equal.
The thickness of described Graphene arm is 0.34nm～1nm, and the thickness of described metal arm is 150nm～250nm.
The dielectric constant of described Graphene arm is 3.9 ± 0.4, and the dielectric constant of described metal arm is 11.9 ± 0.4.
Described silica surface, silicon middle level and metal back layer area equation, adjacent two-layer mutually attaches, and constitutes one The polarization converter of reflection-type, improves the efficiency of polarization conversion significantly.
The silicon dioxide meter layer thickness of described substrate is 100nm～300nm；Described silicon intima-media thickness be 300nm～ 3000nm；Described metal back layer thickness is 150nm～250nm.
Described metal back layer and metal arm are native gold.
In the polarization converter of present invention design, Graphene is regarded electrical conductivity surface as, its conductivityσsBy Kubo formula Obtain, by band internal conductance rate σinterWith interband conductivityσintraConstitute:
σS=σintra(ω,uC,Γ,T)+σinter(ω,uC,Γ,T)
σ int r a ( ω , u C , Γ , T ) = - j e 2 k S T π h ( ω - j 2 Γ ) ( u C k S + 2 l n ( e - u C k S T + 1 ) )
σ int e r ( ω , u C , Γ , T ) = - j e 2 4 π h l n ( 2 | u C | - ( ω - j 2 Γ ) h 2 | u C | + ( ω - j 2 Γ ) h
Wherein, h, kBBeing Planck's constant respectively, Boltzmann's constant, e is the unit charge amount on Graphene (1.60217733 × 10^-19C), T is room temperature 300K.uc(EF) it is Graphene fermi level, ω is incoming electromagnetic angular frequency. Γ is scattered power, whereinτ is the electron relaxation time.
Graphene electrical conductivity imaginary part is perception, regards as connecting of resistance and inductance.Between the metal arm of neighboring unit structure There is gap so that cellular construction is capacitive in metal arm direction.Because Graphene electrical conductivity imaginary part is perception, cellular construction is at stone Ink alkene arm direction is perception.
Due to the anisotropy of material, on two orthogonal directions of Graphene arm and metal arm, the refractive index of equivalence is not With.When incidence wave electric field is polarised direction " work " word structure orthogonal with two line polarization wave at 45 °, the equivalence of incidence wave electric field It is decomposed into the electric field component that the Graphene arm direction amplitude equal phase orthogonal with the two of metal arm direction is identical, through material After reflection, the phase place of the electric field component in metal arm direction is advanced, the delayed phase of Graphene arm direction electric field component, pairwise orthogonal field Component phase differs 90 ° or 180 °, forms circularly polarised wave or line polarization wave.
Change Graphene arm bias voltage VgAnd then change its chemical potential (i.e. fermi level) EFAnd electrical conductivity imaginary part is big Little, i.e. change Graphene inductance size.
Due to the change on the gap not recurring structure of metal arm and adjacent metal arm, so the electric capacity on metal arm direction Constant.
E when Graphene armFDuring=1eV, the electric field phase difference on two orthogonal directions is 90 °, and this polarization converter is real Existing linear polarization is to the conversion of circular polarisation；Chemical potential E when Graphene armFDuring=0eV, the electric field phase on two orthogonal directions is poor Being 180 °, this polarization converter realizes the linear polarization conversion to circular polarisation.I.e. this polarization converter is by changing bias voltage Vg, Adjust the size of graphenic surface perception so that it is chemical potential changes between 0eV and 1eV, it is achieved that this device turns from linear polarization Switching between parallel operation and circular polarisation transducer.
Compared with prior art, a kind of difunctional polarization converter based on Graphene DC contact of the present invention has following spy Property: 1, this polarization converter structure is fixed, and does not the most change structural parameters, by changing bias voltage Vg, it is possible to realize line pole Change conversion and the switching of circular polarisation two kinds of functions of conversion；2, in array structure, Graphene arm joins end to end and forms DC contact, compares In other artificial structures based on Graphene, more easily realize whole polarization converter each unit structure graphite alkene bias Overall-in-one control schema；3, basic structure is simple, it is easy to processing；4, linear polarization conversion and entelechy are realized at the widest frequency band range Change conversion function switching, it can be seen that the conversion efficiency of linear polarization is up to 99% in experiment, 0.178～0.283THz it Between frequency band range wide for 105GHz in the conversion efficiency of linear polarization more than 80%；Circular polarisation conversion efficiency reaches 49%, 0.208 ～in the frequency band range wide for 90GHz between 0.298THz, all can realize the axial ratio bandwidth less than 3dB.
Accompanying drawing explanation
Fig. 1 is the perspective view of this difunctional polarization converter embodiment based on Graphene DC contact；
Fig. 2 is the top view of this difunctional polarization converter embodiment based on Graphene DC contact；
Fig. 3 is a cellular construction schematic diagram in Fig. 2；
Fig. 4 is the artificial line polarization conversion ratio PCR of this difunctional polarization converter embodiment based on Graphene DC contact Figure；
Fig. 5 is the emulation Circular polarization ratio figure of this difunctional polarization converter embodiment based on Graphene DC contact.
Figure is numbered:
1, artificial structure, 11, metal arm, 12, Graphene arm, 2, silica surface, 3, silicon middle level, 4, metal back layer.
Detailed description of the invention
This difunctional polarization converter embodiment based on Graphene DC contact is as it is shown in figure 1, include substrate and in substrate The artificial structure 1 on surface, described substrate includes metal back layer 4, silicon middle level 3 and silica surface 2.As in figure 2 it is shown, described people Work structure 1 is the cellular construction investing and lining up array on the silica surface 2 of substrate, this example cellular construction be mutually orthogonal, " work " type Graphene arm 11 and " work " type metal arm 11 of center superposition, the Graphene arm 12 of longitudinal neighboring unit structure is mutual Connect, between the metal arm 11 of horizontal neighboring unit structure, have gap.The center of cellular construction array is in base center line On.This example polarization converter is longitudinally, laterally 200 cellular constructions.
The overlapping that in this example cellular construction, Graphene arm 12 is orthogonal with metal arm 11, Graphene arm 12 is crushed on metal arm Below 11.
This example " work " type Graphene arm 12 is all symmetrical, with arm with the longitudinal centre line of arm with " work " type metal arm 11 Cross central line be symmetrical above and below.
The thickness of this example Graphene arm 12 is 0.6nm, and dielectric constant is 3.9 ± 0.1；Metal arm 11 is thickness 200nm, Jie Electric constant is the native gold of 11.9 ± 0.1.
This example silica surface 2, silicon middle level 3 and metal back layer 4 area equation, adjacent two-layer mutually attaches.
Silica surface 2 thickness of this example substrate is 200nm；Silicon middle level 3 thickness is 2000nm；Metal back layer 4 is thick The native gold of degree 200nm.
As it is shown on figure 3, one cellular construction of this example is square, length of side P=120 μm；Length L1=in the middle part of metal arm 11 100 μm, middle part width W1=20 μm, the width WX1=8 μm of metal arm 11 two ends " work " word, WY1=30 μm of growing crosswise, adjacent list Gap width r=4 μm between the metal arm 11 of meta structure；Length L2=88 μm in the middle part of Graphene arm 12, middle part width W2=8 μm, the width WY2=16 μm of Graphene arm 12 two ends " work " word, WX2=30 μm of growing crosswise.
Above-mentioned polarization converter embodiment carries out emulation experiment, and it works in Terahertz frequency range, when polarization converter two ends Making alive, controls the bias V of Graphene arm 11gIt is 0, chemical potential E of Graphene armF=0eV, the electric field on two orthogonal directions Phase contrast is 180 °, and now polarization converter can realize the circularly polarised wave conversion to line polarization wave, and in Fig. 4, abscissa is incidence wave Frequency, unit is THz, and vertical coordinate is the PCR conversion ratio (cross polarization conversion ratio) of line polarization wave, and thus Fig. 4 is visible, incidence wave In the frequency band range that frequency 105GHz between 0.178～0.283THz is wide, the conversion efficiency of linear polarization is all higher than 80%；? Height can reach 99%.49% is reached according to this example experiment circular polarisation conversion efficiency that square is calculated of circular polarisation component amplitude.
Control the bias V of Graphene arm 11gFor 86V, chemical potential E of Graphene armF=1eV, the electricity on two orthogonal directions Field phase difference is 90 °, and incidence wave electric field is the line polarization wave that polarised direction " work " word structure orthogonal with two is at 45 °, this pole Change transducer and realize the linear polarization conversion to circular polarisation；In Fig. 5, abscissa is incidence wave frequency, and unit is THz；Vertical coordinate is circle The axial ratio bandwidth of polarized wave, unit is dB.Thus Fig. 5 is visible, incidence wave frequency 90GHz between 0.208～0.298THz In wide frequency band range, axial ratio bandwidth is respectively less than 3dB.
The polarization converter of present invention design seen from the present embodiment can be in the widest frequency range and to line polarization wave to circle Polarized wave, or circularly polarised wave is to the conversion of line polarization wave, and there is good circular polarisation degree and the conversion of linear polarization PCR Rate.
Above-described embodiment, only further describe the purpose of the present invention, technical scheme and beneficial effect is concrete Individual example, the present invention is not limited to this.All made within the scope of disclosure of the invention any amendment, equivalent, change Enter, within being all contained in protection scope of the present invention.

Claims (9)

1. a difunctional polarization converter based on Graphene DC contact, including substrate with the artificial structure of substrate surface (1), described substrate includes metal back layer (4), silicon middle level (3) and silica surface (2), and described artificial structure (1) is at base The cellular construction of array is lined up on top layer, the end, it is characterised in that:
Described cellular construction is mutually orthogonal, " work " type Graphene arm (12) and " work " type metal arm (11) of center superposition, vertical To the Graphene arm (12) of neighboring unit structure be connected with each other, between having between the metal arm (11) of horizontal neighboring unit structure Gap；The center of cellular construction array is on base center line, is longitudinally 10～200 cellular constructions, is laterally 10～200 Cellular construction.
Difunctional polarization converter based on Graphene DC contact the most according to claim 1, it is characterised in that:
The overlapping that in described cellular construction, Graphene arm (12) is orthogonal with metal arm (11), Graphene arm (12) is crushed on metal Arm (11) lower section.
Difunctional polarization converter based on Graphene DC contact the most according to claim 1, it is characterised in that:
Described " work " type Graphene arm (12) and " work " type metal arm (11) are all symmetrical, with arm with the longitudinal centre line of arm Cross central line be symmetrical above and below.
Difunctional polarization converter based on Graphene DC contact the most according to claim 1, it is characterised in that:
The cellular construction quantity of described polarization converter vertical and horizontal is equal.
Difunctional polarization converter based on Graphene DC contact the most according to claim 1, it is characterised in that:
The thickness of described Graphene arm (12) is 0.34nm～1nm, and the thickness of described metal arm (11) is 150nm～250nm.
Difunctional polarization converter based on Graphene DC contact the most according to claim 1, it is characterised in that:
The dielectric constant of described Graphene arm (12) is 3.9 ± 0.4, and the dielectric constant of described metal arm (11) is 11.9 ± 0.4.
Difunctional polarization converter based on Graphene DC contact the most according to claim 1, it is characterised in that:
Described silica surface (2), silicon middle level (3) and metal back layer (4) area equation, adjacent two-layer mutually attaches.
Difunctional polarization converter based on Graphene DC contact the most according to claim 7, it is characterised in that:
Silica surface (2) thickness of described substrate is 100nm～300nm；Described silicon middle level (3) thickness be 300nm～ 3000nm；Described metal back layer (4) thickness is 150nm～250nm.
Difunctional polarization converter based on Graphene DC contact the most according to claim 1, it is characterised in that:
Described metal back layer (4) and metal arm (11) are native gold.
CN201610682339.3A 2016-08-17 2016-08-17 A kind of difunctional polarization converter based on Graphene DC contact Pending CN106129543A (en)

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Cited By (7)

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Publication number Priority date Publication date Assignee Title
CN106547121A (en) * 2017-01-19 2017-03-29 中南林业科技大学 A kind of light polarization transducer based on Graphene
CN107240781A (en) * 2017-07-14 2017-10-10 桂林电子科技大学 A kind of broadband circle polarized converter of the frequency-tunable based on graphene
CN107819202A (en) * 2017-09-30 2018-03-20 北京邮电大学 Beam scanning reflecting antenna array and beam sweeping method based on graphene
CN108110433A (en) * 2017-11-22 2018-06-01 桂林电子科技大学 Surpass the multi-functional THz polarization converters on surface based on graphene-metal mixed
CN109449602A (en) * 2018-11-12 2019-03-08 电子科技大学 A kind of frequency reconfigurable absorbing material based on graphene
CN109921195A (en) * 2019-03-19 2019-06-21 西安交通大学 A kind of adjustable line of dynamic-circular polarisation converter
CN111129783A (en) * 2020-01-10 2020-05-08 山西大学 Function-reconfigurable metamaterial broadband polarization converter/absorber

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106547121A (en) * 2017-01-19 2017-03-29 中南林业科技大学 A kind of light polarization transducer based on Graphene
CN106547121B (en) * 2017-01-19 2019-05-17 中南林业科技大学 A kind of light polarization converter based on graphene
CN107240781A (en) * 2017-07-14 2017-10-10 桂林电子科技大学 A kind of broadband circle polarized converter of the frequency-tunable based on graphene
CN107819202A (en) * 2017-09-30 2018-03-20 北京邮电大学 Beam scanning reflecting antenna array and beam sweeping method based on graphene
CN108110433A (en) * 2017-11-22 2018-06-01 桂林电子科技大学 Surpass the multi-functional THz polarization converters on surface based on graphene-metal mixed
CN108110433B (en) * 2017-11-22 2024-04-12 桂林电子科技大学 Multifunctional THz polarization converter based on graphene-metal mixed super surface
CN109449602A (en) * 2018-11-12 2019-03-08 电子科技大学 A kind of frequency reconfigurable absorbing material based on graphene
CN109921195A (en) * 2019-03-19 2019-06-21 西安交通大学 A kind of adjustable line of dynamic-circular polarisation converter
CN109921195B (en) * 2019-03-19 2020-03-17 西安交通大学 Dynamically adjustable linear-circular polarization converter
CN111129783A (en) * 2020-01-10 2020-05-08 山西大学 Function-reconfigurable metamaterial broadband polarization converter/absorber
CN111129783B (en) * 2020-01-10 2020-12-25 山西大学 Function-reconfigurable metamaterial broadband polarization converter/absorber

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Application publication date: 20161116