CN207021384U - A kind of broadband circle polarized converter of the frequency-tunable based on graphene - Google Patents
A kind of broadband circle polarized converter of the frequency-tunable based on graphene Download PDFInfo
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- CN207021384U CN207021384U CN201720855816.1U CN201720855816U CN207021384U CN 207021384 U CN207021384 U CN 207021384U CN 201720855816 U CN201720855816 U CN 201720855816U CN 207021384 U CN207021384 U CN 207021384U
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Abstract
The utility model discloses a kind of broadband circle polarized converter of the frequency-tunable based on graphene, by medium substrate layer, is arranged on the super superficial layer of graphene of medium substrate layer upper surface and is arranged on the graphene floor layer of medium substrate layer lower surface and form；The super superficial layer of graphene is the graphene film of individual layer hollow out；Offer multiple butterfly-shaped hole arranged in arrays on the layer graphene piece, each butterfly-shaped hole is relative or be stacked and set formed zhou duicheng tuxing by drift angle by 2 isosceles triangle holes of the same size；The graphene film stacking that graphene floor layer has identical performance parameter by multilayer forms.The utility model can realize conversion of the line polarization wave to circularly polarised wave in very wide frequency band, and there is good circular polarisation performance, the tuning bandwidth based on graphene reflection-type polarizer has largely been expanded, has been solved the problems, such as because interference condition limits tuning bandwidth.
Description
Technical field
It the utility model is related to THz devices and technical field of graphene, and in particular to a kind of frequency based on graphene
Tunable broadband circle polarized converter.
Background technology
Highly important effect is played in polarization of electromagnetic wave in actual applications, and this characteristic is used for THz imagings, THz
Sensing etc..New polarization switching device based on super surface has in light weight, simple in construction, the low advantage of loss and extensively should
With.But the super surface in such device is built by metal material, the polarization conversion device function of thus designing is single, work
Frequency does not possess tunable characteristic, it is necessary to is redesigned by the geometric shapes and parameter of changing super surface, ability
The polarization conversion function and working frequency of enough tuning devices, strongly limit the application of device.It is in addition, existing based on Meta Materials
The floor of reflection-type polarization converter is metal, and it introduces 180 ° of fixed additive phases to reflection electromagnetic wave, works as tuning device
Working frequency when, because metal floor can only provide fixed additive phase, this make it that the interference condition on super surface is destroyed,
So as to influence the service behaviour of device, therefore the tuning bandwidth of device is limited.
Utility model content
To be solved in the utility model is that the working frequency of existing polarization converter does not possess the problem of tunable characteristic,
A kind of broadband circle polarized converter of the frequency-tunable based on graphene is provided, it has the spy of broadband and frequency-tunable
Property.
To solve the above problems, the utility model is achieved through the following technical solutions：
A kind of broadband circle polarized converter of the frequency-tunable based on graphene, including broadband circle polarized converter sheet
Body, the broadband circle polarized converter body by medium substrate layer, be arranged on medium substrate layer upper surface the super superficial layer of graphene,
And it is arranged on the graphene floor layer composition of medium substrate layer lower surface；The super superficial layer of graphene is the graphene of individual layer hollow out
Piece, i.e., offer multiple butterfly-shaped hole arranged in arrays on the layer graphene piece, and each butterfly-shaped hole is in the same size by 2
Isosceles triangle hole it is relative or be stacked formed zhou duicheng tuxing is set by drift angle；Graphene floor layer is had by multilayer
The graphene film of same performance parameter is stacked and formed；Surpass in graphene and apply bias voltage V between superficial layer and medium substrate layer1
And/or apply bias voltage V between graphene floor layer and medium substrate layer2, and by applying different bias voltage V1
And/or bias voltage V2To adjust the fermi level E of the super superficial layer of grapheneF1And/or the fermi level E of graphene floor layerF2,
So as to realize the dynamic-tuning in the broadband of broadband circle polarized converter body and frequency.
In such scheme, each butterfly-shaped hole is both that x-axis is symmetrical on transverse axis, and is that y-axis is symmetrical on the longitudinal axis.
In such scheme, the thickness of every layer graphene piece of the super superficial layer of graphene and graphene floor layer is 0.335nm
~1nm.
In such scheme, the super superficial layer of graphene is attached to the upper surface of medium substrate layer by chemical precipitation method.
In such scheme, graphene floor layer is attached to the lower surface of medium substrate layer by random stacking.
In such scheme, medium substrate layer is silicon chip.
Compared with prior art, the utility model has following advantage：
1st, surface is surpassed based on graphene and realizes that working frequency tunes, and the super surface of graphene uses complementary structure, unit
Between graphenic surface be connected, facilitate the application of bias voltage；
2nd, metal floor is replaced using multi-layer graphene piece, not only there is higher reflex to electromagnetic wave, and can be with
The phase of dynamic tuning reflection electromagnetic wave, it is met the electromagnetic wave interference condition at super surface in broad frequency range, solve
The problem of commonplace components tuning bandwidths is narrow；
3rd, by adjusting the fermi level of graphene, the polarization converter realizes line polarization wave-circle in 0.46-0.9THz
The conversion of polarized wave, Circular polarization ratio is respectively less than 3dB in this frequency range, there is preferable circular polarisation performance.
Brief description of the drawings
Fig. 1 is the dimensional structure diagram of the broadband circle polarized converter of the frequency-tunable based on graphene.
Fig. 2 is the super surface cell amplification knot of graphene of the broadband circle polarized converter of the frequency-tunable based on graphene
Structure schematic diagram.
Fig. 3 is that the graphene of the broadband circle polarized converter of the frequency-tunable based on graphene biases V1And V2Loading side
Formula schematic diagram.
Fig. 4 is as upper layer graphene fermi level EF1=0.4eV, bottom multi-layer graphene fermi level EF2=0.4eV
When, the reflection coefficient chart after u polarised directions electromagnetic wave incident of the present utility model.
Fig. 5 is regulation graphene fermi level EF1, EF2Obtained Circular polarization ratio tuning bandwidth curve map.
Label in figure：The super superficial layer of 1-1, graphene；1-2, medium substrate layer；1-3, graphene floor layer.
Embodiment
For the purpose of this utility model, technical scheme and advantage is more clearly understood, below in conjunction with instantiation, and join
According to accompanying drawing, the utility model is further described.It should be noted that the direction term mentioned in example, such as " on ",
" under ", " in ", " left side " " right side ", "front", "rear" etc., only it is the direction of refer to the attached drawing.Therefore, the direction used is intended merely to illustrate
Not it is used for limiting the scope of protection of the utility model.
A kind of broadband circle polarized converter of the frequency-tunable based on graphene, as shown in figure 1, including broadband circle polarized
Converter body, the broadband circle polarized converter body by medium substrate layer 1-2, be arranged on medium substrate layer 1-2 upper surfaces
The super superficial layer 1-1 of graphene and the graphene floor layer 1-3 compositions for being arranged on medium substrate layer 1-2 lower surfaces.
The super superficial layer 1-1 of graphene is the graphene film of individual layer hollow out, as shown in Fig. 2 being opened on the layer graphene piece
Provided with multiple butterfly-shaped hole arranged in arrays.In the utility model preferred embodiment, butterfly-shaped hole on graphene film along x and
The quantity repeated arrangement such as y directions obtains, and arrangement number is more than 25.Above-mentioned each butterfly-shaped hole is of the same size etc. by 2
Lumbar triangle shape hole, which is oppositely arranged, to be formed.In the utility model preferred embodiment, the long PX of each butterfly-shaped hole is 33um, and wide PY is
35um.The drift angle in this 2 isosceles triangle holes both can be directly relative, and now G distance is 0 in Fig. 2；It can be stacked again, this
When Fig. 2 in G distance be more than 0.In the utility model preferred embodiment, the drift angle in 2 isosceles triangle holes is stacked setting, and
G distance is 2um in Fig. 2.Because each butterfly-shaped hole is that have 2 isosceles triangle holes of the same size to be oppositely arranged to form, because
The transverse axis i.e. x-axis that this each butterfly-shaped hole had both surpassed superficial layer 1-1 surfaces on graphene is symmetrical, and surpasses superficial layer 1- on graphene
The longitudinal axis on 1 surface is that y-axis is symmetrical.In the utility model preferred embodiment, the super superficial layer 1-1 of graphene passes through chemical precipitation method
It is attached to medium substrate layer 1-2 upper surface.
The graphene film stacking that graphene floor layer 1-3 has identical performance parameter by multilayer forms.Due to multilayer heap
Folded graphene has higher electrical conductivity, can produce larger reflection to electromagnetic wave.In the utility model preferred embodiment,
Graphene floor layer 1-3 is attached to medium substrate layer 1-2 lower surface by random stacking.The utility model is different from tradition
Reflection-type polarizer using metal as floor, its reflection floor are the multi-layer graphene structures used.When with multi-layer graphene
Floor replaces metal floor, and 180 ° are no longer secured to by the additive phase of graphene reflection electromagnetic wave, but by the inclined of graphene
Regulating and controlling voltage is put, maximum modification scope is from -79 ° to 119 °.Therefore, even if we change the working frequency of device, due to more
Layer graphene piece is to the phase modulating properties of back wave, and interference condition of the back wave on super surface remains able to meet, so as to big
Amplitude improves the tuning bandwidth of device operating frequencies, and relative bandwidth reaches 64.7%.
In the utility model preferred embodiment, medium substrate layer 1-2 is silicon chip, and its relative dielectric constant is 11.9.Stone
The thickness of the black super superficial layer 1-1 and graphene floor layer 1-3 of alkene every layer graphene piece is 0.335nm~1nm.The utility model
Similar to the structure of Fabry resonator.It is due to that upper layer graphene surpasses that line polarization wave incidence is reflected into circularly polarised wave through polarizer
Surface causes electromagnetism wave amplitude and phase to the resonance and class Fabry resonator of electromagnetic wave to the resonance collective effect of electromagnetic wave
Change, formed circularly polarised wave.
In order to understand the tuning process of the polarization converter in depth, we go to analyze its Physical Mechanism with interference theory.
As line polarization wave u, incident device, because graphene surpasses the anisotropy on surface, surface can produce the intersection of reflection and transmission
Polarization components and co-polarization component.The cross polar component and co-polarization component of transmitted electromagnetic wave enter medium, anti-by floor
Penetrate, arrive again at the super surface of graphene, now the electromagnetic wave of each component can interfere on super surface.Make in electromagnetic wave interference
Under, the final polarized state of outgoing electromagnetic wave depends on the amplitude and phase of co-polarization component and cross polar component.And hand over
The electromagnetic wave of fork polarization components and co-polarization component propagates one and (super table is returned again to from super surface to floor back and forth in media as well
Face) propagation phase that is obtained is as follows：
Wherein, λ0Be transmission electromagnetic wave wavelength, nsiWith the refractive index and thickness of h media, θ is floor reflection electromagnetic wave
Caused additive phase.Work as propagation phaseProperly, then constructive interference condition can be produced on super surface, specifically at this
It is presented as that the polarization of ele state that interference obtains is circular polarisation in utility model.Conversely, it will be produced on super surface broken ring-like
Interference condition, deteriorate device performance.
For the tuning device on the super surface of other graphenes, its floor is metal, then attached caused by floor reflection electromagnetic wave
Phase theta is added to be fixed for 180 °.When electromagnetic wavelength changes, nsi, h and θ are constant, then meet originally under interference conditionIt will be broken, so that such device can not obtain a wider frequency tuning range.But in this reality
It is that can be regulated and controled by changing the fermi level on graphene floor with the additive phase θ as caused by graphene floor in new
's.By adjusting phase theta so that propagation phase at different wavelengthsAll meet interference condition, and then widen device
Tunable bandwidth.
Referring to Fig. 3, surpass in graphene and apply bias voltage V between superficial layer 1-1 and medium substrate layer 1-2 and/or in stone
Apply bias voltage V between black alkene floor layer 1-3 and medium substrate layer 1-22, and by applying different bias voltage V1And/or
Bias voltage V2To change the super superficial layer 1-1 of graphene fermi level EF1And/or graphene floor layer 1-3 fermi level
EF2.Relation refers to below equation between bias voltage and fermi level：
In formulaFor planck constant, vfV is taken for Fermi velocityf=1.1 × 106M/s, n are graphene carrier concentration, tool
Body can be measured by experiment.
By the fermi level E for changing grapheneF1, EF2Size, thus it is possible to vary the electrical conductivity of graphene, realize graphene
The dynamic regulation of electrical conductivity, so as to the working frequency of the tuning device in broad frequency range, and then realize broadband circle polarized
The broadband of converter body and the dynamic-tuning of frequency.Specifically, by adjusting the super superficial layer 1-1 of graphene Fermi's energy
Level EF1, graphene electrical conductivity can be changed, so as to the resonance characteristic on the super surface of layer graphene in dynamic modulation.By adjusting graphite
Alkene floor layer 1-3 fermi level EF2, can effective tuned reflective electromagnetic wave phase characteristic.It is being graphite using upper layer graphene
The super superficial layer 1-1 of alkene fermi level EF1During the working frequency of tuning device, while it is graphene floor using lower layer graphene
Layer 1-3 fermi level EF2Regulate and control the phase of reflection electromagnetic wave, can so allow the super table of layer graphene in broad frequency range
Meet interference condition between the back wave in face and back wave from lower layer graphene, ensure device in broad tuning frequency band range
With preferable polarization conversion characteristic.
Carry out emulation experiment is optimized to designed each parameter of polarization converter, obtains preferred simulation example, is emulated
Choice of software CST2016.One each parameter of cellular construction of this example is as follows：Length of side P=40um, the butterfly-shaped hole double-vane of upper layer graphene
Width PX=33um, the length PY=35um of double-vane, the spacing G=2um among both wings, single-layer graphene thickness is 0.335nm.
Silicon base thickness H=30um, bottom graphene are that single-layer graphene stacks 7 layers of composition multi-layer graphene piece, and every layer of stone at random
The characterisitic parameter of black alkene piece is all identical, specifically includes with identical relaxation time τ=2ps and identical fermi level EF。
In emulation experiment, incidence wave is line polarization wave, and E field polarization direction is in 45 ° with x-axis, is denoted as u polarized waves.Work as upper strata
Graphene fermi level EF1=0.4eV, bottom multi-layer graphene floor fermi level EF2During=0.4eV, back wave intersection is obtained
Polarization componentsWith co polarized component reflectance factorAmplitude and phase difference, as shown in figure 4, in frequency range 0.76-
In 0.9THz, the amplitudes of two components is close to equal, and phase difference is close to 90 °, therefore composite wave is circularly polarised wave, realizes incident ray pole
Change ripple to the effect of reflection circularly polarised wave.As the fermi level E for changing the upper super surface of layer grapheneF1With bottom multi-layer graphene
The fermi level E of plateF2, the Circular polarization ratio Bandwidth Dynamic tuning of polarizer, as shown in figure 5, realizing in 0.46-0.9THz models
Enclose interior Circular polarization ratio and be less than 3dB, reach 64.7% with respect to tuning bandwidth.
In this preferred simulation example, the polarization converter proposed realizes line polarization wave to circularly polarised wave in very wide frequency band
Conversion, and there is good circular polarisation performance, largely expanded the tuning band based on graphene reflection-type polarizer
Width, solve the problems, such as because interference condition limits tuning bandwidth.
It should be noted that although embodiment described in the utility model is illustrative above, but this is not to this
The limitation of utility model, therefore the utility model is not limited in above-mentioned embodiment.The utility model is not being departed from
In the case of principle, other embodiment that every those skilled in the art obtain under enlightenment of the present utility model is accordingly to be regarded as
Within protection of the present utility model.
Claims (6)
1. a kind of broadband circle polarized converter of the frequency-tunable based on graphene, including broadband circle polarized converter body,
It is characterized in that：The broadband circle polarized converter body by medium substrate layer (1-2), be arranged on medium substrate layer (1-2) upper table
The super superficial layer of graphene (1-1) in face and graphene floor layer (1-3) group for being arranged on medium substrate layer (1-2) lower surface
Into；
The super superficial layer of graphene (1-1) is the graphene film of individual layer hollow out, i.e., it is in square to be offered on the layer graphene piece multiple
The butterfly-shaped hole of battle array arrangement, each butterfly-shaped hole are relative or be stacked and set by drift angle by 2 isosceles triangle holes of the same size
Put formed zhou duicheng tuxing；
The graphene film stacking that graphene floor layer (1-3) has same performance parameter by multilayer forms；
Surpass in graphene and apply bias voltage V between superficial layer (1-1) and medium substrate layer (1-2)1And/or on graphene floor
Apply bias voltage V between layer (1-3) and medium substrate layer (1-2)2, and by applying different bias voltage V1And/or biasing
Voltage V2To adjust the fermi level E of the super superficial layer of graphene (1-1)F1And/or the fermi level of graphene floor layer (1-3)
EF2, so as to realize the dynamic-tuning in the broadband of broadband circle polarized converter body and frequency.
2. a kind of broadband circle polarized converter of frequency-tunable based on graphene according to claim 1, its feature
It is：The transverse axis i.e. x-axis that each butterfly-shaped hole had both surpassed superficial layer (1-1) surface on graphene is symmetrical, and surpasses table on graphene
The longitudinal axis on surface layer (1-1) surface is that y-axis is symmetrical.
3. a kind of broadband circle polarized converter of frequency-tunable based on graphene according to claim 1, its feature
It is：The thickness of every layer graphene piece of the super superficial layer of graphene (1-1) and graphene floor layer (1-3) be 0.335nm~
1nm。
4. a kind of broadband circle polarized converter of frequency-tunable based on graphene according to claim 1, its feature
It is：The super superficial layer of graphene (1-1) is attached to medium substrate layer (1-2) upper surface by chemical precipitation method.
5. a kind of broadband circle polarized converter of frequency-tunable based on graphene according to claim 1, its feature
It is：Graphene floor layer (1-3) is attached to medium substrate layer (1-2) lower surface by random stacking.
6. a kind of broadband circle polarized converter of frequency-tunable based on graphene according to claim 1, its feature
It is：Medium substrate layer (1-2) is silicon chip.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110571527A (en) * | 2019-09-27 | 2019-12-13 | 西安电子科技大学 | Graphene composite super-surface-based electromagnetic wave adjustable polarization converter |
| CN111682319A (en) * | 2020-04-14 | 2020-09-18 | 中国计量大学 | Design method of novel broadband tunable coding super surface based on metal-graphene |
| CN111987473A (en) * | 2020-09-17 | 2020-11-24 | 西安电子科技大学 | Vortex multi-beam super-surface Cassegrain antenna with reconfigurable polarization |
-
2017
- 2017-07-14 CN CN201720855816.1U patent/CN207021384U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110571527A (en) * | 2019-09-27 | 2019-12-13 | 西安电子科技大学 | Graphene composite super-surface-based electromagnetic wave adjustable polarization converter |
| CN110571527B (en) * | 2019-09-27 | 2021-01-29 | 西安电子科技大学 | Graphene composite super-surface-based electromagnetic wave adjustable polarization converter |
| CN111682319A (en) * | 2020-04-14 | 2020-09-18 | 中国计量大学 | Design method of novel broadband tunable coding super surface based on metal-graphene |
| CN111987473A (en) * | 2020-09-17 | 2020-11-24 | 西安电子科技大学 | Vortex multi-beam super-surface Cassegrain antenna with reconfigurable polarization |
| CN111987473B (en) * | 2020-09-17 | 2021-06-01 | 西安电子科技大学 | Vortex multi-beam super-surface Cassegrain antenna with reconfigurable polarization |
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