CN208173803U - Terahertz wave absorbing device that a kind of broadband based on graphene and Meta Materials is adjustable - Google Patents
Terahertz wave absorbing device that a kind of broadband based on graphene and Meta Materials is adjustable Download PDFInfo
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- CN208173803U CN208173803U CN201820719235.XU CN201820719235U CN208173803U CN 208173803 U CN208173803 U CN 208173803U CN 201820719235 U CN201820719235 U CN 201820719235U CN 208173803 U CN208173803 U CN 208173803U
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Abstract
The utility model discloses a kind of adjustable Terahertz wave absorbing devices in broadband based on graphene and Meta Materials.The wave absorbing device is made of the graphene layer of bottom first layer metal layer, second layer dielectric layer, the graphene layer of third layer periodic structure, the 4th layer of dielectric isolation layer and top layer 5 periodic structure；Graphene has huge absorptivity, forms one by the interaction between five layers and absorbs biggish broadband wave absorbing device to THz wave, and application voltage can change the fermi level in two graphene layers in the wave absorbing device, realizes that absorption spectra is adjustable.The utility model breaks the relatively narrow limitation of absorption band of traditional Meta Materials, joined the graphene of structuring while service life is less than the metamaterial structure of wavelength, forms the adjustable Terahertz wave absorbing device in broadband.The utility model structure is simple, is easily worked, and assimilation effect is preferable.
Description
Technical field
The utility model belongs to rubber-ferrite technical field, is related to the adjustable terahertz in broadband of a kind of graphene and Meta Materials
Hereby wave absorbing device.
Background technique
With the development of modern science and technology, influence of the electromagenetic wave radiation to environment increasingly increases.Airport, machine flight because
Electromagnetic Interference can not take off and overdue;The normal work of various electronic instrument for diagnosing and curing diseases devices can be often interfered in hospital, mobile phone.Cause
This, in order to administer electromagnetic pollution, rubber-ferrite technology is more and more important.In addition, since it is in the side such as stealthy, detection and communication
Face also has great application value, thus the application of rubber-ferrite technology is also more and more extensive.
On March 18th, 2017, University of Electronic Science and Technology propose " a kind of double-frequency broadband application No. is 201710162657.1
Wave absorbing device ", including periodically inhale wave surface structure, first layer medium substrate, periodic frequency selection surface texture, the second layer and be situated between
Matter substrate, metallic shield floor and the plastic screw for connecting first layer medium substrate Yu second layer medium substrate；Period
Property inhale wave surface structure be printed on first layer medium substrate by include symmetrical two sheet metals, symmetrical two
Split ring resonator and the absorbent structure unit for being welded on resistance between two metal disk arms are constituted.Periodic frequency selectivity
Surface texture, which is printed on, to be made of multiple metal resonant elements on second layer medium substrate.Metallic shield floor is printed on second
The reverse side of layer medium substrate.Split ring resonator and metal resonant element collective effect realize the spy of the reflection in certain band limits
Property, so that constituting double-frequency broadband inhales wave.The wave absorbing device structure is more complicated, and difficulty of processing is larger；On June 30th, 2017, west
Peace University of Electronic Science and Technology proposes " a kind of bandwidth of operation based on graphene Yu super surface application No. is 201710523269.1
Adjustable wave absorbing device ", frequency-selective surfaces, three layers of medium substrate and the metal bottom including DC power supply and from top to bottom stacked gradually
Plate；Air dielectric is added between second dielectric layer and metal base plate, and it is wide to have broadened suction wavestrip；Wherein frequency-selective surfaces are by m × n
Dumb-bell shape periodic unit is constituted, and dumb-bell shape unit upper and lower side is to be equipped with graphene film interlayer with what vertical plain conductor connected
Metal patch, horizontal metal thin wire is through full line single dumbbell unit concatenation one.As can be seen that the wave absorbing device is with more
The structure of laminar, however the structure of multiple field keeps difficulty of processing bigger.
Meta Materials refer to that its characteristic dimension is much smaller than a kind of artificial material of operation wavelength, and many natural materials may be implemented
Expect the function that can not be realized.Meta Materials due to the novel multiplicity of the function that may be implemented and the sub-wavelength dimensions property of itself,
It is very suitable to the application of micro-optical function device.Graphene be single layer of carbon atom it is tightly packed at bi-dimensional cellular shape structure material
Material, lattice are the regular hexagon honeycomb structure that carbon atom ordered arrangement is formed, and have zero band gap band structure, good
The peculiar physicochemical characteristics such as electric conductivity, the electron mobility of superelevation, in addition, although graphene be it is optically transparent, it
With huge absorptivity, absorptivity is bigger in the single layer and Terahertz in optical range, and the property of graphene may be used also
To be adjusted by applied voltage.
Summary of the invention
For the defects in the prior art and present Research, the utility model provide a kind of based on graphene and Meta Materials
The adjustable Terahertz wave absorbing device in broadband.
To achieve the goals above, technical solution adopted in the utility model is：
Terahertz wave absorbing device that a kind of broadband based on graphene and Meta Materials is adjustable, by bottom first layer metal layer, second
Layer dielectric layer, the graphene layer of third layer periodic structure, the 4th layer of dielectric isolation layer and top layer 5 are periodical
The graphene layer of structuring is constituted；Metal is plated to the one side of the dielectric layer of one piece of surfacing by evaporation process, then separately
Graphene-structured on one side manufactures eight-sided formation using photolithographic exposure technology, or can use electron beam or nano impression
Photoetching technique manufactures finer structure, and wherein graphene can be made by graphite oxide reduction method.
The adjustable Terahertz wave absorbing device in a kind of broadband based on graphene and Meta Materials described in the utility model, feature exist
In：There is two layers of graphene layer, separated among this two layers graphene layer there are also one layer of dielectric isolation layer, is i.e. third layer and the
Five layers are graphenes, and intermediate 4th layer is dielectric isolation layer, in this way the property will pass through Electrostatic Control to adjust them, i.e.,
Realize the adjustable function in broadband；The graphene of periodic structure is eight-sided formation.
The technical principle of the utility model is：In order to adjust their property by Electrostatic Control, we are in two layers of stone
One layer of dielectric isolation layer is added among black alkene layer, each graphene film plays the role of gate electrode.Applying voltage can be at two
Change fermi level in graphene layer.Secondly, the graphene layer of structuring should be electrically connected, otherwise cannot by apply voltage come
Change the attribute of entire layer, therefore, we select dielectric as the separation layer between two layers of graphene.In order to make Meta Materials pole
Change insensitive（Under normal incidence）, structure cell should be at least C 4 Symmetrically, we select the eight-sided formation of graphene.
There is graphene huge absorptivity can release suction by describing graphene property with the method for active surface conductivity
The chemical potential of yield and graphene has relationship, reaches absorptivity therefore, it is possible to find out an optimal graphene chemical potential value
Highest realizes that ultra wide band absorbs.
Compared with prior art, the characteristic with advantage of the utility model are：
1, eight-sided formation can obtain broader absorption spectrum, and absorptivity is higher, furthermore, it is possible to by changing stone
The geometry of black alkene adjusts the frequency spectrum.
2, the absorption spectrum of the wave absorbing device is strongly depend on the chemical potential of graphene, can pass through the chemistry of adjusting graphene
Gesture realizes different absorption spectrums.
3, the wave absorbing device part uses three dimensional periodic structure, simple and compact for structure, produces convenient for large-scale integrated.
Detailed description of the invention
Fig. 1 is the three dimensional structure diagram of the utility model embodiment.
Fig. 2 is the cellular construction plan view of the utility model embodiment.
Fig. 3 is the utility model embodiment 0eV, 0.1eV, 0.2eV, 0.6eV chemical potential absorption curve figure.
Fig. 4 is the absorption curve figure of the utility model embodiment 0.6eV difference chemical potential.
Specific embodiment
With reference to the accompanying drawing and specific example, it is further described and illustrates the utility model.
One embodiment according to the present utility model is as illustrated in fig. 1 and 2, mainly by bottom first layer metal layer, second
Layer dielectric layer, the graphene layer of third layer periodic structure, the 4th layer of dielectric isolation layer and top layer 5 are periodical
The graphene layer of structuring is constituted.
Cellular construction plan view such as Fig. 2 of the octagonal graphene layer of periodicity, period t=15 μm, w=2 μm, the
The thickness of three layers and layer 5 graphene is respectively c=100nm, e=100nm；The dielectric is that a kind of refractive index is 1.53
Dielectric substance keeps it lower in Terahertz range internal loss, thickness b=35.9 μm of second layer dielectric layer, and the 4th layer of electricity is situated between
Thickness d=0.8 μm of matter separation layer；The metal is a kind of perfect electric conductor, is greater than in the conductivity of terahertz wave band
Perfect electric conductor boundary be arranged when being emulated with FDTD, make its reflectivity by 107S/m, thickness a=100nm of metal layer
Zero and the incidence angle independent of light polarization.
One of most important property of graphene is electric adjustability, and therefore, we analyze graphene under different chemical potentials
To the assimilation effect of THz wave, when chemical potential is 0eV, 0.1eV, 0.2eV, when 0.6eV, we are emulated soft by using FDTD
Part obtains Fig. 3, and eight-sided formation can obtain broader absorption spectrum as seen from Figure 3, when chemical potential is 0.6eV, inhales
Yield reaches 90% or more.In addition, we can also adjust the frequency spectrum by changing the geometry of octagon graphene.Together
When keep other parameters it is constant, chemical potential be 0.6eV when, absorptivity greater than 90% bandwidth reach 1.2THz, realize more
Ideal ultra wide band absorbs.As shown in Figure 4.
Claims (2)
1. the adjustable Terahertz wave absorbing device in broadband based on graphene and Meta Materials, it is characterised in that：Successively by bottom first layer gold
Belong to layer (1), second layer dielectric layer (2), the graphene layer (3) of third layer periodic structure, the 4th layer of dielectric isolation layer
(4) it is constituted with the graphene layer (5) of top layer 5 periodic structure；The stone of third layer periodic structure in each unit
The shape of the graphene layer (5) of black alkene layer (3) and top layer 5 periodic structure is octagon, period t=15 μm；When entering
Light is penetrated after the incidence of top, the collective effect of the five-layer structure can form strong absorption to incident light, constitute wave absorbing device.
2. the adjustable Terahertz wave absorbing device in broadband as described in claim 1 based on graphene and Meta Materials, it is characterised in that：Institute
Stating bottom first layer metal layer (1) is a kind of perfect electric conductor, is greater than 107S/m, metal in the conductivity of terahertz wave band
Thickness a=100nm of layer；The material of the second layer dielectric layer (2) is a kind of dielectric substance that refractive index is 1.53, thick
Spend b=35.9 μm；Third layer graphene layer (3) thickness c=100nm；The material of the 4th layer of dielectric isolation layer (4) is
A kind of dielectric substance that refractive index is 1.53, thickness d=0.8 μm；The top layer 5 graphene layer thickness e=100nm.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109449545A (en) * | 2018-12-19 | 2019-03-08 | 桂林电子科技大学 | A kind of achievable Terahertz converter for inhaling wave mode and polarization conversion pattern switching |
| CN109586042A (en) * | 2018-12-03 | 2019-04-05 | 中国科学技术大学 | A kind of wave absorbing device and preparation method thereof |
| CN109638472A (en) * | 2019-01-31 | 2019-04-16 | 电子科技大学 | A kind of dynamic-tuning type wave absorbing device based on metallic graphite carbon alkene Meta Materials |
| CN110366361A (en) * | 2019-08-06 | 2019-10-22 | 集美大学 | A kind of wave absorbing device based on super surface |
| CN110398180A (en) * | 2019-08-13 | 2019-11-01 | 杨婷 | A kind of reflective concealed device surpassing surface based on graphene |
| CN110927843A (en) * | 2019-12-23 | 2020-03-27 | 中国人民解放军国防科技大学 | Adjustable perfect wave absorber based on graphene photonic crystal structure |
| CN111525272A (en) * | 2020-04-06 | 2020-08-11 | 桂林电子科技大学 | Broadband terahertz wave absorber based on three-dart-shaped graphene |
| CN111613902A (en) * | 2020-07-09 | 2020-09-01 | 中国计量大学 | Tunable terahertz wave absorber |
| CN111883935A (en) * | 2020-09-03 | 2020-11-03 | 浙江科技学院 | Terahertz wave absorber based on graphene metamaterial |
| CN112014350A (en) * | 2020-08-13 | 2020-12-01 | 中国计量大学 | Reflective terahertz refractive index adjustable sensor |
| CN112436293A (en) * | 2020-11-24 | 2021-03-02 | 重庆邮电大学 | Terahertz wave absorber with adjustable polarization dependence based on graphene |
| CN113178707A (en) * | 2021-04-23 | 2021-07-27 | 西安交通大学 | Graphene-based broadband adjustable terahertz wave absorber |
| CN113328261A (en) * | 2021-05-11 | 2021-08-31 | 中国科学院上海光学精密机械研究所 | Double-resonance broadband transparent metamaterial wave absorber based on toothed bending ring and square ring |
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2018
- 2018-05-15 CN CN201820719235.XU patent/CN208173803U/en not_active Expired - Fee Related
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109586042A (en) * | 2018-12-03 | 2019-04-05 | 中国科学技术大学 | A kind of wave absorbing device and preparation method thereof |
| CN109449545A (en) * | 2018-12-19 | 2019-03-08 | 桂林电子科技大学 | A kind of achievable Terahertz converter for inhaling wave mode and polarization conversion pattern switching |
| CN109449545B (en) * | 2018-12-19 | 2024-02-13 | 桂林电子科技大学 | Terahertz converter capable of realizing switching between wave-absorbing mode and polarization conversion mode |
| CN109638472A (en) * | 2019-01-31 | 2019-04-16 | 电子科技大学 | A kind of dynamic-tuning type wave absorbing device based on metallic graphite carbon alkene Meta Materials |
| CN110366361A (en) * | 2019-08-06 | 2019-10-22 | 集美大学 | A kind of wave absorbing device based on super surface |
| CN110398180B (en) * | 2019-08-13 | 2022-04-26 | 杨婷 | Reflection type stealth method based on graphene super surface |
| CN110398180A (en) * | 2019-08-13 | 2019-11-01 | 杨婷 | A kind of reflective concealed device surpassing surface based on graphene |
| CN110927843A (en) * | 2019-12-23 | 2020-03-27 | 中国人民解放军国防科技大学 | Adjustable perfect wave absorber based on graphene photonic crystal structure |
| CN111525272A (en) * | 2020-04-06 | 2020-08-11 | 桂林电子科技大学 | Broadband terahertz wave absorber based on three-dart-shaped graphene |
| CN111613902A (en) * | 2020-07-09 | 2020-09-01 | 中国计量大学 | Tunable terahertz wave absorber |
| CN112014350A (en) * | 2020-08-13 | 2020-12-01 | 中国计量大学 | Reflective terahertz refractive index adjustable sensor |
| CN112014350B (en) * | 2020-08-13 | 2022-08-26 | 中国计量大学 | Reflective terahertz refractive index adjustable sensor |
| CN111883935A (en) * | 2020-09-03 | 2020-11-03 | 浙江科技学院 | Terahertz wave absorber based on graphene metamaterial |
| CN111883935B (en) * | 2020-09-03 | 2022-05-20 | 浙江科技学院 | Terahertz wave absorber based on graphene metamaterial |
| CN112436293B (en) * | 2020-11-24 | 2022-07-08 | 重庆邮电大学 | Terahertz wave absorber with adjustable polarization dependence based on graphene |
| CN112436293A (en) * | 2020-11-24 | 2021-03-02 | 重庆邮电大学 | Terahertz wave absorber with adjustable polarization dependence based on graphene |
| CN113178707A (en) * | 2021-04-23 | 2021-07-27 | 西安交通大学 | Graphene-based broadband adjustable terahertz wave absorber |
| CN113328261A (en) * | 2021-05-11 | 2021-08-31 | 中国科学院上海光学精密机械研究所 | Double-resonance broadband transparent metamaterial wave absorber based on toothed bending ring and square ring |
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