CN109193172A - A method of the adjustable wave absorbing device in surface broadband is surpassed based on graphene - Google Patents
A method of the adjustable wave absorbing device in surface broadband is surpassed based on graphene Download PDFInfo
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- CN109193172A CN109193172A CN201810801871.1A CN201810801871A CN109193172A CN 109193172 A CN109193172 A CN 109193172A CN 201810801871 A CN201810801871 A CN 201810801871A CN 109193172 A CN109193172 A CN 109193172A
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- wave
- absorbing device
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- wave absorbing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
- H01Q17/007—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems with means for controlling the absorption
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- Aerials With Secondary Devices (AREA)
Abstract
The invention discloses a kind of methods for surpassing the adjustable wave absorbing device in surface broadband based on graphene.Mainly include the following steps: step (1) in the electromagnetic wave bandwidth of operation that frequency is 15THz~25THz, study the electromagnetic property of the aperture structure of the super surface different shape size of graphene, pass through the design to structure, the structure that can respond different frequency wave band is found out, the incident electromagnetic wave of different frequency is modulated to realize；Step (2) is obtained by sweep parameter optimizes wave absorbing device structure, by transmission line theory, carries out impedance transformation by dielectric layer；Step (3) determines the wave absorbing device of optimized parameter structure, according to the physical mechanism for inhaling wave rate, impedance matching, attenuation characteristic are illustrated, obtains the absorptivity of this wave absorbing device close to 100%.Illustrate that free space and the structure realize perfect impedance matching in resonant frequency point, magnetic resonance realizes synchronous with electric resonance.The advantages such as the present invention realizes wave-absorbing effect by the super surface texture of graphene, and has strong absorption, and structure is simple.
Description
(1) technical field
The present invention relates to one kind to be based on the super adjustable wave absorbing device in surface broadband of graphene, belongs to micro-nano photoelectronics neck
Domain.
(2) background technique
With the development of computer, electromagnetic radiation is full of around people, and researcher is promoted to deepen novel wave-absorbing material
Research.Surpass the wave absorbing device on surface once proposition based on electromagnetism, since it is compared to traditional wave absorbing device, the local using super surface is strong
Electromagnetic coupling resonance, rely primarily on dielectric loss and magnetic loss realize it is perfect inhale wave, bring up that its structure is simple, absorption efficiency is high, matter
Measure frivolous Deng significant advantages.
By surpassing the well-designed of surface texture to graphene, we can produce the broadband super surface of adjustable graphene
Wave absorbing device, not by traditional wave absorbing device in order to enable be incident on body structure surface electromagnetic wave can areflexia, all with transmitted wave
Form travel into inside configuration forward, and being capable of energy in any form the characteristics of being absorbed.Broadband is adjustable
The super surface wave absorbing device of graphene more actual productions life in provide higher utility value.Such as radio frequency identification skill
Art, stealth technology, electromagnetic protection, electromagnetic compatibility and shielding etc..
(3) summary of the invention
It is an object of the invention to propose that a kind of structure is simple, absorptivity is high based on the super adjustable suction in surface broadband of graphene
The method of wave device.
The object of the present invention is achieved like this:
Step (1) studies the super surface of graphene not similar shape in the electromagnetic wave bandwidth of operation that frequency is 15THz~25THz
The electromagnetic property of the aperture structure of shape size, by the design to structural unit, finding out multiple can respond different frequency wave band
Structure, thus realize the incident electromagnetic wave of different frequency is modulated；
Step (2) is obtained by sweep parameter optimizes wave absorbing device structure, according to transmission line theory, by dielectric layer into
Row impedance converts to realize impedance matching；
Step (3) determines the wave absorbing device of optimized parameter structure, is illustrated according to from suction wave rate, impedance matching, attenuation characteristic
Wave absorbing device physical mechanism, obtain the absorptivity of this wave absorbing device close to 100%.Illustrate free space and the structure in resonance frequency
Rate point realizes perfect impedance matching, and magnetic resonance realizes synchronous with electric resonance.
In the step (3), for incident electromagnetic wave, some can directly be reflected to free space and be formed instead
Ejected wave, remaining part are incident to inside configuration to transmit waveshape, and a part is converted into thermal energy or other shapes with ohmic loss
The energy of formula, a part are propagated forward with transmiting waveshape continuation.Therefore, electromagnetic wave absorptivity expression formula are as follows:
A (ω)=1-R (ω)-T (ω)=1- | S11|2-|S21|2 (1)
Wherein, R (ω), T (ω) are respectively reflectivity and transmissivity, S11、S21Respectively the reflection coefficient of wave absorbing device and thoroughly
Penetrate coefficient.S21It is also assumed that being loss factor of the material to electromagnetic wave.It is relatively easy to reduce transmissivity, this structure is using certain
The metal plate of thickness eliminates the transmission of electromagnetic wave.That is T (ω)=0.That is the simplified formula of absorptivity are as follows:
A (ω)=1-R (ω)=1- | S11|2 (2)
Good impedance matching to the electromagnetic wave for being incident to the super surface of electromagnetism use up its maximum possible do not generate reflection play to
Close important role.By transmission line theory it is found that dielectric layer can carry out impedance transformation to realize impedance matching, equivalency tables at this time
Face impedance Z1With free space impedance Z0It is equal.Its reflection coefficient indicates are as follows:
Whereinμ, ε are the magnetic conductivity and dielectric constant of absorbing material respectively, and μ0With
ε0It is the dielectric constant and magnetic conductivity of free space, absorbent properties are better, its reflection coefficient will be lower, when Equivalent Surface hinders
When anti-equal with free space impedance, i.e. Z1=Z0≈377Ω.Magnetic conductivity and dielectric constant indicate are as follows: μ/ε=μ0/ε0At this point,
Reflection R=0 illustrates that incident electromagnetic wave can enter inside configuration with areflexia.
According to EFFECTIVE MEDIUM THEORY it is found that super surface equivalent relative dielectric constant and magnetic conductivity are respectively as follows:
εr(ω)=ε1+ε2、μr(ω)=μ1+μ2 (4)
ByWithEquivalent refractive index can be obtained are as follows: n (ω)=n1+in2, normalize multiple resistance
It is anti-are as follows:
Z (ω)=Re (ω)+iX (ω), the size of transmission coefficient i.e.:
S21=[sin (nkd)-icos (nkd)]-1e-ikd (5)
Euler's transformation is carried out to (5), obtains an exponential form:
ThusInhaling wave rate becomes:
A (ω)=1-R (ω)-T (ω)=1 (7)
In the case where reflection coefficient is zero, to make absorptivity maximum, by increasing refractive index, dielectric constant and magnetic
Conductance imaginary part is realized to reduce transmissivity.
(4) Detailed description of the invention
Fig. 1 is the structure graph of the super adjustable wave absorbing device in surface broadband of graphene.
Fig. 2 is the physical mechanism that electromagnetic wave incident is generated to wave absorbing device.
Fig. 3 be by simulate come wave absorbing device to the absorptivity and reflectance curve figure of electromagnetic wave.
(5) specific embodiment
A specific embodiment of the invention is described further below in conjunction with attached drawing.
One kind being based on the super adjustable wave absorbing device in surface broadband of graphene, specifically includes the following steps:
This wave absorbing device of step (1) includes three-decker, in the electromagnetic wave bandwidth of operation that frequency is 15THz~25THz,
The electromagnetic property for studying the aperture structure of the super surface different shape size of graphene is found out more by the design to structural unit
A structure that can respond different frequency wave band is modulated the incident electromagnetic wave of different frequency to realize.Such as 1 institute of attached drawing
Show, it includes three layers that this structure, which has altogether, is respectively from top to bottom: the super surface texture of graphene of different circular arrangement combinations, thickness
For the silica dioxide medium layer of 1725nm and with a thickness of 100nm, conductivity is the metal base plate of 4.56 × 107s/m.
Step (2) upper layer circular configuration design parameter are as follows: the internal diameter and outer diameter of central circular be respectively 300nm and
1350nm, being dispersed in x-axis into four circular radiuses on positive and negative 45 ° of direction is 95nm；Structural cycle is 2750nm.
Electromagnetic wave at this time we only need to consider its reflectivity and absorptivity.
And reflectivity are as follows:
R (ω)=| S11|2 (1)
Absorptivity are as follows:
A (ω)=1-R (ω)=1- | S11|2 (2)
Setting simulating area first is 15THz~25THz, and the fermi level of graphene is set as 0.9ev, and the relaxation time is
1ps.This incident wave absorbing device of electromagnetic wave vertical surface.According to transmission line theory and EFFECTIVE MEDIUM shelf theory:
Reflection coefficient are as follows:
Transmission coefficient are as follows:
It is as shown in Fig. 3: resonant frequency point occur at 16.97THz, 20.21THz and 23.18THz tri-.And it is opposite
It answers, the curve of reflectivity is then to occur apparent paddy peak at identical resonance frequency point.It is worth mentioning that this is humorous at three
The absorption of vibration frequency point all reaches 100% substantially.
By above-mentioned impedance and reflectance formula, we are worth noting when real part of the super surface texture relative to free impedance
It is 1, imaginary part 0 then illustrates that free space and the structure realize perfect impedance matching in resonant frequency point, and magnetic resonance and electricity are humorous
Vibration realizes synchronization.Illustrate that free space and the structure realize perfect impedance matching in resonant frequency point, that is to say, that irradiation
Enter wave energy completely into inside configuration without transmiting and reflecting away to structure, therefore produces strong resonance.This
When electromagnetic wave almost all enter inside configuration, reflecting component has reached minimum, realizes perfect absorption.
Claims (3)
1. a kind of method for surpassing the adjustable wave absorbing device in surface broadband based on graphene, wherein the wave absorbing device includes three-decker: base
Bottom, dielectric layer and the super surface of graphene, it is characterized in that the following steps are included:
Step (1) studies the super surface different shape ruler of graphene in the electromagnetic wave bandwidth of operation that frequency is 15THz~25THz
The electromagnetic property of very little aperture structure finds out multiple knots that can respond different frequency wave band by the design to structural unit
Structure is modulated the incident electromagnetic wave of different frequency to realize；
Step (2) show that optimizing wave absorbing device structure is hindered using transmission line theory by dielectric layer by sweep parameter
Resistance brings realization impedance；
Step (3) determines the wave absorbing device of optimized parameter structure, according to the suction illustrated from suction wave rate, impedance matching, attenuation characteristic
Wave device physical mechanism obtains the absorptivity of this wave absorbing device close to 100%.Illustrate free space and the structure in resonant frequency point
Realize perfect impedance matching, magnetic resonance realizes synchronous with electric resonance.
2. a kind of method for surpassing the adjustable wave absorbing device in surface broadband based on graphene according to claim 1, in step (3)
In, transmission line theory and medium shelf theory is utilized, some can directly be reflected to free space and form back wave, remaining
Part be incident to inside configuration to transmit waveshape, a part is converted into the energy of thermal energy or other forms with ohmic loss, one
It is propagated forward with transmiting waveshape continuation part.Therefore, electromagnetic wave absorptivity expression formula are as follows:
A (ω)=1-R (ω)-T (ω)=1- | S11|2-|S21|2 (1)
3. a kind of method for surpassing the adjustable wave absorbing device in surface broadband based on graphene according to claim 1, in step (2)
In, describing this structure and having altogether includes three layers, is respectively from top to bottom: the super surface knot of the graphene of different circular arrangement combinations
Structure, with a thickness of the silica dioxide medium layer of 1725nm and with a thickness of 100nm, conductivity is the metal base plate of 4.56 × 107s/m.
Upper layer circular configuration design parameter are as follows: the internal diameter and outer diameter of central circular are 300nm and 1350nm respectively, be dispersed in x-axis at
Four circular radiuses on positive and negative 45 ° of direction are 95nm；Structural cycle is 2750nm.By emulation 16.97THz,
There is resonant frequency point at 20.21THz and 23.18THz tri-.And corresponding is that the curve of reflectivity is then identical humorous
Occurs apparent paddy peak at vibration frequency point.It is worth mentioning that this at three resonant frequency point absorption all reach 100% substantially.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110380228A (en) * | 2019-07-23 | 2019-10-25 | 中国科学技术大学 | A kind of wave absorbing device part based on reflectionless filter principle |
| CN111899820A (en) * | 2020-08-07 | 2020-11-06 | 上海无线电设备研究所 | Rapid design method of dielectric medium type composite absorbent |
| CN113556930A (en) * | 2021-06-23 | 2021-10-26 | 南方科技大学 | Broadband adjustable reflection-free wave absorbing device and wave absorbing method |
-
2018
- 2018-07-20 CN CN201810801871.1A patent/CN109193172A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110380228A (en) * | 2019-07-23 | 2019-10-25 | 中国科学技术大学 | A kind of wave absorbing device part based on reflectionless filter principle |
| CN111899820A (en) * | 2020-08-07 | 2020-11-06 | 上海无线电设备研究所 | Rapid design method of dielectric medium type composite absorbent |
| CN113556930A (en) * | 2021-06-23 | 2021-10-26 | 南方科技大学 | Broadband adjustable reflection-free wave absorbing device and wave absorbing method |
| CN113556930B (en) * | 2021-06-23 | 2023-08-29 | 南方科技大学 | Broadband adjustable reflection-free wave absorbing device and wave absorbing method |
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