CN207689699U - A kind of double frequency-band Terahertz wave absorbing device based on band and continuous layer graphene - Google Patents
A kind of double frequency-band Terahertz wave absorbing device based on band and continuous layer graphene Download PDFInfo
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- CN207689699U CN207689699U CN201820091585.6U CN201820091585U CN207689699U CN 207689699 U CN207689699 U CN 207689699U CN 201820091585 U CN201820091585 U CN 201820091585U CN 207689699 U CN207689699 U CN 207689699U
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Abstract
The utility model provides a kind of double frequency-band Terahertz wave absorbing device based on band and continuous layer graphene, belongs to the wave absorbing device part in Terahertz Technology field, and graphene surface plasma characteristics are utilized, and composition includes：Graphene band（3）, graphene pantostrat（4）, gold constitute metallic substrates（1）, dielectric layer（2）.The utility model mainly goes out absorption spectrum of the graphene to THz wave by finite element method calculating simulation, is optimized to wave absorbing device part structure, obtains efficient double frequency-band Terahertz wave absorbing device.
Description
Technical field
The double frequency-band Terahertz wave absorbing device based on band and continuous layer graphene that the present invention relates to a kind of, belongs to graphene material
Material is in terahertz wave band application field.
Background technology
THz wave refers to electromagnetic wave of the frequency between 0.1THz to 10THz, between millimeter wave and infrared ray, is had simultaneously
There is the part of properties of the two wave bands.As Terahertz Technology is in the application of communication, imaging, sensing etc., people are caused
Very big concern to Terahertz Technology.Few materials can be applied to this wave band in nature at present, mainly be the absence of
Effective THz source and detector, in recent years in order to improve detection efficient and the sensitivity of terahertz detection device, scientific research people
Member starts the research of THz wave absorbing material being placed on vital position, wherein the Terahertz based on Meta Materials inhales wave material
The research of material is an important directions, by the size of change structural unit, material effects can be made in Terahertz frequency range, thus
As a kind of Terahertz wave absorbing device part.
Absorbing material is a kind of the electromagnetic wave being incident on material surface can be converted to thermal energy or other forms energy
A kind of material can reduce the transmission and reflection of electromagnetic wave, to realize the absorption to electromagnetic wave.Typical wave absorbing device part knot at present
Structure is sandwich type：Its top layer is periodical Meta Materials pattern, and centre is one layer of nonmetal medium material, and bottom is opaque
Metal flat.Position and the absorption efficiency of absorption peak are adjusted by adjusting the size of cellular construction.Terahertz wave band due to
The imaginary part of dielectric constant of metal as common surface plasma material it is very big to cannot directly support surface etc. from
Daughter also limits application of the surface plasma in terms of Terahertz inhales wave.
Compared to traditional metal wave absorbing device, the Terahertz wave absorbing device proposed by the present invention based on graphene has structure letter
It is single, it is easy to process, and function admirable, there is double frequency-band efficient absorption.Since the relative dielectric constant real part of graphene is too
Hertz wave band is negative, so showing the property of metal, support surface plasmon in terahertz wave band graphene.Make
For the graphene of new material the hot spot of absorbing material research is become in the characteristic that terahertz wave band is shown.
Invention content
The purpose of this utility model is to provide a kind of double frequency-band Terahertz wave absorbing device based on band and continuous layer graphene,
Provide a kind of simple in structure, the absorption efficiency at 3.67THz and 5.88THz reaches 99% or more double frequency-band efficient absorption.
Technical solution described in the utility model is：
Double frequency-band Terahertz wave absorbing device based on band and continuous layer graphene, the absorber are periodic structure, are used
Top layer graphene band, continuity graphene layer, the spaced composition of bottom graphene strips.Its structure composition is respectively from bottom to top
Metal material is as reflecting layer, medium substrate, to be situated between graphene band, continuity graphene layer, graphene band three
Matter separates.
The double frequency-band Terahertz wave absorbing device based on band and continuous layer graphene in the technical program is with grapheme material
Based on, it can be manufactured by graphite oxide reduction method, the processing of device further includes photoetching and lithographic technique, the utility model
Use the graphene layer of three layers of different in width as absorbing medium.
Advantageous effect described in the utility model is：
1, the double frequency-band Terahertz wave absorbing device described in the utility model based on band and continuous layer graphene is, it can be achieved that double
Frequency band efficient absorption, respectively at 3.67THz and 5.88THz, absorption efficiency reaches 99% or more.
2, the double frequency-band Terahertz wave absorbing device described in the utility model based on band and continuous layer graphene, structure letter
It is single, it is easy to process, double frequency-band efficient absorption is realized using graphene band, continuity graphene, graphene band sandwich.
Description of the drawings
Fig. 1 is the structure chart of double frequency-band Terahertz wave absorbing device of the utility model based on band and continuous layer graphene；
Fig. 2 is the assimilation effect of double frequency-band Terahertz wave absorbing device of the utility model based on band and continuous layer graphene
Figure；
Fig. 3, which is the graphene of double frequency-band Terahertz wave absorbing device of the utility model based on band and continuous layer graphene, to be had
The assimilation effect figure of different chemical potentials；
Contain in the above picture：
w1=1.3um；w2=1.5um;h1=0.4um;h2=0.3um;h3=4.5um;h4=1um;p=2um
1:Gold；2：Dielectric layer；3：Graphene band；4：Continuity graphene.
Specific implementation mode
To make the technical means, creative features, achievement of purpose, and effectiveness of the utility model be easy to understand, below
In conjunction with specific implementation mode, the utility model is furtherd elucidate.
Specific implementation：
As shown in Figure 1：A kind of double frequency-band Terahertz wave absorbing device based on band and continuous layer graphene, composition include：
Graphene band（3）, graphene pantostrat（4）, gold constitute metallic substrates（1）, medium substrate（2）.Period is P, as anti-
The thickness for penetrating the material gold of substrate is h4, and the thickness of medium substrate is h3, and three layer graphenes are respectively that width is w2 from bottom to top
Graphene band, continuity graphene, the graphene band that width is w1, bottom graphene band and intermediate continuity graphite
Thickness of dielectric layers between alkene layer is h2, and the thickness of dielectric layers of continuity graphene and top layer graphene is h1；Here medium material
The refractive index of material is set as 2.2, and the thickness of gold is much larger than the golden skin depth in terahertz wave band, so material gold substrate is visual
For perfect electric conductor（PEC）.
The size of the utility model is smaller, is operated in Terahertz frequency range.
The operation principle of the utility model may be interpreted as：It is the gold of 1um as substrate that the utility model, which uses thickness, due to
It is much larger than its skin depth in the thickness of terahertz wave band metallic substrates, so electromagnetic wave cannot penetrate substrate, Electromgnetically-transparent
Influence can be ignored.Herein legal system graphene array is restored with graphite oxide.In terahertz wave band, work as THz wave
When being incident on graphene strips band, graphene surface plasmon can be inspired（LSPPs）, and in graphene pantostrat
On because Bragg diffraction effect formed non-local surface plasma excimer（DSPPs）, due between LSPPs and DSPPs
The effect of intercoupling so that energy is concentrated mainly on the edge of band, causes the increase of resonance enhancing and absorption efficiency.By resonance
Condition formula 2ksppL+2 δ=2p π（Wherein kspp is graphene surface plasma wave vector, and L is cavity length, and δ is resonance
The phase change at chamber both ends, p are integer）It is found that when the cavity length L of graphene changes, graphene surface plasma
Wave vector can also change, to cause the variation of absorption peak frequency.So when the graphene strips using two layers of different length
When band, different absorption peaks can be obtained, namely obtains double frequency-band of the utility model based on band and continuous layer graphene
Terahertz wave absorbing device.
As shown in Fig. 2, the double frequency-band assimilation effect figure being calculated using finite element method for simulating, and two absorption peaks all exist
99% or more.
As shown in figure 3, being changed when the chemical potential of graphene is respectively 0.6eV, 0.7eV, 0.8eV by the method for doping
Spectrogram is absorbed, and apparent blue-shifted phenomenon occurs for the absorption spectrum, but bimodal absorption frequency is all 95% or more；Low-frequency range
Peak value is displaced to 4.35THz by 3.88THz, but absorption frequency is declined slightly, this is because as graphene chemical potential increases,
Loss increased, and reduce itself and the impedance matching in vacuum；The peak value of high band is displaced to 6.72THz by 5.8THz.
In conclusion above-listed embodiment provided by the utility model, to the purpose of this utility model, technical solution and has
Point has carried out further detailed description, will be understood by, the foregoing is merely the preferable case study on implementation of the utility model,
Be not intended to limit the utility model, it is all within the spirit and principles of the utility model, made by it is any modification, equally replace
It changes, improve, should be included within the scope of protection of this utility model.
Claims (5)
1. a kind of double frequency-band Terahertz wave absorbing device based on band and continuous layer graphene, composition include：Graphene band
（3）, graphene pantostrat（4）, gold constitute metallic substrates（1）, dielectric layer（2）.
2. a kind of double frequency-band Terahertz wave absorbing device based on band and continuous layer graphene according to claim 1, special
Sign is：The graphene strips bandwidth of top layer is 1.3um, and the width of bottom graphene band is 1.5um, the period of total
For 2um.
3. a kind of double frequency-band Terahertz wave absorbing device based on band and continuous layer graphene according to claim 1, special
Sign is：Thickness between top layer graphene band and continuous layer graphene is 0.4um, continuous layer graphene and bottom graphene
The distance of interband is 0.3um, and the thickness of base of dielectric is 4.5um.
4. a kind of double frequency-band Terahertz wave absorbing device based on band and continuous layer graphene according to claim 1, special
Sign is：The thickness of the metal material gold is 1um, and total reflection is incident on the electromagnetic wave of metallic substrates, can regard PEC as.
5. a kind of double frequency-band Terahertz wave absorbing device based on band and continuous layer graphene according to claim 1, special
Sign is：The graphene band and continuous graphite alkene layer chemical potential having the same.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820091585.6U CN207689699U (en) | 2018-01-19 | 2018-01-19 | A kind of double frequency-band Terahertz wave absorbing device based on band and continuous layer graphene |
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| CN201820091585.6U CN207689699U (en) | 2018-01-19 | 2018-01-19 | A kind of double frequency-band Terahertz wave absorbing device based on band and continuous layer graphene |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109411898A (en) * | 2018-10-22 | 2019-03-01 | 桂林电子科技大学 | A method of the adjustable wave absorbing device of Terahertz double frequency-band based on graphene |
| 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 |
-
2018
- 2018-01-19 CN CN201820091585.6U patent/CN207689699U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109411898A (en) * | 2018-10-22 | 2019-03-01 | 桂林电子科技大学 | A method of the adjustable wave absorbing device of Terahertz double frequency-band based on graphene |
| CN109411898B (en) * | 2018-10-22 | 2021-04-23 | 桂林电子科技大学 | Terahertz dual-band adjustable wave absorber based on graphene |
| 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 |
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Granted publication date: 20180803 Termination date: 20190119 |