CN111697347A - Double-broadband adjustable wave absorber based on graphene - Google Patents
Double-broadband adjustable wave absorber based on graphene Download PDFInfo
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- CN111697347A CN111697347A CN202010648804.8A CN202010648804A CN111697347A CN 111697347 A CN111697347 A CN 111697347A CN 202010648804 A CN202010648804 A CN 202010648804A CN 111697347 A CN111697347 A CN 111697347A
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- graphene
- wave absorber
- adjustable wave
- absorber according
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 239000006096 absorbing agent Substances 0.000 title claims abstract description 47
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 36
- 229910052751 metal Inorganic materials 0.000 claims abstract description 15
- 239000002184 metal Substances 0.000 claims abstract description 15
- 239000010410 layer Substances 0.000 claims description 28
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 235000012239 silicon dioxide Nutrition 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 239000002356 single layer Substances 0.000 claims description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 3
- 229910052737 gold Inorganic materials 0.000 claims description 3
- 239000010931 gold Substances 0.000 claims description 3
- 229910052709 silver Inorganic materials 0.000 claims description 3
- 239000004332 silver Substances 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 2
- 239000010439 graphite Substances 0.000 claims description 2
- -1 graphite alkene Chemical class 0.000 claims description 2
- 230000009977 dual effect Effects 0.000 claims 9
- 238000010521 absorption reaction Methods 0.000 abstract description 18
- 230000010287 polarization Effects 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000005751 Copper oxide Substances 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 229910000431 copper oxide Inorganic materials 0.000 description 1
- 229960004643 cupric oxide Drugs 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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Classifications
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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
- H01Q17/008—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems with a particular shape
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/003—Light absorbing elements
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
The invention provides a graphene-based double-broadband adjustable wave absorber which comprises a plurality of unit structures, wherein each unit structure comprises a bottom layer metal (1), a middle medium layer (2) and a top layer graphene (3), which are sequentially arranged, and the geometric centers of the bottom layer metal (1), the middle medium layer (2) and the top layer graphene (3) are superposed. The wave absorber can realize super-strong absorption of two broad bands, has simple and compact structure, easy manufacture and irrelevant polarization, and still has higher absorptivity when the wave absorber is incident at a large angle.
Description
Technical Field
The invention relates to the technical field of terahertz, in particular to a graphene-based double-broadband adjustable wave absorber.
Background
The terahertz wave is generally an electromagnetic wave with a frequency within the range of 0.1-10 THz and is located between infrared wave and microwave. Due to the fact that the terahertz wave has many unique properties such as transient property, broadband property, low energy property, coherence and the like, the terahertz wave has important application prospects in the fields of basic research, industrial application, medicine, military, biology and communication. At present, a terahertz wave generation source and terahertz wave detection are recognized as two key problems restricting the development of terahertz technology. The absorption and energy capture of the terahertz wave are the basis for realizing terahertz detection and are the core problems of terahertz wave calibration, regulation, conversion and application. Therefore, the terahertz broadband wave absorbing technology becomes one of the hot spots in the current terahertz technical field.
The traditional broadband wave absorber design mainly realizes the broadband wave absorber by combining a plurality of microstructures into a large single-layer structure unit or a stack of a plurality of metal microstructures, but the traditional broadband wave absorber design has some disadvantages: firstly, the research of the wave absorber is mainly focused on a broadband wave absorber, which is not beneficial to practical application; secondly, the structural unit of the device is huge, which is not beneficial to the miniaturization development of the device; thirdly, the difficulty and accuracy of device preparation are increased by stacking with complex structures or multilayer structures, so that the practicability and commercialization of the devices are not facilitated; and fourthly, once the device is manufactured, the absorption performance of the device is difficult to change, and the application requirement cannot be met. The wave absorber designed at present is difficult to simultaneously meet the characteristics of multiple working frequency bands, wide frequency bands, high absorption rate, irrelevance of polarization, insensitivity of large-angle oblique incidence and the like, so that the wave absorber with multiple frequency bands, wide frequency bands, irrelevance of polarization and simple structure has very important practical significance.
Disclosure of Invention
The invention aims to provide a graphene-based double-broadband adjustable wave absorber which has the characteristics of multiple wave absorber coverage frequency bands, wide frequency bands, independence on polarization and insensitivity to large-angle incidence.
The technical scheme is that the graphene-based double-broadband adjustable wave absorber comprises a plurality of unit structures, wherein each unit structure comprises a bottom layer metal (1), a middle medium layer (2) and a top layer graphene (3), which are sequentially arranged, and the geometric centers of the bottom layer metal (1), the middle medium layer (2) and the top layer graphene (3) are overlapped.
The invention is characterized in that:
the plurality of unit structures are arranged periodically.
The plurality of unit structures are arranged periodically, and specifically comprise: the side lengths of the unit structures are equal, and the side lengths of the unit structures are 30-40 micrometers.
The structure of the top graphene (3) is a cross-shaped structure.
The cross-shaped structure comprises four ellipses with completely same geometric shapes, and one end point of the long axes of the four ellipses is superposed with the center of the unit structure, and the other end point is superposed with the diagonal line of the unit structure.
The long axis length of the ellipse is 33-39 microns, and the short axis length of the ellipse is 18-21 microns.
The bottom layer metal (1) is gold, silver, copper or aluminum, and the thickness is 0.2-500 microns.
The middle dielectric layer (2) is made of silicon dioxide and has the thickness of 30-34 micrometers.
The top graphene (3) is of a single-layer atomic arrangement structure.
The bottom metal is used as a reflector.
The invention has the beneficial effects that:
(1) according to the graphene-based double-broadband adjustable wave absorber, the super-strong absorption of two broadband is realized, and the problem that the wave absorber in the prior art is narrow in working frequency band is solved;
(2) the graphene-based double-broadband adjustable wave absorber overcomes the defect that the wave absorber in the prior art is complex in design structure;
(3) the graphene-based double-broadband adjustable wave absorber is irrelevant to polarization, still has higher absorption rate when the wave absorber is obliquely incident at a large angle, and is more universal in the actual problem of oblique incidence than normal incidence, so that the wave absorber is wide in application range and can be applied to the fields of terahertz detection, terahertz imaging, terahertz stealth and the like.
Drawings
FIG. 1: the unit structure of the embodiment of the invention is schematically shown.
FIG. 2: the top view of the unit structure of the embodiment of the invention.
FIG. 3: the embodiment of the invention provides a wave absorber absorption rate curve chart when different polarized waves are normally incident.
FIG. 4: the absorption rate curve chart of the wave absorber when the horizontal polarized wave is obliquely incident is provided by the embodiment of the invention.
FIG. 5: the absorption rate curve chart of the wave absorber when the vertical polarized wave is obliquely incident is provided by the embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 to 2, a graphene-based double-broadband adjustable wave absorber includes a bottom layer metal (1), a middle medium layer (2), and a top layer graphene (3) that are sequentially disposed, and geometric centers of the bottom layer metal (1), the middle medium layer (2), and the top layer graphene (3) are overlapped. The structure of the top graphene (3) is a cross-shaped structure. The cross-shaped structure comprises four ellipses with completely same geometric shapes, and one end point of the long axes of the four ellipses is superposed with the center of the unit structure while the other end point is superposed with the diagonal line of the unit structure;
the long axis length of the ellipse is 33-39 microns, and the short axis length is 18-21 microns;
a plurality of unit structures are arranged periodically.
The plurality of unit structures are arranged periodically, and specifically comprise: the side lengths of the unit structures are equal, and the side lengths of the unit structures are 30-40 micrometers;
the bottom layer metal (1) is gold, silver, copper or aluminum, and the thickness is 0.2-500 microns;
the middle dielectric layer (2) is made of silicon dioxide and has the thickness of 30-34 micrometers;
the top graphene (3) is a monolayer atomic arrangement structure.
The performance of the wave absorber of the invention is verified by software simulation:
the utility model provides a two adjustable wave absorbers of broadband based on graphite alkene, the length of side p of unit structure is 34 microns, and the thickness of bottom layer metal copper is 0.2 micron, and the thickness of middle dielectric layer silica is 32 microns, and oval major axis is 39 microns for L, and the minor axis is 18.5 microns for m.
Fig. 3 is a graph of the absorption rate of the wave absorber calculated by simulation when different polarized waves are normally incident. Here, the chemical potential of graphene is set to 0.9eV and the relaxation time is set to 0.13 ps. The wave absorber has the advantages that the structure of the wave absorber has strong absorption characteristic on incident terahertz waves, the absorption rate can be realized within the frequency ranges of 0.68-1.64 THz and 3.34-4.09 THz and is not less than 90%, the wave absorber is insensitive to the polarization mode, and the absorption rates under horizontal polarization and vertical polarization are completely the same.
Fig. 4 and 5 are absorption rate graphs of the wave absorber when horizontally polarized waves and vertically polarized waves are obliquely incident, respectively, and the wave absorber can still achieve absorption rate of not less than 80% in the frequency ranges of 0.67-1.71 THz and 3.5-4.15 THz when the incident angle is 40 °.
In conclusion, the absorption frequency band, the absorption rate and the different polarization oblique incidence absorption performance of the wave absorber have obvious design characteristics, and can adapt to different application environments and performance requirements through the adjustment of the thickness of the silicon dioxide dielectric layer and the periodic structure parameters of the top layer; the wave absorber structure adopts three raw materials of graphene, copper and silicon dioxide media, which are low in cost and easy to obtain, has good economic affordability, and can be widely applied to the fields of broadband stealth materials of terahertz wave bands, wave absorbing skins, wave absorbing devices and the like.
Claims (10)
1. The utility model provides an adjustable wave absorber of two broadband based on graphite alkene which characterized in that: the graphene-based photovoltaic cell comprises a plurality of cell structures, wherein each cell structure comprises a bottom layer metal (1), a middle medium layer (2) and a top layer graphene (3) which are sequentially arranged, and the geometric centers of the bottom layer metal (1), the middle medium layer (2) and the top layer graphene (3) are overlapped.
2. The graphene-based dual broadband adjustable wave absorber according to claim 1, characterized in that: the plurality of unit structures are arranged periodically.
3. The graphene-based dual broadband adjustable wave absorber according to claim 2, wherein: the plurality of unit structures are arranged periodically, and specifically comprise: the side lengths of the unit structures are equal, and the side lengths of the unit structures are 30-40 micrometers.
4. The graphene-based dual broadband adjustable wave absorber according to claim 1, characterized in that: the bottom layer metal (1) is gold, silver, copper or aluminum, and the thickness is 0.2-500 microns.
5. The graphene-based dual broadband adjustable wave absorber according to claim 1, characterized in that: the middle dielectric layer (2) is made of silicon dioxide and has the thickness of 30-34 micrometers.
6. The graphene-based dual broadband adjustable wave absorber according to claim 1, characterized in that: the structure of the top graphene (3) is a cross-shaped structure.
7. The graphene-based dual broadband adjustable wave absorber according to claim 6, wherein: the cross-shaped structure comprises four ellipses with completely same geometric shapes, and one end point of the long axes of the four ellipses is superposed with the center of the unit structure, and the other end point is superposed with the diagonal line of the unit structure.
8. The graphene-based dual broadband adjustable wave absorber according to claim 7, wherein: the long axis length of the ellipse is 33-39 microns, and the short axis length of the ellipse is 18-21 microns.
9. The graphene-based dual broadband adjustable wave absorber according to claim 1, characterized in that: the top graphene (3) is of a single-layer atomic arrangement structure.
10. The graphene-based dual broadband tunable absorber of claim 1, wherein the bottom metal (1) is used as a mirror.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010648804.8A CN111697347A (en) | 2020-06-30 | 2020-06-30 | Double-broadband adjustable wave absorber based on graphene |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010648804.8A CN111697347A (en) | 2020-06-30 | 2020-06-30 | Double-broadband adjustable wave absorber based on graphene |
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| Publication Number | Publication Date |
|---|---|
| CN111697347A true CN111697347A (en) | 2020-09-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010648804.8A Pending CN111697347A (en) | 2020-06-30 | 2020-06-30 | Double-broadband adjustable wave absorber based on graphene |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111697347A (en) |
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2020
- 2020-06-30 CN CN202010648804.8A patent/CN111697347A/en active Pending
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Application publication date: 20200922 |