CN111600134A - Graphene wave-absorbing metamaterial for encrypting computer display - Google Patents
Graphene wave-absorbing metamaterial for encrypting computer display Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0086—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices having materials with a synthesized negative refractive index, e.g. metamaterials or left-handed materials
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
- H05K9/0084—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising a single continuous metallic layer on an electrically insulating supporting structure, e.g. metal foil, film, plating coating, electro-deposition, vapour-deposition
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Abstract
The invention relates to a graphene wave-absorbing metamaterial for encrypting a computer display, which comprises a plurality of metamaterial structure units which are periodically arranged, wherein each metamaterial structure unit comprises a metamaterial structure I and a metamaterial structure II, the metamaterial structure I comprises a first conducting layer and a first medium layer, the first conducting layer is arranged on the first medium layer, a double-L-shaped structure which is symmetrical along the center of the metamaterial structure unit is arranged on the first conducting layer, the metamaterial structure II comprises a second conducting layer and a second medium layer, the second conducting layer is arranged on the second medium layer, a four-L-shaped structure which is symmetrical along the center of the metamaterial structure unit is arranged on the second conducting layer, and the edges of the L-shaped structure are respectively parallel to the edges of the corresponding metamaterial structure units; the invention has small thickness, the electromagnetic wave absorption rate of the invention to the working frequency band within the range of 8.25GHz-17.35GHz is higher than 90%, and the average transmittance of the visible light wave band is 85%; the invention relates to the technical field of electromagnetic protection.
Description
Technical Field
The invention relates to the technical field of electromagnetic protection, in particular to a graphene wave-absorbing metamaterial for an encrypted computer display.
Background
With the wide application of electronic components and electronic equipment, the electromagnetic radiation generated by the electronic components and the electronic equipment brings great convenience, and also influences the daily life of people, so that the electromagnetic environment of human living space is worsened more and more. The electromagnetic interference generated by the electromagnetic interference can not only generate serious interference to electronic equipment such as computers, instruments and the like, but also even generate irreversible damage, and simultaneously, the electromagnetic interference also has certain harm to personnel in an electromagnetic environment. Therefore, the requirements for electromagnetic shielding are put forward in many fields, and especially for the observation windows of aerospace equipment, communication equipment encryption computers, precision instrument panels and the like, the requirements for high optical transmittance are required, and the requirements for electromagnetic shielding must be met to ensure the realization of precision detection and observation.
At present, the electromagnetic shielding material is usually an electromagnetic shielding material mainly based on reflection, such as a wide band gap oxide semiconductor, a metal coating, etc., and although part of the material or structure meets the requirement of light transmittance, secondary electromagnetic radiation pollution is caused. Therefore, for electromagnetic shielding applications, it is necessary to develop electromagnetic wave-absorbing materials with dominant absorption.
In the early stage of research on transparent wave-absorbing materials, researchers use more materials such as metal grids, Indium Tin Oxide (ITO) and graphene, and the materials are prepared according to the principle of Salisbury screen resonance absorption. In order to further expand the wave-absorbing bandwidth, a plurality of Salisbury screen superposition technologies are generally utilized, but the wave-absorbing bandwidth is expanded at the expense of the visible light transmittance.
Different from an ITO film and a metal grid, the graphene has ultrahigh light transmittance and excellent electrical properties, so that the graphene becomes an effective way for realizing a high-transparency microwave absorbing material. The electromagnetic property of the artificial metamaterial structure depends on the periodic patterned structural features rather than the chemical composition of the periodic patterned structural features, the artificial metamaterial structure is combined with the graphene film, the transparent efficient conductive film can be endowed with radar wave absorption loss, and the method has important significance in the field of electromagnetic protection.
M. Grande et al propose a method of manufacturing a transparent glass panel with a substrate of lossless high transparency based on the principle of Salisbury screen (Grande M,et al. Optically transparent microwave screens based on engineeredgraphene layers[J]the upper layer and the lower layer are of a wave absorber structure of a graphene film, and the wave absorber realizes more than 80% of absorption in a frequency band of 8.5-9.5GHz under the thickness of 3.6 mm. In a visible light range, the actually measured light transmittance of the prepared sample is more than 80%, but the application of the sample is greatly limited due to the narrow wave-absorbing bandwidth.
D. Yi et al propose a tunable graphene microwave absorber (Yi D,et al. TunableMicrowave Absorber Based on Patterned Graphene[J]IEEE Transactions on microwave Theory and Techniques, 2017, 65(8): 2819-.
Caiqiang et al designed a 3-layer composite structure of a graphene metamaterial structure layer, an air layer and a metal layer (Caiqiang et al, broadband wave absorption of the graphene metamaterial composite structure, Chinese laser 2017, 44(10): 1003005.), and realized the expansion of the working bandwidth under the condition of high absorption rate by oscillating the metal layer and the graphene metamaterial structure layer for many times by using electromagnetic waves. However, when the wave absorbing rate is required to be more than 90%, the wave absorbing bandwidth is too narrow, so that the application scenario is greatly limited.
Therefore, the development of a wave-absorbing material with visible, ultra-thin and broadband characteristics of a metamaterial structure has become a current urgent subject.
Disclosure of Invention
In order to overcome the defects in the prior art, the graphene wave-absorbing metamaterial for the encrypted computer display has the characteristics of visibility, ultrathin property and wide frequency.
In order to solve the technical problems, the invention adopts the technical scheme that:
a graphene wave-absorbing metamaterial for encrypting a computer display comprises a plurality of metamaterial structure units which are periodically arranged, wherein each metamaterial structure unit comprises a double-layer metamaterial structure which is a metamaterial structure I and a metamaterial structure II;
the metamaterial structure I comprises a first conducting layer and a first dielectric layer, the first conducting layer is arranged on the first dielectric layer, a double-L-shaped structure which is symmetrical along the center of the metamaterial structural unit is arranged on the first conducting layer, and the edges of the L-shaped structure are respectively parallel to the edges of the corresponding metamaterial structural unit;
the metamaterial structure II comprises a second conducting layer and a second dielectric layer, the second conducting layer is arranged on the second dielectric layer, four L-shaped structures which are symmetrical along the center of the metamaterial structural unit are arranged on the second conducting layer, and the edges of the L-shaped structures are respectively parallel to the edges of the corresponding metamaterial structural units.
Further, the first conducting layer and the second conducting layer are both of film-based metamaterial structures, and are made of any one of graphene films, metal grids and nano silver wires.
Furthermore, the first dielectric layer and the second dielectric layer are made of any one of glass, polycarbonate, poly terephthalic acid plastic and polydimethylsiloxane.
Further, the dielectric constants of the first dielectric layer and the second dielectric layer are in a range of 1 to 10, and the loss tangent value range is as follows: 0.0009-0.025, thickness range: 0.1-5 mm;
the sheet resistance value ranges of the first conducting layer and the second conducting layer are as follows: 30-500 omega/sq.
Furthermore, the metamaterial structure I and the metamaterial structure II adopt an alignment technology, and an upper layer and a lower layer are aligned and bonded by utilizing a conductive adhesive bonding process.
Further, the thickness of the conductive adhesive is 0.1mm +/-0.05 mm.
Further, the graphene wave-absorbing metamaterial has the working frequency band range as follows: 8.25GHz-17.35 GHz.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention improves the impedance matching characteristic of the wave-absorbing material by utilizing the periodic microstructure etched by the conductive films with different sheet resistance values based on the impedance matching characteristic, so that the electromagnetic waves are easier to be incident.
2. Based on attenuation characteristics, the invention utilizes mutual coupling loss of electromagnetic waves between upper and lower layer graph structures, thereby improving wave absorbing performance; the light transmission performance of the product is improved by utilizing the high light transmission of the conductive film.
3. Compared with the traditional wave-absorbing material, the thickness is reduced from 10mm to 2.5mm, the absorption rate of the working frequency band in the range of 8.25GHz-17.35GHz is higher than 90%, the average transmittance of the visible light wave band is 85%, and the wave-absorbing material has the characteristics of metamaterial, ultra-thinness and broadband.
Drawings
The following will explain embodiments of the present invention in further detail through the accompanying drawings.
FIG. 1 is a schematic structural diagram of a metamaterial structural unit;
FIG. 2 is a schematic diagram of a unit structure of a metamaterial structure I;
FIG. 3 is a schematic diagram of a unit structure of a metamaterial structure II;
FIG. 4 is a current intensity distribution of the metamaterial structure I when a resonance point operates at 9.5 GHz;
FIG. 5 is a current intensity distribution of the metamaterial structure I when a resonance point operates at 15 GHz;
FIG. 6 is a current intensity distribution of the metamaterial structure II when the resonance point operates at 9.5 GHz;
FIG. 7 is a current intensity distribution of the metamaterial structure II when the resonance point operates at 15 GHz;
FIG. 8 is a schematic overall structure diagram of a metamaterial structure I;
FIG. 9 is an overall structural schematic diagram of a metamaterial structure II;
FIG. 10 is a schematic structural diagram of a graphene wave-absorbing metamaterial;
fig. 11 is a test result of the wave-absorbing property of the wave-absorbing material tested by the bow method.
In the figure: the structure comprises a metamaterial structure I1, a first conducting layer 11, a first dielectric layer 12, a double L-shaped structure 13, a metamaterial structure II 2, a second conducting layer 21, a second dielectric layer 22, a four L-shaped structure 23 and a metamaterial structural unit 3.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b):
as shown in fig. 1 to 11, a graphene wave-absorbing metamaterial for encrypting a computer display includes a plurality of metamaterial structural units 3 arranged periodically, each metamaterial structural unit 3 includes a double-layer metamaterial structure, which is a metamaterial structure i 1 and a metamaterial structure ii 2;
the metamaterial structure I1 comprises a first conducting layer 11 and a first medium layer 12, the first conducting layer 11 is arranged on the first medium layer 12, double L-shaped structures 13 which are symmetrical along the center of the metamaterial structural unit 3 are arranged on the first conducting layer 11, and the edges of the L-shaped structures are respectively parallel to the edges of the corresponding metamaterial structural units 3; the first conductive layer 11 has a square resistance of S1The first dielectric layer 12 has a thickness h1A dielectric constant ofe 1。
The metamaterial structure II 2 comprises a second conducting layer 21 and a second dielectric layer 22, the second conducting layer 21 is arranged on the second dielectric layer 22, four L-shaped structures 23 which are symmetrical along the center of the metamaterial structural unit 3 are arranged on the second conducting layer 21, and the edges of the L-shaped structures are respectively parallel to the edges of the corresponding metamaterial structural units 3; the second conductive layer 21 has a square resistance of S2A second mediumThe layer 22 has a thickness h2A dielectric constant ofe 2。
The parameters of the metamaterial unit structure 3 in this embodiment are: l =8.9mm, w =8.9mm, l1=5.0mm，l2=3.1mm，l3=1.6mm，l4=5.0mm，w1=0.3mm，w2=0.8mm。
Dielectric constant of the first dielectric layer 12 and the second dielectric layer 22e 1、e 2Are all 4.8, the loss tangent is 0.0054, and the thickness h10.5mm +/-0.05 mm and thickness h2Is 2mm plus or minus 0.05 mm.
The sheet resistance value ranges of the first conductive layer 11 and the second conductive layer 21 are: 30-500 omega/sq.
The first dielectric layer 12 and the second dielectric layer 22 are made of glass.
The first conductive layer 11 and the second conductive layer 21 are made of graphene.
The metamaterial structure I1 and the metamaterial structure II 2 adopt an alignment technology, and the upper layer and the lower layer of the metamaterial structure I1 and the metamaterial structure II 2 are aligned and bonded by utilizing a conductive adhesive bonding process.
The thickness of the conductive adhesive is 0.1mm +/-0.05 mm.
The working frequency range of the graphene wave-absorbing metamaterial is as follows: 8.25GHz-17.35 GHz.
The invention utilizes the metamaterial structure units etched by the graphene films with the same (or different) sheet resistance value to mutually couple and lose part of electromagnetic waves, thereby realizing the broadband wave absorption characteristic.
Monitoring the current intensity distribution condition of the wave absorption material at the peak absorption position, wherein as shown in the figure, when a resonance point works at 9.5GHz, the current intensity is concentrated at the horizontal and vertical arms of four L; when the resonance point is operated at 15GHz, the current intensity is concentrated at the horizontal and vertical arms of the double L. Therefore, the first resonance point is excited by the four L-shaped metamaterial structural units, and the second resonance point is excited by the double L-shaped metamaterial structural units.
The wave-absorbing property of the wave-absorbing material is obtained by adopting an arch method, and the test result is shown in the figure: the absorption rate of the working frequency band is higher than 90% in the range of 8.25GHz-17.35GHz, and the working frequency band covers an X wave band (8.25 GHz-12 GHz) and a Ku wave band (12 GHz-17.35 GHz).
The average transmittance of the graphene wave-absorbing metamaterial in a visible light wave band is 85%.
The preparation method comprises the following steps:
the graphene material in the invention can be prepared by using a CVD method: under the condition of low pressure, copper is used as a metal catalyst substrate, methane, long-chain alkane and the like are used as carbon sources, and the method comprises the following basic steps: (1) adsorbing a carbon source on the surface of the catalyst; (2) desorbing a carbon source; (3) dehydrolysis of carbon sources; (4) migration of carbon atoms at the catalyst surface; (5) directly nucleating carbon atoms on the surface and growing into graphene; (6) carbon atoms are fused into a metallic copper phase at high temperature; (7) carbon atoms are diffused in the metal body; (8) and (4) cooling, precipitating carbon atoms from a metal phase, and forming and growing graphene on the surface.
The metamaterial structures can be prepared using a laser etching technique: drawing a needed wave-absorbing material graph by using CAD drawing software, wherein the size of a metamaterial structural unit is 8.9mm multiplied by 8.9mm, the number of cycles is 20 multiplied by 20, and the overall size of the graphene wave-absorbing metamaterial is 180mm multiplied by 2.5 mm; drawing a blue-white microstructure process diagram by a laser drawing machine; the high-quality low-power laser beam is focused into a very small light spot, high power density is formed at the focus, the blue pattern part is vaporized and evaporated instantly to form a metamaterial structural unit, the alignment technology is adopted, the upper layer and the lower layer are aligned and bonded by using a conductive adhesive bonding process, and the thickness of the conductive adhesive is 0.1mm +/-0.05 mm.
Although only the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art, and all changes are encompassed in the scope of the present invention.
Claims (7)
1. The utility model provides a graphite alkene meta-material of inhaling wave for encrypting computer display which characterized in that: the metamaterial structure comprises a plurality of metamaterial structure units (3) which are periodically arranged, wherein each metamaterial structure unit comprises a double-layer metamaterial structure which is a metamaterial structure I (1) and a metamaterial structure II (2);
the metamaterial structure I (1) comprises a first conducting layer (11) and a first medium layer (12), the first conducting layer (11) is arranged on the first medium layer (12), a double-L-shaped structure (13) which is symmetrical along the center of the metamaterial structural unit (3) is arranged on the first conducting layer (11), and the edges of the L-shaped structure are respectively parallel to the edges of the corresponding metamaterial structural units;
the metamaterial structure II (2) comprises a second conducting layer (21) and a second dielectric layer (22), the second conducting layer (21) is arranged on the second dielectric layer (22), four L-shaped structures (23) which are symmetrical along the center of the metamaterial structural unit (3) are arranged on the second conducting layer (21), and the edges of the L-shaped structures are respectively parallel to the edges of the corresponding metamaterial structural units.
2. The graphene wave-absorbing metamaterial for encrypting a computer display according to claim 1, wherein the graphene wave-absorbing metamaterial comprises: the first conducting layer (11) and the second conducting layer (21) are both of film-based metamaterial structures and are made of any one of graphene films, metal grids and nano silver wires.
3. The graphene wave-absorbing metamaterial for encrypting a computer display according to claim 1, wherein the graphene wave-absorbing metamaterial comprises: the first dielectric layer (12) and the second dielectric layer (22) are made of any one of glass, polycarbonate, poly terephthalic acid plastic and polydimethylsiloxane.
4. The graphene wave-absorbing metamaterial for encrypting a computer display according to claim 1, wherein the graphene wave-absorbing metamaterial comprises: the dielectric constants of the first dielectric layer (12) and the second dielectric layer (22) are in the range of 1-10, and the loss tangent value range is as follows: 0.0009-0.025, thickness range: 0.1-5 mm;
the sheet resistance value ranges of the first conductive layer (11) and the second conductive layer (21) are as follows: 30-500 omega/sq.
5. The graphene wave-absorbing metamaterial for encrypting a computer display according to claim 1, wherein the graphene wave-absorbing metamaterial comprises: the metamaterial structure I (1) and the metamaterial structure II (2) adopt an alignment technology, and an upper layer and a lower layer are aligned and bonded by utilizing a conductive adhesive bonding process.
6. The graphene wave-absorbing metamaterial for encrypting computer displays according to claim 5, wherein the graphene wave-absorbing metamaterial comprises: the thickness of the conductive adhesive is 0.1mm +/-0.05 mm.
7. The graphene wave-absorbing metamaterial for encrypting a computer display according to claim 1, wherein the graphene wave-absorbing metamaterial comprises: the graphene wave-absorbing metamaterial has the working frequency band range as follows: 8.25GHz-17.35 GHz.
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Cited By (2)
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