CN102856663A - Metamaterial, broadband and infrared wave-absorbing structural material - Google Patents
Metamaterial, broadband and infrared wave-absorbing structural material Download PDFInfo
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Abstract
The invention relates to a metamaterial, broadband and infrared wave-absorbing structural material, belonging to the technical field of an electronic functional structural material. The infrared wave-absorbing structural material consists of a surface metamaterial metal patch array, a middle dielectric layer and a bottom continuous metal film. When electromagnetic waves are transmitted into the metamaterial surface, electromagnetic coupling effects can be generated due to interaction between the metal layer and the dielectric layer, and perfect absorption of electromagnetic waves with specific frequency can be realized by reasonable design of the cycle, dimensions and geometric parameters of a unit structure. The metamaterial, broadband and infrared wave-absorbing structural material has the advantages of broad frequency, high absorption performance, no sensitivity to polarization, simple structure, small size and the like, can be used for regulating transmitting characteristics of gray bodies and black bodies and can also be used as an efficient electromagnetic heating device. In addition, the metamaterial, broadband and infrared wave-absorbing structural material has potential of application to such fields of infrared lattice imaging, infrared disguise and measurement of thermal radiation.
Description
Technical field
The invention belongs to the electric function technical field of structural materials, relate to infrared absorbent structure material, particularly a kind of super material broadband infrared absorbent structure material based on three kinds of different rectangular array metal patches.
Background technology
In recent years, super material and is applied to many new fields because its novel physics effect that has and potential using value have been subject to paying close attention to widely, such as negative refractive index material, invisible clothes, perfect lens etc.Theoretical according to effective medium, super material electromagnetic property represent with effective dielectric constant and equivalent permeability.By cycle size and the geometric parameter thereof of the super material of reasonable design, make the electromagnetic wave of itself and incident produce respectively electric resonance and magnetic resonance, thereby correspondingly control its effective dielectric constant and equivalent permeability.In advance research to super material mainly is to carry out the work around its negative magnetoconductivity or negative index characteristic, therefore the real part of the effective dielectric constant of a super material of consideration and the real part of equivalent permeability.But the loss that is produced by the imaginary part of the imaginary part of the effective dielectric constant of super material and equivalent permeability also has a lot of potential application.By the modulation to effective dielectric constant and the equivalent permeability of super material, can make its equiva lent impedance and air impedance coupling, reach the effect of zero reflection, the thickness of underlying metal is greater than electromagnetic skin depth simultaneously, so that be transmitted as zero, realized like this perfection of incident electromagnetic wave is absorbed.This super material has high-absorbable, polarizes insensitive, simple in structure, the advantages such as volume is little, the emission characteristics that can be used for regulating grey body, black matrix also can be used as efficient electromagnetic heater, this external infrared point battle array imaging, the fields such as hot radiation measurement also have huge application potential.
Summary of the invention
The invention provides a kind of super material broadband infrared absorbent structure material, this infrared absorbent structure material is realized the suction wave energy of infrared band wideband high-absorbility based on the super material of three kinds of different rectangular array metal patches.
Technical solution of the present invention is as follows:
A kind of super material broadband infrared absorbent structure material shown in Fig. 1 ~ 3, comprises metal substrate 1, is positioned at the dielectric layer 2 on metal substrate 1 surface and is positioned at the super material 3 on dielectric layer 2 surfaces.The thickness of described metal substrate 1 is greater than the skin depth of infrared band electromagnetic wave in metal substrate 1.The described super material 3 that is positioned at dielectric layer 2 surfaces is formed by unit metamaterial structure periodic arrangement, wherein unit metamaterial structure (as shown in Figure 2) is a square structure that the length of side is a, is formed around a square-shaped metal paster by the rectangular metal paster of two cross direction profiles and the rectangular metal pasters of two vertical distributions.The rectangular metal paster of described cross direction profiles is identical with the rectangular metal patch size that vertically distributes, and length is that L2, width are L3; The described square-shaped metal paster length of side is L1.
The described square shaped cells metamaterial structure of the above-mentioned super material broadband infrared absorbent structure material length of side is a, 4.0 μ m≤a≤5.0 μ m; It is L2,1.70 μ m≤L2≤2.00 μ m that described rectangular metal is pasted length, and width is L3,0.65 μ m≤L3≤0.80 μ m; The described square-shaped metal paster length of side is L1,1.60 μ m≤L1≤1.75 μ m.Described metal substrate (1) and super material (3) material are gold, silver or aluminium.Described dielectric layer (2) material is Al
2O
3
Super material broadband infrared absorbent structure material provided by the invention, when infrared band electromagnetic wave vertical incidence, electric resonance occurs with the super material 3 in surface respectively in the electric field of incident electromagnetic wave, and magnetic resonance occurs between the magnetic field of incident electromagnetic wave and the two metal layers, produce opposite co-current, thereby cause resonance response.The size of three kinds of rectangular array structures of reasonable design can obtain the high-efficient wide-frequency assimilation effect so that electric resonance and magnetic resonance at three characteristic frequency point places electromagnetic resonance occur simultaneously.
The present invention has following effect:
1, by the design of three kinds of rectangular metal pasters, makes it at three characteristic frequency point places electromagnetic resonance occur simultaneously, thereby obtain the infrared band electro-magnetic wave absorption effect of high-efficient wide-frequency;
2, the present invention has simple in structure, thin thickness, characteristics that volume is light, can be mounted on the target object surface, the infrared camouflage of realize target object;
3, can control absworption peak position and intensity by the adjustment to the metal patch array structure of super material 3, to satisfy infrared band different frequency scope to the absorption requirement of electromagnetic infrared wave;
4, the present invention has the characteristics such as polarization is insensitive, incident angle is large.
To sum up, the present invention has the wideband high-absorbable, insensitive, simple in structure, the advantage such as volume is little polarizes, can be used for regulating the emission characteristics of grey body, black matrix, also can be used as efficient electromagnetic heater, this external infrared point battle array imaging, the fields such as infrared camouflage and hot radiation measurement have application potential.
Description of drawings
Fig. 1 is the cross-sectional view of super material broadband infrared absorbent structure material provided by the invention.Wherein 1 is metal substrate, the 2nd, dielectric layer, the 3rd, metamaterial structure.
Fig. 2 is super material cell structural representation in the super material broadband infrared absorbent structure material provided by the invention.
Metamaterial structure schematic diagram in Fig. 3 super material broadband infrared absorbent structure material provided by the invention.
Reflectivity and the absorbance curves of Fig. 4 super material broadband infrared absorbent structure material MA-1 provided by the invention.
Reflectivity and the absorbance curves of Fig. 5 super material broadband infrared absorbent structure material MA-2 provided by the invention.
Reflectivity and the absorbance curves of Fig. 6 super material broadband infrared absorbent structure material MA-3 provided by the invention.
Embodiment
Embodiment one:
Adopt the super material broadband infrared absorbent structure material MA-1 of electron-beam evaporation and contact ultraviolet exposure technique preparation, the metal film of the continuous 100nm of electron-beam evaporation one deck (metal substrate 1) successively on the Si substrate, the 220nm dielectric layer Al that one deck is continuous
2O
3(dielectric layer 2) deposits the patterned metal film of one deck 100nm (metamaterial structure 3) at last.Wherein, metamaterial structure 3 periodic unit size a=4.7 μ m, three kinds of rectangular array sizes are respectively L1=1.65 μ m, L2=2 μ m, L3=0.7 μ m.Its reflectivity curve and absorption curve are as shown in Figure 4, as can be seen from Figure 4, obtain 99.9%, 99.7%, 99.3% absworption peak at 5.5 μ m, 6.1 μ m, 7.1 μ m respectively, obtained a wideband absorption curve, but at 5.8 μ m, 6.6 μ m concave point appears absorbing, absorb relatively poorly, be respectively 78%, 52.5%.
Embodiment two:
Adopt the super material broadband infrared absorbent structure material MA-2 of electron-beam evaporation and contact ultraviolet exposure technique preparation, the metal film of the continuous 100nm of electron-beam evaporation one deck (metal substrate 1) successively on the Si substrate, the 220nm dielectric layer Al that one deck is continuous
2O
3(dielectric layer 2) deposits the patterned metal film of one deck 100nm (metamaterial structure 3) at last.Wherein, metamaterial structure 3 periodic unit size a=4.3 μ m, three kinds of rectangular array sizes are respectively L1=1.7 μ m, L2=1.8 μ m, L3=0.75 μ m.Its reflectivity curve and absorption curve as shown in Figure 5, as can be seen from Figure 5, in 5.6-6.8 μ m scope, the absorptivity of this infrared absorbent structure material obtains 95%, 93%, 93 at 5.7 μ m, 6.2 μ m, 6.6 μ m respectively simultaneously all more than 80%.5% absworption peak occurs absorbing concave point at 6.0 μ m, 6.4 μ m, and absorptivity is respectively 80%, 89.6%.Obtained a preferably wideband absorption curve.
Embodiment three:
Adopt the super material broadband infrared absorbent structure material MA-3 of electron-beam evaporation and contact ultraviolet exposure technique preparation, the metal film of the continuous 100nm of electron-beam evaporation one deck (metal substrate 1) successively on the Si substrate, the 220nm dielectric layer Al that one deck is continuous
2O
3(dielectric layer 2) deposits the patterned metal film of one deck 100nm (metamaterial structure 3) at last.Wherein, metamaterial structure 3 periodic unit size a=4.5 μ m, three kinds of rectangular array sizes are respectively L1=1.65 μ m, L2=1.8 μ m, L3=0.75 μ m.Its reflectivity curve and absorption curve are as shown in Figure 6, as can be seen from Figure 6, in 5.6-6.7 μ m scope, the absorptivity of this infrared absorbent structure material is all more than 90%, obtain 97.8%, 99.4%, 98.9% absworption peak at 5.7 μ m, 6.1 μ m, 6.5 μ m respectively simultaneously, obtain a good wideband absorption curve, realized infrared suction ripple device in a kind of good super material wideband.
In sum, utilize electromagnetic resonance principle among the present invention, adopt the meta-material absorber of three kinds of different rectangular array paster structure designs to show the high-efficient wide-frequency absorbent properties.
Claims (4)
1. a super material broadband infrared absorbent structure material comprises metal substrate (1), is positioned at the dielectric layer (2) on metal substrate (1) surface and is positioned at the surperficial super material (3) of dielectric layer (2); The thickness of described metal substrate (1) is greater than the skin depth of infrared band electromagnetic wave in metal substrate (1); The described super material (3) that is positioned at dielectric layer (2) surface is formed by unit metamaterial structure periodic arrangement, wherein the unit metamaterial structure is shaped as square, is formed around a square-shaped metal paster by the rectangular metal paster of two cross direction profiles and the rectangular metal pasters of two vertical distributions; The rectangular metal paster of described cross direction profiles is identical with the rectangular metal patch size that vertically distributes.
2. super material broadband infrared absorbent structure material according to claim 1 is characterized in that, the described square shaped cells metamaterial structure length of side is a, 4.0 μ m≤a≤5.0 μ m; It is L2,1.70 μ m≤L2≤2.00 μ m that described rectangular metal is pasted length, and width is L3,0.65 μ m≤L3≤0.80 μ m; The described square-shaped metal paster length of side is L1,1.60 μ m≤L1≤1.75 μ m.
3. super material broadband infrared absorbent structure material according to claim 1 is characterized in that, described metal substrate (1) and super material (3) material are gold, silver or aluminium.
4. super material broadband infrared absorbent structure material according to claim 1 is characterized in that, described dielectric layer (2) material is Al
2O
3
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