CN207947383U - A kind of terahertz wave band polarizes five insensitive frequency band Meta Materials wave absorbing devices - Google Patents
A kind of terahertz wave band polarizes five insensitive frequency band Meta Materials wave absorbing devices Download PDFInfo
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- CN207947383U CN207947383U CN201721777276.6U CN201721777276U CN207947383U CN 207947383 U CN207947383 U CN 207947383U CN 201721777276 U CN201721777276 U CN 201721777276U CN 207947383 U CN207947383 U CN 207947383U
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Abstract
Provided by the utility model is that a kind of terahertz wave band polarizes five insensitive frequency band Meta Materials wave absorbing devices.The Meta Materials wave absorbing device is made of multiple wave absorbing device units, wave absorbing device unit is by the underlying metal film 1 that sets gradually from bottom to top, intermediate lossy medium layer 2 and top-level metallic film composition are bonded to each other between underlying metal film 1, intermediate lossy medium layer 2 and top-level metallic film.The underlying metal film 1 is all-metal film, top-level metallic film is that annulus 31 and annulus 32 form, and the geometric center of annulus 31, the geometric center of annulus 32, the geometric center of the geometric center of intermediate lossy medium layer 2 and underlying metal film 1 are point-blank.Meta Materials wave absorbing device provided by the utility model has high-absorbility, the insensitive characteristic of polarization, and there are five absorption peak points, have very high engineering application value.
Description
Technical field
The present invention relates to Terahertz Technology fields, and in particular to a kind of five frequency band Meta Materials wave absorbing devices that polarization is insensitive.
Background technology
The tactical level of military equipment is improved to avoid weaponry from being found and attacked by enemy in national defense and military fields,
Radar stealth technology also becomes to become more and more important, and is paid much attention to by countries in the world.It is the key that radar stealth technology to inhale wave, but
There are the disadvantages such as bulky, heavy, performance is low for traditional absorbing material, are above very restricted in application.
Meta Materials are a kind of to arrange constituted artificial material according to certain rule by sub-wavelength micro structure unit.Due to micro-
The size of structural unit is much smaller than operation wavelength, therefore is a kind of uniform material of performance for operation wavelength.Super material
The advantages of material is can be by adjusting geometry, size and the distribution form of microstructure unit come the electricity of arbitrary control material
Magnetic attribute, to obtain the characteristic of a variety of novelties.Meta Materials are a kind of artificial structure's materials with extraordinary electromagnetic property, can be with
Realize negative index, super lens and high-selenium corn etc..Perfect wave absorbing device based on Meta Materials has thin thickness, light weight, absorption
The advantages that strong, can be applied to the fields such as miniature survey radiation gauge, optical detector, spectral imaging, electromagnetism stealth.
Currently, a variety of Meta Materials wave absorbing device structures, but the work frequency of these wave absorbing device structures has been proposed in researcher
Section primary limitation has been unable to meet the requirement of system rejection to disturbance in the electromagnetic wave absorption device of single and double frequency band.Therefore, how real
The electromagnetic wave absorption device of existing multiple frequency bands, enhances the anti-interference to system, is a problem in urgent need to solve.The present invention proposes
Meta Materials wave absorbing device realize the perfect of much five frequency bands in 0.5~3.9THz and absorb, but also it is unwise with polarizing
Feel characteristic, therefore there is very high engineering application value.
Invention content
The purpose of the invention is to provide a kind of five frequencies with the insensitive characteristic that polarizes working in terahertz wave band
Band Meta Materials wave absorbing device.
The object of the present invention is achieved like this：The Meta Materials wave absorbing device is made of multiple wave absorbing device units, wave absorbing device list
For member by the underlying metal film 1 set gradually from bottom to top, intermediate lossy medium layer 2 and top-level metallic film composition, bottom are golden
Belong to and being bonded to each other between film 1, intermediate lossy medium layer 2 and top-level metallic film.The underlying metal film 1 is that all-metal is thin
Film, top-level metallic film are that annulus 31 and annulus 32 form, the geometric center of annulus 31, the geometric center of annulus 32, intermediate damage
The geometric center of the geometric center and underlying metal film 1 that consume dielectric layer 2 is point-blank.
Preferably, the cross section of each wave absorbing device unit is square, its side length is 80~85 microns.
Preferably, the thickness d h of underlying metal film 1 and unsymmetrical metal splitting ring 3 is 0.2~1 micron, it can be by
One kind in gold, silver, copper, aluminium or lead is made.
Preferably, the outer radius r1 and inside radius r2 of annulus 31 are respectively 32 microns and 26 microns.
Preferably, the outer radius r3 and inside radius r4 of annulus 32 are respectively 18 microns and 12 microns.
Preferably, middle dielectric layer 2 is polyimides (PI) film, thickness t is 17~18 microns, and refractive index is
1.8, extinction coefficient 0.06.
Compared with prior art, the present invention its remarkable advantage is：
1. the top layer of Meta Materials wave absorbing device is formed using two concentric metal annulus, simple in structure, compact, ideal symmetrical,
It is easily achieved, can also make wave absorbing device that there is the insensitive characteristic that polarizes；
2. Meta Materials wave absorbing device proposed by the present invention can realize five absorptions in the frequency range of 0.5~3.9THz
Peak, and all absorption average absorptions with almost Perfect；
3. Meta Materials wave absorbing device structure material therefor proposed by the present invention is all conventional material, it is easy to accomplish.
Description of the drawings
Fig. 1：The three dimensional structure diagram of the present invention.
Fig. 2：The front view of Fig. 1.
Fig. 3：The upward view of Fig. 1.
Fig. 4：The present invention is to normal incident absorption coefficient simulation result diagram.
Fig. 5：Absorption spectrogram of the present invention under different polarisation angles.
Fig. 6：The present invention is in different metal normal incident absorption coefficient simulation result diagram.
Specific implementation mode
Present invention is further described in detail with specific implementation mode below in conjunction with the accompanying drawings.
As shown in Figure 1, 2, 3, five frequency bands Meta Materials wave absorbing device proposed by the present invention, include continuously be arranged along plane it is multiple
Inhale wave unit.Underlying metal film 1, intermediate lossy medium layer 2 and the top layer that the suction wave unit is from bottom to top set gradually
Metallic film forms.It is mutually fitted closely between underlying metal film 1, intermediate lossy medium layer 2 and top-level metallic film, namely
The underlying metal film 1 and top-level metallic film of the present invention adhere well to the both sides of intermediate lossy medium layer 2 respectively.It is described
Underlying metal film 1 be all-metal film, no engraved structure, top-level metallic film is made of two concentric metal annulus.Circle
The geometric center of ring 31, the geometric center of the geometric center of annulus 32 and intermediate lossy medium 2 and underlying metal film 1 it is several
What center is point-blank.
When multiple suction wave units are continuously arranged along plane, underlying metal film 1 and intermediate lossy medium 2 are linked as one
Body, and it is then mutually isolated between metal ring (31 and 32), so that each suction wave unit is worked independently.
Shown intermediate medium is lossy polyimides (PI) film, refractive index 1.8, extinction coefficient 0.06.
Underlying metal film 1 and metal ring (31 and 32) are the same as using one kind in silver, copper, gold or aluminium, conductivity point
It is not：σSilver=6.1 × 107S/m、σCopper=5.8 × 107S/m、σGold=4.1 × 107S/m and σAluminium=3.8 × 107S/m。
As embodiment, each each dimensional parameters of three-decker for inhaling wave unit are as follows：P=80 microns of lattice period, two
The interior outer radius of a metal ring is respectively r1=32 microns, r2=26 microns, r3=18 microns, r4=12, middle dielectric layer
The copper metal film thickness of t=17 microns of thickness, top layer and bottom is dh=0.5 microns.
The absorptivity of five frequency band Meta Materials wave absorbing devices described in the present embodiment is defined as A=1-R-T, and R is reflectivity in formula,
T is transmissivity.In order to make absorptivity maximize, it is desirable that small as far as possible in entire frequency range internal reflection rate and transmissivity.This
The bottom of the suction wave unit of invention design is all-metal film 1, and electromagnetic wave cannot transmit, and transmissivity levels off to zero, therefore absorptivity
Calculation formula can be reduced to A=1-R.
Simulation result of the present embodiment under electromagnetic wave normal incidence as shown in figure 4, the simulation result by FDTD
Solutions is calculated.From the figure, it can be seen that there are five apparent absorption peaks in 0.5~3.9THz.This five absorptions
Absorptivity of the peak at 0.90THz, 1.83THz, 2.55THz, 2.92THz, 3.71THz is respectively 99.83%, 98.92%,
99.96%, 99.35% and 99.00%, and average absorption ratio is up to 99.41%.This illustrates wave absorbing device proposed by the present invention
The absorption of almost Perfect is reached on five frequency points.
Absorption spectrogram of the present embodiment under different polarisation angles is as shown in Figure 5.The polarisation angles are defined as electric field
The angle of vector and vertical direction, it is constant that electromagnetic wave wave vector still remains perpendicular to wave-absorber absorbing surface.As can be seen from the figure
Wave absorbing device proposed by the present invention absorption response curve having the same under different polarisation angles, this illustrates suction proposed by the present invention
Wave device shows the good insensitive characteristic of polarization.
The present embodiment is as shown in Figure 6 in different metal material normal incident absorption coefficient simulation result diagram.From figure
It can be seen that the absorptivity of each frequency band is hardly influenced by metal material.This illustrates that wave absorbing device proposed by the present invention is optional
With various metals material.
The present invention is illustrated by above-described embodiment, but it is to be understood that, above-described embodiment is only for
Citing and explanation, and be not intended to limit the invention within the scope of described embodiment.In addition those skilled in the art can
With understanding, the invention is not limited in above-described embodiment, introduction according to the present invention can also make more kinds of modifications
And modification, these variants and modifications are all fallen within scope of the present invention.Protection scope of the present invention is by attached
Claims and its equivalent scope defined.
Claims (6)
- The five insensitive frequency band Meta Materials wave absorbing devices 1. a kind of terahertz wave band polarizes, it is characterised in that：The Meta Materials wave absorbing device It is made of multiple wave absorbing device units, wave absorbing device unit is by the underlying metal film 1 set gradually from bottom to top, intermediate lossy medium Layer 2 and top-level metallic film composition mutually paste between underlying metal film 1, intermediate lossy medium layer 2 and top-level metallic film Close, the underlying metal film 1 is all-metal film, and top-level metallic film is that annulus 31 and annulus 32 form, annulus 31 it is several What center, the geometric center of annulus 32, the geometric center of intermediate lossy medium layer 2 and the geometric center of underlying metal film 1 Point-blank.
- The five insensitive frequency band Meta Materials wave absorbing devices 2. a kind of terahertz wave band according to claim 1 polarizes, feature It is：The cross section of each wave absorbing device unit is square, and length of side P is 80~85 microns.
- The five insensitive frequency band Meta Materials wave absorbing devices 3. a kind of terahertz wave band according to claim 1 polarizes, feature It is：The thickness of the underlying metal film 1, annulus 31 and annulus 32 is 0.2~1 micron, by gold, silver, copper or aluminium One kind is made.
- The five insensitive frequency band Meta Materials wave absorbing devices 4. a kind of terahertz wave band according to claim 1 polarizes, feature It is：The outer radius r1 and inside radius r2 of the annulus 31 are respectively 32 microns and 26 microns.
- The five insensitive frequency band Meta Materials wave absorbing devices 5. a kind of terahertz wave band according to claim 1 polarizes, feature It is：The outer radius r3 and inside radius r4 of the annulus 32 are respectively 18 microns and 12 microns.
- The five insensitive frequency band Meta Materials wave absorbing devices 6. a kind of terahertz wave band according to claim 1 polarizes, feature It is：Middle dielectric layer 2 is polyimides (PI) film, and thickness t is 17~18 microns, refractive index 1.8, and extinction coefficient is 0.06。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107919534A (en) * | 2017-12-10 | 2018-04-17 | 安阳师范学院 | Five insensitive frequency band Meta Materials wave absorbing devices of a kind of terahertz wave band polarization |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107919534A (en) * | 2017-12-10 | 2018-04-17 | 安阳师范学院 | Five insensitive frequency band Meta Materials wave absorbing devices of a kind of terahertz wave band polarization |
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