CN108279451A - A kind of broadband Meta Materials wave absorbing device that infrared band polarizes insensitive - Google Patents
A kind of broadband Meta Materials wave absorbing device that infrared band polarizes insensitive Download PDFInfo
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- CN108279451A CN108279451A CN201810323456.XA CN201810323456A CN108279451A CN 108279451 A CN108279451 A CN 108279451A CN 201810323456 A CN201810323456 A CN 201810323456A CN 108279451 A CN108279451 A CN 108279451A
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/003—Light absorbing elements
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Abstract
The present invention is to provide the broadband Meta Materials wave absorbing devices that a kind of infrared band polarizes insensitive.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, annulus 32 and annulus 33 form, and the geometric center of annulus 31, the geometric center of annulus 32, the geometric center of annulus 33, 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 invention has high-absorbility, the insensitive and wide waveband characteristics of polarization, has very high engineering application value.
Description
Technical field
The present invention relates to infrared technique fields, and in particular to a kind of broadband Meta Materials wave absorbing device that polarization is insensitive.
Background technology
With the fast development of modern science and technology, it is widely used in satellite communication using electromagnetic wave as medium, radar is visited
Survey, radio broadcasting, thermal imaging system etc..Meanwhile electromagenetic wave radiation also increasingly increases the negative effect of ambient enviroment, such as by
In the presence of electromagnetic wave, communication quality is influenced, interference Instrument works normally, and electromagenetic wave radiation can also influence human body and be good for
Health.Therefore, Contamination of Electromagnetic Wave is administered, electromagnetic wave is shielded, absorbs and becomes more and more important.
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, for example, negative refraction, high refractive index and high-selenium corn etc..Based on the complete of Meta Materials
U.S. wave absorbing device has many advantages, such as that small, thickness is thin, absorption is strong, can be applied to miniature survey radiation gauge, optical detector, thermal imaging,
The fields such as 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 demand of practical application in the electromagnetic wave absorption device of single, double and multiple wavestrips.Therefore, how
The electromagnetic wave absorption device for realizing wide wavestrip, is a problem in urgent need to solve.Meta Materials wave absorbing device proposed by the present invention is 2.28
90% high-absorbility is realized in~6.57 microns, but also with the insensitive characteristic that polarizes, therefore there is very high engineering
Application value.
Invention content
It is super the purpose of the invention is to provide a kind of broadband with the insensitive characteristic that polarizes working in infrared band
Material 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, annulus 32 and annulus 33 form, the geometric center of annulus 31, the geometric center of annulus 32,
The geometric center of the geometric center of annulus 33, the geometric center of intermediate lossy medium layer 2 and underlying metal film 1 is straight at one
On line.
Preferably, the cross section of each wave absorbing device unit is square, its side length is 1.5~1.8 microns.
Preferably, underlying metal film 1, annulus 31, annulus 32 and annulus 33 thickness be 0.2~0.4 micron, by
Chromium is made.
Preferably, the outer radius r1 and inside radius r2 of annulus 31 are respectively 0.25 micron and 0.22 micron.
Preferably, the outer radius r3 and inside radius r4 of annulus 32 are respectively 0.38 micron and 0.35 micron.
Preferably, the outer radius r5 and inside radius r6 of annulus 33 are respectively 0.55 micron and 0.52 micron.
Preferably, middle dielectric layer 2 is silica, thickness t is 0.41~0.49 micron.
Compared with prior art, the present invention its remarkable advantage is：
1. the top layer of Meta Materials wave absorbing device is formed using three 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 wide band absorption in 2.28~6.57 wave-length coverages, inhale
Yield is not less than 90%；
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：Absorption spectrogram of the present invention under different structure unit.
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 the geometric center of the geometric center of ring 31, the geometric center of annulus 32 and annulus 33 and intermediate lossy medium 2 with
And the geometric center of underlying metal film 1 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 (31,32 and 33), so that each suction wave unit is worked independently.
Shown intermediate medium is lossless silica, refractive index 1.475.
Underlying metal film 1 and metal ring (31,32 and 33) are all made of chromium.
As embodiment, each each dimensional parameters of three-decker for inhaling wave unit are as follows：P=1.6 microns of lattice period, three
The interior outer radius of a metal ring is respectively r1=0.25 microns, and r2=0.22 microns, r3=0.38 microns, r4=0.35 is micro-
Rice, r5=0.55 microns, r6=0.52 microns, t=0.45 microns of interlayer dielectric thickness, the crome metal film thickness of top layer and bottom
Degree is dh=0.2 microns.
The absorptivity of broadband Meta Materials wave absorbing device described in the present embodiment is defined as A=1-R-T, and R is reflectivity, T in formula
For transmissivity.In order to make absorptivity maximize, it is desirable that small as far as possible in entire wave-length coverage internal reflection rate and transmissivity.This hair
The bottom of the suction wave unit of bright design is all-metal film 1, and electromagnetic wave cannot transmit, and transmissivity levels off to zero, therefore absorptiometer
A=1-R can be reduced to by calculating formula.
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 in 2.28~6.57 wave-length coverages, absorptivity is not less than 90%.This
Illustrate that wave absorbing device proposed by the present invention has reached high-selenium corn in above-mentioned wave-length coverage.
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 normal incident absorption coefficient simulation result diagram under different structure unit is as shown in Figure 6.It can be with from figure
Find out under different structure cell cases, which still may be implemented broadband high-selenium corn.This illustrates suction proposed by the present invention
The structural unit of multiple sizes can be selected in wave device.
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 (7)
1. the broadband Meta Materials wave absorbing device that a kind of infrared band polarizes insensitive, it is characterised in that：The Meta Materials wave absorbing device is by more
A wave absorbing device unit is constituted, and wave absorbing device unit is by the underlying metal film 1 set gradually from bottom to top, intermediate lossy medium layer 2
It forms with top-level metallic film, is bonded to each other between underlying metal film 1, intermediate lossy medium layer 2 and top-level metallic film.Institute
It is all-metal film to state underlying metal film 1, and top-level metallic film is that annulus 31, annulus 32 and annulus 33 form, annulus 31
Geometric center, the geometric center of annulus 32, the geometric center of annulus 33, the geometric center of intermediate lossy medium layer 2 and bottom
The geometric center of metallic film 1 is point-blank.
2. the broadband Meta Materials wave absorbing device that a kind of infrared band according to claim 1 polarizes insensitive, it is characterised in that：
The cross section of each wave absorbing device unit is square, and length of side P is 1.5~1.8 microns.
3. the broadband Meta Materials wave absorbing device that a kind of infrared band according to claim 1 polarizes insensitive, it is characterised in that：
The underlying metal film 1, annulus 31, annulus 32 and annulus 33 thickness be 0.2~0.4 micron, be made of chromium.
4. the broadband Meta Materials wave absorbing device that a kind of infrared band according to claim 1 and 3 polarizes insensitive, feature exist
In：The outer radius r1 and inside radius r2 of the annulus 31 are respectively 0.25 micron and 0.22 micron.
5. the broadband Meta Materials wave absorbing device that a kind of infrared band according to claim 1 and 3 polarizes insensitive, feature exist
In：The outer radius r3 and inside radius r4 of the annulus 32 are respectively 0.38 micron and 0.35 micron.
6. the broadband Meta Materials wave absorbing device that a kind of infrared band according to claim 1 and 3 polarizes insensitive, feature exist
In：The outer radius r5 and inside radius r6 of the annulus 33 are respectively 0.55 micron and 0.52 micron.
7. the broadband Meta Materials wave absorbing device that a kind of infrared band according to claim 1 polarizes insensitive, it is characterised in that：
Middle dielectric layer 2 is silica, and thickness t is 0.41~0.49 micron.
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| CN201810323456.XA CN108279451A (en) | 2018-04-06 | 2018-04-06 | A kind of broadband Meta Materials wave absorbing device that infrared band polarizes insensitive |
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| CN201810323456.XA CN108279451A (en) | 2018-04-06 | 2018-04-06 | A kind of broadband Meta Materials wave absorbing device that infrared band polarizes insensitive |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109683219A (en) * | 2019-03-05 | 2019-04-26 | 南华大学 | Surface plasma optical filter based on periodical sub-wavelength annulus hole array |
| CN109786973A (en) * | 2019-01-31 | 2019-05-21 | 浙江师范大学 | A kind of chirality microwave absorption Meta Materials and its preparation and application |
| CN113311520A (en) * | 2020-02-26 | 2021-08-27 | 中移(上海)信息通信科技有限公司 | Visible light-near infrared wave band light wave absorber and manufacturing method thereof |
| CN113363728A (en) * | 2021-05-17 | 2021-09-07 | 海宁利伊电子科技有限公司 | Miniaturized ultra-wideband metamaterial wave absorber structure for inhibiting electromagnetic radiation and application |
| CN114784516A (en) * | 2022-04-27 | 2022-07-22 | 中国人民解放军国防科技大学 | Metamaterial-based four-frequency-band terahertz absorber implementation method |
-
2018
- 2018-04-06 CN CN201810323456.XA patent/CN108279451A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109786973A (en) * | 2019-01-31 | 2019-05-21 | 浙江师范大学 | A kind of chirality microwave absorption Meta Materials and its preparation and application |
| CN109683219A (en) * | 2019-03-05 | 2019-04-26 | 南华大学 | Surface plasma optical filter based on periodical sub-wavelength annulus hole array |
| CN113311520A (en) * | 2020-02-26 | 2021-08-27 | 中移(上海)信息通信科技有限公司 | Visible light-near infrared wave band light wave absorber and manufacturing method thereof |
| CN113363728A (en) * | 2021-05-17 | 2021-09-07 | 海宁利伊电子科技有限公司 | Miniaturized ultra-wideband metamaterial wave absorber structure for inhibiting electromagnetic radiation and application |
| CN114784516A (en) * | 2022-04-27 | 2022-07-22 | 中国人民解放军国防科技大学 | Metamaterial-based four-frequency-band terahertz absorber implementation method |
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Application publication date: 20180713 |