CN104661504A - Electromagnetic wave absorption method adopting coherent modulation by utilizing conductive patch - Google Patents
Electromagnetic wave absorption method adopting coherent modulation by utilizing conductive patch Download PDFInfo
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- CN104661504A CN104661504A CN201510073141.0A CN201510073141A CN104661504A CN 104661504 A CN104661504 A CN 104661504A CN 201510073141 A CN201510073141 A CN 201510073141A CN 104661504 A CN104661504 A CN 104661504A
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Abstract
The invention relates to an electromagnetic wave absorption method adopting coherent modulation by utilizing a conductive patch. According to the electromagnetic wave absorption method, inherent Drude dispersive dynamic conductance of the conductive patch is utilized, and two electromagnetic wave beams which are transmitted in opposite directions are used in an assisted manner to perform phase modulation to realize high-efficiency (100%) absorption on electromagnetic waves; in order to achieve the purpose, the conductive patch with Drude dispersion is adopted, to be specific, the conduction patch has the surface conduction in a mode that sigma is equal to alpha/(gamma-iomega), wherein omega is the electromagnetic wave angular frequency, alpha and gamma are respectively the Drude factor and the loss coefficient. The two electromagnetic wave beams which are transmitted in opposite directions are incident into the conductive patch from the two sides, the two wave beams are introduced to realize relative phase modulation, that is, at the working frequency at which the transmission coefficient is identical to the reflection coefficient, with the utilization of optical coherence, restraint on the electromagnetic wave scattered field can be realized, and the electromagnetic waves can only be fully absorbed in absorption channels of the conductive patch.
Description
Technical field
The invention belongs to method for electromagnetic wave absorption, particularly relate to a kind of method for electromagnetic wave absorption utilizing conductor patch to adopt coherent modulation,
Background technology
Electro-magnetic wave absorption device be a kind of can the device of selective absorbing electromagnetic wave pole, for regulating and controlling one of elemental device of electromagnetic radiation.All have broad application prospects in fields such as electromagnetic isolation, protection and radar detections.At present both at home and abroad relevant research mainly concentrates on several aspect: (1) by some magnetic materials as iron oxide, material with carbon elements etc. sinter absorption [the document 1-2 of block realization to radar wave into, X.Guo, Y.Deng, D.Gu, R.Che, and D.Zhao, " Synthesisand microwave absorption of uniform hematite nanoparticles and their core-shellmesoporous silica nanocomposites; " Journal of Materials Chemistry 19,6706-6712 (2009); H.Wu, L.Wang, S.Guo, Y.Wang, and Z.Shen, " Electromagnetic and microwave-absorbingproperties of highly ordered mesoporous carbon supported by gold nanoparticles, " MaterialsChemistry and Physics 133,965-970 (2012)]; (2) in resin base material, absorbent is mixed into as absorption [document 3, Chen Xiangbao, the Zhang Baoyan of the realizations such as iron oxygen magnetic and carbon dust to electromagnetic radiation, Xing Liying, " Advanced Resin-based Composites development and application present situation, " Chinese material progress 28,2-12 (2006)]; (3) concept of some research and utilization artificial micro-structure or relevant control is also had to realize good electro-magnetic wave absorption [with Publication about Document 4-10 in conjunction with the absorption of base material in addition, N.I.Landy, S.Sajuyigbe, J.J.Mock, D.R.Smith, and W.J.Padilla, " Perfectmetamaterial absorber; " Physical Review Letters 100,207402 (2008); Y.Zou, L.Jiang, S.Wen, W.Shu, Y.Qing, Z.Tang, H.Luo, and D.Fan, " Enhancing and tuning absorptionproperties of microwave absorbing materials using metamaterials; " Applied Physics Letters93,261115 (2008); J.Hao, J.Wang, X.Liu, W.J.Padilla, L.Zhou, and M.Qiu, " Highperformance optical absorber based on a plasmonic metamaterial, " Applied Physics Letters96,251104 (2010); Y.Q.Ye, Y.Jin, and S.He, " Omnidirectional; polarization-insensitiveand broadband thin absorber in the terahertz regime; " Journal of the Optical Society ofAmerica B 27,498-504 (2010); S.Chen, H.Cheng, H.Yang, J.Li, X.Duan, C.Gu, and J.Tian, " Polarization insensitive and omnidirectional broadband near perfect planarmetamaterial absorber in the near infrared regime, " Applied Physics Letters 99,253104 (2011); W.Wan, Y.Chong, L.Ge, H.Noh, A.D.Stone, and H.Cao, " Time-Reversed Lasingand Interferometric Control of Absorption, " Science 331,889-892 (2011); J.Zhang, K.F.MacDonald, and N.I.Zheludev, " Controlling light-with-light without nonlinearity, " Light:Science & Applications 1, e18 (2012)].Existing design is physically all based on Bragg resonance or local resonance above, especially artificial micro-structure is utilized to realize the work (document 4-10) of electro-magnetic wave absorption, only there is good absorption at resonance frequency place, off-resonance frequency absorption decrease in efficiency is obvious, operating frequency is felt fixed by sample size and is not had adjustability, is applied to the isolation of dynamic change electromagnetic environment and protects the basic restriction that need solve operating frequency dynamic adjustments.
Summary of the invention
The technical problem solved
In order to avoid the deficiencies in the prior art part, the present invention proposes a kind of method for electromagnetic wave absorption utilizing conductor patch to adopt coherent modulation, solves the problem that existing electromagnetic absorption device operating frequency is difficult to regulate.
Technical scheme
Utilize conductor patch to adopt a method for electromagnetic wave absorption for coherent modulation, it is characterized in that step is as follows:
Step 1: same electromagnetic wave is carried out beam splitting and form two bundle amplitude same electrical magnetic waves, two restraint the electromagnetic beam propagated in opposite directions incides conductor patch from both sides, and described two bundle electromagnetic waves are equal with the angle theta of conductor patch normal z; Described conductor patch has the surperficial dynamic conductivity of Drude dispersion;
Step 2: the distance adjusting wherein a branch of electromagnetic wave and conductor patch, two bundle electromagnetic waves are occurred, and initial phase difference Δ φ produces relative phase modulation in conductor patch; Test scattered wave meets the electromagnetic scattering strength O of conductor patch both sides, amplitude equal coherent condition frequency place, initial phase difference Δ φ when scattering strength is 0 is the phase-modulation parameter realizing suppressing completely electromagnetic scattering, now electromagnetic scattering is totally constrained, and is absorbed completely by conductor patch.
When the absorbed electromagnetic wave of needs is microwave band, the conductor patch of described Drude dispersion adopts metal film or the conductive rubber with periodic structure.
When the absorbed electromagnetic wave of needs is Terahertz far infrared band, the conductor patch of described Drude dispersion adopts bidimensional stratified material.
Described bidimensional stratified material is Graphene, MoS
2or Bi
2se
3.
When the absorbed electromagnetic wave of needs be near-infrared and visible light wave range time, the conductor patch of described Drude dispersion adopts the metallic film of gold that nanoscale is thick or silver.
Beneficial effect
A kind of method for electromagnetic wave absorption utilizing conductor patch to adopt coherent modulation that the present invention proposes, the Drude dispersion dynamic conductivity utilizing conductor patch intrinsic, be aided with to two in opposite directions propagation of electromagnetic waves Shu Jinhang phase-modulation realize electromagnetic high efficiency (100%) is absorbed: in order to reach appeal object, originally the conductor patch adopting and there is Drude dispersion is delivered, namely surface conductance has the form of σ=α/(γ-i ω), wherein ω is electromagnetic wave angular frequency, α and γ is respectively Drude Summing Factor loss factor.The identical electromagnetic beam propagated in opposite directions of two amplitudes incides conductor patch from both sides, two wave beams introduce relative phase modulation, can in the transmission coefficient frequency identical with reflection coefficient, i.e. operating frequency place, utilize optical coherence, realize the suppression to electromagnetic scattering field, and electromagnetic wave all can only be absorbed in the absorbing path of conductor patch.
The present invention has following effect and advantage:
1. by changing material microstructure, to realize influx and translocation different from traditional electromagnetic wave absorb, and this invention utilizes to be carried out phase-modulation to incident coherent electromagnetic wave beam and realize the suppression of scattering and then realize high efficiency in conductor patch (100%) electro-magnetic wave absorption.
2. the present invention adopt conductor patch far infrared band can adopt bidimensional stratified material (as Graphene, MoS
2, Bi
2se
3deng) realize, the dynamic conductivity of these materials has good adjustability, very helpful with protection for the electromagnetic isolation in dynamic electric magnetic environment.
3. the present invention utilizes conductor patch itself to design, and does not need to carry out micro Process process, realizes simple.
Accompanying drawing explanation
Fig. 1 is the structural representation of coherent modulation conductor patch t of the present invention;
Fig. 2 is the transmittance and reflectance coefficient of coherent modulation conductor patch t example 1 of the present invention;
Fig. 3 is the adjustment curve (the relevant change that absorb with phase-modulation) of coherent modulation conductor patch t example 1 of the present invention at operating frequency 9.19GHz;
Fig. 4 is coherent modulation conductor patch t example 1 operating frequency of the present invention with the change curve of polarization of ele and incident angle;
Fig. 5 is the transmittance and reflectance coefficient of coherent modulation conductor patch t example 2 of the present invention;
Fig. 6 is the adjustment curve (the relevant change that absorb with phase-modulation) of coherent modulation conductor patch t example 2 of the present invention at operating frequency 2.38THz;
Fig. 7 is the change curve of coherent modulation conductor patch t example 2 operating frequency of the present invention with the Drude factor.
Embodiment
Now in conjunction with the embodiments, the invention will be further described for accompanying drawing:
Specific implementation of the present invention is as accompanying drawing 1: comprise the conductor patch 1 that one deck has Drude dispersion, and the electromagnetic beam I that two propagate in opposite directions.The aufbauprinciple realizing electromagnetic wave 100% absorption based on Drude dispersion conductor patch coherent modulation that the present invention announces, can be useful in microwave, Terahertz, also infrared or visible light wave range.The conductor patch being embodied in concrete Drude dispersion can be achieved at each wave band respectively: microwave band can adopt there is periodic structure metal film, conductive rubber realize; Terahertz far infrared band can utilize bidimensional stratified material (as Graphene, MoS
2, Bi
2se
3deng); Can realize by the ultra-thin metallic film (gold, silver that nanoscale is thick) of material at near-infrared and visible light wave range.The two same frequency electromagnetic beams propagated in opposite directions incide from both sides conductor patch as shown in Figure 1 (be θ with the angle of conductor patch normal z and incidence angle), coherent modulation is realized by the initial phase difference Δ φ changing two wave beams shown in accompanying drawing 1, by the test electromagnetic scattering strength O in the left and right sides, scattering strength is 0 suppression completely namely realizing to electromagnetic scattering, and wave frequency at this moment and phase-modulation value and device realize the suitable parameters of 100% electro-magnetic wave absorption.Can the operating frequency of adjusting device by the dynamic conductivity changing polarization of electromagnetic wave and incident angle or conductor patch.
The Drude dispersion dynamic conductivity utilizing conductor patch intrinsic, be aided with to two in opposite directions propagation of electromagnetic waves Shu Jinhang phase-modulation realize electromagnetic high efficiency (100%) is absorbed: in order to reach appeal object, originally the conductor patch adopting and there is Drude dispersion is delivered, namely surface conductance has the form of σ=α/(γ-i ω), wherein ω is electromagnetic wave angular frequency, α and γ is respectively Drude Summing Factor loss factor.The identical electromagnetic beam propagated in opposite directions of two amplitudes incides conductor patch from both sides, two wave beams introduce relative phase modulation, can in the transmission coefficient frequency identical with reflection coefficient, i.e. operating frequency place, utilize optical coherence, realize the suppression to electromagnetic scattering field, and electromagnetic wave all can only be absorbed in the absorbing path of conductor patch.
Specific embodiment 1
Accompanying drawings 1, accompanying drawing 2, accompanying drawing 3 and accompanying drawing 4.
By two bundle coherent electromagnetic wave, from both sides, incident conductor patch is formed, and is given in microwave wavelength regions and calculation in absorption result, can be realized [see document 11 in microwave band conductor patch by the metallic film of cycle square hole, Z.Wei, Y.Cao, Z.Gong, X.Su, Y.Fan, C.Wu, J.Zhang, and H.Li, " Subwavelength imaging with a fishnetflat lens, " Physical Review B 88,195123 (2013)].Get metallic aluminium film, if structural cycle is 6 millimeters × 6 millimeters, square hole size is 5.8 millimeters × 5.8 millimeters, extracts its Drude parameter be respectively α=299.3MHz/ Ω and γ=65MHz by equivalent parameters.The transmission coefficient of this metallic film and reflection coefficient are as shown in Figure 2, can see at 9.32GHz transmission coefficient equal with reflection coefficient, the amplitude that the incident electromagnetic wave that such amplitude is identical meets optical coherence condition at the scattered wave of the conductor patch left and right sides is equal, in conjunction with the phase-modulation of incident wave beam, scattered wave can be modulated well, under suitable phase-modulation, it is Δ φ=0.5 π radian (see accompanying drawing 3) in this example, scattered wave is totally constrained, and realizes high efficiency (100%) microwave absorption.The conductor patch device that the present invention relates to is simple, easily change with the relative angle of incident electromagnetic wave, namely can change polarization of electromagnetic wave and incidence angle easily, fig. 4 shows the change with polarization of ele and incident angle of microwave 100% absorption and operating frequency.24.72GHz when 3.07GHz, p polarized wave (electromagnetic vector is along y-axis) operating frequency is elevated to 80 degree of incidence from the 9.32GHz of vertical incidence when being reduced to 80 degree of incidence for p polarized wave (electromagnetic vector is along x-axis) operating frequency from the 9.32GHz of vertical incidence.
Embodiment 2
By two bundle coherent electromagnetic wave, from both sides, incident conductor patch is formed, and is given in the design of far infrared band wave band and calculation in absorption result, far infrared band conductor patch can adopt bidimensional stratified material (as Graphene, MoS
2, Bi
2se
3deng) [see document 12-13, T.Low and P.Avouris, " Graphene Plasmonics for Terahertz toMid-Infrared Applications, " ACS Nano 8,1086-1101 (2014); P.Di Pietro, M.Ortolani, O.Limaj, A.Di Gaspare, V.Giliberti, F.Giorgianni, M.BrahlekM, N.Bansal, N.Koirala, S.Oh, P.Calvani, S.Lupi, " Observation of Dirac plasmons in a topological insulator; " NatureNanotechnology 8,556-560 (2013)], its dynamic conductivity determines in Drude dispersion primarily of intraband transition contribution in this frequency range.We get Drude parameter and are respectively α=80.0GHz/ Ω and γ=2.0THz.The transmission coefficient of this conductor patch and reflection coefficient are as shown in Figure 5, can see at 2.38THz transmission coefficient equal with reflection coefficient, the amplitude that the incident electromagnetic wave that such amplitude is identical meets optical coherence condition at the scattered wave of the conductor patch left and right sides is equal, in conjunction with the phase-modulation of incident wave beam, scattered wave can be modulated well, under suitable phase-modulation, it is Δ φ=0.46 π radian (see accompanying drawing 6) in this example, scattered wave is totally constrained, and realizes high efficiency (100%) infrared waves and absorbs.The dynamic conductivity of bidimensional stratified material can be mixed by static electric field, static magnetic field and chemistry and be regulated, here our fixed loss coefficient gamma=2.0THz, change Drude factor-alpha, calculate can realize 100% absorption operating frequency with the change of α, increase to 200.0GHz/ Ω with the Drude factor from 20.0GHz/ Ω as shown in Figure 7, the operating frequency that far infrared wave 100% absorbs from 0.50THz linear broadband be tuned to 5.97THz.
Claims (5)
1. utilize conductor patch to adopt a method for electromagnetic wave absorption for coherent modulation, it is characterized in that step is as follows:
Step 1: same electromagnetic wave is carried out beam splitting and form two bundle amplitude same electrical magnetic waves, two restraint the electromagnetic beam propagated in opposite directions incides conductor patch from both sides, and described two bundle electromagnetic waves are equal with the angle theta of conductor patch normal z; Described conductor patch has the surperficial dynamic conductivity of Drude dispersion;
Step 2: the distance adjusting wherein a branch of electromagnetic wave and conductor patch, two bundle electromagnetic waves are occurred, and initial phase difference Δ φ produces relative phase modulation in conductor patch; Test scattered wave meets the electromagnetic scattering strength O of conductor patch both sides, amplitude equal coherent condition frequency place, initial phase difference Δ φ when scattering strength is 0 is the phase-modulation parameter realizing suppressing completely electromagnetic scattering, now electromagnetic scattering is totally constrained, and is absorbed completely by conductor patch.
2. utilize conductor patch to adopt the method for electromagnetic wave absorption of coherent modulation according to claim 1, it is characterized in that: when the absorbed electromagnetic wave of needs is microwave band, the conductor patch of described Drude dispersion adopts metal film or the conductive rubber with periodic structure.
3. utilize conductor patch to adopt the method for electromagnetic wave absorption of coherent modulation according to claim 1, it is characterized in that: when the absorbed electromagnetic wave of needs is Terahertz far infrared band, the conductor patch of described Drude dispersion adopts bidimensional stratified material.
4. utilize conductor patch to adopt the method for electromagnetic wave absorption of coherent modulation according to claim 3, it is characterized in that: described bidimensional stratified material is Graphene, MoS
2or Bi
2se
3.
5. utilize conductor patch to adopt the method for electromagnetic wave absorption of coherent modulation according to claim 1, it is characterized in that: when the absorbed electromagnetic wave of needs be near-infrared and visible light wave range time, the conductor patch of described Drude dispersion adopts the metallic film of gold that nanoscale is thick or silver.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105958946A (en) * | 2016-04-20 | 2016-09-21 | 西北工业大学 | Triple-frequency microwave modulation method and apparatus based on electrically-regulated electromagnetically-induced transparency like effect |
| CN110164999A (en) * | 2019-06-05 | 2019-08-23 | 福州大学 | A method of circular polarization photogenerated current flow in regulation selenizing bismuth thin film |
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2015
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| CN101740722A (en) * | 2009-12-25 | 2010-06-16 | 中国科学院光电技术研究所 | Almost perfect absorbing structure for wide wave band |
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| CN103247839A (en) * | 2013-04-02 | 2013-08-14 | 华中科技大学 | Switching-controllable THz wave metamaterial perfect absorber and control method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105958946A (en) * | 2016-04-20 | 2016-09-21 | 西北工业大学 | Triple-frequency microwave modulation method and apparatus based on electrically-regulated electromagnetically-induced transparency like effect |
| CN110164999A (en) * | 2019-06-05 | 2019-08-23 | 福州大学 | A method of circular polarization photogenerated current flow in regulation selenizing bismuth thin film |
| CN110164999B (en) * | 2019-06-05 | 2021-04-27 | 福州大学 | Method for regulating and controlling circularly polarized photoinduced current in bismuth selenide film |
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