CN103682532B - The electromagnetic wave multi-band wave filter of side microcavity and metal-dielectric-metal waveguide-coupled - Google Patents
The electromagnetic wave multi-band wave filter of side microcavity and metal-dielectric-metal waveguide-coupled Download PDFInfo
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- CN103682532B CN103682532B CN201310680425.7A CN201310680425A CN103682532B CN 103682532 B CN103682532 B CN 103682532B CN 201310680425 A CN201310680425 A CN 201310680425A CN 103682532 B CN103682532 B CN 103682532B
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Abstract
The present invention relates to the electromagnetic wave multi-band wave filter of a kind of side microcavity and metal-dielectric-metal waveguide-coupled, belong to technical field of filter design.The present invention utilizes metal-insulator-metastructure structure, and intermediate medium part is insulative transparent layer, forms waveguide; Metallic member makes many group sides microcavity, often organizes the corresponding rectangular transmission stopband of side microcavity.Especially because gold is very little in the loss of terahertz wave band, can be considered perfect electric conductor; The bandwidth of wave filter can be adjusted by the width adjusting microcavity; The multi-band filtering of terahertz wave band can be realized.There is bandwidth, advantage that stopband number is adjustable; Be convenient to miniaturization and integrated; Also can be applied to other electromagnetic wave frequency range, such as optical-fibre communications frequency range, microwave region etc., meet different-waveband demand.
Description
Technical field
The present invention relates to the electromagnetic wave multi-band wave filter of a kind of side microcavity and metal-dielectric-metal waveguide-coupled, belong to technical field of filter design.
Background technology
Terahertz emission is the electromagnetic radiation of frequency at 0.1 ~ 10THz, has penetration capacity strong, the advantages such as photon energy is low, and frequency spectrum is wide, makes it have potential application in the field such as nondestructive examination, radio communication of safety inspection, material and structure.The transmission of THz wave is an important component part in THz wave communication systems, and in a communications system, wave filter is then pith.At present, the terahertz filter structure of research both at home and abroad mainly contains following several: (1) is based on the terahertz filter of Meta Materials; (2) based on the terahertz filter of 1-D photon crystal structure; (3) based on the terahertz filter of two-dimensional medium photonic crystal.Due to these terahertz filter complex structures, be difficult to widespread use.Therefore, it is vital for pursuing the terahertz filter that a kind of structure is simple, size is small.In current material, High Resistivity Si, high density polyethylene, high conductivity metal (gold, silver, copper) are negligible to the electromagnetic absorption loss of terahertz wave band.Therefore utilizing these design of materials to go out terahertz filter is the key technical problem being badly in need of in Terahertz application system solving.
In addition, along with the development of Fibre Optical Communication Technology, optical filter product is applied on a large scale.It may be used for wavelength chooses, the noise filtering of image intensifer, gain balance, recovery with and demultiplexing etc.Common communication band wave filter has following two classes: (1) based on the wave filter of principle of interference, as Fabry-Perot wave filter, multilayer thin-film-filter, Mach-Zehnder interference filter; (2) based on the wave filter of grating principle, as grating filter, array waveguide grating wave filter, acousto-optic tunable filter.Therefore, if same device architecture can be realized all can realize filter function at different frequency range, the processing of device and integrated etc. will be a significant benefit to.
Summary of the invention
The object of the invention is, for solving multiband electromagnetic wave filtering problem, and the electromagnetic wave multi-band wave filter of a kind of side microcavity provided and metal-dielectric-metal waveguide-coupled.
Described multi-band wave filter is metal-insulator-metastructure structure, and intermediate medium part is insulative transparent layer, forms waveguide; Both sides metallic member makes many group sides microcavity, often organizes the corresponding rectangular transmission stopband of side microcavity.Phase differential in the microcavity of two adjacent groups side between arest neighbors two side microcavitys is π.
Often organize side microcavity and comprise three parallel contour wide microcavitys, and three microcavitys are arranged in homonymy metal.Microcavity height determines microcavity eigenfrequency, and the spacing of adjacent microcavity makes phase differential between adjacent microcavity be pi/2.The width of three microcavitys determines the resistance band that this group side microcavity is corresponding, and it highly determines the transmission stopband center position of this group side microcavity and the interval of two adjacent rectangle transmission stopbands.The eigenfrequency often organizing each side microcavity in the microcavity of side is identical, and the eigenfrequency of each group side microcavity is different.
If terahertz wave band, side microcavity is communicated with between waveguide; If communication band, side microcavity is not communicated with between waveguide, by Metal Phase every.
The bandwidth of wave filter depends on the stiffness of coupling between microcavity and waveguide, and stiffness of coupling is changed by the adjustment width of microcavity or the distance between microcavity and waveguide.Design the electromagnetic multi-band wave filter of the multiple frequency range of the tunable adaptation of bandwidth thus.
Beneficial effect
The present invention utilizes metal-insulator-metastructure structure as terahertz waveguide, because gold is very little in the loss of terahertz wave band, can be considered perfect electric conductor; The bandwidth of wave filter can be adjusted by the width adjusting microcavity; The multi-band filtering of terahertz wave band can be realized.There is bandwidth, advantage that stopband number is adjustable; Be convenient to miniaturization and integrated; Also can be applied to other electromagnetic wave frequency range, such as optical-fibre communications frequency range, microwave region etc., meet different-waveband demand.
Accompanying drawing explanation
Fig. 1 is the Terahertz dual-attenuation filter construction schematic diagram based on side microcavity and metal-dielectric-metal waveguide-coupled in specific embodiment;
Fig. 2 is the transmission spectrum of Terahertz dual-attenuation wave filter in specific embodiment;
Fig. 3 is the distribution map of the electric field of Terahertz dual-attenuation wave filter when incident wave wavelength is 0.6mm in specific embodiment, shows that the electromagnetic wave of 0.6mm wavelength cannot through this structure;
Fig. 4 is the distribution map of the electric field of Terahertz dual-attenuation wave filter when incident wave wavelength is 0.8mm in specific embodiment, shows that the electromagnetic wave of 0.8mm wavelength also cannot through this structure;
Fig. 5 is the communication band three stop-band filter structural representation based on side microcavity and metal-dielectric-metal waveguide-coupled in specific embodiment;
Fig. 6 is the transmission spectrum of communication band three stop-band filter in specific embodiment;
Fig. 7 is the distribution map of the electric field of communication band three stop-band filter when incident wave wavelength is 1.49 μm, and it shows that the electromagnetic wave of 1.49 mum wavelengths cannot through this structure;
Fig. 8 is the distribution map of the electric field of communication band three stop-band filter when incident wave wavelength is 1.55 μm, and it shows that the electromagnetic wave of 1.55 mum wavelengths cannot through this structure;
Fig. 9 is the distribution map of the electric field of communication band three stop-band filter when incident wave wavelength is 1.61 μm, and it shows that the electromagnetic wave of 1.61 mum wavelengths cannot through this structure.
Embodiment
In order to better objects and advantages of the present invention are described, be described further below in conjunction with drawings and Examples.
Composition graphs 1 illustrates, Terahertz wave source is from left to right incident, and metal material adopts the gold of high conductivity, and waveguide medium is air; In figure, grey parts represents metal (gold), and blank space represents medium (air), and all sides microcavity is atrium, is directly connected with waveguide.System structure parameter is set to: duct width t
w=100 μm, the width of first group of side microcavity (in Fig. 1 three, the left side) is t
1=15 μm is highly h
1=138 μm, the spacing of adjacent microcavity is l
1=150 μm; The width of second group of coupled micro-cavity (in Fig. 1 three, the right) is t
1=10 μm is highly h
2=191 μm, the spacing of the microcavity that is connected is l
2=200 μm; The spacing of two groups of microcavitys is d=500 μm.
According to Fig. 1 example design device terahertz wave band transmission spectrum as shown in Figure 2, two stopband center are set at 0.6mm and 0.8mm place respectively.
Terahertz dual-attenuation wave filter, when incident electromagnetic wave wavelength is λ=0.6mm, is stopped from the electromagnetic wave of left side incidence by first group of side microcavity, as shown in Figure 3.When the wavelength of incident electromagnetic wave is λ=0.8mm, electromagnetic wave is stopped by second group of side microcavity, as shown in Figure 4.Two kinds of situations all show, corresponding wavelength electromagnetic wave through this structure, thus cannot form transmission stopband, realizes the filtering of many stopbands.
Composition graphs 5 illustrates, communication wave-wave source is from left to right incident, and waveguide medium is air.In figure, grey parts represents metal (gold), and blank space represents medium (air), and all sides microcavity is chamber of remaining silent, and has certain distance with waveguide.System structure parameter is set to: duct width is t
w=0.2 μm, all microcavitys are not communicated with between waveguide, and its standoff distance is 0.015 μm; The width of first group of microcavity (in Fig. 3 three, the left side) is t
1=0.2 μm is highly h
1=0.628 μm, the spacing of adjacent microcavity is l
1=0.339 μm; The width of second group of microcavity (in the middle of Fig. 3 three) is t
2=0.2 μm is highly h
2=0.65 μm, the spacing of adjacent microcavity is l
2=0.351 μm; The width of the 3rd group of microcavity (in Fig. 3 three, the right) is t
3=0.2 μm is highly h
3=0.672 μm, the spacing of adjacent microcavity is l
3=0.363 μm; First group is d with the spacing of second group of microcavity
1=0.69 μm, second group is d with the spacing of the 3rd group of microcavity
3=0.714 μm.
According to Fig. 5 example design device communication band transmission spectrum as shown in Figure 6, three stopband center are set at wavelength 1.49 μm, 1.55 μm and 1.61 μm of places respectively.
Communication band three stop-band filter is when incident electromagnetic wave wavelength is λ=1.49 μm, and incident electromagnetic wave is stopped by one group of side microcavity, as shown in Figure 7.When incident electromagnetic wave wavelength is λ=1.55 μm, incident electromagnetic wave is stopped by second group of side microcavity, as shown in Figure 8.When incident electromagnetic wave wavelength is λ=1.61 μm, incident electromagnetic wave is stopped by the 3rd group of side microcavity, as shown in Figure 9.Three kinds of situations all show, the electromagnetic wave of corresponding wavelength through this structure, thus cannot form transmission stopband, realizes the filtering of many stopbands.
Claims (1)
1. the electromagnetic wave multi-band wave filter of side microcavity and metal-dielectric-metal waveguide-coupled, it is characterized in that: be metal-insulator-metastructure structure, intermediate medium part is insulative transparent layer, forms waveguide; Both sides metallic member makes many group sides microcavity, often organizes the corresponding rectangular transmission stopband of side microcavity; Phase differential in the microcavity of two adjacent groups side between arest neighbors two side microcavitys is π;
Often organize side microcavity and comprise three parallel contour wide microcavitys, and three microcavitys are arranged in homonymy metal; Often in group, the spacing of adjacent microcavity makes phase differential between adjacent microcavity be pi/2; The width of three microcavitys determines the resistance band that this group side microcavity is corresponding, and it highly determines the interval of the eigenfrequency of this group side microcavity, transmission stopband center position and two adjacent rectangle transmission stopbands; The eigenfrequency often organizing each side microcavity in the microcavity of side is identical, and the eigenfrequency of each group side microcavity is different;
The bandwidth of wave filter depends on the stiffness of coupling between microcavity and waveguide, and stiffness of coupling is changed by the adjustment width of microcavity or the distance between microcavity and waveguide; Design the electromagnetic multi-band wave filter of the multiple frequency range of the tunable adaptation of bandwidth thus; If terahertz wave band, side microcavity is communicated with between waveguide; If optical-fibre communications wave band, side microcavity is not communicated with between waveguide, by Metal Phase every.
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| CN103985925B (en) * | 2014-05-04 | 2016-04-20 | 上海理工大学 | THz wave band stop filter filtering channel number controlling method |
| CN104241746A (en) * | 2014-09-09 | 2014-12-24 | 江苏贝孚德通讯科技股份有限公司 | Waveguide high-frequency low-pass filter |
| CN204575891U (en) * | 2015-04-30 | 2015-08-19 | 深圳大学 | Low-loss, little mould field terahertz waveguide |
| CN106299564B (en) * | 2016-10-27 | 2018-10-19 | 桂林电子科技大学 | Plasma curved waveguide filter based on microcavity coupled structure |
| CN107064052B (en) * | 2017-04-26 | 2019-12-27 | 中国计量大学 | Terahertz fingerprint detection sensitivity enhancement method based on microcavity resonance mode |
| CN110311290B (en) * | 2019-07-17 | 2020-10-09 | 重庆邮电大学 | Terahertz multi-frequency linear frequency converter based on photosensitive silicon |
| CN114497933B (en) * | 2022-01-07 | 2023-04-25 | 哈尔滨工业大学 | Adjustable band-stop filter with plasma cladding double-tooth-shaped structure |
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| JP2007072133A (en) * | 2005-09-06 | 2007-03-22 | Nippon Telegr & Teleph Corp <Ntt> | Waveguide type band rejection filter |
| CN200950464Y (en) * | 2006-09-22 | 2007-09-19 | 东南大学 | Semi-module substrate integrated waveguide filter |
| CN201156573Y (en) * | 2008-01-25 | 2008-11-26 | 南京理工大学 | Integrated wave-guide band filter based on foldable substrate |
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