CN104377417B - Spiral artificial surface plasma field intensity intensifier - Google Patents
Spiral artificial surface plasma field intensity intensifier Download PDFInfo
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- CN104377417B CN104377417B CN201410626252.5A CN201410626252A CN104377417B CN 104377417 B CN104377417 B CN 104377417B CN 201410626252 A CN201410626252 A CN 201410626252A CN 104377417 B CN104377417 B CN 104377417B
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Abstract
The invention provides a spiral artificial surface plasma field intensity intensifier which comprises a traditional coaxial waveguide, a transition waveguide from the coaxial waveguide to an artificial surface plasma waveguide, and the spiral artificial surface plasma waveguide. The transition waveguide includes the inner conductor transition and outer conductor transition. The inner conductor transition is achieved through a periodical spiral type groove array with the depth gradually decreased, and the outer conductor transition is achieved through a horn antenna with an opening gradually becoming larger. One part of the spiral artificial surface plasma waveguide is formed by the spiral groove array with the constant depth and width, the gradually decreased radius and the changed period, and the other part of the spiral artificial surface plasma waveguide is a conical top end and is composed of a spiral groove with the depth and the radius reduced at the same time and becoming zero at the top end of a conical point. The spiral artificial surface plasma field intensity intensifier is simple in structure, compact in size, efficient in broadband, high in field intensity intensifying factor, suitable for being used in cooperation with a traditional microwave or terahertz transmission circuit and capable of being widely applied in the fields of microwave or terahertz imaging, the high-resolution medical endoscope technology and the like.
Description
Technical field
The present invention relates to a kind of enhanced intensity device structure, more particularly, to a kind of spiral type artificial surface plasma enhanced intensity
Device structure.
Background technology
Surface plasmons (Surface Plasmon Polaritons, abbreviation SPPs), is to there is metal and medium
A kind of electronics on (typically air) interface and the mixed activation state of photon.SPPs is a kind of surface wave, can break through diffraction
The limit, electromagnetic field is constrained in the range of the sub-wavelength near metal and medium interface, has very strong field enhancement effect.For
The research of SPPs had once once been limited in optical band or higher frequency, due to the good characteristic of SPPs, if by surface etc.
The concept of ion excimer, to low-frequency range (microwave or terahertz wave band), contributes to obtaining high binding microwave or Terahertz
The guided wave technology of signal, and it is highly integrated to realize that the device size of low-frequency range is reduced to sub-wavelength magnitude.But due to gold
The plasma frequency belonging to typically all in ultraviolet band, metal low-frequency range dielectric constant very big so that the skin that becomes of electromagnetic wave
Depth very little, so, in low-frequency range, metal is similar to perfact conductor (Perfect Electric Conductor, PEC), from
And make the field constraint in metal surface for the SPPs very poor it is impossible to realize there is effect spread on the metal surface, greatly limit SPPs
Application in low-frequency range.In recent years it is thus proposed that metal surface borehole or cutting method, electromagnetic field can not only be increased in gold
Penetrating power in genus, can also realize field sub-wavelength constraint, and the equivalent plasma frequency of body structure surface only with surface
The geometric parameter of structure is relevant, such that it is able to carry out engineering design in lower frequency to SPPs.This plasma frequency is subject to table
The surface plasma that face geometry controls is referred to as artificial surface plasmon (Spoof Surface Plasmon
Polaritons, abbreviation SSPPs).Its basic thought is the hole digging period profile in metal surface, the size of hole and interval
Much smaller than wavelength, to strengthen the osmosiss of electromagnetic wave, thus by the means of effective medium reduce metal surface etc.
Ion frequency.2005, Hibbins et al. confirmed SSPPs phenomenon in microwave section, and subsequently, Williams et al. is also in terahertz
Hereby wave band demonstrates the presence of SSPPs, is that new page has been opened in development and the application of low frequency SPPs.SSPPs causes since then
The great interest of researcher.
Metal wire smooth at present is considered as one of best terahertz waveguide.This guided wave has low-loss and low color
Scattered advantage, but constraint is poor.Therefore, Maier et al. has arrived the concept of SSPPs in the geometry position shape of metal wire,
Demonstrate the sub-wavelength ring groove that periodic distribution is carved along its length on ideal wire in theory, SSPPs can be transmitted,
And realize field sub-wavelength constraint, thus realizing the local enhancement effect of microwave or THz wave, for periodicity metal wire structure
In microwave or terahertz imaging, high-resolution medical endoscopes technology, biological detection, national security, food and agricultural product quality
Control, global environment detects and wide prospect has been opened up in the application in the field such as information and radar communication technology.
All the time, the conversion of space guided wave to SPPs is extensively studied, such as by prism-coupled or diffraction grating.But
For how by space guided wave be efficiently converted into SSPPs research very few.2013, Southeast China University proposed one kind in microwave
Frequency range realizes guided wave to the structure of the efficient conversion of SSPPs, and it is tied by traditional co-planar waveguide and " tooth type " ultra-thin periodicity
Structure metal band plasma waveguide is constituted, and devises the matching transition band of gash depth gradual change between the two.Matching transition part
Achieve wave vector coupling and the impedance matching of co-planar waveguide and plasma waveguide, this structure microwave section achieve from guided wave to
High efficiency between Spoof SPPs and wide-band conversion, are plasma functional device and circuit is opened in the highly integrated of microwave section
Create application prospect.However, it is contemplated that ultra-thin " tooth type " plasma waveguide and wire-form plasma waveguide transmission electromagnetic field
The difference of form, such scheme will be no longer applicable.
Content of the invention
In order to achieve the above object, the technical scheme is that and be achieved in that：
On the one hand the method carving the sub-wavelength ring groove of periodic distribution on ideal wire along its length is realized
SSPPs transmits, and on the other hand adopts space guided wave to the thought of the efficient conversion of SSPPs, have devised a kind of spiral type artificial
Surface plasma enhanced intensity device it is characterised in that：Including traditional coaxial waveguide and coaxial waveguide to spiral type artificial surface
The transition waceguide of plasma waveguide, and spiral type artificial surface plasma waveguide；
Wherein, transition waceguide includes inner conductor transition and outer conductor transition, and inner conductor transition is towards spiral type artificial surface etc.
Periodic spin type groove array that ion wave guide direction is incremented by by depth is realized, and outer conductor transition is towards spiral type artificial surface etc.
Ion wave guide direction is realized by the electromagnetic horn that opening becomes larger；Spiral type artificial surface plasma waveguide is by two parts group
Become, Part I is the spiral type groove array that depth and width are constant, inside radius successively decreases, the cycle is constant, Part II is cone
Shape top, is reduced by depth and radius simultaneously and the spiral groove in the vanishing of cone point top is constituted.
It is tapered tip in the tip designs of structure, tapered tip is carved with the spiral type groove of inside radius gradual change to zero,
There is good transition on the top making spiral type groove array to structure.This structure not only makes full use of the stronger field of SSPPs about
Shu Xiaoying, make use of the focus characteristics of pyramidal structure simultaneously, and then the apex in structure enables efficient focusing function.
The present invention can adjust transition waceguide and spiral type plasma waveguide according to the type of coaxial waveguide and size
Physical dimension, thus realize microwave section or terahertz wave band space guided wave efficiently converting with broadband to SSPPs, and then reaches micro-
Ripple or the effect of Terahertz frequency range enhanced intensity, realize artificial surface plasma Meta Materials and are more widely applied.
The present invention has the advantages that：
1. the present invention mainly proposes a kind of spiral type artificial surface plasma field intensity booster structure, comprises traditional coaxial
Waveguide and coaxial waveguide are to the transition waceguide of spiral type artificial surface plasma waveguide, and spiral type plasma wave guide structure.
On the one hand this structure uses for reference co-planar waveguide to the design philosophy of artificial surface plasma waveguide transferring structure, and inner wire is using deep
Spend the spiral type groove structure being incremented by realize the coupling of the wave number between coaxial waveguide and artificial surface plasma waveguide, simultaneously outer
Conductor to realize the impedance matching between coaxial waveguide and artificial surface plasma waveguide using electromagnetic horn gradual change, thus realizing
Space guided wave is to the Efficient Conversion of SSPPs；On the other hand, using the adjustable chromatic dispersion characteristic of artificial surface plasma waveguide, carry
Go out the spiral type plasma waveguide of the radius gradual change high order focusing ability to realize field intensity.This stereochemical structure enables signal
Efficiently input the high order focusing with field intensity, and have bigger flexible in the design of microwave device and integrated circuit structure
Property.
2. structure is simple：Structure comprises traditional coaxial waveguide, coaxial waveguide to spiral type artificial surface plasma waveguide
Transition waceguide, and spiral type artificial surface plasma wave guide structure.Artificial surface plasma waveguide is to be carved with periodicity spiral shell
The metal wire of rotation type groove, simple structure, convenient processing, and not easy fracture.
3. strong innovation, technology is perspective good：The height that the present invention achieves electromagnetic wave in microwave or Terahertz frequency range gathers
Jiao and high efficiency of transmission, strong innovation, have no this class formation both at home and abroad；It can be used cooperatively with traditional microwave transmission line well,
It is easy to be integrated in microwave circuit, has expanded the range of application of artificial surface plasma device, there is good technology perspective.
4. enhanced intensity coefficient is big, bandwidth：The present invention may finally realize artificial surface plasma field intensity booster
The high order focusing of terminal field intensity.In the range of 10GHz～35GHz, permissible in the field intensity of the apex of conical plasmon structures
Reach more than 30 times of field intensity at signal source entry port.
5th, have wide range of applications：The present invention can be in microwave or terahertz imaging, high-resolution medical endoscopes technology, biology
Detection, national security, food and agricultural product quality control, global environment detection and the field such as information and radar communication technology are realized
Extensively apply.
Brief description：
Fig. 1 is the front view of embodiment one；
Fig. 2 (a) is the left view of the coaxial waveguide part of embodiment two；
Fig. 2 (b) is the inner and outer conductor figure of the transition portion of embodiment two；
Fig. 2 (c) be embodiment two spiral type artificial surface plasma waveguide region III structure chart；
Fig. 2 (d) be embodiment two spiral type artificial surface plasma waveguide region IV structure chart；
Fig. 3 is the impact changing to its dispersion characteristics of the depth of groove of embodiment two transition waceguide spiral type groove array
Curve chart；
Fig. 4 is that the impact changing to its dispersion characteristics of the radius of embodiment two plasma wave driving screw type groove array is bent
Line chart；
Fig. 5 is the given viewpoint amplitude of field strength of embodiment two with frequency variation curve figure；
Fig. 6 is the amplitude of field strength ratio of point of observation 2 and point of observation 1 with frequency variation curve figure.
Specific embodiments：
Enforcement to technical scheme is described in further detail below in conjunction with the accompanying drawings：
Embodiment one
As shown in figure 1, enhanced intensity device is made up of three parts.Part I (region I) is traditional coaxial waveguide, makees
Input for signal；Part II (region II) is transition waceguide, including inner conductor transition and outer conductor transition, inner wire mistake
Cross the periodic spin type groove array being incremented by towards spiral type artificial surface plasma waveguide direction by depth to realize, outer conductor mistake
Cross and realized by the electromagnetic horn that opening gradually magnifies towards spiral type artificial surface plasma waveguide direction；Part III (region III
With region IV), it is spiral type artificial surface plasma waveguide：Region III is the first of spiral type artificial surface plasma waveguide
Part, is the spiral type groove array that depth and width are constant, inside radius successively decreases, the cycle is constant, and region IV is that spiral type is artificial
The Part II of surface plasma waveguide, is to be reduced by depth and inside radius and recessed in the spiral type of cone point top vanishing simultaneously
The tapered tip that groove is constituted.The parameters of structural dimension of transition waceguide and spiral type ion waveguide can according to the type of coaxial waveguide and
Size, to adjust, is matched with coaxial waveguide parameter (as waveguide type, waveguide length, waveguide cross-section size etc.).
Embodiment two
Taking structure as shown in Fig. 2 (a) as a example, region I is traditional coaxial waveguide, single overall length L1=10 millimeters, waveguide
Inner conductor outer diameter 2R1=7 millimeters, outer conductor internal diameter 2R2=16 millimeters, wall thickness t=1 millimeter.Coaxial waveguide is as guided wave signals
Input.
Transition waceguide is connected with coaxial waveguide, plays the effect that space wave is efficiently converted into SSPPs signal.As Fig. 2
B, shown in (), transition waceguide region II includes inner wire and outer conductor transition.The gradual change of inner conductor transition spiral type groove array is deep
Degree is from h1=0 millimeter uniformly increases to h2=1 millimeter, the remainder of spiral type groove array keeps ultimate depth h of gradual change2,
The external diameter of inner conductor transition spiral type groove array keeps 2R1Constant, for realizing coaxial waveguide and artificial surface plasma wave
Wave number coupling between leading, the impact changing to its dispersion characteristics of ring groove depth is as shown in Figure 3.The loudspeaker sky of outer conductor
Line gradual change internal diameter is from 2R2Press cone angle=10 ° for=16 millimeters to be incremented by, terminate at the total length reaching transition waceguide, thickness is t=1
Millimeter, for realizing the impedance matching between coaxial waveguide and artificial surface plasma waveguide, two neighboring spiral shell in transition waceguide
The horizontal cycle spacing p=3 millimeter of rotation type groove, recess width is a=1.5 millimeter, and the total length of transition waceguide is L2=30
Millimeter.
The carrier that spiral type plasma waveguide transmits as SSPPs signal enhancing.As shown in Fig. 2 (c), Part I (area
Domain III) spiral type plasma waveguide, conductor inside radius is from r1=2.5 millimeters are uniformly reduced to r2=0.2 millimeter, r1For transition
The inside radius of waveguide destination county inner conductor transition spiral type groove；The horizontal cycle distance value of two neighboring spiral type groove is p
=3 millimeters, recess width is a=1.5 millimeter, and depth is h2=1 millimeter, all keep constant, length L3=63 millimeters.As Fig. 2
D, shown in (), Part II (region IV) is tapered tip, by depth from h2, inside radius is from r2Reduce simultaneously and become on cone point top
It is zero spiral groove composition, length L4=10 millimeters.The impact to its dispersion characteristics for the change of spiral type groove radius is such as
Shown in Fig. 4.This embodiment enhanced intensity device total length is 113 millimeters.
According to embodiment two, can get enhanced intensity efficiency as shown in Figure 5 using electromagnetic simulation software, 10GHz～
In the range of 35GHz, can reach coaxial line in the field intensity of the apex (point of observation 2) of spiral type artificial surface plasmon structures incident
More than 30 times of port (point of observation 1) field intensity, as shown in Figure 6.
Claims (4)
1. a kind of spiral type artificial surface plasma field intensity booster it is characterised in that：Including traditional coaxial waveguide with coaxially
Waveguide is to the transition waceguide of spiral type artificial surface plasma waveguide, and spiral type artificial surface plasma waveguide；
Wherein, transition waceguide includes inner conductor transition and outer conductor transition, and inner conductor transition is towards spiral type artificial surface plasma
The periodic spin type groove array that wave guide direction is incremented by by depth is realized, and outer conductor transition is towards spiral type artificial surface plasma
Wave guide direction is realized by the electromagnetic horn that opening becomes larger；Spiral type artificial surface plasma waveguide is made up of two parts, the
A part is the spiral type groove array that depth and width are constant, inside radius successively decreases, the cycle is constant, and Part II is taper top
End, is reduced by depth and radius simultaneously and the spiral groove in the vanishing of cone point top is constituted.
2. a kind of spiral type artificial surface plasma field intensity booster according to claim 1 it is characterised in that：Little bellow
In leading, the spiral type groove array gradual change of inner conductor transition adopts depth from h1Start uniform increments to h2, spiral type groove array
The horizontal cycle distance of two neighboring groove is p, and recess width is a；The electromagnetic horn gradual change of outer conductor transition adopt internal diameter from
2R2Smooth according to cone angle and be incremented by, terminate at the total length reaching transition waceguide, thickness keeps constant, transition waceguide overall length for t
Spend for L2, parameter h1、h2, p, a, R2、t、α、L2With coaxial waveguide match parameters.
3. a kind of spiral type artificial surface plasma field intensity booster according to claim 1 it is characterised in that：Spiral type
The Part I of artificial surface plasma waveguide is conductor inside radius from r1Gradually uniformly it is decremented to through period spin type groove
r2, the horizontal cycle distance of two neighboring spiral type groove is p, recess width is a, depth is h2, all keep constant, total length
For L3；Part II is length is L4Tapered tip, be carved with depth above from h2, inside radius is from r2It is decremented to zero screw type
Groove, parameter r1、r2、p、a、h、L3、L4With coaxial waveguide match parameters.
4. according to a kind of arbitrary described spiral type artificial surface plasma field intensity booster of claim 1-3 it is characterised in that：
Coaxial waveguide is as the input of guided wave signals.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105703048B (en) * | 2016-01-13 | 2018-07-13 | 北京大学 | A kind of ultra wide band Terahertz class surface plasma excimer coupler and coupling process |
| CN108844914B (en) * | 2018-05-28 | 2020-09-11 | 南开大学 | Terahertz super-resolution imaging device and imaging method based on metal probe |
| CN113671629B (en) * | 2021-08-26 | 2022-07-29 | 桂林电子科技大学 | New method for constructing plasma wave interferometer in optical fiber core |
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| CN104064875A (en) * | 2014-07-02 | 2014-09-24 | 南京理工大学 | Waveguide-type W wave band circularly polarized horn antenna |
| CN104078732A (en) * | 2014-03-25 | 2014-10-01 | 浙江大学 | Terahertz wave transmission power splitting and combining structure |
-
2014
- 2014-11-07 CN CN201410626252.5A patent/CN104377417B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4231042A (en) * | 1979-08-22 | 1980-10-28 | Bell Telephone Laboratories, Incorporated | Hybrid mode waveguide and feedhorn antennas |
| CN102255121A (en) * | 2011-05-11 | 2011-11-23 | 东南大学 | Broadband slow wave system based on cylindrical line waveguide excitation |
| CN202111206U (en) * | 2011-05-11 | 2012-01-11 | 东南大学 | Multidirectional surface wave separator |
| CN102856622A (en) * | 2012-09-21 | 2013-01-02 | 东南大学 | Directional coupler on basis of spoof surface plasmon polariton |
| CN103066380A (en) * | 2013-01-22 | 2013-04-24 | 上海航天测控通信研究所 | Specific beam forming antenna |
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| CN104064875A (en) * | 2014-07-02 | 2014-09-24 | 南京理工大学 | Waveguide-type W wave band circularly polarized horn antenna |
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