CN104253294B - A kind of artificial surface plasma field intensity booster - Google Patents
A kind of artificial surface plasma field intensity booster Download PDFInfo
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- CN104253294B CN104253294B CN201410318752.2A CN201410318752A CN104253294B CN 104253294 B CN104253294 B CN 104253294B CN 201410318752 A CN201410318752 A CN 201410318752A CN 104253294 B CN104253294 B CN 104253294B
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Abstract
The present invention provides a kind of artificial surface plasma field intensity booster, including traditional coaxial waveguide, the transition waceguide of coaxial waveguide to artificial surface plasma waveguide and cone plasma waveguide；Wherein, transition waceguide includes inner wire and outer conductor transition, and the periodicity ring groove array that inner conductor transition is incremented by by the degree of depth realizes, and the electromagnetic horn that outer conductor transition is become larger by opening realizes；Cone plasma waveguide ring groove array constant by depth and width, decreasing radius, mechanical periodicity forms.The present invention has simple in construction, compact dimensions, high-efficiency broadband band, enhanced intensity multiple height, and be suitable for mating the series of advantages such as use with traditional microwave or Terahertz transmission circuit, and can be at microwave or terahertz imaging, high-resolution medical endoscopes technology, biological detection, national security, food and agricultural product quality control, global environment detects and the field such as information and radar communication technology realizes extensively application.
Description
Technical field
The present invention relates to a kind of enhanced intensity device structure, particularly relate to a kind of artificial surface plasma field intensity booster structure.
Background technology
In recent years, it is thus proposed that the method at metal surface borehole or cutting increases electromagnetic field in intrametallic penetrating power, from
And at lower frequency, SPPs can be carried out engineering design.The surface that this plasma frequency is controlled by surface geometry etc. from
Daughter is referred to as artificial surface plasma (Spoof Surface Plasmon Polaritons is called for short SSPPs).Its basic thought
It is the hole digging period profile in metal surface, the size of hole and interval both less than wavelength, to strengthen the osmosis of electromagnetic wave,
Thus the plasma frequency of metal surface is reduced by the means of effective medium.2005, Hibbins et al. demonstrate,proved in microwave section
Real SSPPs phenomenon, SSPPs causes the great interest of researcher since then.
In general, metal is approximately perfact conductor in low-frequency range (microwave section), therefore can not propagate SPPs on its surface,
But after having had the hole of period profile, surface is possible not only to propagate SPPs, it is also possible to the sub-wavelength realizing field retrains, and the cycle
Property sub-wavelength structure plasma frequency can by change sub-wavelength structure physical dimension change flexibly.The most smooth gold
Belonging to line is considered as one of best terahertz waveguide.This guided wave has low-loss and the advantage of low dispersion, but retrains poor.
Therefore, Maier et al. has arrived the concept of SSPPs in the geometry position shape of metal wire, demonstrates in theory at ideal wire
On carve the ring groove of periodic distribution along its length, SSPPs can be transmitted and realize the sub-wavelength constraint of field, thus realizing
The local enhancement effect of microwave or THz wave, for periodicity metal wire structure in microwave or terahertz imaging, high-resolution medical science
Endoscopic technique, biological detection, national security, food and agricultural product quality control, global environment detects and information is led to radar
Wide prospect has been opened up in the application in the fields such as letter technology.
All the time, the conversion of space guided wave to SPPs is extensively studied, as by prism-coupled or diffraction grating.But for
Guided wave is but studied the fewest to the conversion of SSPPs.2013, Southeast China University proposed and a kind of realizes guided wave to SSPPs at microwave frequency band
The structure of efficiently conversion, it is by traditional co-planar waveguide (coplanar waveguipe is called for short CPW) and " tooth type " etc.
Ion waveguide (ultra-thin periodic structure metal band) is constituted, and devises the matching transition band of gash depth gradual change between the two.
Matching transition part achieve CPW and plasma waveguide wave vector coupling and impedance matching, this structure microwave section achieve from
Guided wave is changed to high efficiency and the wide-band of Spoof SPPs, opens in the highly integrated of microwave section for plasma functional device and circuit
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 the most applicable.
Summary of the invention
In order to achieve the above object, the technical scheme is that and be achieved in that:
A kind of artificial surface plasma field intensity booster, it is characterised in that: include that traditional coaxial waveguide and coaxial waveguide are to artificial
The transition waceguide of surface plasma waveguide, and cone plasma waveguide；
Wherein, transition waceguide includes inner conductor transition and outer conductor transition, and inner conductor transition is passed by cycle and constant width, the degree of depth
The periodicity ring groove array increased realizes, and the electromagnetic horn that outer conductor transition is become larger by opening realizes；Cone plasma
Waveguide is constant by cycle, depth and width, the periodicity ring groove array composition of decreasing radius.
The present invention can regulate transition waceguide and the structure chi of cone plasma waveguide according to the type of coaxial waveguide and size
Very little, thus realize the conversion to SSPPs of microwave section or terahertz wave band space guided wave, and then reach microwave or Terahertz frequency range field
The strong effect strengthened, it is achieved artificial surface plasma Meta Materials is more widely applied.
There is advantages that
1. the present invention mainly proposes a kind of artificial surface plasma field intensity booster structure, comprises traditional coaxial waveguide and on-axis wave
Lead the transition waceguide of artificial surface plasma waveguide, and cone plasma wave guide structure.On the one hand this structure is used for reference same
Axle waveguide is to the design philosophy of artificial surface plasma waveguide transferring structure, it is proposed that the ring groove structure utilizing the degree of depth to be incremented by is come
Realize the coupling of the wave number between coaxial waveguide and artificial surface plasma waveguide and outer conductor employing electromagnetic horn gradual change realizes same
Impedance matching between axle waveguide and artificial surface plasma waveguide, thus realize the space guided wave Efficient Conversion to SSPPs, separately
On the one hand, utilizing the adjustable chromatic dispersion characteristic of artificial surface plasma waveguide, the conical plasma waveguide proposing radius gradual change comes
Realize the high order focusing ability of field intensity.What this stereochemical structure can realize signal efficiently inputs the high order focusing with field intensity and micro-
The design of wave device and integrated circuit structure has greater flexibility.
2. strong innovation, technology is perspective good: the present invention achieves high order focusing and the height of electromagnetic wave at microwave or Terahertz frequency range
Effect transmission, strong innovation, have no this class formation both at home and abroad；It can well with traditional microwave transmission line with the use of, expand
The range of application of artificial surface plasma device, has good technology perspective.
3. enhanced intensity coefficient is big: the present invention may finally realize the height of the terminal field intensity of artificial surface plasma field intensity booster
Focus on.The field intensity of apex at cone plasmon structures can reach at signal source entry port nearly 12 times of field intensity, simultaneously
Transition waceguide can be reached and terminate to locate nearly 5 times of field intensity.
4, have wide range of applications: the present invention can at microwave or terahertz imaging, high-resolution medical endoscopes technology, biological detection,
National security, food and agricultural product quality control, global environment detects and the field such as information and radar communication technology realizes extensively should
With.
Accompanying drawing illustrates:
Fig. 1 is the front view of embodiment one；
Fig. 2 (a) is the structural profile front view of embodiment two；
Fig. 2 (b) is the left view of the coaxial waveguide part of embodiment two；
Fig. 2 (c) is the inner and outer conductor figure of the transition portion of embodiment two；
Fig. 2 (d) be embodiment two artificial surface plasma waveguide figure；
Fig. 3 is the change of the depth of groove of the embodiment two transition waceguide ring groove array influence curve figure to its dispersion characteristics；
Fig. 4 is the change of the radius of the embodiment two plasma wave lead ring type groove array influence curve figure to its dispersion characteristics；
Fig. 5 is that the given viewpoint field intensity of embodiment two is 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, Figure 2 shown in (a), enhanced intensity device is made up of three parts.Region I is traditional coaxial waveguide, as
The input of signal；Region II is transition waceguide, and including inner conductor transition and outer conductor transition, inner conductor transition is by cycle and width
Spending constant, the periodicity ring groove array that the degree of depth is incremented by realizes, and the electromagnetic horn that outer conductor transition is gradually magnified by opening realizes；
Region III is cone plasma waveguide, the periodicity ring groove array group of decreasing radius constant by cycle, depth and width
Become.The parameters of structural dimension of transition waceguide and cone ion waveguide regulates according to type and the size of coaxial waveguide, and coaxially
Waveguide parameter (such as waveguide type, waveguide length, waveguide cross-section size etc.) matches.
Embodiment two
As a example by structure as shown in Fig. 2 (b), region I is traditional coaxial waveguide, single overall length L1=200 microns, in waveguide
Conductor diameter 2R1=280 microns, outer conductor internal diameter 2R2=644 microns, wall thickness t=10 micron.Coaxial waveguide is as guided wave signals
Input.
Transition waceguide is connected with coaxial waveguide, plays the effect that signal is converted into SSPPs signal efficiently.Such as Fig. 2 (c) institute
Showing, transition waceguide region II includes inner wire and outer conductor transition.The gradual change degree of depth of inner conductor transition ring groove array is from h1=2.5
Micron is gradually increased to h by step delta h=2.5 micron2=30 microns, the remainder of ring groove array keeps the final deep of gradual change
Degree h2, it being used for the wave number coupling realizing between coaxial waveguide and artificial surface plasma waveguide, the change of the ring groove degree of depth is to it
The impact of dispersion characteristics is as shown in Figure 3.The electromagnetic horn gradual change internal diameter of outer conductor is from 2R2Pass by cone angle=10 ° for=644 microns
Increasing, arrive and terminate at the total length of transition waceguide, thickness is t=10 micron, is used for realizing coaxial waveguide and artificial surface plasma
Impedance matching between waveguide, the horizontal cycle spacing p=100 micron of adjacent two ring grooves, recess width in transition waceguide
For a=50 micron, the total length of transition waceguide is L2=1600 microns.
Cone plasma waveguide strengthens the carrier of transmission as SSPPs signal.As shown in Fig. 2 (d), the circular cone of region III
Shape plasma waveguide, conductor radius is from R1=140 microns are decremented to R according to constant step size Δ R=5 micron3=40 microns；Adjacent two
The horizontal cycle distance value of individual ring groove is p=100 micron, and recess width is a=50 micron, and the degree of depth is h2=30 microns, all
Keep constant, length L3=2100 microns, the change of ring groove radius is on the impact of its dispersion characteristics as shown in Figure 4.This is real
Executing example enhanced intensity device total length is 3900 microns.
According to embodiment two, utilize the available enhanced intensity usefulness as shown in Figure 5 of electromagnetic simulation software, at cone plasma
The field intensity of the apex (point of observation 3) of structure can reach at coaxial line entry port nearly 12 times of (point of observation 1) field intensity, can
Reach transition waceguide and terminate to locate about 5 times of (point of observation 2) field intensity.
Claims (5)
1. an artificial surface plasma field intensity booster, it is characterised in that: include that traditional coaxial waveguide and coaxial waveguide are to people
The transition waceguide of work surface plasma waveguide, and cone plasma waveguide；
Wherein, transition waceguide includes inner conductor transition and outer conductor transition, and inner conductor transition is passed by cycle and constant width, the degree of depth
The periodicity ring groove array increased realizes, and the electromagnetic horn that outer conductor transition is become larger by opening realizes；Cone plasma
Waveguide is constant by cycle, depth and width, the periodicity ring groove array composition of decreasing radius.
A kind of artificial surface plasma field intensity booster the most according to claim 1, it is characterised in that: in transition waceguide,
The ring groove array gradual change of inner conductor transition uses the degree of depth from h1It is incremented to h according to constant step size △ h2, its of ring groove array
Remaining part divides ultimate depth h keeping gradual change2；The horizontal cycle distance of adjacent two grooves of ring groove array is p；Outer conductor mistake
The electromagnetic horn gradual change crossed uses internal diameter from 2R2It is incremented by according to cone angle is smooth, arrives and terminate at the total length of transition waceguide, thick
Spending and keep constant for t, transition waceguide total length is L2, parameter h1、△h、h2、p、R2、t、α、L2Join with coaxial waveguide
Number matches.
A kind of artificial surface plasma field intensity booster the most according to claim 1 and 2, it is characterised in that: cone etc.
The conductor radius of ion waveguide is from R1It is decremented to R according to constant step size △ R3；The horizontal cycle distance of adjacent two ring grooves is
P, recess width is a, and the degree of depth is h2, all keep constant；Total length is L3, parameter R1、△R、R3、p、a、h2、L3
With coaxial waveguide match parameters.
A kind of artificial surface plasma field intensity booster the most according to claim 1 and 2, it is characterised in that: coaxial waveguide
Input as guided wave signals.
A kind of artificial surface plasma field intensity booster the most according to claim 3, it is characterised in that: coaxial waveguide conduct
The input of guided wave signals.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104852254B (en) * | 2015-04-13 | 2018-03-20 | 东南大学 | A kind of wideband surface phasmon radiator |
| CN110768022B (en) * | 2019-10-31 | 2021-10-22 | Oppo广东移动通信有限公司 | Lens structure, lens antenna and electronic equipment |
| CN113346211B (en) * | 2021-06-04 | 2022-07-19 | 北京邮电大学 | Electromagnetic wave transmission waveguide |
| CN113488751B (en) * | 2021-06-24 | 2022-06-03 | 电子科技大学 | Rectangular waveguide-artificial surface plasmon polariton transition structure |
| CN114924352B (en) * | 2022-05-17 | 2023-03-10 | 浙江大学 | Apodized grating coupler for coupling optical fiber and mixed surface plasma waveguide |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04335328A (en) * | 1991-05-10 | 1992-11-24 | Hitachi Ltd | Second harmonic generating element and production thereof and light source device formed by using second harmonic generating element |
| CN203553320U (en) * | 2013-10-25 | 2014-04-16 | 东南大学 | Efficient surface plasma element transmission line |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04335328A (en) * | 1991-05-10 | 1992-11-24 | Hitachi Ltd | Second harmonic generating element and production thereof and light source device formed by using second harmonic generating element |
| CN203553320U (en) * | 2013-10-25 | 2014-04-16 | 东南大学 | Efficient surface plasma element transmission line |
Non-Patent Citations (2)
| Title |
|---|
| A. I. Fern´andez-Dom´ı * |
| nguez等.Spoof Surface Plasmon Polariton Modes Propagating Along Periodically Corrugated Wires.《IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS》.2008,第14卷(第6期),全文. * |
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