CN104253294A - Artificial surface plasmon field strength enhancer - Google Patents
Artificial surface plasmon field strength enhancer Download PDFInfo
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- CN104253294A CN104253294A CN201410318752.2A CN201410318752A CN104253294A CN 104253294 A CN104253294 A CN 104253294A CN 201410318752 A CN201410318752 A CN 201410318752A CN 104253294 A CN104253294 A CN 104253294A
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Abstract
The invention provides an artificial surface plasmon field strength enhancer, which comprises a traditional coaxial waveguide, a transition waveguide from the coaxial waveguide to an artificial surface plasmon waveguide, and a conical plasmon waveguide, wherein the transition waveguide comprises inner conductor and outer conductor transition, and the inner conductor transition is realized by a depth-increasing periodic annular groove array; the outer conductor transition is realized by a horn antenna with a gradually increased opening, and the conical plasmon waveguide consists of an annular groove array with constant depth and width, decreasing radius, and changeable period. The artificial surface plasmon field strength enhancer provided by the invention has the advantages of simple structure, compact size, efficient wideband, and high field strength enhancement multiples, is suitable for being matched with the traditional microwave or terahertz transmission circuit for use, and can be widely applied to the fields of microwave or terahertz imaging, high-resolution medicine endoscope technology, bio-detection, national security, food and agricultural product quality control, global environmental monitoring and information and radar communication technology and the like.
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, someone proposes method in metal surface borehole or cutting to increase electromagnetic field in intrametallic penetrating power, thus can carry out engineering design at lower frequency to SPPs.This plasma frequency is called as artificial surface plasma (Spoof Surface Plasmon Polaritons is called for short SSPPs) by the surface plasma that surface geometry controls.Its basic thought is the hole digging period profile in metal surface, and size and the interval of hole are all less than wavelength, to strengthen electromagnetic osmosis, thus reduces the plasma frequency of metal surface by the means of effective medium.2005, the people such as Hibbins confirmed SSPPs phenomenon in microwave section, and 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 SPPs be propagated on its surface, but after having had the hole of period profile, SPPs not only can be propagated in surface, can also realize the sub-wavelength constraint of field, and the plasma frequency of periodicity sub-wavelength structure can be changed flexibly by the physical dimension changing sub-wavelength structure.Metal wire smooth is at present considered to one of best terahertz waveguide.This guided wave has the advantage of low-loss and low dispersion, but retrains poor.Therefore, the people such as Maier have arrived the concept of SSPPs on the geometry position shape of metal wire, demonstrate the ring groove carving periodic distribution on ideal wire along its length in theory, can SSPPs be transmitted and realize field sub-wavelength constraint, thus realize the local enhancement effect of microwave or THz wave, for periodicity metal wire structure is at 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, space guided wave is extensively studied to the conversion of SPPs, as passed through prism-coupled or diffraction grating.But study very few for guided wave to the conversion of SSPPs.2013, Southeast China University proposes and a kind ofly realizes the structure of guided wave to the efficient conversion of SSPPs at microwave frequency band, it is by traditional co-planar waveguide (coplanar waveguipe, be called for short CPW) and " tooth type " plasma waveguide (ultra-thin periodic structure metal band) formation, devise the matching transition band of gash depth gradual change between the two.Matching transition part achieves wave vector coupling and the impedance matching of CPW and plasma waveguide, this structure achieves from guided wave to the high efficiency of Spoof SPPs and wide-band conversion in microwave section, for plasma function element and circuit have started application prospect the height of microwave section is integrated.But consider the difference of ultra-thin " tooth type " plasma waveguide and wire-form plasma waveguide transmission electromagnetic field pattern, such scheme will be no longer applicable.
Summary of the invention
In order to achieve the above object, technical scheme of the present invention is achieved in that
A kind of artificial surface plasma field intensity booster, is characterized in that: comprise traditional coaxial waveguide and the coaxial waveguide transition waceguide to artificial surface plasma waveguide, and conical plasma waveguide;
Wherein, transition waceguide comprises inner wire and outer conductor transition, and the periodicity ring groove array that inner conductor transition is increased progressively by the degree of depth realizes, and outer conductor transition becomes large horn antenna gradually by opening and realizes; Conical plasma waveguide is made up of the ring groove array of the degree of depth and constant width, decreasing radius, mechanical periodicity.
The present invention can regulate the physical dimension of transition waceguide and conical plasma waveguide according to the type of coaxial waveguide and size, thus realize the conversion to SSPPs of microwave section or terahertz wave band space guided wave, and then reach the effect of microwave or Terahertz frequency range enhanced intensity, realize artificial surface plasma Meta Materials and apply more widely.
The present invention has following beneficial effect:
1. the present invention mainly proposes a kind of artificial surface plasma field intensity booster structure, comprises traditional coaxial waveguide and the coaxial waveguide transition waceguide to artificial surface plasma waveguide, and conical plasma wave guide structure.This structure uses for reference the design philosophy of coaxial waveguide to artificial surface plasma waveguide transferring structure on the one hand, propose the ring groove structure that utilizes the degree of depth to increase progressively to realize wave number coupling between coaxial waveguide and artificial surface plasma waveguide and outer conductor adopts horn antenna gradual change to realize the impedance matching between coaxial waveguide and artificial surface plasma waveguide, thus implementation space guided wave is to the Efficient Conversion of SSPPs, on the other hand, utilize the adjustable chromatic dispersion characteristic of artificial surface plasma waveguide, the conical plasma waveguide proposing radius gradual change realizes the high order focusing ability of field intensity.This stereochemical structure can realize the efficient input of signal and the high order focusing of field intensity and have greater flexibility in the design of microwave device and integrated circuit structure.
2. strong innovation, technology is perspective good: the present invention achieves electromagnetic high order focusing and high efficiency of transmission, strong innovation at microwave or Terahertz frequency range, has no this class formation both at home and abroad; It can well with traditional microwave transmission line with the use of, expanded the range of application of artificial surface plasma device, there is good technology perspective.
3. enhanced intensity coefficient is large: the present invention finally can realize the high order focusing of the terminal field intensity of artificial surface plasma field intensity booster.Nearly 12 times of signal source entry port place field intensity can be reached in the field intensity at the summit place of conical plasmon structures, nearly 5 times of transition waceguide end field intensity can be reached simultaneously.
4, have wide range of applications: the present invention can at microwave or terahertz imaging, and 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 extensive use.
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 that the change of the depth of groove of embodiment two transition waceguide ring groove array is to the influence curve figure of its dispersion characteristics;
Fig. 4 is that the change of the radius of embodiment two plasma wave lead ring type groove array is to the influence curve figure of its dispersion characteristics;
Fig. 5 is that the given viewpoint field intensity of embodiment two is with frequency variation curve figure.
Specific embodiments:
Be described in further detail below in conjunction with the enforcement of accompanying drawing to technical scheme:
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, signal input; Region II is transition waceguide, comprises inner wire and outer conductor transition, and the periodicity ring groove array that inner conductor transition is increased progressively by the degree of depth realizes, and the horn antenna that outer conductor transition is magnified gradually by opening realizes; Region III is conical plasma waveguide, is made up of the ring groove array of the degree of depth and constant width, decreasing radius, mechanical periodicity.The parameters of structural dimension of transition waceguide and conical ion waveguide regulates according to the type of coaxial waveguide and size, matches with coaxial waveguide parameter (as waveguide type, waveguide length, waveguide cross-section size etc.).
Embodiment two
For structure shown in such as Fig. 2 (b), region I is traditional coaxial waveguide, single overall length L
1=200 microns, waveguide inner conductor outer diameter 2R
1=280 microns, outer conductor internal diameter 2R
2=644 microns, wall thickness t=10 micron.Coaxial waveguide is as the input of guided wave signals.
Transition waceguide is connected with coaxial waveguide, plays effect signal being converted into efficiently SSPPs signal.As shown in Fig. 2 (c), transition waceguide region II comprises inner wire and outer conductor transition.The gradual change degree of depth of inner conductor transition ring groove array is from h
1=2.5 microns increase to h gradually by step delta h=2.5 micron
2=30 microns, the remainder of ring groove array keeps the ultimate depth h of gradual change
2, be used for realizing the wave number coupling between coaxial waveguide and artificial surface plasma waveguide, the change of the ring groove degree of depth on the impact of its dispersion characteristics as shown in Figure 3.The horn antenna gradual change internal diameter of outer conductor is from 2R
2=644 microns increase progressively by cone angle=10 °, the total length place arriving transition waceguide terminates, thickness is t=10 micron, be used for realizing the impedance matching between coaxial waveguide and artificial surface plasma waveguide, the horizontal cycle spacing p=100 micron of adjacent two ring grooves in transition waceguide, recess width is a=50 micron, and the total length of transition waceguide is L
2=1600 microns.
Conical plasma waveguide strengthens the carrier of transmission as SSPPs signal.As shown in Fig. 2 (d), the conical plasma waveguide of region III, conductor radius is from R
1=140 microns are decremented to R according to constant step size Δ R=5 micron
3=40 microns; The horizontal cycle distance value of adjacent two ring grooves is p=100 micron, and recess width is a=50 micron, and the degree of depth is h
2=30 microns, all remain unchanged, length L
3=2100 microns, the change of ring groove radius on the impact of its dispersion characteristics as shown in Figure 4.This embodiment enhanced intensity device total length is 3900 microns.
According to embodiment two, utilize the enhanced intensity usefulness that electromagnetic simulation software can obtain as shown in Figure 5, nearly 12 times of coaxial line entry port place (point of observation 1) field intensity can be reached in the field intensity at the summit place (point of observation 3) of conical plasmon structures, about 5 times of transition waceguide end (point of observation 2) field intensity can be reached.
Claims (5)
1. an artificial surface plasma field intensity booster, is characterized in that: comprise traditional coaxial waveguide and the coaxial waveguide transition waceguide to artificial surface plasma waveguide, and conical plasma waveguide;
Wherein, transition waceguide comprises inner wire and outer conductor transition, and the periodicity ring groove array that inner conductor transition is increased progressively by the degree of depth realizes, and outer conductor transition becomes large horn antenna gradually by opening and realizes; Conical plasma waveguide is made up of the ring groove array of the degree of depth and constant width, decreasing radius, mechanical periodicity.
2. a kind of artificial surface plasma field intensity booster according to claim 1, is characterized in that: in transition waceguide, and the ring groove array gradual change of inner conductor transition adopts the degree of depth from h
1h is incremented to according to constant step size Δ h
2, the remainder of ring groove array keeps the ultimate depth h of gradual change
2; The horizontal cycle distance of adjacent two grooves of ring groove array is p; The horn antenna gradual change of outer conductor transition adopts internal diameter from 2R
2smoothly increase progressively according to cone angle, the total length place arriving transition waceguide terminates, and thickness is that t remains unchanged, and the single total length of transition waceguide is L
2, parameter h
1, Δ h, h
2, p, R
2, t, α, L
2with coaxial waveguide match parameters.
3. a kind of artificial surface plasma field intensity booster according to claim 1 and 2, is characterized in that: the conductor radius of conical plasma waveguide is from R
1r is decremented to according to constant step size Δ R
3; The horizontal cycle distance of adjacent two ring grooves is p, and recess width is a, and the degree of depth is h
2, all remain unchanged; Total length is L
3, parameter R
1, Δ R, R
3, p, a, h
2, L
3with coaxial waveguide match parameters.
4. a kind of artificial surface plasma field intensity booster according to claim 1 and 2, is characterized in that: coaxial waveguide is as the input of guided wave signals.
5. a kind of artificial surface plasma field intensity booster according to claim 3, is characterized in that: coaxial waveguide is as the input of guided wave signals.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104852254A (en) * | 2015-04-13 | 2015-08-19 | 东南大学 | Broadband surface Plasmon radiator |
| CN110768022A (en) * | 2019-10-31 | 2020-02-07 | Oppo广东移动通信有限公司 | Lens structure, lens antenna and electronic equipment |
| CN113346211A (en) * | 2021-06-04 | 2021-09-03 | 北京邮电大学 | Electromagnetic wave transmission waveguide |
| CN113488751A (en) * | 2021-06-24 | 2021-10-08 | 电子科技大学 | Rectangular waveguide-artificial surface plasmon polariton transition structure |
| CN114924352A (en) * | 2022-05-17 | 2022-08-19 | 浙江大学 | Apodized grating coupler for coupling optical fiber and mixed surface plasma waveguide |
Citations (2)
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| 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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2014
- 2014-07-04 CN CN201410318752.2A patent/CN104253294B/en not_active Expired - Fee Related
Patent 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 |
Non-Patent Citations (1)
| Title |
|---|
| A. I. FERN´ANDEZ-DOM´INGUEZ等: "Spoof Surface Plasmon Polariton Modes Propagating Along Periodically Corrugated Wires", 《IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104852254A (en) * | 2015-04-13 | 2015-08-19 | 东南大学 | Broadband surface Plasmon radiator |
| CN104852254B (en) * | 2015-04-13 | 2018-03-20 | 东南大学 | A kind of wideband surface phasmon radiator |
| CN110768022A (en) * | 2019-10-31 | 2020-02-07 | Oppo广东移动通信有限公司 | Lens structure, lens antenna and electronic equipment |
| 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 |
| CN113346211A (en) * | 2021-06-04 | 2021-09-03 | 北京邮电大学 | Electromagnetic wave transmission waveguide |
| CN113488751A (en) * | 2021-06-24 | 2021-10-08 | 电子科技大学 | Rectangular waveguide-artificial surface plasmon polariton transition structure |
| CN114924352A (en) * | 2022-05-17 | 2022-08-19 | 浙江大学 | Apodized grating coupler for coupling optical fiber and mixed surface plasma waveguide |
| CN114924352B (en) * | 2022-05-17 | 2023-03-10 | 浙江大学 | Apodized grating coupler for coupling optical fiber and mixed surface plasma waveguide |
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| CN104253294B (en) | 2016-11-23 |
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