CN208000989U - The annular surface wave transmission line of coplanar wave guide feedback - Google Patents
The annular surface wave transmission line of coplanar wave guide feedback Download PDFInfo
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- CN208000989U CN208000989U CN201820426636.6U CN201820426636U CN208000989U CN 208000989 U CN208000989 U CN 208000989U CN 201820426636 U CN201820426636 U CN 201820426636U CN 208000989 U CN208000989 U CN 208000989U
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- planar waveguide
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Abstract
The utility model discloses a kind of annular surface wave transmission lines of coplanar wave guide feedback, including medium substrate, two co-planar waveguides, two changeover portions and annular surface plasmon structure, described two co-planar waveguides, two changeover portions and annular surface plasmon structure setting are on the same layer of medium substrate, two co-planar waveguides and two changeover portions are to correspond, and two co-planar waveguides and two changeover portions are symmetrical arranged, each co-planar waveguide is connect by corresponding changeover portion with wherein one end of annular surface plasmon structure.The electromagnetic wave in microwave frequency transfer surface plasmon polariton modes may be implemented in the utility model, has the characteristics that simple in structure, bandwidth of operation is wide, easy to process, integrated level is high, has prodigious application value in microwave integrated circuit and communication system.
Description
Technical field
The utility model is related to a kind of transmission line, the annular surface wave transmission line of especially a kind of coplanar wave guide feedback belongs to
In integrated circuit and Surface wave technology field.
Background technology
Surface plasmons (SPP) is a kind of electromagnetic wave propagated along the interface of metal and medium, in propagation side
There is the wave number bigger than light wave upwards, be the evanescent field of exponential damping on the direction vertical with the direction of propagation, by electromagnetic field office
Limit is in sub-wavelength dimensions.Using the method for periodically having hole conductor, it can encourage and propagate in microwave and Terahertz frequency range
SPP.It is a kind of single line structure according to the surface plasmons transmission line that above method designs, the bandwidth of operation with ultra-wide,
Transmission line is moderately bent and transmission performance is constant, the high advantage of integrated level.
Co-planar waveguide (CPW), conduction band in same level, has dispersion small with ground connection floor, easy to implement compact
The advantages that balancing circuitry, the interference between signal wire and ground wire is small, the extensive use in microwave integrated circuit.So using CPW
Feed, the transmission line structure handling ease of design, integrated level are high.
According to investigations with understanding, disclosed prior art is as follows:
1) J.B.Pendry in 2004 et al. delivers entitled " Mimicking Surface Plasmons in SCIENCE
The article of with Structured Surfaces ".Author proposes in microwave and Terahertz frequency range, in the conductor ammeter for having perforation
Face is observed that surface plasmon, and carries out theory analysis to the design method of SPP, this is microwave and Terahertz
The research and application of frequency range inner surface plasmon lay the foundation.
2) 2013, Ma Huifeng et al. delivered entitled " Broadband and high-efficiency conversion
In from guided waves to spoof surface plasmon polaritons " articles, propose with copper-plated ultra-thin
Dielectric-slab makes the surface plasmons transmission line structure of fishbone.Using CPW as input/output signal, the bilateral line of rectangle
It is expeditiously converted between wave metal strip structural transmission SPP, realization SPP and conventional transmission line CPW.
Utility model content
Purpose of the utility model is to solve the defect of the above-mentioned prior art, a kind of coplanar wave guide feedback is provided
The electromagnetic wave in microwave frequency transfer surface plasmon polariton modes may be implemented in annular surface wave transmission line, the transmission line, tool
Have the characteristics that simple in structure, bandwidth of operation is wide, easy to process, integrated level is high, has in microwave integrated circuit and communication system
Prodigious application value.
The purpose of this utility model can be reached by adopting the following technical scheme that:
The annular surface wave transmission line of coplanar wave guide feedback, including medium substrate, two co-planar waveguides, two changeover portions and
Annular surface plasmon structure, described two co-planar waveguides, two changeover portions and annular surface plasmon structure are set
Set on the same layer of medium substrate, two co-planar waveguides and two changeover portions be correspond, and two co-planar waveguides and
Two changeover portions are symmetrical arranged, and each co-planar waveguide passes through its of corresponding changeover portion and annular surface plasmon structure
Middle one end connection.
As a preferred embodiment, each changeover portion include multiple annular transitional units and be located at multiple annular transitional units
The metal unit of both sides, multiple annular transitional units are connected in turn, and both ends respectively with corresponding co-planar waveguide, annular
Wherein one end of surface plasmons structure connects.
As a preferred embodiment, in each changeover portion, the multiple annular transitional unit from corresponding co-planar waveguide to
Wherein one end of annular surface plasmon structure becomes larger.
As a preferred embodiment, in each changeover portion, the metal unit is from annular transitional unit and corresponding coplanar wave
The junction led starts to be gradually distance from annular transitional unit, and in annular transitional unit and annular surface plasmon structure
Junction disappears.
As a preferred embodiment, the annular transitional unit in each changeover portion cuts into semi-circular transition element, described
Annular surface plasmon structure cuts into semi-circular surface plasmons structure, and ladder is loaded on each co-planar waveguide
Impedance structure.
As a preferred embodiment, the annular surface plasmon structure is made of multiple annular elements, Duo Gehuan
Shape unit is connected in turn according to periodic arrangement, and the size of each annular element is consistent.
As a preferred embodiment, the height of each annular element, width and fineness and adjacent two annulars
The distance between unit is adjusted according to required frequency application range.
As a preferred embodiment, described two co-planar waveguides are respectively the first co-planar waveguide and the second co-planar waveguide, institute
It is respectively First Transition section and the second changeover portion to state two changeover portions;
First co-planar waveguide and the second co-planar waveguide are symmetrical, and First Transition section and the second changeover portion are symmetrical, the
One co-planar waveguide corresponds to First Transition section, and the second co-planar waveguide corresponds to the second changeover portion, and the first co-planar waveguide passes through First Transition
Section connect with the left end of annular surface plasmon structure, the second co-planar waveguide by the second changeover portion and annular surface etc. from
The right end of sub- excimer structure connects.
The utility model has following advantageous effect compared with the existing technology:
1, co-planar waveguide and transition is respectively set in same layer the right and left of medium substrate in the transmission line of the utility model
Section, and annular surface plasmon structure is set in centre, the planar circuit structure on no metal ground is realized, electromagnetic wave exists
Changeover portion becomes the TM waves of surface plasmons from the TEM waves of co-planar waveguide, and surface wave enters annular table from changeover portion again
Face plasmon structure, each co-planar waveguide pass through corresponding changeover portion and wherein the one of annular surface plasmon structure
End has connected and composed surface wave transmission line, realizes the conversion between co-planar waveguide and annular surface plasmon structure, has
Have that bandwidth of operation is wide, there is low frequency conducting, high-frequency by the characteristics of.
2, in the transmission line of the utility model, changeover portion include multiple annular transitional units and be located at annular transitional unit two
The metal unit of side, annular transitional unit is sequentially connected, and is become larger, and metal unit is gradually distance from annular transitional unit, most
After completely disappear, annular transitional unit can according to actual use occasion variation, more transition elements, conversion it is more smooth.
3, in the transmission line of the utility model, annular surface plasmon structure by multiple same sizes annular element
Composition, the quantity of annular element can be set according to actual needs, and can be bent setting so that cabling is more flexible, Ke Yigen
It is single to the height of each annular element, width and fineness and adjacent two annulars according to required frequency application range
The distance between member is adjusted, and the geometric parameter of each annular element can control highest by frequency.
4, in the transmission line of the utility model, multiple annular transitional units in each changeover portion can be cut into semi-ring
Shape transition element, the annular surface plasmon structure cuts into semi-circular surface plasmons structure, each total
Surface wave leads loading stepped impedance structure, and stepped impedance structure can adjust co-planar waveguide and the impedance of surface plasmons reaches
To matching, simulation result show from 4GHz~11.5GHz S11 be less than -10dB, S21 is more than in 4.5GHz~7.5GHz -
1.5dB can be completed between the quasi- TEM waves on co-planar waveguide and the TM waves on surface plasmons efficiently in bandwidth of operation
Conversion.
5, the utility model can complete Efficient Conversion between conventional co-planar waveguide and surface plasmons transmission line, be
Extensive use of the surface plasmons device in microwave integrated circuit and communication system provides basis, and is easily worked,
Transmission line is moderately bent and transmission performance is constant, integrated to promoting circuit miniaturization, and the development of scale has prodigious dive
Power.
Description of the drawings
Fig. 1 is the annular surface wave transmission line structure schematic diagram of the coplanar wave guide feedback of the utility model embodiment 1.
Fig. 2 is the transmission of the annular surface wave transmission line frequency response of the coplanar wave guide feedback of the utility model embodiment 1
Efficiency curve diagram.
Fig. 3 is the semi-circular surface wave transmission line structural schematic diagram of the coplanar wave guide feedback of the utility model embodiment 2.
Fig. 4 is that whether there is or not stepped impedances for the semi-circular surface wave transmission line of coplanar wave guide feedback of the utility model embodiment 2
Frequency response efficiency of transmission curve graph.
In Fig. 1,1- medium substrates, the first co-planar waveguides of 2-, the second co-planar waveguides of 3-, 4- First Transition sections, the second mistakes of 5-
Cross section, 6- annular surface plasmon structures, the first annular transition elements of 7-, the first metal units of 8-, the first transport parts 9-
Point, 10- the second annular transitional units, the second metal units of 11-, the second transmission sections of 12-, 13- annular elements.
In Fig. 3,1- medium substrates, the first co-planar waveguides of 2-, the second co-planar waveguides of 3-, 4- First Transition sections, the second mistakes of 5-
Cross section, 6- semi-circular surface plasmons structures, 7- the first semi-circular transition elements, the first metal units of 8-, the biographies of 9- first
Defeated part, 10- the second semi-circular transition elements, the second metal units of 11-, the second transmission sections of 12-, 13- semi-circular units,
14- the first stepped impedance structures, 15- the second ladder impedance structures.
Specific implementation mode
The present invention will be further described in detail with reference to the embodiments and the accompanying drawings, but the implementation of the utility model
Mode is without being limited thereto.
Embodiment 1:
As shown in Figure 1, present embodiments providing a kind of annular surface wave transmission line of coplanar wave guide feedback, the annular surface
Wave transmission line includes medium substrate 1, the first co-planar waveguide 2, the second co-planar waveguide 3, First Transition section 4, the second changeover portion 5 and ring
Shape surface plasmons structure 6, first co-planar waveguide 2, the second co-planar waveguide 3, First Transition section 4, the second changeover portion 5
It is arranged on the same layer of medium substrate 1 with annular surface plasmon structure 6, is arranged in the present embodiment in top layer, is situated between
For the bottom of matter substrate 1 without with covering copper, medium substrate 1 preferably uses pcb board;First co-planar waveguide, 2 and second co-planar waveguide 3
Symmetrical, 4 and second changeover portion 5 of the First Transition section is symmetrical, and the first co-planar waveguide 2 and 4 phase of First Transition section
Corresponding, the second co-planar waveguide 3 is corresponding with the second changeover portion 5.
The First Transition section 4 is including multiple first annular transition elements 7 and is located at 7 liang of multiple first annular transition elements
First metal unit 8 of side;The left end of the multiple first annular transition element 7 is connect with the first co-planar waveguide 2, right end and ring
The left end of shape surface plasmons structure 6 connects, and multiple first annular transition elements 7 are from left to right sequentially connected, and gradually
Become larger, the first metal unit 8 from left to right tapers into, i.e. the connection from first annular transition element 7 and the first co-planar waveguide 2
Place starts to be gradually distance from first annular transition element 7, and in first annular transition element 7 and annular surface plasmon structure
The junction of 6 left ends disappears, and first annular transition element 7 can be according to actual use occasion variation, more first annular mistakes
Cross unit 7, conversion it is more smooth;Electromagnetic wave is in First Transition section 4 from the TEM of the first transmission section 9 of the first co-planar waveguide 2
(Transverse Electric and Magnetic Field, refer to electromagnetic wave electric field and magnetic field all perpendicular to propagation side
To plane on) wave becomes the TM (Transverse Magnetic, transversal magnetic) of annular surface plasmon structure 6
Wave, TM waves enter annular surface plasmon structure 6 from First Transition section 4, then convert back TEM waves by the second changeover portion 5
It is transferred to the second co-planar waveguide 3.
Second changeover portion 5 is including multiple second annular transitional units 10 and is located at multiple second annular transitional units 10
Second metal unit 11 of both sides;The right end of the multiple second annular transitional unit 10 is connect with the second co-planar waveguide 3, left end
It being connect with the right end of annular surface plasmon structure 6, multiple second annular transitional units 10 are sequentially connected from right to left, and
It becomes larger, the second metal unit 11 tapers into from right to left, i.e., from the second annular transitional unit 10 and the second co-planar waveguide 3
Junction start to be gradually distance from the second annular transitional unit 10, and in the second annular transitional unit 10 and annular surface plasma
The junction of 6 left end of excimer structure disappears, and similarly, the second annular transitional unit 10 can change according to actual use occasion,
The second more annular transitional units 10, conversion it is more smooth;Similarly, electromagnetic wave in the second changeover portion 5 from the second coplanar wave
The TEM waves for leading 3 the second transmission section 12 become the TM waves of annular surface plasmon structure 6, and TM waves are from the second transition
Section 5 enters annular surface plasmon structure 6, then converts back TEM waves by First Transition section 4 and be transferred to the first co-planar waveguide
2。
The annular surface plasmon structure 6 is made of multiple annular elements 13, and multiple annular elements 13 are according to week
Phase arranges, and is connected in turn, and the quantity of annular element 13 is arranged according to actual needs, the size of each annular element 13
It is consistent, and the distance between height, width and the fineness of each annular element and adjacent two annular elements, root
It is adjusted according to required frequency application range;First co-planar waveguide 2, First Transition section 4, annular surface plasmon structure
6, the second co-planar waveguide 3 and the second changeover portion 5 are sequentially connected and constitute surface wave transmission line.
As shown in Fig. 2, the transmission effect of the annular surface wave transmission line frequency response for the coplanar wave guide feedback of the present embodiment
Rate curve graph, it can be seen that realize the TM waves of the efficiently transfer surface plasmon in 2GHz~12GHz, there is work
Make with wide, easy to process advantage.
Embodiment 2:
As shown in figure 3, the annular surface wave transmission line in embodiment 1 can only be intercepted center line upper half by the present embodiment
It cuts and may make up the semi-circular surface wave transmission line of coplanar wave guide feedback, which includes medium substrate 1, the
One co-planar waveguide 2, the second co-planar waveguide 3, First Transition section 4, the second changeover portion 5 and semi-circular surface plasmons structure 6,
First co-planar waveguide 2, the second co-planar waveguide 3, First Transition section 4, the second changeover portion 5 and semi-circular surface plasmons
Structure 6 is arranged on the same layer of medium substrate 1, is arranged in the present embodiment in top layer, and the bottom of medium substrate 1 is without covering copper
Ground;First co-planar waveguide, 2 and second co-planar waveguide 3 is symmetrical, 4 and second changeover portion 5 or so of the First Transition section
Symmetrically, and the first co-planar waveguide 2 is corresponding with First Transition section 4, and the second co-planar waveguide 3 is corresponding with the second changeover portion 5.
The First Transition section 4 is including multiple first semi-circular transition elements 7 and is located at multiple first semi-circular transition lists
First metal unit 8 of first 7 both sides;The left end of the multiple first semi-circular transition element 7 is connect with the first co-planar waveguide 2,
Right end is connect with the left end of semi-circular surface plasmons structure 6, and the first semi-circular transition element 7 from left to right connects successively
It connects, and becomes larger, the first metal unit 8 from left to right tapers into, i.e., coplanar from the first semi-circular transition element 7 and first
The junction of waveguide 2 starts to be gradually distance from the first semi-circular transition element 7, and in the first semi-circular transition element 7 and semi-circular
The junction of 6 left end of surface plasmons structure disappears, and the first semi-circular transition element 7 can become according to actual use occasion
Change, the first more semi-circular transition elements 7, conversion it is more smooth;Electromagnetic wave is in First Transition section 4 from the first co-planar waveguide
The TEM waves of 2 the first transmission section 9 become the TM waves of semi-circular surface plasmons structure 6, and TM waves are from First Transition section
4 enter semi-circular surface plasmons structure 6, then convert back TEM waves by the second changeover portion 5 and be transferred to the second co-planar waveguide
3。
Second changeover portion 5 is including multiple second semi-circular transition elements 10 and is located at multiple second semi-circular transition lists
Second metal unit 11 of first 10 both sides;The right end of the multiple second semi-circular transition element 10 and the second co-planar waveguide 3 connect
It connects, left end is connect with the right end of semi-circular surface plasmons structure 6, and the second semi-circular transition element 10 is from right to left successively
Connection, and become larger, the second metal unit 11 tapers into from right to left, i.e., from the second semi-circular transition element 10 and second
The junction of co-planar waveguide 3 is gradually distance from the second semi-circular transition element 10, and in the second semi-circular transition element 10 and semi-ring
The junction of 6 left end of shape surface plasmons structure disappears, and similarly, the second semi-circular transition element 10 can be according to reality
Use occasion change, the second more semi-circular transition elements 10, conversion it is more smooth;Similarly, electromagnetic wave is in the second changeover portion 5
In become the TM of semi-circular surface plasmons structure 6 from the TEM waves of the second transmission section 12 of the second co-planar waveguide 3
Wave, TM waves enter semi-circular surface plasmons structure 6 from the second changeover portion 5, then convert back TEM by First Transition section 4
Wave is transferred to the first co-planar waveguide 2.
The semi-circular surface plasmons structure 6 is made of multiple semi-circular units 13, multiple semi-circular units 13
It according to periodic arrangement, and is connected in turn, the quantity of semi-circular unit 13 is arranged according to actual needs, each semi-circular list
The size of member 13 is consistent, and height, width and the fineness and adjacent two semi-circular lists of each semi-circular unit
The distance between member is adjusted according to required frequency application range;First co-planar waveguide 2, First Transition section 4, semi-circular
Surface plasmons structure 6, the second co-planar waveguide 3 and the second changeover portion 5 are sequentially connected and constitute surface wave transmission line.
But such semi-circular surface wave transmission line can not transfer surface plasmon TM waves, transmit line frequency
The efficiency of transmission curve of response is very poor, in order to make semi-circular transmission line reach impedance matching again, the of the first co-planar waveguide 2
One transmission section 9 loads the first stepped impedance structure 14, and the second ladder is loaded in the second transmission section 12 of the second co-planar waveguide 3
Impedance structure 15, from 4GHz~11.5GHz, S11 is less than -10dB, and S21 is more than -1.5dB in 4.5GHz~7.5GHz, in work
Make to complete efficiently to convert between the quasi- TEM waves on co-planar waveguide and the TM waves on surface plasmons in bandwidth;It is above-mentioned
The annular surface wave transmission line structure of embodiment 1 is simple and symmetrical, has the frequency much larger than semi-circular surface wave transmission line
Free transmission range, although the stepped impedance on semi-circular surface wave transmission line can adjust co-planar waveguide and surface plasmons
Impedance reaches matching, and the performance of S11 is more preferable, but bandwidth of operation narrows compared to the annular surface wave transmission line of embodiment 1.
In conclusion co-planar waveguide is respectively set in same layer the right and left of medium substrate in the transmission line of the utility model
And changeover portion, and annular surface plasmon structure is set in centre, the planar circuit structure on no metal ground is realized, electricity
Magnetic wave becomes the TM waves of surface plasmons in changeover portion from the TEM waves of co-planar waveguide, and surface wave enters from changeover portion again
Annular surface plasmon structure, each co-planar waveguide pass through corresponding changeover portion and annular surface plasmon structure
Wherein one end has connected and composed surface wave transmission line, realizes and turns between co-planar waveguide and annular surface plasmon structure
Change, have bandwidth of operation it is wide, have low frequency conducting, high-frequency by the characteristics of.
The above, only the utility model patent preferred embodiment, but the protection domain of the utility model patent is simultaneously
Not limited to this, any one skilled in the art is in the range disclosed in the utility model patent, according to this
Technical solution and its utility model design of utility model patent are subject to equivalent substitution or change, belong to the utility model patent
Protection domain.
Claims (8)
1. the annular surface wave transmission line of coplanar wave guide feedback, including medium substrate, it is characterised in that:Further include two coplanar waves
It leads, two changeover portions and annular surface plasmon structure, described two co-planar waveguides, two changeover portions and annular surface etc.
For ion excimer structure setting on the same layer of medium substrate, two co-planar waveguides and two changeover portions are one-to-one correspondence, and
Two co-planar waveguides and two changeover portions are symmetrical arranged, each co-planar waveguide by corresponding changeover portion and annular surface etc. from
Wherein one end of sub- excimer structure connects.
2. the annular surface wave transmission line of coplanar wave guide feedback according to claim 1, it is characterised in that:Each changeover portion
Metal unit including multiple annular transitional units and positioned at multiple annular transitional units both sides, multiple annular transitional units are successively
It links together, and both ends are connected with wherein one end of corresponding co-planar waveguide, annular surface plasmon structure respectively.
3. the annular surface wave transmission line of coplanar wave guide feedback according to claim 2, it is characterised in that:Each changeover portion
In, the multiple annular transitional unit is gradual to wherein one end of annular surface plasmon structure from corresponding co-planar waveguide
Become larger.
4. the annular surface wave transmission line of coplanar wave guide feedback according to claim 2, it is characterised in that:Each changeover portion
In, the metal unit is gradually distance from annular transitional unit since annular transitional unit and the junction of corresponding co-planar waveguide,
And it disappears in the junction of annular transitional unit and annular surface plasmon structure.
5. the annular surface wave transmission line of coplanar wave guide feedback according to claim 2, it is characterised in that:Each changeover portion
In annular transitional unit cut into semi-circular transition element, the annular surface plasmon structure cuts into semi-circular table
Face plasmon structure is loaded with stepped impedance structure on each co-planar waveguide.
6. according to the annular surface wave transmission line of claim 1-4 any one of them coplanar wave guide feedbacks, it is characterised in that:Institute
It states annular surface plasmon structure to be made of multiple annular elements, multiple annular elements connect successively according to periodic arrangement
It is connected together, the size of each annular element is consistent.
7. the annular surface wave transmission line of coplanar wave guide feedback according to claim 6, it is characterised in that:Each annular is single
The distance between height, width and fineness and adjacent two annular elements of member, according to required frequency application model
It encloses and is adjusted.
8. according to the annular surface wave transmission line of claim 1-4 any one of them coplanar wave guide feedbacks, it is characterised in that:Institute
It is respectively the first co-planar waveguide and the second co-planar waveguide to state two co-planar waveguides, and described two changeover portions are respectively First Transition section
With the second changeover portion;
First co-planar waveguide and the second co-planar waveguide are symmetrical, and First Transition section and the second changeover portion are symmetrical, and first is total
Surface wave leads corresponding First Transition section, and the second co-planar waveguide corresponds to the second changeover portion, the first co-planar waveguide by First Transition section with
The left end of annular surface plasmon structure connects, and the second co-planar waveguide is swashed by the second changeover portion and annular surface plasma
The right end of meta structure connects.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820426636.6U CN208000989U (en) | 2018-03-28 | 2018-03-28 | The annular surface wave transmission line of coplanar wave guide feedback |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820426636.6U CN208000989U (en) | 2018-03-28 | 2018-03-28 | The annular surface wave transmission line of coplanar wave guide feedback |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108336462A (en) * | 2018-03-28 | 2018-07-27 | 华南理工大学 | The annular surface wave transmission line of coplanar wave guide feedback |
| CN109742532A (en) * | 2019-01-30 | 2019-05-10 | 厦门大学 | A kind of symmetric periodic groove leaky-wave antenna based on artificial surface phasmon |
-
2018
- 2018-03-28 CN CN201820426636.6U patent/CN208000989U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108336462A (en) * | 2018-03-28 | 2018-07-27 | 华南理工大学 | The annular surface wave transmission line of coplanar wave guide feedback |
| WO2019184270A1 (en) * | 2018-03-28 | 2019-10-03 | 深圳大学 | Annular surface wave transmission line fed by coplanar waveguide |
| CN108336462B (en) * | 2018-03-28 | 2024-04-12 | 华南理工大学 | Coplanar waveguide feed annular surface wave transmission line |
| CN109742532A (en) * | 2019-01-30 | 2019-05-10 | 厦门大学 | A kind of symmetric periodic groove leaky-wave antenna based on artificial surface phasmon |
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