CN108039589A - The super reflective polarization converter of surface Terahertz of L-type split-ring resonator - Google Patents
The super reflective polarization converter of surface Terahertz of L-type split-ring resonator Download PDFInfo
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- CN108039589A CN108039589A CN201711009933.7A CN201711009933A CN108039589A CN 108039589 A CN108039589 A CN 108039589A CN 201711009933 A CN201711009933 A CN 201711009933A CN 108039589 A CN108039589 A CN 108039589A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/24—Polarising devices; Polarisation filters
- H01Q15/242—Polarisation converters
- H01Q15/244—Polarisation converters converting a linear polarised wave into a circular polarised wave
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/24—Polarising devices; Polarisation filters
- H01Q15/242—Polarisation converters
- H01Q15/246—Polarisation converters rotating the plane of polarisation of a linear polarised wave
- H01Q15/248—Polarisation converters rotating the plane of polarisation of a linear polarised wave using a reflecting surface, e.g. twist reflector
Abstract
The super reflective polarization converter of surface Terahertz of L-type split-ring resonator, belong to electromagnetic wave full vector transmission regulation and control device arts, the present invention includes M × N number of metal chiral construction unit positioned at top layer and the metal layer of bottom, and it is arranged at the substrate dielectric substrate between metal chiral construction unit and the metal layer of bottom, it is characterized in that, the metal chiral construction unit includes the first L-type resonance piece and the second L-type resonance piece being arranged at by orthogonal manner in square area, the vertex of first L-type resonance piece and the vertex of the second L-type resonance piece are respectively at two diagonal vertex of square；The geometry of first L-type resonance piece is made of two equal right-angled trapeziums, and two right-angled trapeziums all have 45 ° of base angles, and bevel edge overlaps, and base is mutually perpendicular to；The geometry of second L-type resonance piece is also made of two equal right-angled trapeziums, and two right-angled trapeziums all have 45 ° of base angles, and bevel edge overlaps, and base is mutually perpendicular to；The base length for forming the right-angled trapezium of the first L-type resonance piece is less than the base length for the right-angled trapezium for forming the second L-type resonance piece.
Description
Technical field
The invention belongs to electromagnetic wave full vector to transmit regulation and control device arts, refers to reflective Terahertz linear polarization
Left and right hand circular polarization device.
Background technology
THz wave is in electromagnetic spectrum between microwave and infra-red radiation, its frequency range is 0.1-10THz, in recent years
Come, as the development in Terahertz field, the extraneous demand for THz wave device are increasing, at present, based on Meta Materials
THz devices have attracted the notice of people.
The artificial electromagnetic material that Meta Materials are made of sub-wavelength cellular construction periodic arrangement, since it has some days
Extraordinary physical property not available for right material, therefore be widely used in various functions device, as sensor, Superlens,
Invisible clothes etc..It is developed so far, the development of " Meta Materials " enjoys the concern of people, the Meta Materials bag developed at present by people
Include:" left-handed material ", photonic crystal, " super magnetic material " etc..And chiral surpasses surface (Chiral Metasurface-CM) conduct
A kind of new Meta Materials, have the fine structure of horizontal sub-wavelength, it can be achieved that to electromagnetic wave phase, polarization mode, propagating mode
The flexible Effective Regulation of the characteristics such as formula.Ultra-thin super surface can substitute large-scale optical device and realize corresponding function, it is right
There is great impetus in the THz devices potentiality to be exploited of high integration.
Polarizer is passive device particularly important in electromagnetism and optical field, and antenna feeder can be controlled in antenna applications
System polarization direction, selects the polarized version consistent with satellite TV signal, and suppresses the polarized wave of other patterns, to obtain pole
Change matching, realize optimum reception.Propagation of the conversion of polarized state for research electromagnetic wave signal now is controlled to have very heavy
The meaning wanted, traditional optics thickness is big and complicated, limits the research to Terahertz frequency range, and is surpassed based on chiral
The polarizer on surface (Chiral Metasurface-CM) has the integrated level of higher, occupies less physical space, increases
Strong development of the such devices in Terahertz field, chiral structure type SRRs (Split ring resonances) is due to tool
There is the features such as electromagnetic field local enhancement and high quality factor, answered by the constituent element for being widely used as the polarizer that chiral surpasses surface
With.The present invention is based on asymmetric openings ring, has high optical rotation and negative index characteristic
Xiaojun Huang in 2014 etc. publish an article on Journal of Applied Physics, it is proposed that one
Kind U-shaped super reflection type surface multi-resonant polarizer, the polarizer can realize the cross polarization of linear polarization in three resonance points, three
A resonance point realizes the polarization conversion of circular polarisation, while can be by the conversion of left-hand circular polarization to right-handed circular polarization.2014
Jiaxin Zhao et al. propose a kind of reflective polarizer of symmetrical L-type chiral structure.The polarizer is in the horizontal direction
For the structure of rotational symmetry, and it can realize that the cross polarization conversion of linear polarization and the left-handed and polarization of right-handed circular polarization ripple turn
Change, but the efficiency of polarization conversion need to be improved, and also rest on relatively low frequency range.
The content of the invention
The technical problems to be solved by the invention be overcome the deficiencies of the prior art and provide a kind of polarization conversion it is efficient,
Insertion loss is small, simple in structure, size is small, regulation and control are convenient, the super surface of asymmetric L-type split-ring resonator easy to process
The reflective polarization converter of Terahertz.
It is the super surface Terahertz of L-type split-ring resonator that the present invention, which solves the technical solution that the technical problem uses,
Reflective polarization converter, including positioned at M × N number of metal chiral construction unit (2) of top layer and the metal layer (4) of bottom, with
And it is arranged at the substrate dielectric substrate (3) between metal chiral construction unit (2) and the metal layer (4) of bottom, it is characterised in that
The metal chiral construction unit includes the first L-type resonance piece and the second L-type being arranged at by orthogonal manner in square area
The vertex of resonance piece, the vertex of the first L-type resonance piece and the second L-type resonance piece is respectively at two diagonal tops of square
Point；
The geometry of first L-type resonance piece is made of two equal right-angled trapeziums, and two right-angled trapeziums all have one
45 ° of base angles, bevel edge overlap, and base is mutually perpendicular to；
The geometry of second L-type resonance piece is also made of two equal right-angled trapeziums, and two right-angled trapeziums all have one
A 45 ° of base angles, bevel edge overlap, and base is mutually perpendicular to；
The base length for forming the right-angled trapezium of the first L-type resonance piece is less than the right-angled trapezium for forming the second L-type resonance piece
Base length.
Further, the base length for forming the right-angled trapezium of the first L-type resonance piece is 105um, a height of 19um；Form the
The base length of the right-angled trapezium of two L-type resonance pieces is 144um, a height of 16um.
The material of the substrate dielectric substrate is PET, dielectric constant 2.43, magnetic conductivity 1, and loss tangent is
0.001。
M and N is the integer more than 10.
The vertex of L-type resonance piece alleged by the present invention refers to the intersecting point of outer rim, in other words, the intersection point on two sides in outside.
The invention has the advantages that：
1) polarizer that the present invention is combined using the unsymmetric structure and metal backing of individual layer, is polarized based on electro-magnetic cross
Coupling and F-P cavity interference effect, the magnetic field polarity effect of existing magnetic dipole excitation, also has electric dipole to swash in mechanism is rotated
Electricity field polarity effect.
2) present invention can realize the cross polarization of linear polarization and the conversion of circular polarisation in multiple crest frequency points, and have
There is very high polarization conversion efficiency, this is very huge in the application potential of Terahertz mirror antenna field and wireless communication technique
Greatly.
3) the configuration of the present invention is simple, integrated level is high, easy to process, and controllable precision is high, micro ＆ nano technology can be used to process.
4) present invention can in microwave-Terahertz-light wave frequency range flexible modulation working range, in terahertz imaging system
System, sensor, detector etc. have important application value.
Brief description of the drawings
Fig. 1 is the super reflective polarization converter of surface Terahertz of asymmetric L-type split-ring resonator provided by the invention
Three dimensional structure diagram；
Fig. 2 is metal resonant ring chiral structure and single resonant element side schematic view；
Fig. 3 is the surface current point of the super reflective polarization converter of surface Terahertz of asymmetric L-type split-ring resonator
Cloth simulation result figure.
Fig. 4 is that the reflecting spectrum of the super reflective polarization converter of surface Terahertz of asymmetric L-type split-ring resonator is imitated
True result figure.
Embodiment
The reflective polarizer of the present invention is being both vertically and horizontally unsymmetric structure, its working frequency range is too
Hertz frequency range and efficient, can realize left-handed or right-handed circular polarization linear polarization, eight resonance points in four resonance points
Efficient polarization conversion, polarization conversion efficiency are more than 99%.The polarizer has high cross polarization transfer efficiency, and ties
Structure is simple, and difficulty of processing is relatively low.
As shown in Figure 1, 2, the present invention includes signal input part/reflection output terminal 1, substrate dielectric substrate 3, top-level metallic hand
Levy construction unit 2, bottom metal layers 4, signal transmission output terminal 5.L-type metal chiral construction unit is by small one and large one two openings
Opposite L-type sheet metal is formed, and two respective adjacent sides of L-type are equal and parallel coordinate axes (X-axis and Y-axis).Metal chiral structure
Cell list surface layer resonant element is horizontally and vertically all forming unsymmetric structure relative to the plane of incidence, and in oblique line
45 ° of directions form symmetrical structure.In the L-type metal structure, the length of big L is l2, and the length of width w2, small L are l1,
Width is w1, and opening width is d between size L.L1 and l2 is hundred micron dimensions, and w1, w2 and d are ten micron dimensions.Work as polarization
When ripple is incident, hair is formed by upper strata L-type chiral structure, middle dielectric layer and bottom metal reflecting layer successively from top to bottom
Ejected wave is exported from input terminal, completes 90 ° of conversions of polarized state.
The wire member of the metal resonance structure is Au, Ag, Cu, Al or Ti/Pt/Au alloy, and thickness h is hundred nanometers
Magnitude.
The switching mechanism of the polarizer as shown in figure 3, when it is incident be the line polarization wave in y- directions when, i.e. electric field Ei poles
Change direction is y, and magnetic field polarization direction is x directions, and the CURRENT DISTRIBUTION of the metal layer of upper strata metal structure and bottom is respectively such as Fig. 3
(a), shown in 3 (b), 3 (c) and 3 (d).As shown in the figure, based on surface plasma wave electro-magnetic cross coupling mechanism and levels gold
Belong to interstructural Fabry-Perot-type cavity (Fabry Perot interferometer-FP) interference effect, upper strata electric current and lower floor
The difference of direction of current flow, so as to cause the conversion of polarized state.In crest frequency point f1=0.381THz, f2=
0.636THz, for upper and lower metal structure CURRENT DISTRIBUTION on the contrary, so as to form magnetic dipole, its direction is equal with incident direction of an electric field
OK, so as to cause cross polarization.It is and mutual for crest frequency point f3=0.891THz, the metal structure CURRENT DISTRIBUTION of levels
Vertically, electric dipole P2 and P3 are formed and excites electric field E2 and E3, it is perpendicular with incident electric field, so as to cause the rotation of polarized state
Turn.It is same for f4=1.063THz, since the component E2x of the electric field E2 of electric dipole P2 excitations causes polarization rotation.Can
To find to form the F-P cavity with interference effect between the metal structure of levels, can be adjusted by adjusting substrate thickness
The Polarization Coupling effect of lower interlayer.The same structural parameters for resonant element are adjusted, thus it is possible to vary surface plasma
The pattern distribution of bulk wave, realizes the adjustment to characteristics such as resonant frequency, Out-of-band rejection, polarization conversion efficiency, asymmetric transmissions.It is logical
Polarizer structure can be optimized by crossing theoretical calculation and analogue simulation, can be designed that the terahertz for meeting Practical Project requirement
Hereby polarized rotation device.
More specifically, the material used in dielectric substrate is Polyethylene Terephthalate (PET), dielectric is normal
Number about 2.43, magnetic conductivity 1, loss tangent is about 0.001, thickness h.The wire member of metal resonance structure is stated using electricity
Conductance is the metallic aluminium of 3.72 × 107S/m.
The structural parameters on the super surface of sign are as shown in Figure 2：A=247um, t=50um, l1=105um, l2=144um, w1
=19um, w2=16um, d=23um.
Fig. 4 show the reflective polarization converter reflection of super surface Terahertz based on asymmetric L-type split-ring resonator
Frequency spectrum simulation result figure.Simulate to obtain through three-D high frequency electromagnetic simulation software HFSS：As shown in Fig. 4 (a), when incidence is y directions
Line polarization wave when, can be with Frequency point f1=0.381THz, f2=0.636THz, f3=0.891THz, f4=1.063THz
The cross polarization of linear polarization is obtained, emission ratio | rxy | 2 be respectively 0.834,0.953,0.901 and 0.935, similarly, is such as schemed
Shown in 4 (b), it is similar in the polarization conversion efficiency (polarization conversion ratio) of this four Frequency points
1.0.Polarization rotation angle is shown in Fig. 4 (c)In tetra- crest frequency points of f1~f4,Or 180 °, it is shown to be
Line cross polarization, and in Frequency point 0.364THz, 0.402THz, 0.516THz, 0.737THz, 0.859THz, 0.926THz,
1.020THz and 1.183THz, phase difference are respectively -95.4 °, 95.3 °, -93.9 °, -88.5 °, 84.1 °, -86.7 °, -93.1 °
With 95.5 °, to have been converted into circularly polarised wave (+/- to represent left-hand circular polarization ripple and dextrorotation respectively for line polarization wave at this time for this explanation
Circularly polarised wave).Processing scheme is intended using micro-nano lithographic process technologies；Experimental program is intended using terahertz time-domain spectroscopy instrument or terahertz
Hereby vector network analyzer surveys the reflective polarizer of Terahertz of preparation, it should be noted that due to being reflective pole
Change device, it is necessary to make incidence wave direction and back wave direction deviate certain angle, in order to test.Consider since base material electricity is joined
The measurement error that number, metal material conductivity, machining accuracy and measuring apparatus precision etc. are brought, and binding test result is to polarization
Device model carries out the performance that further engineering optimization is expected to further improve polarizer.
The super surface texture of asymmetric L-type split-ring resonator in this case, can be selected according to the difference of working frequency range
Appropriate media substrate materials and metal material are selected, are processed using different processing technologys, such as PCB technologies, ion etching
Technology, induced with laser technology or conventional lithographic techniques etc..
Claims (3)
- The super reflective polarization converter of surface Terahertz of 1.L type split-ring resonators, including M × N number of metal positioned at top layer Chiral construction unit (2) and the metal layer (4) of bottom, and it is arranged at metal chiral construction unit (2) and the metal layer of bottom (4) the substrate dielectric substrate (3) between, it is characterised in thatThe metal chiral construction unit includes the first L-type resonance piece and second being arranged at by orthogonal manner in square area The vertex of L-type resonance piece, the vertex of the first L-type resonance piece and the second L-type resonance piece be respectively at two of square it is diagonal Vertex；The geometry of first L-type resonance piece is made of two equal right-angled trapeziums, and two right-angled trapeziums all have 45 ° of bottoms Angle, bevel edge overlap, and base is mutually perpendicular to；The geometry of second L-type resonance piece is also made of two equal right-angled trapeziums, and two right-angled trapeziums all have one 45 ° Base angle, bevel edge overlap, and base is mutually perpendicular to；The base length for forming the right-angled trapezium of the first L-type resonance piece is less than the bottom for the right-angled trapezium for forming the second L-type resonance piece Edge lengths；M and N is the integer more than 10.
- 2. the super reflective polarization converter of surface Terahertz of L-type split-ring resonator as claimed in claim 1, its feature exist In,The base length for forming the right-angled trapezium of the first L-type resonance piece is 105um, a height of 19um；The base length for forming the right-angled trapezium of the second L-type resonance piece is 144um, a height of 16um.
- 3. the super reflective polarization converter of surface Terahertz of L-type split-ring resonator as claimed in claim 2, its feature exist In the material of, the substrate dielectric substrate be PET, dielectric constant 2.43, magnetic conductivity 1, loss tangent 0.001.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108736170A (en) * | 2018-08-07 | 2018-11-02 | 南京邮电大学 | A kind of super Surface Polarization converter of electromagnetism based on solid state plasma |
| CN109088170A (en) * | 2018-06-05 | 2018-12-25 | 中国人民解放军空军工程大学 | Super surface spin, wavefront controller and its design method based on principle of interference |
| CN109149120A (en) * | 2018-08-30 | 2019-01-04 | 南京信息工程大学 | A kind of any polarisation angles deflector of line polarization wave |
| CN109473785A (en) * | 2018-12-21 | 2019-03-15 | 桂林电子科技大学 | A kind of super surface narrowband polarization converter of dipole photon |
| CN109768393A (en) * | 2019-02-22 | 2019-05-17 | 重庆邮电大学 | A kind of broadband Terahertz asymmetric transmission device based on Meta Materials |
| CN109870824A (en) * | 2019-04-19 | 2019-06-11 | 桂林电子科技大学 | A kind of efficient Terahertz Meta Materials linear polarization converter |
| US20200194899A1 (en) * | 2018-06-08 | 2020-06-18 | Boe Technology Group Co., Ltd. | Adjustable polarization converter and electronic device |
| CN111896479A (en) * | 2020-09-07 | 2020-11-06 | 北京邮电大学 | Terahertz chiral discrimination device and circular polarization selector |
| CN112952378A (en) * | 2021-01-29 | 2021-06-11 | 西安交通大学 | Decoupling structure with polarization conversion characteristic for reducing cross polarization coupling |
| CN114024144A (en) * | 2021-10-08 | 2022-02-08 | 电子科技大学长三角研究院(湖州) | Multifunctional double-frequency coding super surface |
| CN115395243A (en) * | 2022-07-11 | 2022-11-25 | 西安科技大学 | Ultra-wideband polarizer applied to beam regulation |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109088170A (en) * | 2018-06-05 | 2018-12-25 | 中国人民解放军空军工程大学 | Super surface spin, wavefront controller and its design method based on principle of interference |
| CN109088170B (en) * | 2018-06-05 | 2020-06-02 | 中国人民解放军空军工程大学 | Super-surface spinning and wave-front controller based on interference principle and design method thereof |
| US11509058B2 (en) * | 2018-06-08 | 2022-11-22 | Beijing Boe Technology Development Co., Ltd. | Adjustable polarization converter and electronic device |
| US20200194899A1 (en) * | 2018-06-08 | 2020-06-18 | Boe Technology Group Co., Ltd. | Adjustable polarization converter and electronic device |
| CN108736170A (en) * | 2018-08-07 | 2018-11-02 | 南京邮电大学 | A kind of super Surface Polarization converter of electromagnetism based on solid state plasma |
| CN109149120A (en) * | 2018-08-30 | 2019-01-04 | 南京信息工程大学 | A kind of any polarisation angles deflector of line polarization wave |
| CN109149120B (en) * | 2018-08-30 | 2024-01-30 | 南京信息工程大学 | Arbitrary polarization angle deflector for linear polarized wave |
| CN109473785A (en) * | 2018-12-21 | 2019-03-15 | 桂林电子科技大学 | A kind of super surface narrowband polarization converter of dipole photon |
| CN109473785B (en) * | 2018-12-21 | 2023-09-08 | 桂林电子科技大学 | Dipole resonance super-surface narrowband polarization converter |
| CN109768393A (en) * | 2019-02-22 | 2019-05-17 | 重庆邮电大学 | A kind of broadband Terahertz asymmetric transmission device based on Meta Materials |
| CN109768393B (en) * | 2019-02-22 | 2021-11-16 | 重庆邮电大学 | Broadband terahertz asymmetric transmission device based on metamaterial |
| CN109870824A (en) * | 2019-04-19 | 2019-06-11 | 桂林电子科技大学 | A kind of efficient Terahertz Meta Materials linear polarization converter |
| CN111896479A (en) * | 2020-09-07 | 2020-11-06 | 北京邮电大学 | Terahertz chiral discrimination device and circular polarization selector |
| CN112952378B (en) * | 2021-01-29 | 2022-10-28 | 西安交通大学 | Decoupling structure with polarization conversion characteristic for reducing cross polarization coupling |
| CN112952378A (en) * | 2021-01-29 | 2021-06-11 | 西安交通大学 | Decoupling structure with polarization conversion characteristic for reducing cross polarization coupling |
| CN114024144B (en) * | 2021-10-08 | 2022-12-02 | 电子科技大学长三角研究院(湖州) | Multifunctional double-frequency coding super surface |
| CN114024144A (en) * | 2021-10-08 | 2022-02-08 | 电子科技大学长三角研究院(湖州) | Multifunctional double-frequency coding super surface |
| CN115395243A (en) * | 2022-07-11 | 2022-11-25 | 西安科技大学 | Ultra-wideband polarizer applied to beam regulation |
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