CN110190405A - A kind of Terahertz Meta Materials beam splitter - Google Patents
A kind of Terahertz Meta Materials beam splitter Download PDFInfo
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- CN110190405A CN110190405A CN201910348908.4A CN201910348908A CN110190405A CN 110190405 A CN110190405 A CN 110190405A CN 201910348908 A CN201910348908 A CN 201910348908A CN 110190405 A CN110190405 A CN 110190405A
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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
- H01Q15/14—Reflecting surfaces; Equivalent structures
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Abstract
The present invention is claimed a kind of Terahertz Meta Materials beam splitter, cellular construction be by top-level metallic band, middle dielectric layer, underlying metal board group at.The unit that stepping is 45 ° is rotated using 4, periodic arrangement constitutes 4 × 4 super surface of phase gradient.When THz wave impinges perpendicularly on array surface, electromagnetic wave is reflected into the wave that four beam energies are equal but the direction of propagation is different, and the angle of reflection of different frequent points is different.The beam splitter has the advantages that small in size, at low cost, can be applied to that Terahertz is stealthy and terahertz imaging etc..
Description
Technical field
The invention belongs to a kind of Terahertz beamsplitter technologies, specifically a kind of beam splitter based on Meta Materials.
Background technique
THz wave high-speed communication, radar and imaging etc. it is various application by researchers at home and abroad concerns,
It is wherein one of the research hotspot of Terahertz science and technology to the Effective Regulation of THz wave beam splitting.Traditionally mainly utilize phase
Position backing space technique regulates and controls THz wave, but method operation is relative complex.In recent years, large quantities of scholars utilize Meta Materials structure
THz devices are built, manipulation THz wave is made to become simpler and efficient.Two-dimensional model of the super surface as Meta Materials, is being realized
THz wave polarization conversion, polarization holding, wave beam separation etc. have wider application prospect.
Terahertz beam splitter based on Meta Materials is to obtain different angle due to introducing suitable phase gradient at interface
The deflection of wave beam may be implemented in reflected beam by generalized reflection law.
Currently, both at home and abroad Terahertz Meta Materials beam splitter for outgoing wave wave number and direction change not enough, limitation
The application of Terahertz beam splitter.And more beam splitting wave Terahertz beam splitters are relatively fewer.How to design that structure is simple, preparation
Be easy, cost is relatively low and Terahertz beam splitter easy to process, be researcher's key factor in need of consideration.
Summary of the invention
Present invention seek to address that the above problem of the prior art.Propose that a kind of structure is simple, preparation is easy, cost is relatively low
And Terahertz beam splitter easy to process.Technical scheme is as follows:
A kind of Terahertz Meta Materials beam splitter, be suitable for 0.22-0.30THz frequency range comprising four include 0 °, 45 °,
90 °, 135 ° of beam splitting structural unit, the metamaterial unit on the super surface of gradient is along the direction x, y periodic arrangement, Mei Gefen
Beam structural unit includes top-level metallic band, dielectric layer and underlying metal plate from top to bottom.Rotation step based on 4 adjacent cells
Into the phase covering for realizing 2 π for 45 ° and in one direction, thus, periodic arrangement constitutes 4 × 4 super surface of phase gradient.It should
The super surface of gradient can be used for constructing reflection-type Terahertz beam splitter, realizes four beam splitting to incidence wave and utilizes broad sense Si Nieerding
Rule can acquire angle of reflection, and angle of reflection is related with wavelength and the super surface period of gradient, after the structure for determining the super surface of gradient, change
Wavelength reflection angle can change simultaneously, i.e., different frequent points have different angles of reflection.Further, on 0.22-0.30THz,
When the super surface of THz wave vertical incidence phase gradient, electromagnetic wave be reflected into equal four beam energies but direction of propagation edge ± x,
The wave of ± y-axis, and the angle of reflection of different frequent points is different.
Further, the dielectric layer material is Duroid 5880, dielectric constant 2.3, loss tangent
Angle δ=0.02 tan, with a thickness of 0.254mm, metal layer material is gold, with a thickness of 0.0002mm.
Further, a length of 0.45mm of the band, width 0.1mm.
Further, the super surface texture unit is 2.4mm with the period, in the direction x, y periodic arrangement, 0.22-
On 0.30THz, there are two apparent valleies, show that THz wave is reflected to other directions or is absorbed in the frequency range.
Further, the super surface is in 0.22THz, and 39 ° of ≈ of angle of reflection θ r；When 0.25THz, 35 ° of ≈ of angle of reflection θ r；
When 0.30THz, 34 ° of ≈ of angle of reflection θ r.
It advantages of the present invention and has the beneficial effect that:
It is 45 ° by top-level metallic band, middle dielectric layer, bottom gold that innovative point of the invention, which is based on 4 rotation steppings,
Belong to board group at beam splitting structural unit, periodic arrangement constitutes 4 × 4 super surface of phase gradient, realizes the terahertz of incidence
Hereby wave is divided into four beams and is propagated with ± x, ± y-axis.The beam splitting of wave is not only realized on the super surface of the phase gradient of Unit 4 × 4, but also not
It is different with the angle of reflection of frequency point.It opens one's minds: being realizing more beam splitting and can control out on the basis of realizing beam splitting performance
The deflection of ejected wave.I takes following method to solve this problem: a metamaterial structure is first designed in CST, further according to
Broad sense Snell's law arranges to metamaterial structure, constitutes the super surface of gradient.The super surface texture size of the gradient
It is relatively large, it is easy to process, meanwhile, there are many advantages such as simple, ingenious in design, the outstanding practicability of structure, be suitble to extensive
Promote and apply, Terahertz it is stealthy and in terms of the beam splitter that has very big application prospect, and design here
Road is opened for device miniaturization and the system integration.
Detailed description of the invention
Fig. 1 is that the present invention provides the cellular construction schematic diagram on the super surface of preferred embodiment；Figure 1A indicates top level diagram, Tu1BBiao
Show side view；
4 × 4 super surface of unit phase gradient Fig. 2；
The reflection coefficient curve of the x polarized wave incidence on the super surface Fig. 3；Fig. 3 A indicates co-polarization stickogram, Fig. 3 B table
Show cross polarization stickogram；
Fig. 4 f=0.30THz, when vertical incidence the THz wave on super surface reflect far field three-dimensional figure；Fig. 4 A indicates side view
Figure, Fig. 4 B indicate top view；
Fig. 5 f=0.30THz, when vertical incidence the THz wave on super surface reflect far field X-Y scheme；
Cartesian figure when the super surface of Fig. 6 0.22THz wave vertical incidence；
Cartesian figure when the super surface of Fig. 7 0.25THz wave vertical incidence；
Cartesian figure when the super surface of Fig. 8 0.30THz wave vertical incidence；
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, detailed
Carefully describe.Described embodiment is only a part of the embodiments of the present invention.
The technical solution that the present invention solves above-mentioned technical problem is:
Terahertz Meta Materials beam splitter of the invention is as shown in Fig. 2, beam splitter includes that dielectric layer and the dielectric layer are upper and lower
The Meta Materials of the sub-wavelength metal array depended on, the array of sub-wavelength metal layer include the different structure list of four strip directions
Member, each unit are top-level metallic stripe cell as shown in Figure 1, the phase gradient for devising 4 × 4 based on cellular construction surpasses
Surface constructs the beam splitting of reflection-type Terahertz beam splitter.In 0.22-0.30THz frequency range, when THz wave impinges perpendicularly on super table
When face, electromagnetic wave is reflected into the wave that four beam energies are equal but the direction of propagation is different, and the angle of reflection of different frequent points is different.One
The Terahertz Meta Materials beam splitter of more beam splitting, outgoing wave direction-agile that kind is suitable for.
Fig. 2 show Terahertz Meta Materials beam splitter planar structure schematic diagram.Beam splitter includes four strip direction differences
Structural unit.
The present embodiment 1 is illustrated for x, the direction y periodic arrangement with super surface texture unit with 2.4mm array, knot
Structure unit is made of dielectric layer and upper and lower metal layer, and upper layer metal is strip-type, and lower layer is metal plate.
The dielectric layer material is Duroid 5880, with a thickness of 0.254mm.
The metal layer material is metallic gold, with a thickness of 0.0002mm.
The a length of 0.45mm of band, width 0.1mm.
Fig. 3 is the reflection coefficient curve for implementing 4 × 4 super surfaces of unit phase gradient in example 1, in 0.22-0.30THz
On, there are two apparent valley, this explanation THz wave in the frequency range is reflected to other directions or is absorbed.
Fig. 4 and Fig. 5 is far-field pattern of super surface under the conditions of 0.30THz vertical incidence.As can be seen from the figure incidence wave
It is the wave that four beam energies are equal, the direction of propagation is different by abnormal reflection, four beam waves are located at ± x, ± y-axis.
Cartesian figure when Fig. 6,7,8 are the super surface of 0.22THz, 0.25THz, 0.30THz wave vertical incidence respectively.
It is the angle of reflection of the frequency point wave beam corresponding to dotted line in figure, it can be seen that the super surface is in 0.22THz, θr≈39°；
When 0.25THz, θr≈35°；When 0.30THz, θr≈34°。
The above embodiment is interpreted as being merely to illustrate the present invention rather than limit the scope of the invention.?
After the content for having read record of the invention, technical staff can be made various changes or modifications the present invention, these equivalent changes
Change and modification equally falls into the scope of the claims in the present invention.
Claims (6)
1. a kind of Terahertz Meta Materials beam splitter is suitable for 0.22-0.30THz frequency range.It is characterised in that it includes 0 °, 45 °,
90 °, 135 ° of beam splitting structural unit, the metamaterial unit on the super surface of gradient is along the direction x, y periodic arrangement, Mei Gefen
Beam structural unit includes top-level metallic band, dielectric layer and underlying metal plate, the rotation step based on 4 adjacent cells from top to bottom
Into the phase covering for realizing 2 π for 45 ° and in one direction, thus, periodic arrangement constitutes 4 × 4 super surface of phase gradient, this
The super surface of gradient can be used for constructing reflection-type Terahertz beam splitter, realizes four beam splitting to incidence wave and utilizes broad sense Si Nieerding
Rule can acquire angle of reflection, and angle of reflection is related with wavelength and the super surface period of gradient, after the structure for determining the super surface of gradient, change
Wavelength reflection angle can change simultaneously, i.e., different frequent points have different angles of reflection.
2. Terahertz Meta Materials beam splitter according to claim 1, which is characterized in that on 0.22-0.30THz, when too
When Hertz wave impinges perpendicularly on 4 × 4 phase gradient super surface, electromagnetic wave be reflected into that four beam energies are equal but the direction of propagation not
Same wave, and the angle of reflection of different frequent points is different.
3. Terahertz Meta Materials beam splitter described in one of -2 according to claim 1, which is characterized in that the dielectric layer material is
Duroid 5880, dielectric constant 2.3, loss tangent angle δ=0.02 tan, with a thickness of 0.254mm, metal layer material
Material is gold, with a thickness of 0.0002mm.
4. Terahertz Meta Materials beam splitter described in one of -2 according to claim 1, which is characterized in that the band is a length of
0.45mm, width 0.1mm.
5. Terahertz Meta Materials beam splitter described in one of -2 according to claim 1, which is characterized in that the super surface texture list
Member is 2.4mm with the period, and in the direction x, y periodic arrangement, 0.22-0.30THz, there are two apparent valleies, is shown at this
THz wave is reflected to other directions or is absorbed in frequency range.
6. Terahertz Meta Materials beam splitter according to claim 5, which is characterized in that the super surface in 0.22THz,
39 ° of ≈ of angle of reflection θ r；When 0.25THz, 35 ° of ≈ of angle of reflection θ r；When 0.30THz, 34 ° of ≈ of angle of reflection θ r.
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Cited By (6)
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| CN111427171A (en) * | 2020-04-08 | 2020-07-17 | 电子科技大学 | Dual-mode terahertz wave beam modulator based on dielectric super-surface, method and application |
| CN111755791A (en) * | 2020-07-06 | 2020-10-09 | 重庆邮电大学 | Terahertz wave splitter based on metamaterial and applied to 6G wavelength division multiplexing system |
| 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 |
| CN113113777A (en) * | 2021-04-13 | 2021-07-13 | 中国人民解放军空军工程大学 | Broadband artificial surface plasmon coupler based on double-geometric phase gradient combination |
| CN113346248A (en) * | 2021-04-16 | 2021-09-03 | 上海大学 | Terahertz wave beam scanning super-surface device, wave beam scanning antenna, system and method |
| CN114512816A (en) * | 2022-03-01 | 2022-05-17 | 电子科技大学 | High-efficiency reflective terahertz wave beam deflection device |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111427171A (en) * | 2020-04-08 | 2020-07-17 | 电子科技大学 | Dual-mode terahertz wave beam modulator based on dielectric super-surface, method and application |
| CN111427171B (en) * | 2020-04-08 | 2021-07-09 | 电子科技大学 | Dual-mode terahertz wave beam modulator based on dielectric super-surface, method and application |
| CN111755791A (en) * | 2020-07-06 | 2020-10-09 | 重庆邮电大学 | Terahertz wave splitter based on metamaterial and applied to 6G wavelength division multiplexing system |
| 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 |
| CN113113777A (en) * | 2021-04-13 | 2021-07-13 | 中国人民解放军空军工程大学 | Broadband artificial surface plasmon coupler based on double-geometric phase gradient combination |
| CN113113777B (en) * | 2021-04-13 | 2023-01-17 | 中国人民解放军空军工程大学 | Broadband artificial surface plasmon coupler based on double-geometric phase gradient combination |
| CN113346248A (en) * | 2021-04-16 | 2021-09-03 | 上海大学 | Terahertz wave beam scanning super-surface device, wave beam scanning antenna, system and method |
| CN114512816A (en) * | 2022-03-01 | 2022-05-17 | 电子科技大学 | High-efficiency reflective terahertz wave beam deflection device |
| CN114512816B (en) * | 2022-03-01 | 2023-04-18 | 电子科技大学 | High-efficiency reflective terahertz wave beam deflection device |
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