CN110416737A - A kind of super surface beam splitter of Terahertz - Google Patents
A kind of super surface beam splitter of Terahertz Download PDFInfo
- Publication number
- CN110416737A CN110416737A CN201910676183.1A CN201910676183A CN110416737A CN 110416737 A CN110416737 A CN 110416737A CN 201910676183 A CN201910676183 A CN 201910676183A CN 110416737 A CN110416737 A CN 110416737A
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- super surface
- beam splitter
- terahertz
- metal layer
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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
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
- H01Q15/0026—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective said selective devices having a stacked geometry or having multiple layers
-
- 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
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0086—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices having materials with a synthesized negative refractive index, e.g. metamaterials or left-handed materials
-
- 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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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
The present invention provides a kind of super surface beam splitter of Terahertz, including several metamaterial units, the metamaterial unit includes bottom metal layer, dielectric layer and top layer metallic layer, and bottom metal layer is all-metal layer, and top layer metallic layer has " I " type pierced pattern；The metamaterial unit is in the direction x and/or the direction y periodic arrangement.Using 0 °, 45 °, 90 °, 135 ° of four metamaterial units that stepping is 45 ° is rotated, 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 approximately 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, easy to process, can be applied to that Terahertz is stealthy and terahertz imaging etc..
Description
Technical field
The present invention relates to Terahertz beam splitting technical field, specifically a kind of beam splitter based on super surface.
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, wave beam separation etc. have wider application prospect.
Terahertz beam splitter based on super surface 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 current more beam splitting wave Terahertz beam splitters are relatively fewer.How to design structure it is simple,
Preparation is easy, cost is relatively low and Terahertz beam splitter easy to process, is researcher's key factor in need of consideration.
Summary of the invention
The present invention, which is directed to, to set out in existing shortage applied to deficiency present in communication, the Terahertz beam splitter being imaged,
Aim to solve the problem that the above prior art problem, propose a kind of structure it is simple, it is easy to process and be suitable for 0.18-0.30THz frequency range
More beam splitting, outgoing wave direction-agile the super surface beam splitter of Terahertz.
Realize it is of the invention the technical solution adopted is that: a kind of super surface beam splitter of Terahertz, including several Meta Materials lists
Member, the metamaterial unit include bottom metal layer, dielectric layer and top layer metallic layer, and bottom metal layer is all-metal layer, top layer
Metal layer has " I " type pierced pattern；The metamaterial unit is specially adjacent in the direction x and/or the direction y periodic arrangement
" I " type pierced pattern rotation stepping of metamaterial unit is 45 °.
In consideration of it, designing one using 0 °, 45 °, 90 °, 135 ° of four metamaterial units in one embodiment of the invention
Cell array, when the direction x and the direction y are all 45 ° of arrangements by adjacent cells rotation stepping, and the direction x and the direction y all meet 2 π's
When phase covers, 4 × 4 super surface of phase gradient is devised, a reflection-type Terahertz beam splitter is constructed.Utilize this alunite of broad sense
Your reflection law carries out theory analysis and calculates, available in 0.18THz, θr≈37°；When 0.21THz, θr≈30°；
When 0.27THz, θr24 ° of ≈, it can be seen that in working frequency range, with the increase of frequency, angle of reflection can reduce.
One embodiment of the invention is split the THz wave of linear polarization, and line polarization wave can be regarded as with phase derotation
The circular polarisation wave beam of tropism is propagated in same direction.It is general using off-axis configuration in order to eliminate the influence of non-conversion light beam
Linear polarization topology can be generated by the coherent superposition of two planes.Here key point is to generate a phase outline, In
Under circularly polarized light irradiation, the off-axial beam of a pair of of central symmetry distribution can be generated simultaneously.Meanwhile also utilizing reflection plasma
The latest developments in body surface face, dielectric layer is clipped between structured metal layer and ground metal layer.
Further, the dielectric layer material is Duroid 5880, dielectric constant 2.3, loss tangent angle tan
δ=0.02, with a thickness of 0.254mm.The metal layer material is metallic copper.
In one embodiment of the invention, the metamaterial unit is 2.8mm with the period, in the direction x, y periodic arrangement,
On 0.18-0.30THz, there are two apparent valleies, show that THz wave is reflected to other directions or is inhaled in the frequency range
It receives.
In one embodiment of the invention, " I " type hollow out the metal pattern w=0.100mm, l=0.320mm, g=
0.200mm。
When THz wave impinges perpendicularly on above-mentioned super surface, THz wave be reflected into four beam energies it is approximately equal but pass
The different wave in direction is broadcast, and the angle of reflection of THz wave different frequent points is different.
A technical solution in above-mentioned technical proposal have the following advantages that or the utility model has the advantages that structure it is simple, it is easy to implement,
It is ingenious in design flexible, it is suitble to large-scale promotion application.
Another technical solution in above-mentioned technical proposal have the following advantages that or the utility model has the advantages that
It is realized using the super surface of the phase gradient of the composite structure of top layer " I " type metal pattern, dielectric layer, underlying metal plate
More beam splitting of THz wave, so that outgoing beam deflects.Surpass in surface texture at this, the phase shift between adjacent cells is Δ
Φ=pi/2, it is β=π/4 that top-level metallic pattern, which rotates angle, and the phase shift of 2 π can be realized by four units.Using 0 °, 45 °,
90 °, 135 ° of four metamaterial units, devise the cell array of Fig. 3, when x-axis and y-axis are all by adjacent cells rotation stepping
45 ° of arrangements, and when laterally or longitudinally all meeting the phase covering of 2 π, devise 4 × 4 super surface of phase gradient, building is a
Reflection-type Terahertz beam splitter.Incident THz wave can be reflected into the approximately equal wave of four beam energies by it, and in difference
Frequency point has different angles of reflection.
Another technical solution in above-mentioned technical proposal first designs a metamaterial structure in CST, further according to broad sense
Snell's law arranges to metamaterial structure, constitutes the super surface of gradient.Suitable phase gradient is introduced at interface
The reflected beam of available different angle.It can control the deflection of outgoing wave on the basis of realizing more beam splitting performances.
The beam splitter in another technical solution in above-mentioned technical proposal has that structure is simple, thickness is than relatively thin, is convenient for
Processing, many advantages such as ingenious in design, are suitble to large-scale promotion application, Terahertz it is stealthy and in terms of have very
Big application prospect, and the beam splitter designed here is that device miniaturization and the system integration open road.
Detailed description of the invention
Fig. 1 THz wave irradiates the beam splitting schematic diagram on super surface；
The cellular construction schematic diagram of Fig. 2 Meta Materials；
The cell array figure on the super surface Fig. 3；
Fig. 4 reflectivity simulation result diagram；
THz wave when the super surface of Fig. 5 vertical incidence reflects far field schematic diagram；
Flute when the super surface of Fig. 6 (a) f=0.18THz (b) f=0.21THz (c) f=0.27THz frequency wave vertical incidence
Karr figure；
Specific embodiment
With reference to the attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, detailed
Ground description.Described embodiment is only a part of the embodiments of the present invention.
The beam splitting schematic diagram of the super surface beam splitter of Terahertz of the invention as shown in Figure 1, in 0.18-0.30THz frequency range, when
When THz wave impinges perpendicularly on super surface, electromagnetic wave is reflected into the wave that four beam energies are approximately equal but the direction of propagation is different,
And the angle of reflection of different frequent points is different.The beam splitter includes several metamaterial modular constructions, and metamaterial unit includes medium
The two metal layers that layer and the dielectric layer depend on above and below, bottom metal layer are all-metal layer, and top layer metallic layer has " I " type
Pierced pattern, as shown in Figure 2.
Fig. 3 show the cell array of the super surface beam splitter of Terahertz.Utilize " I " type center line with a vertical
0 °, 45 °, 90 °, 135 ° of four metamaterial units, devise the cell array of Fig. 3, when x-axis and y-axis all press adjacent cells rotation
Turn stepping be 45 ° arrangement, and laterally or longitudinally all meet 2 π phase covering when, devise 4 × 4 super surface of phase gradient,
Construct a reflection-type Terahertz beam splitter.This is a kind of super surface of the Terahertz suitable for more beam splitting, outgoing wave direction-agile
Beam splitter.
The present embodiment 1 is illustrated for x, the direction y periodic arrangement with super surface texture unit with 2.8mm array, knot
Structure unit is made of dielectric layer and upper and lower metal layer, and upper layer metal is " I " type pattern, and lower layer is metal plate.
The dielectric layer material is Du Laote evanohm 5880, with a thickness of 0.254mm.
The metal layer material is metallic copper, with a thickness of 0.002mm.
The w=0.100mm, l=0.320mm, g=0.200mm of " I " the type pattern.
Fig. 4 is the reflectance curve for implementing 4 × 4 super surfaces of unit phase gradient in example 1, on 0.18-0.30THz,
There are two apparent valley, this explanation THz wave in the frequency range is reflected to other directions or is absorbed.
Terahertz reflection far field schematic diagram when Fig. 5 is vertical incidence super surface.As can be seen from the figure incidence wave is different
Abnormal reflections is the wave that four beam energies are equal, the direction of propagation is different, and four beam waves are located at ± x, ± y-axis.
Flute when Fig. 6 is f=0.18THz, f=0.21THz and f=0.27THz different frequency wave vertical incidence super surface
Karr figure.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 0.18THz, θr≈
48°；When 0.21THz, θr≈38°；When 0.27THz, θr≈32°.There are slight deviations with notional result.But with the increasing of frequency
Greatly, angle of reflection can reduce frequency, almost the same with theory, while demonstrate generalized reflection law.
The above embodiment is interpreted as being merely to illustrate the present invention rather than limit the scope of the invention.In
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 (9)
1. a kind of super surface beam splitter of Terahertz, it is characterised in that: including several metamaterial units, the metamaterial unit includes
Bottom metal layer, dielectric layer and top layer metallic layer, bottom metal layer are all-metal layer, and top layer metallic layer has " I " type hollow out figure
Case；The metamaterial unit is in the direction x and/or the direction y periodic arrangement.
2. the super surface beam splitter of a kind of Terahertz according to claim 1, it is characterised in that: the periodic arrangement is adjacent
" I " type pierced pattern rotation stepping of metamaterial unit is 45 °.
3. the super surface beam splitter of a kind of Terahertz according to claim 2, it is characterised in that: the direction x and/or the direction y
The metamaterial unit of periodic arrangement meets the phase covering of 2 π.
4. the super surface beam splitter of a kind of Terahertz according to claim 1, it is characterised in that: the dielectric layer material is Du's labor
Special chromium alloyed steel 5880, dielectric constant 2.3, loss tangent angle δ=0.02 tan.
5. the super surface beam splitter of a kind of Terahertz according to claim 1, it is characterised in that: the bottom metal layer and top layer
Metal layer material is copper.
6. any one of -5 a kind of super surface beam splitter of Terahertz according to claim 1, it is characterised in that: when THz wave hangs down
When being directly incident on super surface, THz wave is reflected into the back wave that four beam energies are approximately equal but the direction of propagation is different.
7. the super surface beam splitter of a kind of Terahertz according to claim 6, it is characterised in that: the frequency of the THz wave is not
Together, the angle of reflection of back wave is also different.
8. the super surface beam splitter of a kind of Terahertz according to claim 7, it is characterised in that: the back wave is located at ±
On x and the direction ± y.
9. any one of -5 a kind of super surface beam splitter of Terahertz according to claim 1, it is characterised in that: " I " type is engraved
W=0.100mm in null pattern, l=0.320mm, g=0.200mm.
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| CN201910676183.1A CN110416737A (en) | 2019-07-25 | 2019-07-25 | A kind of super surface beam splitter of Terahertz |
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Cited By (10)
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|---|---|---|---|---|
| CN110779456A (en) * | 2019-11-08 | 2020-02-11 | 桂林电子科技大学 | Terahertz waveband super-surface phase shift device and measuring method thereof |
| 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 |
| CN111695211A (en) * | 2020-05-20 | 2020-09-22 | 哈尔滨工程大学 | Super-surface design method |
| 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 |
| CN112525095A (en) * | 2020-11-25 | 2021-03-19 | 重庆大学 | Method for realizing super-surface biaxial strain sensing by utilizing polarization-phase-deformation relation |
| CN112736479A (en) * | 2020-12-21 | 2021-04-30 | 电子科技大学 | Broadband and wide-angle RCS (polarization switching) reduced polarization conversion composite super-surface structure |
| CN112886261A (en) * | 2021-01-12 | 2021-06-01 | 之江实验室 | Adjustable multi-angle terahertz wave beam splitter and method thereof |
| CN113131219A (en) * | 2021-04-06 | 2021-07-16 | 南京邮电大学 | 1-bit terahertz liquid crystal super surface with low side lobe |
| CN113363727A (en) * | 2021-04-16 | 2021-09-07 | 上海大学 | Terahertz wave beam scanning-polarization composite regulation and control device and antenna |
| 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 (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110779456A (en) * | 2019-11-08 | 2020-02-11 | 桂林电子科技大学 | Terahertz waveband super-surface phase shift device and measuring method thereof |
| 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 |
| CN111695211B (en) * | 2020-05-20 | 2021-06-22 | 哈尔滨工程大学 | Super-surface design method |
| CN111695211A (en) * | 2020-05-20 | 2020-09-22 | 哈尔滨工程大学 | Super-surface design method |
| 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 |
| CN112525095A (en) * | 2020-11-25 | 2021-03-19 | 重庆大学 | Method for realizing super-surface biaxial strain sensing by utilizing polarization-phase-deformation relation |
| CN112736479A (en) * | 2020-12-21 | 2021-04-30 | 电子科技大学 | Broadband and wide-angle RCS (polarization switching) reduced polarization conversion composite super-surface structure |
| CN112736479B (en) * | 2020-12-21 | 2021-10-26 | 电子科技大学 | Broadband and wide-angle RCS (polarization switching) reduced polarization conversion composite super-surface structure |
| CN112886261A (en) * | 2021-01-12 | 2021-06-01 | 之江实验室 | Adjustable multi-angle terahertz wave beam splitter and method thereof |
| CN112886261B (en) * | 2021-01-12 | 2022-06-17 | 之江实验室 | Adjustable multi-angle terahertz wave beam splitter and method thereof |
| CN113131219A (en) * | 2021-04-06 | 2021-07-16 | 南京邮电大学 | 1-bit terahertz liquid crystal super surface with low side lobe |
| CN113131219B (en) * | 2021-04-06 | 2024-01-23 | 南京邮电大学 | 1-bit terahertz liquid crystal super-surface with low side lobes |
| CN113363727A (en) * | 2021-04-16 | 2021-09-07 | 上海大学 | Terahertz wave beam scanning-polarization composite regulation and control device and antenna |
| CN113363727B (en) * | 2021-04-16 | 2022-09-02 | 上海大学 | Terahertz wave beam scanning-polarization composite regulation and control device and antenna |
| 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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