CN110120595A - The super surface of graphene that spin angular momentaum deflects on three-dimensional - Google Patents
The super surface of graphene that spin angular momentaum deflects on three-dimensional Download PDFInfo
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- CN110120595A CN110120595A CN201810119856.9A CN201810119856A CN110120595A CN 110120595 A CN110120595 A CN 110120595A CN 201810119856 A CN201810119856 A CN 201810119856A CN 110120595 A CN110120595 A CN 110120595A
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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
- H01Q15/145—Reflecting surfaces; Equivalent structures comprising a plurality of reflecting particles, e.g. radar chaff
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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
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Abstract
The present invention discloses a kind of super surface of graphene of deflection of the spin angular momentaum on three-dimensional, the super surface of the graphene is rearranged by the graphene reflector element of N*N unit of quantity, each graphene reflector element includes the graphene patch, the quartz medium plate of middle layer and the metal floor of bottom of top layer；The center position of quartz medium plate upper surface is arranged in graphene patch, and it is θ that the rotation angle of quartz medium plate upper surface, which is arranged in, in graphene patch, the lower surface of quartz medium plate is arranged in metal floor, the central point of graphene patch is overlapped with the central point of quartz medium plate, and wherein θ is any angle within the scope of -90 °~90 °；The rotation angle, θ that quartz medium plate upper surface is arranged in the graphene patch of each graphene unit surpasses the reflected phase distribution at each position in surface by graphene to determine.The super surface of graphene of the present invention can control spin angular momentaum of the electromagnetic wave on three-dimensional and deflection direction.
Description
Technical field
The present invention relates to the technical fields of microwave communication, more particularly to one kind is for spin angular momentaum deflection on three-dimensional
The super surface of graphene.
Background technique
Spin angular momentaum (SAM) is the momentum of the rotation status of a characterization electromagnetic wave, it and polarization of electromagnetic wave state
It is related.Polarization of electromagnetic wave state is different, can be used to carry different information, can be used for beamsplitters and carry out wave beam
Separation etc., therefore the SAM of electromagnetic wave how is effectively manipulated also by more and more focus of attention.In order to efficiently control SAM, reflect
The precise manipulation of the compensated stage at interface be it is essential, but it is existing Terahertz (THz) frequency range be used to control SAM's
Device, the golden material used mostly, this material construction is higher, and with common metal unit style for if, since metal is in height
The skin effect of frequent section, current convergence cause current distribution inequality that overall impedance is caused to increase on metal unit surface, produce
Life is compared with lossy.
Summary of the invention
In order to solve above-mentioned technological deficiency, the main purpose of the present invention is to provide one kind for spin angle on three-dimensional
The super surface of graphene of momentum deflection can control spin angular momentaum of the electromagnetic wave on three-dimensional and deflection direction
System, it is intended to solve in the prior art the super surface of metal because current distribution inequality cause cell impedance increase due to make entire metal surpass
The high technical problem of surface loss.
To achieve the above object, the graphene that spin angular momentaum that the present invention provides a kind of on three-dimensional deflects is super
Surface, the super surface of the graphene are rearranged by the graphene reflector element of N*N unit of quantity, and the reflection of each graphene is single
Member forms rectangular parallelepiped structure by three-decker, each graphene reflector element includes the graphene patch of top layer, centre
The quartz medium plate of layer and the metal floor of bottom；
The center position of quartz medium plate upper surface is arranged in the graphene patch, and graphene patch is arranged in stone
The rotation angle of English dielectric-slab upper surface is θ, and the lower surface of quartz medium plate, the graphene patch is arranged in the metal floor
The central point of piece is overlapped with the central point of quartz medium plate, wherein the rotation angle, θ is random angle within the scope of -90 °~90 °
Degree；
The rotation angle, θ of quartz medium plate upper surface is arranged in by the stone in the graphene patch of each graphene unit
Reflected phase at each position in the black super surface of alkene is distributed the reflected phase to determine, at each position in the super surface of graphene
Distribution is calculated by following formula:
Φ (x, y)=Φ0(x,y)-k0Sin θ ' (xcos γ+ysin γ), wherein θ=Φ (x, y)/2
Wherein in upper two formula, Φ (x, y) is the reflected phase of graphene reflector element, k0For the wave number in free space,
Φ0(x, y) is the initial phase of graphene reflector element, and θ ' is the angle of electromagnetic wave projection in the two-dimensional direction and X-axis, x
It is respectively abscissa, the ordinate in the position coordinates of each graphene reflector element with y, θ is each graphene patch in stone
Rotation angle on black alkene unit, γ be electromagnetic wave on three-dimensional with the angle of Z axis.
Preferably, the graphene patch is rectangle, and the quartz medium plate and metal floor are a kind of upper and lower surface
The rectangular parallelepiped structure being square.
Preferably, the dimensional parameters of the graphene reflector element are as follows: the length of the graphene patch is
13.39um, width 3.2um；The side length of the quartz medium plate is 14um, with a thickness of 26um；The side length of the metal floor
For 14um, with a thickness of 1um.
Preferably, the working frequency on the super surface of the graphene is the Terahertz frequency range of 1.36~1.62THz frequency range.
Preferably, when the graphene patch works in the low Terahertz frequency range for being less than 10THz frequency, in low Terahertz
Conductivity in frequency range is by band internal conductance rate σintraIt determines, and is calculated by following formula:
J is imaginary unit, and e is unit charge, kBFor Boltzmann constant,It is reduced Planck constant, T is room temperature, Γ
It is graphene scattered power, τ is the relaxation time, and ω is angular frequency, μcFor chemical potential.
Preferably, wherein T is 300K, chemical potential μc=0.64eV, relaxation time τ=14.6ps, graphene patch dissipate
Penetrating rate is Γ=1/ (2 τ).
Preferably, the super surface of the graphene is rearranged by the graphene reflector element of 51*51 unit of quantity, the stone
The surface size on the black super surface of alkene is 714um*714um.
Preferably, the mutual seamless graphene for being arranged to make up rectangular parallelepiped structure is super between each graphene reflector element
Surface.
Compared to the prior art, the present invention proposes the graphene reflector element of new parameter structure and utilizes this graphene anti-
The super surface of graphene for penetrating building unit can correspond to the spin angle being able to achieve on two-dimensional directional used in Terahertz frequency range electromagnetic wave
The deflection direction of momentum and back wave is controlled, and also be can be realized and is realized same polarization conversion to any circularly polarised wave, and existing
Compared to the super surface using usually golden material in technology, have structure simple, the advantages that surface loss is small, moderate cost.
Detailed description of the invention
Fig. 1 is stereochemical structure signal of the present invention for the super surface of graphene of spin angular momentaum deflection on three-dimensional
Figure；
Fig. 2 is the structural schematic diagram for constituting the single graphene reflector element on the super surface of graphene；
Fig. 3 is that the angle of graphene patch in graphene reflector element rotates schematic diagram；
Fig. 4 is the simulation model schematic diagram that graphene reflector element is established using HFSS simulation software；
Fig. 5 is the reflected phase of graphene reflector element and the curve synoptic diagram of reflection amplitudes；
Fig. 6 is the top view of all graphene reflector elements distribution in the super surface of graphene；
Fig. 7 is that the graphene patch on the super surface of graphene rotates angle distribution map；
Fig. 8 is the normalization antenna pattern on the super surface of graphene that spin angular momentaum deflects on three-dimensional.
The object of the invention is realized, functional characteristics and advantage will will join together in specific embodiment part in conjunction with the embodiments
It is described further according to attached drawing.
Specific embodiment
Further to illustrate the technical means and efficacy of the invention taken to reach above-mentioned purpose, below in conjunction with attached drawing
And preferred embodiment, a specific embodiment of the invention, structure, feature and its effect are described in detail.It should be appreciated that this
Locate described specific embodiment to be only used to explain the present invention, be not intended to limit the present invention.
Refering to what is shown in Fig. 1, Fig. 1 is the vertical of the super surface of graphene that the present invention is used for that spin angular momentaum to deflect on three-dimensional
Body structural schematic diagram.In order to construct one can on three-dimensional spin angular momentaum deflect the super surface 2 of graphene, this reality
Example provides a kind of super surface 2 of graphene that the graphene reflector element 1 by 51*51 unit of quantity rearranges, the graphite
The surface size on the super surface 2 of alkene is 714um*714um.It is mutually seamless between each graphene reflector element 1 to be arranged to make up
The super surface 2 of the graphene of one rectangular parallelepiped structure；When graphene surpasses 2 working frequency f=1.5THz of surface, when a left-handed circle
When polarized wave is impinged perpendicularly on the super surface 2 of the graphene, the super surface 2 of the graphene can projection in the two-dimensional direction with
45 ° of the angle position of X-axis and on three-dimensional with electricity that an identical polarization mode is reflected on 45 ° of the angle of Z axis of direction
Magnetic wave.Therefore, this example inputs the arrangement building graphite of graphene reflector element 1 of 51*51 unit of quantity from input unit 103
The super surface 2 of alkene, the abscissa positions of the arrangement position of each graphene reflector element 1 and ordinate position are indicated with x and y.
The present invention proposes a kind of super surface 2 of the graphene of reflection-type, it is by a certain number of 1 (ginsengs of graphene reflector element
Examine Fig. 2) constitute.By calculating the reflected phase needed at the graphene reflector element 1 on each position, and according to this point
The super surface 2 of the graphene that cloth rule constructs, it will be able to reflect the electromagnetic wave of an identical polarization mode in vertical direction.
The invention proposes a kind of graphene reflector elements 1 to be made each by combining Pancharatnam-Berry (PB) phase method
The condition that it is 180 to the phase difference of x polarized wave and y polarized wave that unit, which meets, when a left or right rotation circularly polarised wave vertically swashs
When encouraging the super surface of design, which can enable the wave beam with SAM deflect to the direction of any desired.
Refering to what is shown in Fig. 2, Fig. 2 is the structural schematic diagram for constituting the single graphene reflector element on the super surface of graphene.?
In the present embodiment, the rectangular parallelepiped structure that the graphene reflector element 1 is made of three-decker, the graphene patch including top layer
The metal floor 13 of piece 11, the quartz medium plate 12 of middle layer and bottom.The graphene patch 11 is arranged in quartz medium
The center position of 12 upper surface of plate, and it is θ that the rotation angle of 12 upper surface of quartz medium plate, which is arranged in, in graphene patch 11
(angle i.e. between the long side of graphene patch 11 and three dimensional space coordinate axis X-axis is θ), the setting of metal floor 13 are situated between in quartz
The lower surface of scutum 12.Wherein, θ is any angle within the scope of -90 °~90 °.The central point and quartz medium of graphene patch 11
The central point of plate 12 is overlapped, and the rotation angle, θ that 12 upper surface of quartz medium plate is arranged in graphene patch 11 is all around this
Central point carries out rotation formation.As a preferred embodiment, the actual size parameter of the graphene reflector element 1 is as follows: stone
Black alkene patch 11 is rectangle, and the length a of the graphene patch 11 is 13.39um, width b is 3.2um；Quartz medium plate 12 is one
The rectangular parallelepiped structure that kind of upper and lower surface is square, the side length s of the quartz medium plate 12 is 14um, thickness h 26um；Metal
Floor 13 is a kind of rectangular parallelepiped structure that upper and lower surface is square, the side length s of the metal floor 13 be 14um, with a thickness of
1um, metal floor 13 are metallic copper.
Since the different conductivity of graphene will have a direct impact on reflected phase, it needs to consider graphene in design
The conductivity of patch 11.The conductivity of graphene is by band internal conductance rate σintraWith interband conductivityσinterTo characterize.Work as graphene
(it is less than 10THz) in low Terahertz frequency range, interband conductivityσ can be ignoredinterInfluence, conductivity mainly by band internal conductance
Rate σintraIt determines, and can be calculated by following formula:
Here in (1) formula, j is imaginary unit, and e is unit charge (1.6e-19 (c)), kBFor Boltzmann constant
(1.38e-23 (J/K)),It is reduced Planck constant, being worth for 1.05e-34 (Js), T is room temperature, and Γ is graphene scattering
Rate, τ are the relaxation times, and ω is angular frequency, μcFor chemical potential.In the design, select room temperature T for 300K, chemical potential μc=
0.64eV, relaxation time τ=14.6ps, graphene scattered power take Γ=1/ (2 τ).
As shown in figure 3, the angle that Fig. 3 is graphene patch 11 in graphene reflector element rotates schematic diagram.The stone
Black alkene reflector element 1 has a certain range of reflected phase, but to realize that the wave beam with SAM can be to any desired
Direction deflection, it is necessary in conjunction with Pancharatnam-Berry (PB) phase method to the graphene patch of graphene reflector element 1
11 are rotated according to certain rule, and the present invention calculates graphene patch 11 using PB phase method and is arranged on quartz medium plate 12
The rotation angle on surface, and then 360 ° of all phase, which regulates and controls, to be realized to radiation beam.The advantage of PB phase method is, works as graphene
Poor 180 ° of reflected phase to left-hand circular polarization (LHCP) and right-handed circular polarization (RHCP) both line polarization waves of reflector element 1
When, after graphene patch 11 rotates angle, θ, it will be able to realize the reflected phase of 2 θ.Graphene reflector element 1 is according to PB phase method
The angle of rotation and the reflected phase relationship of its back wave can be illustrated by the following derivation of equation.When a left-handed entelechy
When changing upper surface of (LHCP) wave along the direction-z vertical incidence graphene reflector element 1, incidence wave EinWith back wave EreIt can be with table
It is shown as:
HereWithIt is phase offset of the incidence wave to x-component and y-component respectively.
Position (b) in Fig. 3, postrotational seat are obtained after graphene patch 11 rotates θ degree by position (a) in Fig. 3
Relationship between mark x ' y ' z ' and original coordinates xyz can be represented as:
?WithUnder conditions of, formula (4) is brought into formula (3), back wave EreIt will indicate are as follows:
By formula (5), available left-hand circular polarization (LHCP) component ErLHCPWith right-handed circular polarization (RHCP) component
ErRHCP:
In above two formula (6) and (7), work as satisfactionWhen,
ErRHCP=0 (9)
As can be seen that left-hand circular polarization (LHCP) component E from two formulas (8) and (9)rLHCPIt is retained, amplitude is constant and phase
Position becomes 2 times of original (e-j2θ), if therefore turned out want realize 2 θ reflected phase, it is only necessary to rotating θ degree can be achieved with
Required reflected phase.
Refering to what is shown in Fig. 4, Fig. 4 is the simulation model schematic diagram for establishing graphene reflector element 1 using HFSS simulation software.
According to the above theoretical foundation, the initial of the simulation model for establishing graphene reflector element 1 is inputted in HFSS simulation software
Dimensional parameters: the length of graphene patch 11 is 10um, width 2.9um, and the side length of quartz medium plate is 13.5um, thickness
25um, side length 13.5um, the thickness 0.5um of metal floor.In the present embodiment, to establish graphene using HFSS simulation software anti-
The step of penetrating the simulation model of unit includes: to construct graphene reflector element according to original dimension parameter in HFSS simulation software
1 simulation model；As soon as being air in the top setting region of the simulation model of graphene reflector element, this region is called
Air chamber, for simulating the electromagnetic response of graphene reflector element 1 under vacuum conditions.In design of Simulation, two groups of masters are established
From boundary (main boundary 1, main boundary 2 in Fig. 4, and from boundary 1, from boundary 2) condition is separately positioned on four of air chamber
On face, for simulating infinitely great plane, a cycle element excitation port (end Floquet is set in the top of air chamber
Mouthful) be used as driving source, for generating incidence wave vertically downward, in simulation model be arranged " De- embedding ", indicate incidence wave from
The upper surface of graphene patch 11 starts incidence.
Refering to what is shown in Fig. 5, Fig. 5 is the reflected phase of graphene reflector element and the curve synoptic diagram of reflection amplitudes.At this
In embodiment, Electromagnetic Simulation is carried out in HFSS simulation software using the simulation model of graphene reflector element 1, can obtain stone
The electromagnetic response of black alkene reflector element 1, the i.e. simulation curve of the reflected phase and reflection amplitudes of incidence wave, as shown in figure 5, for
The reflected phase curve of x polarized wave and reflected phase curve to y polarized wave have about in 1.36~1.62THz frequency range
180 ° of phase difference meets the necessary condition of PB phase unit rotation.Such as the rectangular element (rectangular graphene patch 11) in Fig. 5
Refer to PB phase unit, as long as rectangular element, which meets, meets about 180 ° to the phase difference of x polarization and y two kinds of waves of polarization, energy
Phase is obtained using PB phase rotation method.Meanwhile the reflection amplitudes curve for x polarized wave and the reflection width to y polarized wave
It writes music line, the range value in this frequency range is larger (being all larger than -0.3dB), can guarantee the amplitude of sufficiently large back wave.
In the present embodiment, by comparing the simulation analysis result of graphene reflector element 1 and applied to Terahertz frequency range
The difference of the desired design performance of the graphene reflector element of (1.36~1.62THz) constantly adjusts graphene reflector element 1
Dimensional parameters are inputted, until meeting the desired design for the graphene reflector element 1 of spin angular momentaum deflection on three-dimensional
After performance requirement, it can just be accurately determined every actual size parameter of graphene reflector element 1, every actual size parameter
As follows: the length a of graphene patch 11 is 13.39um, width b is 3.2um；The side length s of quartz medium plate 12 is 14um, thickness
Degree h is 26um；The side length s of metal floor 13 is 14um, with a thickness of 1um.The desired design performance includes being used for three-dimensional
The electromagnetic response performance of the graphene reflector element 1 of upper spin angular momentaum deflection, i.e. incidence wave are being incident on graphene reflection list
The indexs performances such as reflected phase and reflection amplitudes in member 1.
Refering to what is shown in Fig. 6, Fig. 6 is the top view of all graphene reflector elements 1 distribution in the super surface 2 of graphene.?
In the present embodiment, the rotation angle of 12 upper surface of quartz medium plate is arranged in the graphene patch 11 of each graphene unit 1
θ surpasses the distribution of the reflected phase at each position in surface 2 by graphene to determine.After having designed basic graphene unit 1, lead to
The reflected phase distribution calculated at each position in the super surface 2 of graphene to be built is crossed, is constituted on the super surface 2 of graphene to determine
The rotation angle, θ of graphene patch 11 on each graphene unit 1, and at each position in the super surface 2 of graphene to be built
Reflected phase distribution can be calculated by following formula:
Φ (x, y)=Φ0(x,y)-k0Sin θ ' (xcos γ+ysin γ) (10),
Wherein θ=Φ (x, y)/2 (11)；
Φ (x, y) is the reflected phase of graphene reflector element, k in (10) formula0For the wave number in free space, Φ0
(x, y) is the initial phase of graphene reflector element, and θ ' is the angle of electromagnetic wave projection in the two-dimensional direction and X-axis, x and y
Abscissa, ordinate in the position coordinates of respectively each graphene reflector element, θ are each graphene patch in graphene
Rotation angle on unit, γ be electromagnetic wave on three-dimensional with the angle of Z axis.According to formula (10) and (11), obtain
The reflected phase Distribution Value of entire super 2 position of surface of graphene, and for 2 θ of each reflected phase value, according to PB phase
Position principle, it is only necessary to which the graphene patch 11 of the composition graphene reflector element 1 at this position is rotated into θ angle, it will be able to
Reflected phase needed for realizing.Finally, the graphene that the graphene patch 11 of each position different rotation angle is constituted reflects
Unit 1 combines, be formed can on three-dimensional spin angular momentaum deflect the super surface 2 of graphene.
Refering to what is shown in Fig. 7, the graphene patch that Fig. 7 is the super surface 1 of graphene rotates angle distribution map, greyish white intensity is used
Figure come indicate everywhere needed for rotation angle.In the present embodiment, each position in the super surface 2 of graphene is found out using formula (10)
The phase distribution for setting place, according to PB phase principle, it is only necessary to by the graphene of the composition graphene reflector element 1 at this position
Patch 11 rotates the half angle of the reflected phase at corresponding position, it will be able to realize required reflected phase.Finally, will
The graphene reflector element 1 that the graphene patch 11 of each position different rotation angle is constituted combines, and being formed can
Generate the super surface 2 of graphene that spin angular momentaum deflects on three-dimensional.
As shown in figure 8, Fig. 8 is the normalization antenna pattern on the super surface 2 of graphene.It can be real in order to verify the super surface
Now the same polarization of incident circular polarisation electromagnetic wave is converted, Electromagnetic Simulation is carried out to the super surface of this graphene, setting one is left-handed
Circular polarisation (LHCP) wave makees vertical incidence as input source, is incident on the super surface, observes its normalization antenna pattern.
As shown in figure 8, Fig. 8 is the normalization antenna pattern on the super surface of graphene.Sight on three-dimensional with 45 degree of the angle of Z axis
It examines on position, in the range of graphene patch selected angle θ value is -90 ° -90 °, the LHCP component of back wave is in the two-dimensional direction
Projection and X-axis angle 45 position at have a maximum peak value, illustrate to produce LHCP wave in this direction, it was demonstrated that
The correctness of design.
The present invention constructs a kind of graphene reflector element 1 of new parameter structure, utilizes this 1 structure of graphene reflector element
The super surface 2 of the graphene built can generate the electromagnetic wave of specified spin mode on desired three-dimensional, so as to accurate
Spin angular momentaum of the electromagnetic wave on three-dimensional and deflection direction are controlled.
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure made by bright specification and accompanying drawing content or equivalent function transformation, are applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (8)
1. a kind of super surface of graphene of the deflection of the spin angular momentaum on three-dimensional, which is characterized in that the super table of the graphene
Face is rearranged by the graphene reflector element of N*N unit of quantity, each graphene reflector element is by three-decker group
At rectangular parallelepiped structure, each graphene reflector element include the graphene patch of top layer, middle layer quartz medium plate with
And the metal floor of bottom；
The center position of quartz medium plate upper surface is arranged in the graphene patch, and the setting of graphene patch is situated between in quartz
The rotation angle of scutum upper surface is θ, and the lower surface of quartz medium plate is arranged in the metal floor, the graphene patch
Central point is overlapped with the central point of quartz medium plate, wherein the rotation angle, θ is any angle within the scope of -90 °~90 °；
The rotation angle, θ of quartz medium plate upper surface is arranged in by the graphene in the graphene patch of each graphene unit
Reflected phase at the super each position in surface is distributed the reflected phase distribution to determine, at each position in the super surface of graphene
It is calculated by following formula:
Φ (x, y)=Φ0(x,y)-k0Sin θ ' (xcos γ+ysin γ), wherein θ=Φ (x, y)/2
Wherein the Φ (x, y) in upper two formula is the reflected phase of graphene reflector element, k0For the wave number in free space, Φ0
(x, y) is the initial phase of graphene reflector element, and θ ' is the angle of electromagnetic wave projection in the two-dimensional direction and X-axis, x and y
Abscissa, ordinate in the position coordinates of respectively each graphene reflector element, θ are each graphene patch in graphene
Rotation angle on unit, γ be electromagnetic wave on three-dimensional with the angle of Z axis.
2. the super surface of graphene for spin angular momentaum deflection on three-dimensional as described in claim 1, which is characterized in that
The graphene patch is rectangle, the quartz medium plate and metal floor be a kind of upper and lower surface be square it is rectangular
Body structure.
3. the super surface of graphene for spin angular momentaum deflection on three-dimensional as claimed in claim 2, which is characterized in that
The actual size parameter of the graphene reflector element is as follows: the length of the graphene patch is 13.39um, width is
3.2um；The side length of the quartz medium plate is 14um, with a thickness of 26um；The side length of the metal floor be 14um, with a thickness of
1um。
4. the super surface of graphene for spin angular momentaum deflection on three-dimensional as described in claim 1, which is characterized in that
The working frequency on the super surface of graphene is the Terahertz frequency range of 1.36~1.62THz frequency range.
5. the super surface of graphene for spin angular momentaum deflection on three-dimensional as claimed in claim 4, which is characterized in that
Conductivity when the graphene patch works in the low Terahertz frequency range for being less than 10THz frequency, in low Terahertz frequency range
By band internal conductance rate σintraIt determines, and is calculated by following formula:
In above formula, j is imaginary unit, and e is unit charge, kBFor Boltzmann constant,It is reduced Planck constant, T is room
Temperature, Γ are graphene scattered powers, and τ is the relaxation time, and ω is angular frequency, μcFor chemical potential.
6. the super surface of graphene for spin angular momentaum deflection on three-dimensional as claimed in claim 5, which is characterized in that
Wherein T is 300K, chemical potential μc=0.64eV, relaxation time τ=14.6ps, graphene patch scattered power be Γ=1/ (2
τ)。
7. such as the graphene super surface as claimed in any one of claims 1 to 6 for spin angular momentaum deflection on three-dimensional,
It is characterized in that, the super surface of graphene is rearranged by the graphene reflector element of 51*51 unit of quantity, and the graphene is super
The surface size on surface is 714um*714um.
8. the super surface of graphene for spin angular momentaum deflection on three-dimensional as claimed in claim 7, which is characterized in that
The mutual seamless super surface of graphene for being arranged to make up rectangular parallelepiped structure between each graphene reflector element.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116111360A (en) * | 2023-01-10 | 2023-05-12 | 西安电子科技大学 | Design method of double circularly polarized orbital angular momentum independently controllable super-surface array |
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2018
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116111360A (en) * | 2023-01-10 | 2023-05-12 | 西安电子科技大学 | Design method of double circularly polarized orbital angular momentum independently controllable super-surface array |
| CN116111360B (en) * | 2023-01-10 | 2023-09-26 | 西安电子科技大学 | Design method of double circularly polarized orbital angular momentum independently controllable super-surface array |
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