CN108649341A - The bessel beam excitation apparatus on super surface is transmitted based on geometry Bell's phase - Google Patents
The bessel beam excitation apparatus on super surface is transmitted based on geometry Bell's phase Download PDFInfo
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- CN108649341A CN108649341A CN201810329235.3A CN201810329235A CN108649341A CN 108649341 A CN108649341 A CN 108649341A CN 201810329235 A CN201810329235 A CN 201810329235A CN 108649341 A CN108649341 A CN 108649341A
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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
- H01Q15/004—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 using superconducting materials or magnetised substrates
-
- 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
- H01Q15/02—Refracting or diffracting devices, e.g. lens, prism
- H01Q15/12—Refracting or diffracting devices, e.g. lens, prism functioning also as polarisation filter
Abstract
The invention belongs to electromagnetism control technique fields, and the bessel beam excitation apparatus on super surface is specially transmitted based on geometry Bell's phase.Including incidence mount, conversion equipment and reception device；Initial light excitation uses time domain gate technique, is generated by it pulse signal, and obtaining left-hand/right-hand circular polarization planar light to external radiation by circular polarized antenna loudspeaker completes excitation.Initial rotatory polarization impinges perpendicularly on the super surface conversion equipment of geometry Bell's phase, transmission modulus value and phase is set to unlock by rotary unit structure, in the case where keeping perfect transmission, independent regulation and control transmission phase makes it that linear gradient distribution radially be presented, to generate efficient bessel beam.The present invention compared to traditional Bezier light exciter there is efficiency of transmission higher, purer, the thinner advantage of polarization to be suitable for the optical fields such as following the integrated of light path, the accurate manipulation of particle, the imaging of body structure surface pattern and sample processing.
Description
Technical field
The invention belongs to electromagnetism control technique fields, and in particular to a kind of microwave bessel beam excitation apparatus.
Background technology
The dielectric constant and magnetic conductivity of material determine how its electromagnetic wave will be propagated, however the optical parameter of nature material
The range that can be covered is very limited, to limit the ability of regulation and control to electromagnetic wave.Meta Materials are that one kind is total to by electromagnetism
Unit (abbreviation structural unit) shake according to made of certain arrangement mode arrangement, can almost cover all Optical Parametrics
Number, significantly enhances the ability regulated and controled to electromagnetic wave.Meta Materials one kind therein is called super surface, is electromagentic resonance unit
Simple according to made of certain arrangement mode arrangement, making in two dimensional surface, volume is thin, it is most important that it is only needed
Consider that the phase distribution on each position can realize that the arbitrary regulation and control to electromagnetic wave are its biggest advantages, has wide
General application prospect.In electromagnetic control device, pure phase position adjusting means acts as an indispensable angle in application field
Color, for example：Focusing, holography, the excitation of vortex light, Bezier light etc. are realized by pure phase position adjusting means.However, traditional
In the device for generating bessel beam, since electromagnetic scattering modulus value and phase cannot unlock that and mean that efficiency is low, this
Problem annoyings always this field (i.e.：When adjustment phase place, inevitably change modulus value), this leads to pure phase position tune
The exception for saving the design point of device is cumbersome, or even difficult, and degree of difficulty can increase with the channel of system and be improved, especially
It is to be operated in when incident light is circularly polarized light due to anisotropic presence in system, four pattern difference will necessarily be produced
Only have to structure rotational sensitive for regular transmission pattern, abnormal transmission mode, regular reflection pattern and abnormal reflection pattern
Abnormal saturating/reflection, then how to go to suppress other three patterns under transmission system to be always a prodigious problem, this
It is low more importantly due to the working performance of the interference effect device of other patterns that problem not only results in efficiency.In addition, traditional
For the thickness of phase adjusted device usually more than wavelength magnitude, this brings inconvenience in the integrated aspect of light path.
Invention content
The purpose of the present invention is to provide a kind of modulus value that can realize transmissivity and phase unlock based on geometry Bell
Phase transmits the excitation apparatus of the bessel beam on super surface.
The bessel beam excitation apparatus that super surface is transmitted based on geometry Bell's phase proposed by the invention, including incidence
Device, conversion equipment and reception device, wherein：
The incidence mount, consists of two parts：First part is net point (net point that such as brand is Agilent E8362C),
Second part is a circular polarized antenna loudspeaker.The effect of net point is transmitting pulse signal, and pulse signal is passed to circular polarisation day
Line loudspeaker make it generate the circular polarisation electromagnetic wave vertical incidence of almost plane wave to conversion module to external radiation；
The conversion equipment is a kind of super surface of geometry Bell phase transmission；It is operated under circular polarization electromagnetic wave, makes just
Deviation occurs for incident electromagnetic wave and then interfere to form bessel beam；
The reception device is made of electric dipole probe, metallic support and programmable stepper motor self assembly
Electric field space three-dimensional scanning measurement instrument generates left-hand/right-hand circular polarization shellfish plug for measuring through Bezier light excitation apparatus
The electric field space distribution of your light.
Reception device also carries out calibrating detection as follows：
Calibration experiments：Firstly, it is necessary to the energy of each frequency is normalized, so first by conversion equipment with air generation
It replaces, i.e., is not put into the super surface of geometry Bell's phase of " rotational structure ", and allow incident electromagnetic wave is without hindrance to be passed through, calibration is left-handed/
Right-handed circular polarization loudspeaker；Calibration experiments are to know the gross energy of each frequency.
Detection experiment：After calibrating Circular polarization horn, conversion equipment (the super surface of geometry Bell's phase) is put into test system
In；X-component/y-component of electric dipole probe scanning Bezier optical electric field is driven using programmable stepper motor.Test experience
It is to detect whether conversion equipment can efficiently generate chiral bessel beam.
In the present invention, the geometry Bell phase transmits super surface, is by a series of identical electromagnetic medium unit of structures
Carry out the two-dimensional array of corresponding rotation φ angles composition, rotation mode according toIt is revolved
Turn, wherein x, y respectively represent the position of structural unit；λ0Indicate the wavelength corresponding to working frequency, it is flat after θ expression deviations
Angle between face light and vertical incidence planar light, planar light, that is, bessel beam after deviation are by a series of the flat of deviations
The face interference of light is formed；
In the present invention, the incidence mount uses time domain gate technique, by the incident circular polarization planar light with wave packet form
Incidence, avoid forming standing wave inside Bezier light excitation apparatus and the precision that influences measurement result；The circular polarization of incidence to be detected
Planar light is incident using almost plane light form, makes the equiphase surface (beam waist position) of incident circular polarization planar light and " rotation is tied
The super surface of structure " electromagnetic medium overlaps, it is made fully to experience the modulation of local geometry Bell's phase on super surface.
In the present invention, the additional transmission phase of super each local of surface of " rotational structure " electromagnetic medium is (academicly
Referred to as geometry Bell phase) it is determined by the main shaft geometrical rotation angle of the media units structure of local, also, each local
Transmission amplitude it is unrelated with the main shaft geometrical rotation angle of electromagnetic medium cellular construction, to realize pure phase adjusted；Geometry shellfish
The application of your phase makes transmissivity modulus value and phase unlock.
In the present invention, at working frequency range, i.e., working frequency is 11.8GHz, is realized on the super surface of geometry Bell phase
The absolute efficiency approximation 100% of abnormal transmission mode.
In the present invention, the super surface local electromagnetic response design of geometry Bell phase：Complete same electromagnetic medium unit knot
Structure is both designed as transmiting along two major axes orientations, working frequency 11.8GHz, because the geometric parameter of cellular construction is entirely same, institute
It is maintained with the transmissivity modulus value of each local, no matter unit turns and do not turn to have no effect on its transmitance；Each unit
Structure is both designed as rotating Φ angles, in this way each cellular construction along the axis direction of local using respective center as origin
Different local geometry Bell's phases can be generated, independent regulation and control are carried out from the phase to each local, by geometry Bell's phase
Replacement transmissivity phase adjusting.
In the present invention, Transmission Conditions realize perfect transmission simultaneously in two diameter axis directions and phase differs 180 °, need profit
With two kinds of no saturating mechanism of height, to realize phase difference that is high saturating and opening 180 ° in two vertical directions simultaneously；By having
It imitates medium to calculate, obtains a direction and resonated using FP, another direction realizes perfection thoroughly respectively using scattering cancellation principle
It penetrates (i.e. total transmissivity), and there are 180 ° of phase differences；So：
The electromagnetic medium unit is formed by A, B, A trilaminate：Pass through Jones matrix theory and symmetrical analysis, it is desirable that
Electromagnetic medium cellular construction has mirror symmetry, and condition is met at working frequency：
|txx|=| tyy|=1, argtxx-argtyy=180 °.
txxAnd tyyFor along the transmission coefficient of diameter axis direction；Wherein x, y indicate two vertical journal axle sides of unit respectively
To t represents transmission coefficient, and arg represents its phase；
By the guidance of efficient theory above, after meticulous design, be designed to by ABA three-layer metals structure respectively by
The separated structure of two layer medium layer.Wherein A layers of structure is a single metal strip；B layers of structure are the group of metal strip and quoit
It closes, i.e., outer ring is metal circle, and metal strip can specifically carve the copper on copper-clad plate homogeneous dielectric layer along the diameter of metal circle
It is rectangular strip structure among circle at the circle cyclic structure of hollow out.Metal strip size in A layers of structure and B layers of structure
Unanimously, metal strip is aligned up and down in tri- layers of A, B, A, forms mirror symmetrical structure.
In embodiment, in the electromagnetic medium cellular construction, strip width w=0.9mm, metal strip length L=
5.2mm, metal circle radius r=2.9mm, i.e. diameter d=5.8mm, period (i.e. magnetic medium element length) p=6mm；A、B、A
In three-layer metal structure between adjacent two layers by thickness be h dielectric layer separate, dielectric thickness h be 2mm, dielectric parameter ε=
4.3。
The arrangement mode design principle of artificial atom is such as in the present invention, in the super surface of " rotational structure " electromagnetic medium
Under：Geometry Bell's phase arrangement mode is that radial linear gradient is distributedThat is electromagnetic medium list
The major axes orientation of meta structure around local z-axis rotational angle be φ (x, y)/2, wherein x, y are world coordinates, the angle, φ along
Radial linear increase；λ0Indicate the wavelength corresponding to working frequency, the planar light after θ expression deviations and vertical incidence planar light
Between angle, the planar light after deviation refers to：Bessel beam is formed by a series of plane interference of light of deviations.
In more wide application scenarios, it can not limitAccording to actual needs
Different geometry Bell's phase distributions is designed, for example：The arrangement mode relational implementation that parabolic phase distribution can be designed is poly-
Coke is designed as holographic phase arrangement mode, realizes holographic imaging etc..
The present invention is breached compared to traditional Bezier light exciting method, has efficient, pure (single mode), ultra-thin (wavelength
1/6th) the advantages of, the transmission of the electromagnetism respective design of traditional electromagnetic medium unit is solved using geometry Bell's phase
The problem of modulus value and phase of rate cannot unlock.In the case where keeping efficient modulus value constant, realize that pure transmission phase is adjusted,
And devise the super surface that geometry Bell's phase branch is the radially linear gradient of phase.Plane wave is efficiently converted
At Bezier light.The present invention has efficiency of transmission higher compared to traditional Bezier light exciter, polarizes purer, thickness
Thinner advantage is suitable for following the integrated of light path, the accurate manipulation of particle, the imaging of body structure surface pattern and sample processing
Equal optical fields.
Description of the drawings
Fig. 1 is the principle schematic of efficient microwave Bezier light excitation apparatus.
Fig. 2 is the structural schematic diagram of electromagnetism specially media units.Wherein, (a) is A layers of structure：Single metal strip structure；
(b) it is B layers of structure：It can be the combination of metal strip structure and metal coil structures；(c) it is A, B, A trilaminate Fig. 3 unit samples
Structure chart.
Fig. 3 is the sample photo of electromagnetism specially media units.
Fig. 4 is the microwave experiment and FDTD analog results of the modulus value and phase of transmissivity.More than 0.8 frequency band of transmission coefficient
Wide (10.7-12.3GHz).Wherein, (a) is microwave experiment as a result, (b) being FDTD analog results.
Fig. 5 is transmission abnormal patterns (Ta) and reflectance anomaly pattern (Ra), transmission normal mode (Tn) and reflection normal mode
The transformation efficiency of formula (Rn).It is almost 0 in working frequency 11.8GHz, Ta=92% (experimental result) and other three patterns,
Remaining energy is absorbed by medium.Wherein, (a) is transmission abnormal patterns (Ta) and reflectance anomaly pattern (Ra) transformation efficiency,
(b) it is the transformation efficiency for transmiting normal mode (Tn) and reflection normal mode (Rn).
Fig. 6 is that efficient Bezier light excitation apparatus tests reforming unit sample photo.
Fig. 7 excitations, conversion and reception device schematic diagram.
Fig. 8 is efficient Bezier light excitation apparatus experimental result.Wherein, (a-d) is near working frequency 11.8GHz
The FDTD analog results of the Bezier photoelectricity field distribution by reforming unit of (9GHz, 11GHz, 11.8GHz, 13GHz).(f-
H) it is the Bezier photoelectricity by reforming unit of (9GHz, 11GHz, 11.8GHz, 13GHz) near working frequency 11.8GHz
The microwave experiment result of field distribution.
Fig. 9 is efficient Bezier light excitation apparatus self-healing property experimental verification.Wherein, (a) is working frequency points 11.8GHz shellfish plugs
The experimental result of your photoelectricity field distribution, is (b) that the metal ball that size is 15mm (half of operation wavelength) is placed in Bezier light field
The self-healing property experimental result of middle-range conversion equipment 55mm is moved into after (c) an equal amount of metal ball changes its position
Experimental result after at 125mm.
Figure 10 characterizes for efficient Bezier excitation apparatus efficiency.Wherein, (a) is that 2 dimension Bezier light excitation apparatus samples shine
Piece, (c) and (d) be initial light is that left circularly polarized light is carried out with left-handed loudspeaker and dextrorotation loudspeaker respectively after conversion equipment
The experimental result of far field detection is (b) nearby to do energy integral to operating angle to detect total energy with no conversion equipment far-field energy
Amount is divided by obtain its efficiency, and conventional efficient is 91% in working frequency points.
Specific implementation mode
The actual key of the present invention is how to realize modulus value and the phase unlock of transmissivity.Keeping high efficiency transmission rate modulus value
In the case of, pure transmission phase adjusting means is designed, the embedded radial direction linear gradient distribution on the equiphase surface of plane of incidence light,
It is efficient to generate bessel beam.
1, theoretical analysis part：
It can be calculated the expression formula of four patterns by Jones matrix：
Ta=| (txx-tyy)|2/4,Ra=| (rxx-ryy)|2/4
Tn=| (txx+tyy)|2/4,Rn=| (rxx+ryy)|2/4 (1)
Four patterns are：Abnormal transmission mode (Ta) can experience the transmission mode of conversion equipment phase change, abnormal
Reflective-mode (Ra) can experience the reflective-mode of conversion equipment phase change, and regular transmission pattern (Tn) can not be experienced
To the general transmission mode of conversion equipment phase change, regular reflection pattern (Rn) can not experience the change of conversion equipment phase
The general reflective-mode changed,.
By theory analysis, if system meets the following conditions,：
|rxx|=| ryy|=0, | txx|=| tyy|=1, arg (txx)-arg(tyy)=π (2)
Can completely eliminate reflectance anomaly pattern (Ra), transmission normal mode (Tn), reflection normal mode (Rn) this three
The energy dissipation of branch pattern, and then all incident wave energies are all transformed into abnormal transmission mode (Ta), it is efficiently saturating to realize
It penetrates.
2, analog portion：
It is designed cellular construction and super surface by the simulation softward of finite time-domain difference (FDTD).
We devise with a mirror symmetry and satisfaction | txx|=| tyy|=1argtxx-argtyy=180 °
And it is made of three-decker：Such as Fig. 2 (a)
(a) first layer is metal strip structure：Thickness is 0.05mm, and structural parameters are respectively length L=5.2mm, line width w
=0.9mm；
(b) second layer is metal strip structure and metal coil structures：The geometric parameter of metal strip structure is consistent with first layer, gold
Belong to circle hole radius r=2.9mm, i.e. diameter d=5.8mm；
(c) third layer is metal strip structure：Geometric parameter is consistent with first layer
The size of cellular construction is p × p=6mm × 6mm, thickness of dielectric layers h=2mm, dielectric layer relative dielectric constant
It is 4.3, relative permeability 1.
3, experimental section：
Making size is 486 × 486mm2Printed circuit board (abbreviation PCB), dielectric layer are the uniform and FR-4 to the same sex
Material, structural parameters are consistent with the design of analog portion.
Experimental example 1：Measure the electromagnetic property of the cellular construction of composition conversion equipment
Based on the super surface of " not rotational structure " electromagnetic medium：Each unit does not rotate.Test measurement frequency range 9-
13GHz, experimental result are consistent with analog result：Meet at working frequency point 11.8GHz：
|rxx|=ryy|=0, | txx|=tyy|=1, arg (txx)-arg(tyy)=π,
Abnormal transmission mode Ta=93% experimental results.
Experimental example 2：Bessel beam non-diffractive characterizes
Based on the super surface of " rotational structure " electromagnetic medium：The geometry rotation angle of each cellular construction meet φ (x, y)/
2, xy be the world coordinates of cellular construction.
When incident light is left circularly polarized light, transmitted light is the Bezier light of right-hand circular polarization, the real part of electric field x-component
Distribution is as shown in Fig. 8 (a-h), and experimental result is consistent with analog result.
3 bessel beam self-healing property of experimental example characterizes
The metal ball of a diameter of 15mm (half of operation wavelength) size is put into Bezier by the experimental structure based on experiment 2
The centre of the transmission path of light, and away from conversion equipment 55mm at.As Fig. 4 (b) Bezier light after scatterer self-healing (from
More property：General electromagnetic wave, which encounters barrier, can be dispersed into all directions, and self-healing property, which is exactly it, can pass through barrier continuation
Propagate forward), then change and verified again at the 125mm of its position, as Fig. 4 (c) bessel beams can be very good self-healing.
Experimental example 4 generates the converter efficiency characterization of bessel beam
Based on the experimental structure in experiment 2, converter sample photo such as Fig. 5 (a) uses left-hand polarization loudspeaker, dextrorotation inclined respectively
Shake loudspeaker, carries out total space far field detection to it, shown in Energy distribution such as Fig. 5 (c) (d), is carried out energy integral with always
Energy is compared to obtain its absolute efficiency such as Fig. 5 (b), and experiment is consistent with analog result, and conventional efficient is up to 91%.
Claims (5)
1. a kind of bessel beam excitation apparatus transmiting super surface based on geometry Bell's phase, which is characterized in that including incidence
Device, conversion equipment and reception device, wherein：
The incidence mount, consists of two parts：Net point and a circular polarized antenna loudspeaker；Net divides for emitting pulse signal,
Pulse signal is passed into circular polarized antenna loudspeaker, it is made to generate the circular polarisation electromagnetic wave vertical incidence of almost plane wave to external radiation
To conversion module；
The conversion equipment is a kind of super surface of geometry Bell phase transmission；It is operated under circular polarization electromagnetic wave, makes normal incidence
Electromagnetic wave occur deviation so that carry out interference form bessel beam；
The reception device is the electric field made of electric dipole probe, metallic support and programmable stepper motor self assembly
Space three-dimensional sweep measuring set generates left-hand/right-hand circular polarization Bezier light for measuring through Bezier light excitation apparatus
Electric field space distribution；
Wherein, the geometry Bell phase transmits super surface, is carried out accordingly by a series of identical electromagnetic medium unit of structures
Rotate φ angle continuation composition two-dimensional array, rotation mode according toIt carries out, wherein x, y
Respectively represent the position of structural unit；λ0Indicate working frequency corresponding to wavelength, θ indicate deviation after planar light with it is vertical enter
The angle between planar light is penetrated, bessel beam is formed by a series of plane interference of light of deviations；
The incidence mount uses time domain gate technique, and the incident circular polarization planar light is incident with wave packet form；It is to be detected enter
The circular polarization planar light penetrated is incident using almost plane light form, makes the equiphase surface i.e. beam waist position of incident circular polarization planar light
Super surface is transmitted with geometry Bell's phase of " rotational structure " to overlap, it is made fully to experience local geometry Bell's phase on super surface
The modulation of position.
2. bessel beam excitation apparatus according to claim 1, which is characterized in that the super surface of geometry Bell phase
At working frequency range, i.e., working frequency is 11.8GHz, realizes the absolute efficiency approximation 100% of abnormal transmission mode.
3. bessel beam excitation apparatus according to claim 2, which is characterized in that the electromagnetic medium unit by A, B,
A trilaminates form：Pass through Jones matrix theory and symmetrical analysis, it is desirable that electromagnetic medium cellular construction has minute surface symmetrical
Property, condition is met at working frequency：
|txx|=| tyy|=1, argtxx-argtyy=180 °；
txxAnd tyyFor along the transmission coefficient of diameter axis direction；Wherein x, y indicate the vertical diameter axis direction of two of unit, t respectively
Transmission coefficient is represented, arg represents its phase.
4. bessel beam excitation apparatus according to claim 3, which is characterized in that the electromagnetic medium unit by A, B,
In A trilaminate structures, A layers of structure are a single metal strip；B layers of structure are the combination of metal strip and quoit, i.e. outer ring is
Metal circle, metal strip are specifically carved into the copper on copper-clad plate homogeneous dielectric layer the circle of hollow out along the diameter of metal circle
Shape structure, circle centre are rectangular strip structure；A layers of structure are consistent with the metal strip size in B layers of structure, A, B, A tri-
Metal strip is aligned up and down in layer, forms mirror symmetrical structure.
5. bessel beam excitation apparatus according to claim 4, which is characterized in that the electromagnetic medium unit by A, B,
In A trilaminate structures, strip width w=0.9mm, metal strip length L=5.2mm, metal circle radius r=2.9mm, i.e.,
Diameter d=5.8mm, period, that is, magnetic medium element length p=6mm；A, it is by thickness between adjacent two layers in B, A three-layer metal structure
The dielectric layer of h separates, and dielectric thickness h is 2mm, dielectric parameter ε=4.3.
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| CN110244474A (en) * | 2019-04-25 | 2019-09-17 | 桂林电子科技大学 | It is a kind of to polarize controllable light track angular momentum superposition state generator based on super surface |
| CN110854517A (en) * | 2019-11-14 | 2020-02-28 | 北京邮电大学 | Reflector array antenna design method based on diffraction-free focusing theory |
| CN110994157A (en) * | 2019-12-23 | 2020-04-10 | 浙江科技学院 | Vortex-shaped array antenna of double-helix phase-shifting unit |
| CN111999901A (en) * | 2020-06-23 | 2020-11-27 | 南开大学 | Super-surface axial cone device for generating multiband achromatic Bessel beams |
| CN112859230A (en) * | 2021-01-20 | 2021-05-28 | 成都第三象限未来科技有限公司 | Terahertz super-structure focusing lens for realizing one-way spin circular polarization state conversion |
| CN113534475A (en) * | 2021-07-21 | 2021-10-22 | 上海理工大学 | Method for generating Bessel space-time wave packet and Bessel space-time vortex wave packet |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110244474A (en) * | 2019-04-25 | 2019-09-17 | 桂林电子科技大学 | It is a kind of to polarize controllable light track angular momentum superposition state generator based on super surface |
| CN110854517A (en) * | 2019-11-14 | 2020-02-28 | 北京邮电大学 | Reflector array antenna design method based on diffraction-free focusing theory |
| CN110994157A (en) * | 2019-12-23 | 2020-04-10 | 浙江科技学院 | Vortex-shaped array antenna of double-helix phase-shifting unit |
| CN111999901A (en) * | 2020-06-23 | 2020-11-27 | 南开大学 | Super-surface axial cone device for generating multiband achromatic Bessel beams |
| CN112859230A (en) * | 2021-01-20 | 2021-05-28 | 成都第三象限未来科技有限公司 | Terahertz super-structure focusing lens for realizing one-way spin circular polarization state conversion |
| CN112859230B (en) * | 2021-01-20 | 2022-11-25 | 成都第三象限未来科技有限公司 | Terahertz super-structure focusing lens for realizing one-way spin circular polarization state conversion |
| CN113534475A (en) * | 2021-07-21 | 2021-10-22 | 上海理工大学 | Method for generating Bessel space-time wave packet and Bessel space-time vortex wave packet |
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