CN110133759A - One kind being based on VO2Dynamic Terahertz super lens - Google Patents
One kind being based on VO2Dynamic Terahertz super lens Download PDFInfo
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- CN110133759A CN110133759A CN201910326566.6A CN201910326566A CN110133759A CN 110133759 A CN110133759 A CN 110133759A CN 201910326566 A CN201910326566 A CN 201910326566A CN 110133759 A CN110133759 A CN 110133759A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/002—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of materials engineered to provide properties not available in nature, e.g. metamaterials
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
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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
- H01Q15/02—Refracting or diffracting devices, e.g. lens, prism
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/06—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using refracting or diffracting devices, e.g. lens
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
The invention belongs to function solenoid device arts, emphasis is directed to terahertz wave band dynamic function device.The present invention uses the phase modulation unit structure of vanadium dioxide c-opening ring, metal c-opening ring and vanadium dioxide and metal composite split ring, and the discontinuous variation of phase is realized according to the size of structure, opening direction and split ring material transitions；Using the phase-change characteristic of vanadium dioxide, change the mode of resonance of structure, to change the transmission phase of structure, realizes the control to super lens dynamic focus；3 kinds of phase modulation unit structures of array arrangement have the function of multiple phase selection on substrate, realize THz wave beam convergence.Under laser irradiation, x- linear polarization THz wave vertical incidence, remote y- polarization wave beam is focused；Under non-laser irradiation, x- linear polarization THz wave vertical incidence is focused into distance y- polarization wave beam.It is final to realize remote, perifocus switching at runtime, complete the dynamic modulation of super lens.
Description
Technical field
The invention belongs to function solenoid device arts, emphasis is directed to terahertz wave band dynamic function device.
Background technique
Dynamic control or the research of tunable THz devices are exactly that a popular direction is also future device at present
One development trend of research.The research of tunable devices based on Meta Materials is typically based on different external conditions such as electric field, magnetic
Field, temperature, light stimulus etc. change the frequency or amplitude of resonance point.For example photoconductive semiconductors material is controlled by laser
The tunable THz modulators of design such as the resistance of conductivity or temperature control superconductor.This in the past will pass through change tie
The size of structure come obtain it is tunable compare, more save the cost does not need repeatedly to process test, and a template can be real
It is existing.
Distinguish according to modulation system, Terahertz modulation technique can be generally divided into 2 kinds of methods: one kind is tune indirectly
System is based on existing microwave communication techniques, using in low frequency microwave section modulation system, pass through frequency doubling technology to Terahertz frequency range reality
Existing communication process；Another kind is loaded directly into modulated signal on THz source, realizes Terahertz channel radio directly to modulate
Letter.From the point of view of current research conditions, the characteristics of directly modulation can make full use of THz wave is generally believed, realize high speed great Rong
Amount communication.
The application that traditional lens are suffered from and its extensively sent out in the every field of production.Lens are also precision optical instrument
Necessary part, but lens are made, the lens for being particularly applied to precision optics equipment need the manufacturing technology at tip.Modern instrument
Demand of the device equipment to micromation and high aperture lens, is also very big challenge for manufacturing industry most advanced at present.Using super
Surface devises numerous lens based on super surface to the control ability of amplitude and phase, domestic and foreign scholars.But these are super
Lens once form, focus fixed single；Or single focal point, or different distance is presented for different types of wave beam
Wave beam convergence, cannot achieve focus dynamic modulation.
Summary of the invention
It is single to solve existing Terahertz lens focus for above-mentioned there are problem or deficiency, it cannot achieve focus dynamic
The problem of modulation, the present invention provides one kind to be based on VO2Dynamic Terahertz super lens.
A kind of dynamic Terahertz super lens based on vanadium dioxide, comprising: quartz substrate, phase modulation unit structure.
The phase modulation unit structure is vanadium dioxide c-opening ring, metal c-opening ring and vanadium dioxide and gold
The compound c-opening ring belonged to；Wherein, the both ends of vanadium dioxide arc and metal composite c-opening ring are vanadium dioxide arc, and centre is
Metal.
All phase modulation unit structures are arranged in circumference array according to phase focusing demand on a quartz substrate；And pass through
Vanadium dioxide metallic state and medium state are controlled to control the transmission phase of THz wave, to realize that focus switches.
The setting method of specific c-opening ring is as follows: according to the phase focusing formula of super lens
Wherein, Ф is SPA sudden phase anomalies value, and F is the focal length of lens, and R is the radially outer distance of lens, and λ is wavelength, and k is
One arbitrary integer.Certain point is chosen in substrate as lens centre, while determining structural cycle, then according to set
Structure specific location calculates phase modulation value in focus and lens.
Then, according to each specific radial position phase value calculated, the openings of sizes of the position split ring is adjusted
With opening towards to realize cellular construction in the phase-modulation of specific location.
Bifocus is preset according to super lens focus characteristics, two groups of corresponding phase-modulation numerical value is calculated, then obtains two
Two groups of structural parameters, are then integrated into one group of framework by group structural parameters.
Select the structural parameters of perifocus in bifocus, the structural parameters as metal c-opening ring；It is remote burnt in bifocus
The structural parameters of point, the structural parameters as vanadium dioxide c-opening ring；Metal c-opening ring and vanadium dioxide c-opening ring
Overlapping position uses vanadium dioxide arc and metal composite c-opening ring.
The vanadium dioxide arc and metal composite c-opening ring are to join the structure of over focus on the basis of becket
Number load is got on, and finally two groups of structural parameters are integrated into one group of structure and are obtained.
Each structure brings formula into the distance R of lens centre to solve the phase modulation values Φ of specific location.To
Realizing that wave beam focuses, 2 π must be reached by focusing phase-modulation range, i.e., in calculating, phase that lens are modulated according to locations of structures
Φ has to be larger than or is equal to 2 π.Radial distance is remoter, and required phase modulation is bigger, reaches the locations of structures R of 2 π phase-modulations just
It is the edge of lens.The phase-modulation numerical value for calculating one group of lens radial position carries out structure size further according to phase value
Emulation modulation and optimization.
The basic structure of the lens is c-opening ring structure, the c type structure that oblique 45° angle is placed, and polarization may be implemented and turn
It changes, the transmitted wave after polarization conversion has large-scale phase change, adjusts the adjustable polarization conversion phase of openings of sizes.Together
One opening direction, is open bigger, phase modulation is bigger.According to geometric phase modulation principle it is found that 45 ° of inclined c type structures,
It is rotated by 90 ° under same openings of sizes, phase change can increase by 180 °.
Further, the metal material in the phase modulation unit structure is gold, aluminium, copper or silver.
The present invention combines vanadium dioxide with metal structure, using vanadium dioxide c-opening ring, metal c-opening ring
And the phase modulation unit structure of vanadium dioxide and metal composite split ring, according to the size of structure, opening direction and opening
The discontinuous variation of phase is realized in ring material transformation；Using the phase-change characteristic of vanadium dioxide, change the mode of resonance of structure, thus
Change the transmission phase of structure, realizes the control to super lens dynamic focus；3 kinds of phase-modulation lists of array arrangement on substrate
Meta structure has the function of multiple phase selection, realizes THz wave beam convergence.Under laser irradiation, x- linear polarization THz wave
Vertical incidence, remote y- polarization wave beam focus；Under non-laser irradiation, x- linear polarization THz wave vertical incidence, into distance
Y- polarization wave beam focuses.It is final to realize remote, perifocus switching at runtime, complete the dynamic modulation of super lens.
The invention has the advantages that (1) realizes the modulation effect of a structure quarter-phase.(2) there is centainly plastic
Property: it is protecting
Hold unit overall structure it is constant in the case where, by change openings of sizes, to change transmission phase；Substantially change circle
Ring radius, with modulation band position, modulators modulate frequency is up to 0.82T.(3) its array element is a kind of two-dimensional surface knot
Structure can realize that technical maturity is easy to make, and the design scheme for avoiding complicated stereochemical structure is brought by microfabrication means
Highly difficult processing.(4) present invention is the THz wave phase converter of transmission-type, compared to reflective phase converter, is operated simpler
It is single, using more convenient.(5) structural unit of the invention, size adjusting, transmission phase variation can cover 0~2 π, each unit
Transmissivity stablizes 0.3~0.5, and focusing effect is stablized.
Detailed description of the invention
Fig. 1 is super lens entirety two-dimensional structure design scheme schematic diagram of the present invention, in which: Fig. 1-1 is the present invention whole two
Structural schematic diagram is tieed up, Fig. 1-2 is the compound c-opening ring schematic diagram of vanadium dioxide and metal, and Fig. 1-3 is the phase tune of embodiment
Cellular construction figure processed；
When the non-laser irradiation of Fig. 2, the unit amplitude phase diagram of embodiment；
When Fig. 3 laser irradiation, the unit amplitude phase diagram of embodiment；
Fig. 4 is embodiment focus switching emulation field figure, in which: Fig. 4-4, which is that embodiment is far burnt, focuses emulation side view section
Figure, Fig. 4-5 are that the remote coke focusing emulation focus section figure of embodiment is schemed, and Fig. 4-6 emulates side view section for nearly burnt focus of embodiment
Field figure, Fig. 4-7 are the nearly burnt focusing emulation focus section figure of embodiment.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.
The present embodiment designs 16 cellular constructions that can cover 0~2 π according to phase-modulation principle, 16 structure institutes
The phase of modulation is according to phase focusing formula:
Calculate gained (Ф SPA sudden phase anomalies value；The focal length of F lens；The radially outer distance of R lens；λ wavelength；K is one
Arbitrary integer).
The basic structure of the lens is c-opening ring structure, and pole may be implemented in the c type open ring structure that oblique 45° angle is placed
Change conversion, the transmitted wave after polarization conversion has large-scale phase change, adjusts the adjustable polarization conversion phase of openings of sizes
Position, the 1-12 structure obtain accordingly.According to geometric phase modulation principle it is found that 45 ° of inclined c type structures are being rotated by 90 °
In the case of, phase change is 180 °.13-16 structure has done 90 ° of rotations in the case where being open variation.C-type structure is adjusted to open
Mouth size adjusts opening towards to change polarization conversion efficiency, and then the transmission phase of change cellular construction to adjust resonant type
Position.
According to super lens focus characteristics, the focus of super lens is preset, is converged with calculating from the THz wave of different location
The phase-modulation required for the focal point.Accordingly, the super lens for obtaining unit period P=200um, in default focus 10mm
16 cellular constructions are needed just to be able to satisfy the phase-modulation of 2 π ranges；Need 9 cellular constructions that could expire in default focus 3mm
The phase-modulation of 2 π ranges of foot.16 structural modulation phases and structural openings angle such as table one.
Table one: structural modulation phase and opening angle
Using the composite construction of two kinds of materials, by two focus structure parameters in one group of 16 cellular construction (Fig. 1-2)
Middle selectivity performance.The openings of sizes of C ring metal part meets 3mm focusing, uses VO2Arc extends c ring, changes c ring opening, makes most
Whole all structural openings meet 10mm focusing.Just the resonant ring of 16 composite constructions has been obtained.According to phase demand adjustment two
The accounting of vanadium oxide obtains 16 recombiner unit structures.Under non-laser irradiation, medium state is presented in VO2, and metal part meets
3mm is focused；Under certain laser irradiation, metallic state is presented in VO2, and metal part and the whole 10mm that meets in the part VO2 gather
It is burnt.
16 structures using locating fixed modulation position to modulation plan dot as radius, uniformly translated in the way of circumference
Arrangement.First lap is two structures, and the second circle is 8 structures, successively every outward to increase by a circle, increases by 4 structures, ultimately forms
Plane modulation array (Fig. 1-1).16 structures rotate 2 π according to locating radius and rearrange a circumference two-dimensional surface (1-
1).On a quartz substrate, VO is crossed2Film makes designed VO by lithography2Shape and structure, the phase tune as the second focus
System.Then one layer of golden film is crossed, makes the phase modulating structure of the first focus phase by lithography.In metal and VO2Junction material
Overlapped coverage 2-5um (Fig. 1-3) is carried out to guarantee that material connection is errorless.
The structure is in VO2When medium state, the corresponding phase change of metal part cellular construction as shown in Figure 2 covers 2 π models
It encloses and transmissivity is basically stable at 0.25 or more:
The structure is in VO2When metallic state, VO2A bulk metal ring, metal part and VO are constituted with metal2All join part
With modulation, 16 structures of super lens have new phase-modulation effect, and the corresponding phase of 16 units as shown in Figure 3 covers 2
π phase, transmissivity are stablized 0.3 or more.
Emulation is focused to the structure using CST simulation software, simulates focus switching state.VO2When metallic state, side
Observation, terahertz wave beam converge at 7.5mm after the lens (Fig. 4-4)；Cross section at 7.5mm, field figure are focused into a dot (figure
4-5).Work as VO2When in medium state, terahertz wave beam is converged at 2.5mm after the lens (Fig. 4-6)；Cross section at 2.5mm, field
Figure is focused into a dot (Fig. 4-7).
To sum up, the present invention realizes the modulation effect of a structure quarter-phase, and modulating frequency is up to 0.82T.
Claims (2)
1. one kind is based on VO2Dynamic Terahertz super lens, it is characterised in that:
It include: quartz substrate and phase modulation unit structure；
The phase modulation unit structure is vanadium dioxide c-opening ring, metal c-opening ring and vanadium dioxide and metal
Compound c-opening ring；Wherein, the both ends of vanadium dioxide arc and metal composite c-opening ring are vanadium dioxide arc, and centre is gold
Belong to；
All phase modulation unit structures are arranged in circumference array according to phase focusing demand on a quartz substrate；And pass through control
Vanadium dioxide metallic state and medium state control the transmission phase of THz wave, to realize that focus switches；
The setting method of specific c-opening ring is as follows: according to the phase focusing formula of super lens
Wherein, Ф is SPA sudden phase anomalies value, and F is the focal length of lens, and R is the radially outer distance of lens, and λ is wavelength, and k is one
Arbitrary integer；Certain point is chosen in substrate as lens centre, while determining structural cycle, then according to set focus
Phase modulation value is calculated with structure specific location on lens；
Then, it according to each specific radial position phase value calculated, adjusts the openings of sizes of the position split ring and opens
Mouth is towards to realize cellular construction in the phase-modulation of specific location；
Bifocus is preset according to super lens focus characteristics, two groups of corresponding phase-modulation numerical value is calculated, then obtains two groups of knots
Then two groups of structural parameters are integrated into one group of framework by structure parameter；
Select the structural parameters of perifocus in bifocus, the structural parameters as metal c-opening ring；Over focus in bifocus
Structural parameters, the structural parameters as vanadium dioxide c-opening ring；Metal c-opening ring and vanadium dioxide c-opening ring are overlapping
Position use vanadium dioxide arc and metal composite c-opening ring；
The vanadium dioxide arc and metal composite c-opening ring are to add the structural parameters of over focus on the basis of becket
Load gets on, and finally two groups of structural parameters are integrated into one group of structure and are obtained；
R is brought into formula to solve phase modulation values Φ, Φ >=2 π of specific location；Calculate one group of lens radial position
Phase-modulation numerical value carries out emulation modulation and optimization to structure size further according to phase value.
2. being based on VO as described in claim 12Dynamic Terahertz super lens, it is characterised in that: the phase modulation unit structure
In metal material be gold, aluminium, copper or silver.
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| CN201910326566.6A CN110133759B (en) | 2019-04-23 | 2019-04-23 | Based on VO2Dynamic terahertz superlens |
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| CN201910326566.6A CN110133759B (en) | 2019-04-23 | 2019-04-23 | Based on VO2Dynamic terahertz superlens |
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Cited By (9)
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| CN110739549A (en) * | 2019-10-29 | 2020-01-31 | Oppo广东移动通信有限公司 | Array lens, lens antenna, and electronic apparatus |
| CN110943303A (en) * | 2019-10-29 | 2020-03-31 | Oppo广东移动通信有限公司 | Array lens, lens antenna, and electronic apparatus |
| CN111370870A (en) * | 2020-03-19 | 2020-07-03 | Oppo广东移动通信有限公司 | Antenna device and electronic apparatus |
| CN112068228A (en) * | 2020-07-31 | 2020-12-11 | 国家纳米科学中心 | Plane focusing lens device based on phonon polarized waves |
| CN113325496A (en) * | 2021-05-13 | 2021-08-31 | 中国科学院上海微系统与信息技术研究所 | Sub-wavelength antenna, wavelength-controllable superlens and superlens design method |
| CN113871820A (en) * | 2021-09-03 | 2021-12-31 | 中国科学院空天信息研究院粤港澳大湾区研究院 | Terahertz carrier wave envelope phase shifter |
| CN114361805A (en) * | 2022-01-04 | 2022-04-15 | 电子科技大学 | Terahertz metamaterial adjustable directional selector |
| CN114624878A (en) * | 2022-03-24 | 2022-06-14 | 深圳迈塔兰斯科技有限公司 | Method and device for designing optical system |
| CN114755847A (en) * | 2022-05-09 | 2022-07-15 | 电子科技大学 | Based on VO2Switchable terahertz wave beam regulation and control device and preparation method thereof |
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| CN110943303A (en) * | 2019-10-29 | 2020-03-31 | Oppo广东移动通信有限公司 | Array lens, lens antenna, and electronic apparatus |
| CN110739549A (en) * | 2019-10-29 | 2020-01-31 | Oppo广东移动通信有限公司 | Array lens, lens antenna, and electronic apparatus |
| CN110739549B (en) * | 2019-10-29 | 2021-05-11 | Oppo广东移动通信有限公司 | Array lens, lens antenna, and electronic apparatus |
| WO2021184986A1 (en) * | 2020-03-19 | 2021-09-23 | Oppo广东移动通信有限公司 | Antenna apparatus and electronic device |
| CN111370870A (en) * | 2020-03-19 | 2020-07-03 | Oppo广东移动通信有限公司 | Antenna device and electronic apparatus |
| CN112068228A (en) * | 2020-07-31 | 2020-12-11 | 国家纳米科学中心 | Plane focusing lens device based on phonon polarized waves |
| CN112068228B (en) * | 2020-07-31 | 2022-04-26 | 国家纳米科学中心 | Plane focusing lens device based on phonon polarized waves |
| CN113325496A (en) * | 2021-05-13 | 2021-08-31 | 中国科学院上海微系统与信息技术研究所 | Sub-wavelength antenna, wavelength-controllable superlens and superlens design method |
| CN113871820A (en) * | 2021-09-03 | 2021-12-31 | 中国科学院空天信息研究院粤港澳大湾区研究院 | Terahertz carrier wave envelope phase shifter |
| CN113871820B (en) * | 2021-09-03 | 2022-07-19 | 广东大湾区空天信息研究院 | Terahertz carrier envelope phase shifter |
| CN114361805A (en) * | 2022-01-04 | 2022-04-15 | 电子科技大学 | Terahertz metamaterial adjustable directional selector |
| CN114624878A (en) * | 2022-03-24 | 2022-06-14 | 深圳迈塔兰斯科技有限公司 | Method and device for designing optical system |
| CN114624878B (en) * | 2022-03-24 | 2024-03-22 | 深圳迈塔兰斯科技有限公司 | Method and device for designing optical system |
| CN114755847A (en) * | 2022-05-09 | 2022-07-15 | 电子科技大学 | Based on VO2Switchable terahertz wave beam regulation and control device and preparation method thereof |
| CN114755847B (en) * | 2022-05-09 | 2023-11-14 | 电子科技大学 | VO-based 2 Switchable terahertz wave beam regulating device and preparation method thereof |
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