CN110492250A - A kind of tunable super lens of flexibility based on the super surface of dynamic - Google Patents

A kind of tunable super lens of flexibility based on the super surface of dynamic Download PDF

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Publication number
CN110492250A
CN110492250A CN201910703205.9A CN201910703205A CN110492250A CN 110492250 A CN110492250 A CN 110492250A CN 201910703205 A CN201910703205 A CN 201910703205A CN 110492250 A CN110492250 A CN 110492250A
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super
tunable
phase
lens
super lens
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Inventor
陈婷
张雅鑫
杨梓强
寇伟
梁士雄
施奇武
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University of Electronic Science and Technology of China
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University of Electronic Science and Technology of China
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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
    • H01Q15/0046—Theoretical analysis and design methods of such selective devices
    • 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
    • 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
    • H01Q15/08—Refracting or diffracting devices, e.g. lens, prism formed of solid dielectric material

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Bioinformatics & Cheminformatics (AREA)
  • Bioinformatics & Computational Biology (AREA)
  • Aerials With Secondary Devices (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

A kind of tunable super lens of flexibility based on the super surface of dynamic, belong to function solenoid device arts.The tunable super lens of flexibility include flexible substrates, and it is formed in the phase modulating structure on flexible substrates, the phase modulating structure includes the phase modulation unit structure of multiple array arrangements, and the phase modulation unit structure is the compound annulus that vanadium dioxide and metal form.A kind of tunable super lens of flexibility based on super surface provided by the invention can be realized the focusing of terahertz wave beam and the switching of parallel output function, realize that the function of super lens is tunable by the state of laser controlling vanadium dioxide；Moreover, realize focus it is continuously adjustable while, wave beam is realized on the curved surface of fixed curvature and is focused and the parallel function switch exported.

Description

A kind of tunable super lens of flexibility based on the super surface of dynamic
Technical field
The invention belongs to function solenoid device arts, and in particular to a kind of flexibility based on super surface is tunable super Mirror.
Background technique
Tunable THz devices are that the popular direction studied at present is also a development of future device research Trend.The research of tunable devices based on Meta Materials is usually by different external condition, such as light, electric field, magnetic field, temperature Deng to change the frequency or amplitude of resonance point.For example, controlling the conductivity or temperature of photoconductive semiconductors material by laser The resistance etc. of degree control superconductor, can be obtained tunable THz modulator.It is obtained with traditional size by changing structure Tunability can be compared, and the tunable devices cost is lower, without repeatedly processing test.Classify according to modulation system, too Hertz modulation can be divided into two kinds: one is indirect modulation, that is, are based on existing microwave communication techniques, using in the modulation of low frequency microwave section Mode realizes communication process by frequency doubling technology to Terahertz frequency range；Another kind is directly modulates, i.e., on THz source directly Load-modulate signal realizes Terahertz wireless communication.
Lens are the necessary parts of precision optical instrument, and the lens that production lens are particularly applied to precision optics equipment need Want the manufacturing technology at tip.Demand of the Modern Scientific Instruments in Chinese to micromation and high aperture lens, for manufacture most advanced at present Industry is very big challenge.Using super surface to the control ability of amplitude and phase, researchers are devised largely based on super surface Lens.But these super lens have a single function once forming；Or single focal point, or it is directed to different types of wave The wave beam of Shu Chengxian different distance converges, and for multi-functional tunable super lens, there are also very big development spaces.Meanwhile at present Most of super lens use hard substrate, once machine-shaping cannot achieve curved surface bending and device adherency, it is wide to limit it General application.
Summary of the invention
It is an object of the present invention to for defect existing for background technique, to solve existing Terahertz super lens function list One and the problem of cannot achieve curved surface, propose a kind of flexible tunable super lens based on the super surface of dynamic.
To achieve the above object, The technical solution adopted by the invention is as follows:
A kind of tunable super lens of flexibility based on super surface, including flexible substrates, and be formed on flexible substrates Phase modulating structure, the phase modulating structure includes the phase modulation unit structure of multiple arrays arrangement, the phase tune Cellular construction processed is the compound annulus that vanadium dioxide and metal form.
Further, the flexible substrates are mica or polyimides etc..
Further, in the phase modulation unit structure, metal is gold, aluminium, copper or silver etc..
Further, in the tunable super lens of flexibility, the accounting of becket, the direction of becket opening, unit knot The setting position of structure is adjusted according to focusing phase principle.
Wherein, the phase modulation unit array of structures is arranged on flexible substrates, and the lens is made to be gathered in focus.It is logical The state (metallic state with medium state) for crossing control vanadium dioxide realizes the focusing of THz wave and the switching of parallel output function, into And realize the function harmonizing of super lens.
A kind of implementation method of the tunable super lens of flexibility based on super surface, which comprises the following steps:
Step 1 chooses central point (0,0) of the certain point as super lens on a flexible substrate, then according to the coke of setting The position of point and phase modulation unit structure, is calculated by the following formula to obtain the phase modulation value of corresponding position；
Wherein, Ф (R) is required SPA sudden phase anomalies value, and F is the focal length of super lens, and R is the radial coordinate R (x, y) of super lens, λ is wavelength, and k is arbitrary integer；
Step 2, the phase modulation value of each the cellular construction position obtained according to step 1, adjust the list of corresponding position The accounting of becket and the opening direction of becket in meta structure, to realize the phase-modulation of corresponding unit structure；
Step 3, the becket opening in each unit structure fill vanadium dioxide, form phase modulation unit structure The tunable super lens of flexibility can be obtained in one complete annulus.
A kind of tunable super lens of flexibility based on super surface provided by the invention adopt vanadium dioxide and metal bonding With the opening portion of vanadium dioxide filling c-type becket, cellular construction is made to become a complete circular ring structure；Then two are utilized The phase-change characteristic of vanadium oxide changes the mode of resonance of cellular construction, and then changes the transmission of cellular construction, realizes to super lens function The tuning of energy.Specifically, under laser irradiation, vanadium dioxide is metallic state, and cellular construction is metal ring, the direction x- linear polarization THz wave vertical incidence can be exported in x- direction polarization beam parallel；Under non-laser irradiation, vanadium dioxide is medium state, Cellular construction is the c-type becket with opening, and the direction x- linear polarization THz wave vertical incidence can be poly- in y- direction polarization wave beam It is burnt.It can be seen that by the state of laser controlling vanadium dioxide, the focusing of terahertz wave beam and parallel output function can be realized Switching, realize that the function of super lens is tunable.
A kind of tunable super lens of flexibility based on super surface provided by the invention, using flexible materials such as micas as soft Property substrate, lens can realize curved surface be bent, the function tunability of toroidal lens can be realized.Specifically, it is irradiated in non-laser Under, vanadium dioxide be medium state, cellular construction be band be open c-type becket, the direction x- linear polarization THz wave vertical incidence, It can be focused in y- direction polarization wave beam, and with the increase of curved surface bending degree, focus first becomes larger to become smaller afterwards, realizes super lens The consecutive variations of focal position；Under laser irradiation, vanadium dioxide is metallic state, and cellular construction is metal ring, x- direction line Polarize THz wave vertical incidence, can export, not change with the variation of curved surface in x- direction polarization beam parallel.Thus may be used See, the present invention is based on the tunable super lens of flexibility on super surface realize focus it is continuously adjustable while, in fixed curvature Wave beam is realized on curved surface to focus and the parallel function switch exported.
Compared with prior art, the invention has the benefit that
1, a kind of tunable super lens of flexibility based on super surface provided by the invention, pass through laser controlling vanadium dioxide State, can be realized terahertz wave beam focusing with the switching of parallel output function, realize that the function of super lens is tunable.
2, a kind of tunable super lens of flexibility based on super surface provided by the invention, are realizing the continuously adjustable of focus Meanwhile wave beam is realized on the curved surface of fixed curvature and is focused and the parallel function switch exported.
3, a kind of tunable super lens of flexibility based on super surface provided by the invention, in the item that holding unit structure is constant Under part, by changing metal openings size (i.e. the accounting of vanadium dioxide), i.e., changeable transmission phase.
4, a kind of tunable super lens of flexibility based on super surface provided by the invention, phase modulating structure is that two dimension is flat Face structure can realize that technical maturity is easy to make, and the design for avoiding complicated stereochemical structure is brought by fine process Highly difficult processing.
5, a kind of tunable super lens of flexibility based on super surface provided by the invention, are the THz wave phase modulation of transmission-type Device, compared to reflective phase converter, operation is simpler, using more convenient.
6, a kind of tunable super lens of flexibility based on super surface provided by the invention, by cellular construction, size etc. Adjustment, transmission phase variation can cover 0~2 π, and each unit transmissivity stablizes 0.3~0.5, and focusing effect is stablized.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of tunable super lens of flexibility based on super surface provided by the invention；Wherein, 1- 1 is the schematic diagram of the phase modulating structure of super lens, and 1-2 is the schematic diagram for the compound annulus that vanadium dioxide and metal are formed, 1-3 For the schematic diagram of a big unit structure；1-4 is the phase modulation of 1-3 big unit structure corresponding position；
Fig. 2 is a kind of simulation result diagram of tunable super lens of flexibility based on super surface provided in an embodiment of the present invention； Wherein, 2-5 is the curve focusing analogous diagram that radius of curvature is 6mm, and 2-6 is the curved surface beam parallel output that radius of curvature is 6mm Analogous diagram, 2-7 are the curve focusing analogous diagram that radius of curvature is 3mm, and 2-8 is that the curved surface beam parallel that radius of curvature is 3mm is defeated Analogous diagram out, 2-9 are the curve focusing analogous diagram that radius of curvature is 1.875mm, and 2-10 is the curved surface that radius of curvature is 1.875mm Beam parallel exports analogous diagram.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.
A kind of tunable super lens of flexibility based on super surface provided by the invention, using lens centre as origin, setting is single Then meta structure period P brings the coordinate R (x, y) of each unit structure into formula The phase modulation values Φ (R) of each unit structure corresponding position can be obtained. To realize that wave beam focuses, 2 π must be reached by focusing phase-modulation range, i.e., in calculating, the phase of cellular construction corresponding position Modulation value Φ has to be larger than or is equal to 2 π.Remoter at a distance from axis origin with focusing, the phase of required modulation is bigger.According to calculating The phase modulation values arrived are emulated and are optimized to the size of cellular construction.
A kind of tunable super lens of flexibility based on super surface provided by the invention, the metal part in cellular construction is C Type open ring structure, the c-type structure that oblique 45° angle is placed, may be implemented polarization conversion, and the transmitted wave after polarization conversion has big model The phase change enclosed can regulate and control polarization conversion phase by adjusting openings of sizes.Same opening direction is open bigger, adjusts Phase processed is bigger.According to geometric phase modulation principle it is found that 45 ° of inclined c-type structures, are rotated by 90 ° under same openings of sizes, Phase change can increase by 180 °.
Embodiment
The present embodiment is according to three dimensional Phase modulation principle, and for the frequency point of 0.4THz, P=220 μm of selection cycle, focal length is set It is set to 5mm, phase-modulation two-dimensional structure is as Figure 1-1, and the phase which is modulated is poly- according to three dimensional Phase Burnt formulaIt is calculated, as shown in Figs 1-4.The unit of the lens Structure is circular ring structure, wherein metal part be c-opening ring, 85 μm of annular radii, 15 μm of annular width.Oblique 45° angle is placed C-opening ring structure, polarization conversion may be implemented, the transmitted wave after polarization conversion have large-scale phase change Regulate and control polarization conversion phase by adjusting openings of sizes.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 °.Therefore, c-type structural openings size is adjusted to adjust resonance Type adjusts opening towards to change polarization conversion efficiency, and then the transmission phase of change cellular construction.Then, using dioxy The opening portion for changing vanadium filling c-type becket, makes cellular construction become a complete circular ring structure (Fig. 1-2)；According to structure Modulation principle adjustment metal structure openings of sizes and opening direction obtain one group of big unit structure (Fig. 1-3).Corresponding diagram 1-4 modulation The cellular construction angle and metal openings of phase are towards as shown in table 1.
The opening angle of 1 cellular construction phase modulation of table and direction
10 13 18 31 50 77 105 131 160 12* 55* 109* 151*
13 14 20 33 53 80 107 133 162 13* 60* 111* 153*
18 20 27 40 62 88 114 140 169 18* 68* 115* 159
31 33 40 55 77 101 124 150 178 28* 81* 125* 169*
50 53 62 77 96 116 138 162 189 51* 99* 139* 180*
77 80 88 101 116 133 155 180 27* 74* 115* 155* 19
105 107 114 124 138 155 176 18* 56* 101* 137* 175* 35
131 133 140 150 162 180 18* 50* 93* 127* 160* 15 70
160 162 169 178 189 27* 56* 93* 123* 154* 185* 50 105
12* 13* 18* 28* 51* 74* 101* 127* 154* 183* 38 93 136
55* 60* 68 81* 99* 115* 137* 160* 185* 38 88 129 169
109* 111* 115* 125* 139* 155* 175* 15 50 93 129 165 20
151* 153* 159* 169* 180* 19 35 70 105 136 169 20 75
Note: unit is " ° "；" * " indicates to be rotated by 90 ° for the opening direction without " * ".
According to super lens focus characteristics, which is moved into other symmetrical quadrants according to origin duplication, is obtained Tunable super lens (Fig. 1-1) under to flat state.
The tunable super lens that embodiment obtains are tested and are analyzed with reference to the accompanying drawing:
Can be obtained by electromagnetic simulation software CST emulation: under non-laser irradiation, medium state, the lens are presented in vanadium dioxide When radius of curvature is 6mm, x- line polarization wave focuses on 4.6mm perpendicular to the incidence of lens centre section, the outgoing of y- line polarization wave Locate (Fig. 2-5)；Under laser irradiation, x- line polarization wave is perpendicular to the incidence of lens centre section, x- line polarization wave exiting parallel (figure 2-6)。
Under non-laser irradiation, medium state is presented in vanadium dioxide, and the lens are when radius of curvature is 3mm, x- line polarization wave Perpendicular to the incidence of lens centre section, the outgoing of y- line polarization wave focuses at 4.65mm (Fig. 2-7)；Under laser irradiation, x- line Polarized wave is perpendicular to the incidence of lens centre section, x- line polarization wave exiting parallel (Fig. 2-8).
Under non-laser irradiation, medium state is presented in vanadium dioxide, and the lens are when radius of curvature is 1.875mm, x- line pole Change wave perpendicular to the incidence of lens centre section, the outgoing of y- line polarization wave focuses at 4.23mm (Fig. 2-9)；Under laser irradiation, X- line polarization wave is perpendicular to the incidence of lens centre section, x- line polarization wave exiting parallel (Fig. 2-10).
To sum up, the present invention realizes the tunable function on flexible super surface.

Claims (6)

1. a kind of tunable super lens of flexibility based on super surface, including flexible substrates, and be formed on flexible substrates Phase modulating structure, the phase modulating structure include the phase modulation unit structure of multiple array arrangements, the phase-modulation Cellular construction is the compound annulus that vanadium dioxide and metal form.
2. the flexibility tunable super lens according to claim 1 based on super surface, which is characterized in that the flexible substrates For mica or polyimides.
3. the flexibility tunable super lens according to claim 1 based on super surface, which is characterized in that the phase-modulation In cellular construction, metal is gold, aluminium, copper or silver.
4. the flexibility tunable super lens according to claim 1 based on super surface, which is characterized in that the flexibility is adjustable In humorous super lens, the accounting of becket, direction of becket opening, cellular construction setting position all in accordance with focusing phase principle It is adjusted.
5. the flexibility tunable super lens according to claim 1 based on super surface, which is characterized in that by controlling dioxy Change vanadium state realize THz wave focusing and the switching of parallel output function, and then realization super lens function harmonizing.
6. a kind of implementation method of the tunable super lens of flexibility based on super surface, which comprises the following steps:
Step 1 chooses central point (0,0) of the certain point as super lens on a flexible substrate, then according to the focus of setting with The position of phase modulation unit structure is calculated by the following formula to obtain the phase modulation value of corresponding position；
Wherein, Ф (R) is required SPA sudden phase anomalies value, and F is the focal length of super lens, and R is the radial coordinate R (x, y) of super lens, and λ is Wavelength, k are arbitrary integer；
Step 2, the phase modulation value of each the cellular construction position obtained according to step 1, adjust the unit knot of corresponding position The accounting of becket and the opening direction of becket in structure；
Step 3, the becket opening in each unit structure fill vanadium dioxide, and phase modulation unit structure is made to form one The tunable super lens of flexibility can be obtained in complete annulus.
CN201910703205.9A 2019-07-31 2019-07-31 A kind of tunable super lens of flexibility based on the super surface of dynamic Pending CN110492250A (en)

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Cited By (10)

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CN112305645A (en) * 2020-09-18 2021-02-02 航天恒星科技有限公司 Super surface lens
CN112882259A (en) * 2021-01-13 2021-06-01 天津大学 Vanadium dioxide-based adjustable reflection-type terahertz polarization converter
CN112909564A (en) * 2020-12-31 2021-06-04 华南理工大学 Electrical triggering reconfigurable terahertz digital super surface based on vanadium oxide phase change
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
CN113410627A (en) * 2021-05-11 2021-09-17 华南理工大学 Three-frequency reconfigurable super-surface antenna based on vanadium dioxide thin film and communication equipment
CN114361805A (en) * 2022-01-04 2022-04-15 电子科技大学 Terahertz metamaterial adjustable directional selector
CN114421159A (en) * 2022-01-25 2022-04-29 电子科技大学长三角研究院(湖州) Terahertz digital light-operated coding reflective array
CN114914700A (en) * 2022-05-09 2022-08-16 电子科技大学 Vanadium dioxide-based dynamic multifunctional terahertz reflective array and preparation method thereof
CN116315709A (en) * 2023-03-08 2023-06-23 常熟理工学院 Dynamic adjustable double-frequency-band polarization conversion flexible super-surface
CN116315709B (en) * 2023-03-08 2024-05-24 常熟理工学院 Dynamic adjustable double-frequency-band polarization conversion flexible super-surface

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112305645A (en) * 2020-09-18 2021-02-02 航天恒星科技有限公司 Super surface lens
CN112305645B (en) * 2020-09-18 2022-07-05 航天恒星科技有限公司 Super surface lens
CN112909564A (en) * 2020-12-31 2021-06-04 华南理工大学 Electrical triggering reconfigurable terahertz digital super surface based on vanadium oxide phase change
CN112882259B (en) * 2021-01-13 2022-10-28 天津大学 Vanadium dioxide-based adjustable reflection-type terahertz polarization converter
CN112882259A (en) * 2021-01-13 2021-06-01 天津大学 Vanadium dioxide-based adjustable reflection-type terahertz polarization converter
CN113410627A (en) * 2021-05-11 2021-09-17 华南理工大学 Three-frequency reconfigurable super-surface antenna based on vanadium dioxide thin film and communication equipment
CN113410627B (en) * 2021-05-11 2022-06-14 华南理工大学 Three-frequency reconfigurable super-surface antenna based on vanadium dioxide thin film and communication equipment
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
CN114361805A (en) * 2022-01-04 2022-04-15 电子科技大学 Terahertz metamaterial adjustable directional selector
CN114421159A (en) * 2022-01-25 2022-04-29 电子科技大学长三角研究院(湖州) Terahertz digital light-operated coding reflective array
CN114914700A (en) * 2022-05-09 2022-08-16 电子科技大学 Vanadium dioxide-based dynamic multifunctional terahertz reflective array and preparation method thereof
CN116315709A (en) * 2023-03-08 2023-06-23 常熟理工学院 Dynamic adjustable double-frequency-band polarization conversion flexible super-surface
CN116315709B (en) * 2023-03-08 2024-05-24 常熟理工学院 Dynamic adjustable double-frequency-band polarization conversion flexible super-surface

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