CN115020987A - Method for realizing terahertz broadband absorption and polarization conversion dual-function metamaterial - Google Patents
Method for realizing terahertz broadband absorption and polarization conversion dual-function metamaterial Download PDFInfo
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- CN115020987A CN115020987A CN202210452763.4A CN202210452763A CN115020987A CN 115020987 A CN115020987 A CN 115020987A CN 202210452763 A CN202210452763 A CN 202210452763A CN 115020987 A CN115020987 A CN 115020987A
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- vanadium dioxide
- metamaterial
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- polarization conversion
- ring patch
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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
- H01Q15/0086—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices having materials with a synthesized negative refractive index, e.g. metamaterials or left-handed materials
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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
- H01Q15/002—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective said selective devices being reconfigurable or tunable, e.g. using switches or diodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
- H01Q15/0026—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective said selective devices having a stacked geometry or having multiple layers
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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 invention discloses a terahertz broadband absorption and polarization conversion dual-function metamaterial realization method which comprises a metamaterial unit, wherein a base reflecting plate is fixedly installed at the bottom of the inner side of the metamaterial unit, a polyethylene cycloolefin copolymer (ToPaS) dielectric layer is filled at the top of the base reflecting plate, a vanadium dioxide thin film layer is fixedly installed at the top of the polyethylene cycloolefin copolymer (ToPaS) dielectric layer, a rectangular strip is fixedly installed at the bottom of the vanadium dioxide thin film layer, an outer vanadium dioxide concentric ring patch is installed at the top of the polyethylene cycloolefin copolymer dielectric layer, and an inner vanadium dioxide concentric ring patch is fixedly installed at the inner side of the outer vanadium dioxide concentric ring patch. The invention provides a metamaterial device with dual functions of broadband absorption and polarization conversion in a terahertz frequency band, and vanadium dioxide is changed between an insulating state and a metal state by changing external conditions, so that dual-function switching of the metamaterial device is realized.
Description
Technical Field
The invention belongs to the field of electromagnetic metamaterials, and particularly relates to a terahertz broadband absorption and polarization conversion dual-function metamaterial implementation method.
Background
The terahertz electromagnetic wave has low energy and strong penetrability, and is very suitable for being applied to security inspection equipment, biological macromolecules can have different absorption peaks in a terahertz waveband, the characteristics of the absorption peaks are analyzed, the identification of articles can be realized, the electromagnetic metamaterial is an artificial electromagnetic material formed by periodically combining resonance structural units according to a certain arrangement mode, the special electromagnetic property which natural materials do not have in the nature can be realized by reasonably designing the structural units, the metamaterial absorber can completely absorb incident electromagnetic waves, and the incident energy is consumed in a dielectric loss and ohmic loss mode; compared with the traditional devices, the wave absorbing device and the polarization conversion device based on the metamaterial have the advantages of high efficiency, thin thickness, easy integration and artificial design, and have higher application value in the fields of military, civil life and the like.
Disclosure of Invention
The invention aims to provide a method for realizing a terahertz broadband absorption and polarization conversion dual-function metamaterial, which provides a metamaterial device with broadband absorption and polarization conversion dual-function in a terahertz frequency band through a phase-change material vanadium dioxide, changes external conditions, and changes the vanadium dioxide between an insulation state and a metal state, thereby realizing dual-function switching of the metamaterial device.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the terahertz broadband absorption and polarization conversion dual-function metamaterial comprises a metamaterial unit, wherein a substrate reflecting plate is fixedly installed at the bottom of the inner side of the metamaterial unit, a polyethylene cycloolefin copolymer ToPaS dielectric layer is filled at the top of the substrate reflecting plate, a vanadium dioxide thin film layer is fixedly installed at the top of the polyethylene cycloolefin copolymer ToPaS dielectric layer, a rectangular strip is fixedly installed at the bottom of the vanadium dioxide thin film layer, a polyethylene cycloolefin copolymer dielectric layer is installed at the top of the vanadium dioxide thin film layer, an outer vanadium dioxide concentric ring patch is installed at the top of the polyethylene cycloolefin copolymer dielectric layer, and an inner vanadium dioxide concentric ring patch is fixedly installed at the inner side of the outer vanadium dioxide concentric ring patch.
Further, the length of the rectangular bar is consistent with the metamaterial unit, and the width of the rectangular bar is 5 microns.
Further, base reflecting plate and rectangular strip adopt gold material, and base reflecting plate and rectangular conductivity do, base reflecting plate and rectangular thickness of being 0.2 micron.
Further, the radius of the outer vanadium dioxide concentric ring patch is 12 micrometers, the radius of the inner vanadium dioxide concentric ring patch is 7 micrometers, the width of the inner vanadium dioxide concentric ring patch and the width of the outer vanadium dioxide concentric ring patch are 3 micrometers, and the thickness of the inner vanadium dioxide concentric ring patch and the thickness of the outer vanadium dioxide concentric ring patch are 0.2 micrometer.
Further, the thickness of the vanadium dioxide thin film layer is 0.2 micrometer.
Further, the thickness of the medium layer of the polyethylene cycloolefin copolymer is 10 microns, and the thickness of the medium layer of the polyethylene cycloolefin copolymer ToPaS is 26 microns.
The invention has the following beneficial effects:
the invention provides a metamaterial device with dual functions of broadband absorption and polarization conversion in a terahertz frequency band based on a phase-change material vanadium dioxide, and the vanadium dioxide is changed between an insulating state and a metal state by changing external conditions, so that the dual-function switching of the metamaterial device is realized.
Of course, it is not necessary for any product to practice the invention to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic axial view of the material of the present invention;
FIG. 2 is a schematic structural diagram of the front side of the material of the present invention;
FIG. 3 is a schematic top view of the material of the present invention.
In the figure: 1. a polyethylene cyclic olefin copolymer medium layer; 2. a vanadium dioxide thin film layer; 3. A polyethylene cycloolefin copolymer ToPaS dielectric layer; 4. a base reflector plate; 5. an outer vanadium dioxide concentric ring patch; 6. inner vanadium dioxide concentric ring paster; 7. a metamaterial unit; 8. a rectangular strip.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "opening," "upper," "lower," "thickness," "top," "middle," "length," "inner," "periphery," "side," "end," "bottom," and the like are used in an orientation or positional relationship indicated for ease of description and simplicity of description, and do not indicate or imply that the referenced components or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be considered as limiting.
As shown in fig. 1-3, a terahertz broadband absorption and polarization conversion dual-function metamaterial implementation method includes a metamaterial unit 7, a base reflector plate 4 is fixedly installed at the bottom of the inner side of the metamaterial unit 7, a polyethylene cycloolefin copolymer ToPaS dielectric layer 3 is filled at the top of the base reflector plate 4, a vanadium dioxide thin layer 2 is fixedly installed at the top of the polyethylene cycloolefin copolymer ToPaS dielectric layer 3, the thickness of the vanadium dioxide thin layer 2 is 0.2 micrometer, a rectangular strip 8 is fixedly installed at the bottom of the vanadium dioxide thin layer 2, a polyethylene cycloolefin copolymer 1 is installed at the top of the vanadium dioxide thin layer 2, an outer vanadium dioxide concentric ring patch 5 is installed at the top of the polyethylene cycloolefin copolymer dielectric layer 1, and an inner vanadium dioxide concentric ring patch 6 is fixedly installed at the inner side of the outer vanadium dioxide concentric ring patch 5.
The width of the metamaterial unit 7 is 33 microns and the length of the metamaterial unit 7 is 33 microns.
The base reflector 4 and the rectangular strip 8 are made of gold materials, the electrical conductivity of the base reflector 4 and the rectangular strip 8 is 0.2 micrometer, and the thickness of the base reflector 4 and the rectangular strip 8 is 0.2 micrometer.
The radius of the outer vanadium dioxide concentric ring patch 5 is 12 micrometers, the radius of the inner vanadium dioxide concentric ring patch 6 is 7 micrometers, the width of the inner vanadium dioxide concentric ring patch 6 and the width of the outer vanadium dioxide concentric ring patch 5 are 3 micrometers, and the thickness of the inner vanadium dioxide concentric ring patch 6 and the thickness of the outer vanadium dioxide concentric ring patch 5 are 0.2 micrometer.
The thickness of the medium layer 1 of the polyethylene cycloolefin copolymer was 10 microns, and the thickness of the medium layer 3 of the polyethylene cycloolefin copolymer ToPaS was 26 microns.
The working principle is as follows: vanadium dioxide is a metal oxide which can realize switching between an insulating state and a metal state, when the temperature reaches 68 ℃, the property of the vanadium dioxide can be changed greatly, and electromagnetic parameters such as conductivity, refractive index and the like can be changed suddenly.
The implementation steps are that a CST microwave working chamber is used for establishing a metamaterial model, boundary conditions are set as unit cell boundaries in the X, Y direction, boundary conditions are set as open boundaries in the Z direction, and TE polarized waves polarized along the Y-axis direction are perpendicularly incident on the surface of the structure. And (3) subdividing the metamaterial model by using a tetrahedral mesh, selecting an adaptive mesh technology to improve the simulation speed and ensure the simulation precision, and solving the S parameter of the metamaterial by using a frequency domain solver simulation analysis based on a finite element algorithm. The terahertz waveband metamaterial structure designed by the method has the following two functions: when the VO2 is in a metal state, the upper VO2 concentric resonance ring, the middle ToPaS dielectric layer and the VO2 thin film reflecting plate of the metamaterial jointly form a traditional metamaterial three-layer resonator, incident electromagnetic waves are coupled with the metamaterial within a wider terahertz frequency band, a terahertz broadband absorber is realized, when the VO2 is in an insulation state, the terahertz broadband absorber is almost transparent relative to the terahertz electromagnetic waves, the incident electromagnetic waves realize polarization conversion of incident linearly polarized waves under the coupling action of the gold rectangular strip, the ToPaS dielectric layer and the bottom gold reflecting plate, and the conversion efficiency is higher within the broadband.
Reference throughout this specification to the description of "one embodiment," "an example," "a specific example," or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention, and the illustrated representation of the term does not necessarily refer to the same embodiment or example, and the particular feature, structure, material, or characteristic described may be combined in any suitable manner in any one or more embodiments or examples, preferred embodiments of the invention being disclosed above merely to help illustrate the invention, preferred embodiments not being exhaustive of all the details, nor limiting the invention to the specific embodiments described, and obviously many modifications and variations are possible in light of the present specification, which has been selected and described specifically, for the purposes of better explaining the principles and practical applications of the present invention, so that those skilled in the art can better understand and utilize the invention, the present invention is limited only by the claims and their full scope and equivalents.
Claims (7)
1. The terahertz broadband absorption and polarization conversion dual-function metamaterial implementation method comprises a metamaterial unit (7), it is characterized in that the bottom of the inner side of the metamaterial unit (7) is fixedly provided with a substrate reflecting plate (4), the top of the base reflector plate (4) is filled with a polyethylene cycloolefin copolymer ToPaS dielectric layer (3), the top of the polyethylene cycloolefin copolymer ToPaS dielectric layer (3) is fixedly provided with a vanadium dioxide thin film layer (2), the bottom of the vanadium dioxide thin film layer (2) is fixedly provided with a rectangular strip (8), the top of the vanadium dioxide film layer (2) is provided with a polyethylene cycloolefin copolymer medium layer (1), the top of the polyethylene cycloolefin copolymer medium layer (1) is provided with an outer vanadium dioxide concentric ring patch (5), and an inner vanadium dioxide concentric ring patch (6) is fixedly arranged on the inner side of the outer vanadium dioxide concentric ring patch (5).
2. The terahertz broadband absorption and polarization conversion dual-function metamaterial according to claim 1, wherein the width of the metamaterial unit (7) is 33 micrometers, and the length of the metamaterial unit (7) is 33 micrometers.
3. The terahertz broadband absorption and polarization conversion dual-function metamaterial implementation method as claimed in claim 1, wherein the length of the rectangular strip (8) is consistent with that of the metamaterial unit (7), and the width of the rectangular strip (8) is 5 microns.
4. The terahertz broadband absorption and polarization conversion dual-function metamaterial implementation method as claimed in claim 1, wherein the base reflective plate (4) and the rectangular strip (8) are made of gold material, and the electrical conductivity of the base reflective plate (4) and the rectangular strip (8) is that the thickness of the base reflective plate (4) and the rectangular strip (8) is 0.2 μm.
5. The terahertz broadband absorption and polarization conversion dual-function metamaterial according to claim 1, wherein the radius of the outer vanadium dioxide concentric ring patch (5) is 12 micrometers, the radius of the inner vanadium dioxide concentric ring patch (6) is 7 micrometers, the widths of the inner vanadium dioxide concentric ring patch (6) and the outer vanadium dioxide concentric ring patch (5) are 3 micrometers, and the thicknesses of the inner vanadium dioxide concentric ring patch (6) and the outer vanadium dioxide concentric ring patch (5) are 0.2 micrometer.
6. The terahertz broadband absorption and polarization conversion dual-function metamaterial according to claim 1, wherein the thickness of the vanadium dioxide thin film layer (2) is 0.2 microns.
7. The terahertz broadband absorption and polarization conversion dual-function metamaterial according to claim 1, wherein the thickness of the polyethylene cyclic olefin copolymer dielectric layer (1) is 10 microns, and the thickness of the polyethylene cyclic olefin copolymer ToPaS dielectric layer (3) is 26 microns.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117293553A (en) * | 2023-09-06 | 2023-12-26 | 西安理工大学 | Adjustable broadband terahertz absorber of patterned vanadium dioxide |
| EP4344861A1 (en) * | 2022-09-30 | 2024-04-03 | EMPA Eidgenössische Materialprüfungs- und Forschungsanstalt | Ultra-thin optical elements and production method thereof |
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2022
- 2022-04-27 CN CN202210452763.4A patent/CN115020987A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4344861A1 (en) * | 2022-09-30 | 2024-04-03 | EMPA Eidgenössische Materialprüfungs- und Forschungsanstalt | Ultra-thin optical elements and production method thereof |
| WO2024068591A1 (en) | 2022-09-30 | 2024-04-04 | Empa Eidgenössische Materialprüfungs- Und Forschungsanstalt | Ultra-thin optical elements and production method thereof |
| CN117293553A (en) * | 2023-09-06 | 2023-12-26 | 西安理工大学 | Adjustable broadband terahertz absorber of patterned vanadium dioxide |
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