CN113934022A - Terahertz bidirectional polarization converter - Google Patents
Terahertz bidirectional polarization converter Download PDFInfo
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- CN113934022A CN113934022A CN202111207568.7A CN202111207568A CN113934022A CN 113934022 A CN113934022 A CN 113934022A CN 202111207568 A CN202111207568 A CN 202111207568A CN 113934022 A CN113934022 A CN 113934022A
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- 230000010287 polarization Effects 0.000 title claims abstract description 70
- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 40
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 54
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 54
- 239000002184 metal Substances 0.000 claims abstract description 38
- 229910052751 metal Inorganic materials 0.000 claims abstract description 38
- 239000010453 quartz Substances 0.000 claims abstract description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 16
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 10
- 238000004891 communication Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 6
- 238000011161 development Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/0136—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour for the control of polarisation, e.g. state of polarisation [SOP] control, polarisation scrambling, TE-TM mode conversion or separation
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/0102—Constructional details, not otherwise provided for in this subclass
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention discloses a terahertz bidirectional polarization converter. The terahertz wave polarization converter is characterized by comprising a terahertz wave incidence end, a terahertz wave output end and a super-surface polarization converter; the super-surface polarization converter is formed by arranging N multiplied by N structural units on a plane vertical to the input direction of the terahertz wave periodically, wherein N is a natural number; the structural unit sequentially comprises a graphene patch on the top layer, a metal notch square ring, a first quartz medium layer, a graphene layer, a second quartz medium layer and a metal notch square ring on the bottom layer and a graphene patch on the bottom layer from top to bottom. And a 90-degree rotation angle exists between the notch of the square ring with the top metal notch and the notch of the square ring with the bottom metal notch. The terahertz bidirectional polarization converter disclosed by the invention has the characteristics of simple structure, easiness in processing and the like, can be used for carrying out polarization conversion on terahertz waves with different polarization states incident in the positive direction and the negative direction, and meets the application requirements of a terahertz wave communication multiplexing system.
Description
Technical Field
The invention relates to the field of terahertz waves, in particular to a terahertz bidirectional polarization converter.
Background
Terahertz generally refers to electromagnetic radiation with a frequency of 0.1-10 THz, a corresponding wavelength of 0.03-3 mm, and located between microwave and infrared bands. In recent years, with the generation of terahertz radiation and the development of detection technology, terahertz has a great application prospect in the aspects of biomacromolecule detection and biochemical sensing. With the rapid development of the metamaterial technology, research and development of various terahertz wave devices based on the metamaterial arouse high attention of scientific researchers. The reported metamaterial terahertz device has the problems of single terahertz control function, difficulty in regulation and control and complex structure of a structural device, and the development of the terahertz control device is greatly limited.
The development of the terahertz technology needs not only an efficient terahertz wave source and a high-sensitivity detector, but also a high-performance terahertz modulator, a wave absorber, a filter and other related functional devices. The terahertz wave polarization converter serving as a core device of the terahertz system can effectively regulate and control and change the polarization state of terahertz waves. The traditional terahertz wave polarization converter can only realize polarization conversion in a single direction and in a single frequency band, which limits the application range of the polarization conversion device to a great extent. Aiming at the problems, the terahertz bidirectional polarization converter provided by the invention can be used for carrying out polarization conversion on terahertz waves from the positive direction and the negative direction and in different frequency bands, has the characteristics of simple structure, easiness in processing and the like, and meets the application requirements of a terahertz wave communication multiplexing system.
Disclosure of Invention
The invention provides a terahertz bidirectional polarization converter in order to overcome the defects of the prior art.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a terahertz bidirectional polarization converter is characterized by comprising a terahertz wave incident end, a terahertz wave output end and a super-surface polarization converter; the super-surface polarization converter is formed by arranging N multiplied by N structural units on a plane vertical to the input direction of the terahertz wave periodically, wherein N is a natural number; the structural unit sequentially comprises a graphene patch on the top layer, a metal notch square ring, a first quartz medium layer, a graphene layer, a second quartz medium layer and a metal notch square ring on the bottom layer and a graphene patch on the bottom layer from top to bottom. And a 90-degree rotation angle exists between the notch of the square ring with the top metal notch and the notch of the square ring with the bottom metal notch.
The specific parameters of each part in the scheme can adopt the following preferable modes:
preferably, the graphene patch of the top layer is made of graphene, the length and the width of the graphene patch are 20-30 μm, and the thickness of the graphene patch is 0.8-1.2 nm.
Preferably, the material of the square ring of the metal notch on the top layer is copper, the length and the width of the square ring are 40-60 mu m, the width of the opening gap is 6-10 mu m, and the thickness of the square ring is 0.2-0.5 mu m.
Preferably, the first dielectric layer is made of quartz, the length and the width of the first dielectric layer are both 50-70 μm, and the thickness of the first dielectric layer is 4-6 μm.
Preferably, the graphene layer is made of graphene, the length and the width of the graphene layer are both 50-70 μm, and the thickness of the graphene layer is 0.8-1.2 nm.
Preferably, the second dielectric layer is made of quartz, the length and the width of the second dielectric layer are both 50-70 μm, and the thickness of the second dielectric layer is 4-6 μm.
Preferably, the material of the square ring of the metal notch on the bottom layer is copper, the length and the width of the square ring are 40-60 mu m, the width of the opening gap is 6-10 mu m, and the thickness of the square ring is 0.2-0.5 mu m.
Preferably, the graphene patch of the bottom layer is made of graphene, the length and the width of the graphene patch are 20-30 μm, and the thickness of the graphene patch is 0.8-1.2 nm.
Preferably, a 90-degree rotation angle exists between the notch of the square ring with the top metal notch and the notch of the square ring with the bottom metal notch.
The terahertz bidirectional polarization converter disclosed by the invention has the characteristics of simple structure, easiness in processing and the like, can be used for carrying out polarization conversion on terahertz waves with different polarization states incident in the positive direction and the negative direction, and meets the application requirements of a terahertz wave communication multiplexing system.
Drawings
FIG. 1 is a schematic diagram of a three-dimensional array structure and a unit structure of a terahertz bidirectional polarization converter;
FIG. 2 is a cross-sectional view of the cell structure in the AA direction;
FIG. 3 is a schematic diagram of polarization conversion of different incident polarization terahertz waves by a terahertz bidirectional polarization converter under incidence from both the front and the back directions;
FIG. 4 isxThe polarized terahertz-wave is incident from the normal direction,ythe polarized terahertz waves are output from the terahertz bidirectional polarization converter;
FIG. 5 isyThe polarized terahertz-wave is incident from the normal direction,xthe polarized terahertz waves are output from the terahertz bidirectional polarization converter;
FIG. 6 isyThe polarized terahertz-wave is incident from the reverse direction,xthe polarized terahertz waves are output from the terahertz bidirectional polarization converter;
FIG. 7 isxThe polarized terahertz-wave is incident from the reverse direction,ypolarized terahertz waves output from a terahertz bidirectional polarization converterA curve;
FIG. 8 is a schematic diagram of the three-dimensional array structure and cell structure obtained when the gap between the top metal notched square ring and the bottom metal notched square ring is at a 0 ° rotation angle;
FIG. 9 isxThe polarized terahertz wave is incident from the forward direction, and the y-polarized terahertz polarized wave is output from the structure of the graph of FIG. 8;
FIG. 10 isyThe polarized terahertz-wave is incident from the reverse direction,xthe polarized terahertz wave is output from the structure of fig. 8.
Detailed Description
Fig. 1 is a schematic diagram of a three-dimensional array structure and a unit structure of a terahertz bidirectional polarization converter. Fig. 2 is a cross-sectional view of the cell structure in the AA direction. Fig. 3 is a schematic diagram of polarization conversion of different incident polarization terahertz waves by the terahertz bidirectional polarization converter under the incidence from the front direction and the back direction. The terahertz bidirectional polarization converter comprises a terahertz wave incident end 1, a terahertz wave output end 2, a terahertz wave incident end 3, a terahertz wave output end 4 and a super-surface polarization converter 5; the super-surface polarization converter 5 is formed by arranging N multiplied by N structural units 6 on a plane vertical to the input direction of the terahertz wave periodically, wherein N is a natural number; the structural unit 6 sequentially comprises a graphene patch 7 and a metal notch square ring 8 on the top layer, a first quartz medium layer 9, a graphene layer 10, a second quartz medium layer 11, a metal notch square ring 12 on the bottom layer and a graphene patch 13 on the bottom layer from top to bottom; there is a 90 ° angle of rotation between the notch of the top metal notched square ring 8 and the notch of the bottom metal notched square ring 12.
In the terahertz bidirectional polarization converter, the materials and parameters of each component can be as follows:
the graphene patch on the top layer is made of graphene, the length and the width of the graphene patch are 20-30 micrometers, and the thickness of the graphene patch is 0.8-1.2 nm. The metal gap square ring of the top layer is made of copper, the length and the width of the metal gap square ring are 40-60 mu m, the width of an opening gap is 6-10 mu m, and the thickness of the opening gap is 0.2-0.5 mu m. The first dielectric layer is made of quartz, the length and the width of the first dielectric layer are both 50-70 mu m, and the thickness of the first dielectric layer is 4-6 mu m. The graphene layer is made of graphene, the length and the width of the graphene layer are both 50-70 mu m, and the thickness of the graphene layer is 0.8-1.2 nm. The second dielectric layer is made of quartz, the length and the width of the second dielectric layer are both 50-70 micrometers, and the thickness of the second dielectric layer is 4-6 micrometers. The metal gap square ring of the bottom layer is made of copper, the length and the width of the metal gap square ring are 40-60 mu m, the width of an opening gap is 6-10 mu m, and the thickness of the opening gap is 0.2-0.5 mu m. The graphene patch at the bottom layer is made of graphene, the length and the width of the graphene patch are 20-30 micrometers, and the thickness of the graphene patch is 0.8-1.2 nm. And a 90-degree rotation angle exists between the notch of the square ring with the top metal notch and the notch of the square ring with the bottom metal notch.
Specific technical effects of the terahertz bidirectional polarization converter will be described below by way of example.
Example 1
In this embodiment, the structure and the shapes of the components of the terahertz bidirectional polarization converter are as described above, and therefore are not described again. However, the specific parameters of each component are as follows:
when the value of N is 4, 4 × 4 unit structures 6 are arranged on a plane perpendicular to the input direction of the terahertz wave, the graphene patch 7 on the top layer is made of graphene, the length and width of the graphene patch are 24 μm, and the thickness of the graphene patch is 1 nm. The top metal notched square ring 8 was copper, 48 μm in length and width, 8 μm in width of the opening gap, and 0.5 μm in thickness. The first dielectric layer 9 is made of quartz, and has a length and width of 58 μm and a thickness of 5 μm. The graphene layer 10 is made of graphene, the length and the width of the graphene layer are both 58 μm, and the thickness of the graphene layer is 0.8 nm. The second dielectric layer 11 is made of quartz, and has a length and width of 58 μm and a thickness of 4 μm. The bottom metal notched square ring 12 was copper, 48 μm in length and width, 8 μm in open gap width, and 0.5 μm in thickness. The bottom graphene patch 13 is made of graphene, and has a length and width of 24 μm and a thickness of 1 nm. There is a 90 ° angle of rotation between the notch of the top metal notched square ring 8 and the notch of the bottom metal notched square ring 12.
The working mechanism of the terahertz bidirectional polarization converter is as follows: when a terahertz wave signal is incident from the input end 1, the terahertz wave signal is output from the terahertz wave output end 2 under the action of the terahertz bidirectional polarization converter. In addition, when a terahertz wave signal is incident from the input terminal 3, the terahertz wave signal is output from the terahertz wave output terminal 4 by the action of the terahertz bidirectional polarization converter.
When in usexThe polarized terahertz-wave is incident from the normal direction,ythe polarized terahertz wave is output from the terahertz bidirectional polarization converter, the output curve of which is shown in FIG. 4, within two frequency ranges of 1.57THz to 1.85THz and 2.46THz to 2.85THz,xthe polarized terahertz waves incident from the input end 1 can be efficiently converted intoyThe polarized terahertz wave is output from the output terminal 2. Within the frequency range of 1 THz-3 THzyPolarized terahertz waves are incident from the normal direction withoutxThe polarized terahertz wave is output from the terahertz bidirectional polarization converter, and the output curve thereof is shown in fig. 5.
In addition, whenyThe polarized terahertz-wave is incident from the reverse direction,xthe polarized terahertz wave is output from the terahertz bidirectional polarization converter, the output curve of which is shown in FIG. 6, within two frequency ranges of 1.57THz to 1.85THz and 2.46THz to 2.85THz,ythe polarized terahertz waves incident from the input end 3 can be efficiently converted intoxThe polarized terahertz wave is output from the output terminal 4. Within the frequency range of 1 THz-3 THzxPolarized terahertz waves are incident from the reverse direction withoutyThe polarized terahertz wave is output from the terahertz bidirectional polarization converter, and the output curve thereof is shown in fig. 7.
As can be seen from fig. 4 to 7, when different polarization terahertz waves are incident from different directions, a good polarization conversion effect is achieved after the terahertz waves are subjected to the action of the terahertz bidirectional polarization converter, which indicates that the terahertz wave polarization converter can perform polarization conversion on the different polarization terahertz waves from the positive direction and the negative direction.
Example 2
In this embodiment, if the gap between the top metal notched square ring and the bottom metal notched square ring is a 0 ° rotation angle, the schematic diagram of the three-dimensional array structure and the unit structure obtained by the arrangement is shown in fig. 8. When in usexThe polarized terahertz waves are incident from the positive direction (terahertz wave signals are input from the input end 1), and within the frequency range of 1 THz-3 THz, no terahertz wave is emittedyThe polarized terahertz wave is output from the terahertz bidirectional polarization converter, and the output curve thereof is shown in fig. 9. Similarly, whenyPolarized terahertz waves are incident from the reverse direction (terahertz wave signals are input from the input end 3) atWithin the frequency range of 1 THz-3 THz, noxThe polarized terahertz wave is output from the terahertz bidirectional polarization converter, and the output curve thereof is shown in fig. 10. The embodiment shows that the device cannot realize polarization conversion output of different polarization incident terahertz waves from the positive direction and the negative direction without the structural arrangement designed according to the invention.
Claims (9)
1. A terahertz bidirectional polarization converter is characterized by comprising a terahertz wave incidence end (1), a terahertz wave output end (2), a terahertz wave incidence end (3), a terahertz wave output end (4) and a super-surface polarization converter (5); the super-surface polarization converter (5) is formed by arranging N multiplied by N structural units (6) on a plane vertical to the input direction of the terahertz wave periodically, wherein N is a natural number; the structural unit (6) sequentially comprises a graphene patch (7) and a metal notch square ring (8) on the top layer, a first quartz medium layer (9), a graphene layer (10), a second quartz medium layer (11), a metal notch square ring (12) on the bottom layer and a graphene patch (13) from top to bottom; a 90-degree rotation angle exists between the notch of the top layer metal notch square ring (8) and the notch of the bottom layer metal notch square ring (12).
2. The terahertz bidirectional polarization converter as claimed in claim 1, wherein the graphene patch (7) on the top layer is made of graphene, and has a length and width of 20 μm to 30 μm and a thickness of 0.8nm to 1.2 nm.
3. The terahertz bidirectional polarization converter according to claim 1, wherein the material of the metal notched square ring (8) on the top layer is copper, the length and width are 40 μm to 60 μm, the width of the opening gap is 6 μm to 10 μm, and the thickness is 0.2 μm to 0.5 μm.
4. The terahertz bidirectional polarization converter as claimed in claim 1, wherein the first dielectric layer (9) is made of quartz, has a length and a width of 50-70 μm, and has a thickness of 4-6 μm.
5. The terahertz bidirectional polarization converter as claimed in claim 1, wherein the graphene layer (10) is made of graphene, the length and width of the graphene layer are both 50-70 μm, and the thickness of the graphene layer is 0.8-1.2 nm.
6. The terahertz bidirectional polarization converter as claimed in claim 1, wherein the second dielectric layer (11) is made of quartz, has a length and a width of 50-70 μm, and has a thickness of 4-6 μm.
7. The terahertz bidirectional polarization converter according to claim 1, wherein the material of the bottom metal notched square ring (12) is copper, the length and width are 40 μm to 60 μm, the width of the opening gap is 6 μm to 10 μm, and the thickness is 0.2 μm to 0.5 μm.
8. The terahertz bidirectional polarization converter as claimed in claim 1, wherein the graphene patch (13) at the bottom layer is made of graphene, and has a length and width of 20 μm to 30 μm and a thickness of 0.8nm to 1.2 nm.
9. The terahertz bidirectional polarization converter as claimed in claim 1, wherein a 90 ° rotation angle exists between the notch of the top metal notched square ring (8) and the notch of the bottom metal notched square ring (12).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115101942A (en) * | 2022-06-29 | 2022-09-23 | 四川太赫兹通信有限公司 | Polarization conversion unit and polarization converter |
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