CN109888506B - Frequency-adjustable terahertz multi-band absorber - Google Patents
Frequency-adjustable terahertz multi-band absorber Download PDFInfo
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- CN109888506B CN109888506B CN201910007698.2A CN201910007698A CN109888506B CN 109888506 B CN109888506 B CN 109888506B CN 201910007698 A CN201910007698 A CN 201910007698A CN 109888506 B CN109888506 B CN 109888506B
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Abstract
The invention discloses a frequency-adjustable terahertz multi-band absorber which comprises an absorber body fixed on a rotatable platform, wherein a plurality of absorbing units are distributed on the absorbing surface of the absorber body, each absorbing unit comprises a three-layer structure of a metal pattern layer, a loss dielectric layer and a bottom total reflection layer which are tightly attached from top to bottom, the metal pattern layer comprises four pairs of H-shaped metal pattern symmetrical structures which are symmetrical by the surface center of the absorbing unit, each pair of H-shaped metal pattern symmetrical structures comprises two H-shaped metal structures, and the four pairs of H-shaped metal pattern symmetrical structures are sequentially and uniformly arranged in a clockwise direction.
Description
Technical Field
The invention belongs to the technical field of terahertz metamaterials, and particularly relates to a frequency-adjustable terahertz multi-band absorber.
Background
Terahertz waves refer to electromagnetic waves with the frequency between 0.1THz and 10THz, and the frequency band is between far infrared and microwave in an electromagnetic spectrum, namely in the transition stage from electronics to photonics. In nature, a material generating good electromagnetic response to the band is relatively lacked, so that design and implementation of devices such as light regulation, sensing and absorption of the terahertz band are hindered, and development of the terahertz wave technology is further limited. In addition, the terahertz ray has a plurality of advantages: the photon carrying energy is low, and the substance to be detected is not easy to damage; the penetrability is strong, most nonpolar substances are transparent to the terahertz waveband, and the terahertz waveband monitoring system can be well applied to the field of safety monitoring; the damage to the living things is extremely low, and the method can be well applied to the fields of medical imaging, biological monitoring and the like. Because of its high application value, how to control terahertz waves, that is, how to search for materials with good response in the terahertz wave band, becomes an important direction of research.
The metamaterial with the artificial periodic structure provides a brand new method for realizing electromagnetic wave regulation, and different from the traditional material, the metamaterial has miraculous characteristics such as negative dielectric constant, negative magnetic permeability and negative refractive index which are not possessed by the conventional material. Through artificial design, the metamaterial can realize the characteristic of specific frequency response, has unprecedented prospects in the terahertz field, and is widely concerned by people. The emergence of electromagnetic metamaterials opens the door for exploring terahertz wave bands, and particularly, the metamaterials can absorb electromagnetic waves with specific frequencies and frequency bands through strict design of unit structures and proper period control. At present, most of devices applied to terahertz wave bands still have the characteristics of large volume, thickness, inconvenience for integration and the like, and the lack of miniaturized devices hinders practical application. With the continuous research on terahertz metamaterial absorbers, absorbers with different structures and different characteristics are proposed. However, the general metamaterial can only show response to electromagnetic waves with specific frequency after being designed and processed, which undoubtedly limits the practical application capability of the metamaterial.
Disclosure of Invention
The invention aims to provide a frequency-adjustable terahertz multi-band absorber, which solves the problem that the terahertz metamaterial absorber in the prior art only can respond to electromagnetic waves with specific frequency, so that the practical application capability is limited.
The technical scheme adopted by the invention is that the frequency-adjustable terahertz multi-band absorber is characterized by comprising an absorber body fixed on a rotatable platform, wherein a plurality of absorption units are distributed on the absorption surface of the absorber body, and each absorption unit comprises a three-layer structure of a metal pattern layer, a loss dielectric layer and a bottom total reflection layer which are tightly attached from top to bottom.
The present invention is also characterized in that,
the metal pattern layer comprises four pairs of H-shaped metal pattern symmetrical structures which are symmetrical by the surface center of the absorption unit, each pair of H-shaped metal pattern symmetrical structures comprises two H-shaped metal structures, the four pairs of H-shaped metal pattern symmetrical structures are sequentially and uniformly arranged in a clockwise direction and are sequentially respectively an H-shaped metal structure A, H-shaped metal structure B, H-shaped metal structure C, H-shaped metal structure D, wherein the H-shaped metal structures A are located at 12 points and 6 points, and the H-shaped metal structures D are located at 4:30 positions and 10:30 positions.
H-shaped metal structure A, H-shaped metal structure B, H-shaped metal structure C, H-shaped metal structure D has different geometric parameters, wherein the length of the short side of the H-shaped metal structure A perpendicular to the axial direction is 20 μm, the length of the short side of the H-shaped metal structure B perpendicular to the axial direction is 12 μm, the length of the short side of the H-shaped metal structure C perpendicular to the axial direction is 16 μm, and the length of the short side of the H-shaped metal structure D perpendicular to the axial direction is 8 μm.
H-shaped metal structure A, H-shaped metal structure B, H-shaped metal structure C, H-shaped metal structure D is at the same distance from the center of the cell, and the distance D is 50 μm.
H-shaped metal structure A, H-shaped metal structure B, H-shaped metal structure C, H-shaped metal structure D have a distance between adjacent ones that is less than their own line width.
The rotatable platform rotates at 45 ° intervals.
The loss dielectric layer is made of polyimide with a dielectric constant of 3.5, a loss tangent of 0.0027 and a thickness of 8 μm.
The lattice constant P for the absorber unit is 150 μm.
The frequency-adjustable terahertz multi-band absorber has the beneficial effects that the metal structures of all parts have different geometric parameters, and the anisotropy in the distribution direction of each pair of metal patterns is realized. The whole structure of the absorber is fixed on a rotatable platform, so that the absorber can rotate about the polarization direction of incident waves, and the tunable characteristic of the absorption frequency and the absorption amplitude of the absorber is realized by rotating to a fixed angle.
Drawings
FIG. 1 is a schematic structural diagram of an absorption unit in a frequency tunable terahertz multiband absorber according to the present invention;
FIG. 2 is a top view of an absorption unit in a frequency tunable terahertz multiband absorber according to the invention;
FIG. 3 is a working principle block diagram of a frequency tunable terahertz multi-band absorber according to the present invention;
FIG. 4 is a schematic diagram of absorption characteristics of a frequency tunable terahertz multi-band absorber according to the present invention at different rotation angles;
FIG. 5 is a schematic diagram of the overall structure of a frequency tunable terahertz multiband absorber according to the present invention;
fig. 6 is a photomicrograph of a cell in a frequency tunable terahertz multiband absorber of the invention.
In the figure, 1, a bottom total reflection layer, 2, a loss dielectric layer, 3, a metal pattern layer, 4, an H-shaped metal structure A, 5, an H-shaped metal structure B, 6, an H-shaped metal structure C and 7, an H-shaped metal structure D.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention discloses a frequency-adjustable terahertz multi-band absorber which is structurally shown in fig. 5 and comprises an absorber body fixed on a rotatable platform, wherein a plurality of absorption units are distributed on the absorption surface of the absorber body, and each absorption unit comprises a three-layer structure of a metal pattern layer 3, a loss dielectric layer 2 and a bottom total reflection layer 1 which are tightly attached from top to bottom as shown in fig. 1 and 2.
The metal pattern layer 3 comprises four pairs of H-shaped metal pattern symmetrical structures which are symmetrical by the surface center of the absorption unit, each pair of H-shaped metal pattern symmetrical structures comprises two H-shaped metal structures, the line widths of the H-shaped metal structures are 4 micrometers, the four pairs of H-shaped metal pattern symmetrical structures are sequentially and uniformly arranged in the clockwise direction and are respectively an H-shaped metal structure A4, an H-shaped metal structure B5, an H-shaped metal structure C6 and an H-shaped metal structure D7, wherein the H-shaped metal structure A4 is located at 12 points and 6 points, and the H-shaped metal structure D7 is located at positions of 4:30 and 10: 30.
H-shaped metal structure A4, H-shaped metal structure B5, H-shaped metal structure C6 and H-shaped metal structure D7 have different geometrical parameters, wherein the length of the short side of H-shaped metal structure A4 perpendicular to the axial direction is 20 micrometers, the length of the short side of H-shaped metal structure B5 perpendicular to the axial direction is 12 micrometers, the length of the short side of H-shaped metal structure C6 perpendicular to the axial direction is 16 micrometers, and the length of the short side of H-shaped metal structure D7 perpendicular to the axial direction is 8 micrometers.
H-shaped metal structure a4, H-shaped metal structure B5, H-shaped metal structure C6, and H-shaped metal structure D7 were the same distance from the center of the cell, and D was 50 μm.
The distances between the H-shaped metal structures A4, B5, C6 and D7 are smaller than the line widths of the H-shaped metal structures A4, B5, C6 and D7.
The rotatable platform rotates at 45 ° intervals.
The loss dielectric layer 2 is made of polyimide with a dielectric constant of 3.5, a loss tangent of 0.0027 and a thickness of 8 μm.
The lattice constant P for the absorber unit is 150 μm.
The invention relates to a frequency-adjustable terahertz multi-band absorber, and figure 3 is a working principle block diagram of the frequency-adjustable terahertz multi-band absorber, which utilizes the characteristic that H-shaped metal structures with different geometric parameters generate different characteristic responses after electromagnetic waves are incident to realize the anisotropy of a unit relative to the polarization direction of the incident electromagnetic waves; the metal structures with different geometric parameters respond to the incident electromagnetic wave, and the main peak positions of the metal structures are different. FIG. 5 is a schematic diagram of the overall structure of the present invention, wherein the absorber body is fixed on the surface of the platform, and the bottom of the platform is provided with a rotatable structure; the absorber structure is fixed on a rotatable platform, and the H-shaped metal structures with different geometric parameters generate response by rotating the platform by a specific angle, so that the tunability of the absorption frequency point is realized. Fig. 4 is a schematic diagram of absorption characteristics of the present invention at different rotation angles, and it can be seen from the diagram that when the absorber rotates by 0 °, 45 °, 90 °, and 135 °, absorption characteristic curves are different due to anisotropy of the unit structure, absorption frequencies of main peaks at different angles are different, and absorption rates all reach more than 90%, so that it can be seen that the present invention can realize tunable characteristics of absorption frequencies of the absorber through rotation, and has characteristics of high absorption rate, multiple absorption frequency points, etc.; fig. 6 is a photomicrograph of a rotationally tunable terahertz multiband absorber unit.
The frequency-adjustable terahertz multi-band absorber has a single-layer metal pattern, and is simple in structure and convenient to process; the absorption frequency is adjustable, and the absorption rate is high; the tunable main peak has an absorptivity of over 99.9 percent and has a plurality of absorption frequency points; the H-shaped metal structures with different lengths are distributed in a crossed manner in the clockwise direction and are not arranged according to the length sequence, so that the asymmetry of the metal patterns is reduced, and the deviation of the absorption characteristics is reduced; the tuning means is more convenient and simpler than the existing scheme: the metal pattern layer is composed of four parts of H-shaped metal structures with different geometric parameters, the metal structures with different geometric parameters can provide different absorption frequencies, the distances from all the metal structures to the center of the unit are the same, and the change of the absorption frequencies can be realized through rotation, so that the tunability of the absorption characteristics is realized; the unit has obvious anisotropy and a certain polarization conversion function, and the polarization conversion characteristic is changed along with the rotation tuning of the platform.
Claims (4)
1. A frequency-adjustable terahertz multi-band absorber is characterized by comprising an absorber body fixed on a rotatable platform, wherein a plurality of absorbing units are distributed on the absorbing surface of the absorber body, each absorbing unit comprises three layers of structures, namely a metal pattern layer (3), a loss dielectric layer (2) and a bottom total reflection layer (1), which are tightly attached from top to bottom, the metal pattern layer (3) comprises four pairs of H-shaped metal pattern symmetrical structures which are symmetrical by the surface centers of the absorbing units, each pair of H-shaped metal pattern symmetrical structures respectively comprises two H-shaped metal structures, the four pairs of H-shaped metal pattern symmetrical structures are sequentially and uniformly arranged in a clockwise direction and are respectively an H-shaped metal structure A (4), an H-shaped metal structure B (5), an H-shaped metal structure C (6) and an H-shaped metal structure D (7), wherein the H-shaped metal structure A (4) is positioned at the 12 o 'clock and the 6 o' clock positions, the H-shaped metal structure D (7) is positioned at the positions of 4:30 of the hour hand and 10:30 of the hour hand, the H-shaped metal structure A (4), the H-shaped metal structure B (5), the H-shaped metal structure C (6) and the H-shaped metal structure D (7) have different geometric parameters, wherein the length of the short side of the H-shaped metal structure A (4) perpendicular to the axial direction is 20 micrometers, the length of the short side of the H-shaped metal structure B (5) perpendicular to the axial direction is 12 micrometers, the length of the short side of the H-shaped metal structure C (6) perpendicular to the axial direction is 16 micrometers, the length of the short side of the H-shaped metal structure D (7) perpendicular to the axial direction is 8 micrometers, the distances from the H-shaped metal structure A (4), the H-shaped metal structure B (5), the H-shaped metal structure C (6) and the H-shaped metal structure D (7) to the center of the unit are the same, the distance D is 50 micrometers, the distances between the H-shaped metal structures B (5), C (6) and D (7) are smaller than the line widths of the H-shaped metal structures, and the line widths of the H-shaped metal structures are all 4 micrometers.
2. The frequency tunable terahertz multiband absorber of claim 1, wherein the rotatable platform rotates at 45 ° intervals.
3. The frequency tunable terahertz multiband absorber according to claim 1, wherein the loss dielectric layer (2) is made of polyimide with a dielectric constant of 3.5, a loss tangent of 0.0027 and a thickness of 8 μm.
4. The frequency tunable terahertz multiband absorber according to claim 3, wherein the absorption unit has a corresponding lattice constant P of 150 μm.
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| CN102931495A (en) * | 2012-10-31 | 2013-02-13 | 电子科技大学 | Single-frequency/dual-frequency electromagnetic ultra-medium wave absorbing material |
| CN105097052A (en) * | 2014-05-22 | 2015-11-25 | 西北工业大学 | Surface resistive type broadband meta-material absorber |
| CN105870638A (en) * | 2016-03-31 | 2016-08-17 | 北京环境特性研究所 | Fractal-element-based frequency selective surface structure and window absorber |
| CN108919523A (en) * | 2018-09-03 | 2018-11-30 | 北京航空航天大学 | The THz wave transmitter that polarization state is tunable |
| US10170831B2 (en) * | 2015-08-25 | 2019-01-01 | Elwha Llc | Systems, methods and devices for mechanically producing patterns of electromagnetic energy |
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Patent Citations (5)
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| CN102931495A (en) * | 2012-10-31 | 2013-02-13 | 电子科技大学 | Single-frequency/dual-frequency electromagnetic ultra-medium wave absorbing material |
| CN105097052A (en) * | 2014-05-22 | 2015-11-25 | 西北工业大学 | Surface resistive type broadband meta-material absorber |
| US10170831B2 (en) * | 2015-08-25 | 2019-01-01 | Elwha Llc | Systems, methods and devices for mechanically producing patterns of electromagnetic energy |
| CN105870638A (en) * | 2016-03-31 | 2016-08-17 | 北京环境特性研究所 | Fractal-element-based frequency selective surface structure and window absorber |
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Application publication date: 20190614 Assignee: Wang Yue Assignor: XI'AN University OF TECHNOLOGY Contract record no.: X2022980005923 Denomination of invention: A frequency adjustable terahertz multi band absorber Granted publication date: 20201222 License type: Exclusive License Record date: 20220519 |
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Inventor after: Cui Zijian Inventor after: Wang Yue Inventor after: Zhu Dongying Inventor after: Yue Lisha Inventor before: Wang Yue Inventor before: Cui Zijian Inventor before: Zhu Dongying Inventor before: Yue Lisha |
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