CN117410659A - Terahertz three-band-stop filter based on super-surface structure - Google Patents
Terahertz three-band-stop filter based on super-surface structure Download PDFInfo
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- CN117410659A CN117410659A CN202311548108.XA CN202311548108A CN117410659A CN 117410659 A CN117410659 A CN 117410659A CN 202311548108 A CN202311548108 A CN 202311548108A CN 117410659 A CN117410659 A CN 117410659A
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- 229910052751 metal Inorganic materials 0.000 claims abstract description 59
- 239000002184 metal Substances 0.000 claims abstract description 59
- 238000001914 filtration Methods 0.000 claims abstract description 45
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 4
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052737 gold Inorganic materials 0.000 claims abstract description 4
- 239000010931 gold Substances 0.000 claims abstract description 4
- 229910052709 silver Inorganic materials 0.000 claims abstract description 4
- 239000004332 silver Substances 0.000 claims abstract description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims description 3
- 238000001755 magnetron sputter deposition Methods 0.000 claims description 3
- 230000035699 permeability Effects 0.000 claims description 3
- 239000010410 layer Substances 0.000 abstract description 36
- 230000000694 effects Effects 0.000 abstract description 6
- 239000002356 single layer Substances 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 7
- 230000005684 electric field Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 230000005764 inhibitory process Effects 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000000411 transmission spectrum Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
-
- 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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Abstract
The invention discloses a three-band terahertz band-stop filter based on a super-surface structure, which comprises a tiled filtering unit layer, wherein the filtering unit layer comprises a medium layer and three metal sheet structures with equal distances, wherein the three metal sheet structures are embedded on the upper surface of the medium layer, the widths and the thicknesses of the three metal sheet structures are equal, the metal sheets in the middle of the three metal sheet structures are longest in length, the metal sheets on two sides are different in length, and the metal sheet layers are made of any one of gold, silver or aluminum. Compared with the traditional surface filter for super-realizing single-wave filtering, the invention is three-band filtering, and the size of the super-surface structure or the number of metal sheets can be adjusted to adjust the filtering frequency band and the stop band bandwidth, thereby obtaining the multi-band filtering function. The filter is in a flat spread state under the condition of keeping the filtering effect of a single-layer metal structure, and each metal sheet corresponds to one resonance point, so that the filtering wave band is increased.
Description
Technical Field
The invention relates to the field of terahertz wave band electromagnetic wave filtering characteristics, in particular to a three-band terahertz band-stop filter based on a super-surface structure.
Background
The super surface is an ultra-thin two-dimensional array plane based on generalized Snell's law. The electromagnetic wave filter is composed of metamaterial structural units, and can flexibly and effectively control the characteristics of the electromagnetic wave such as the phase, the polarization mode and the propagation mode, so that the electromagnetic wave filter has wide application prospects in the aspects of controllable intelligent surfaces, novel waveguide structures, electromagnetic wave filtering, small-sized resonance devices and the like.
The filter is mainly divided into four types of high-pass, low-pass, band-stop and band-pass, and the main functions of the filter are to realize frequency selection, frequency division and signal isolation in a communication system. With the rapid development of wireless communication systems, interference between different protocols and different frequency bands is also more and more serious, and the importance of the filter is more and more remarkable. The band reject filter also plays a very important role in a communication system as one of the filters.
In the prior art, most of the band-stop filters based on the super surface work in a narrow filtering frequency band, and once the band-stop filters are far away from a resonant frequency, the filtering effect is rapidly deteriorated, so that the band-stop filters are only suitable for single-frequency filtering and cannot adapt to multi-band filtering. Therefore, a band reject filter with a better filtering effect and multiple bands is needed to be better applied to a complex optical communication system.
Disclosure of Invention
The invention aims to solve the technical problem of providing a three-band terahertz band-stop filter based on a super-surface structure. The bandwidth and the inhibition depth of the stop band are adjusted by changing the resonance structure, and the method has the characteristics of high stop band, high modulation depth and the like.
The object of the invention is achieved in the following way:
the utility model provides a three wave band terahertz band elimination filter based on super surface structure, includes the filtering unit layer of tiling, the filtering unit layer includes the dielectric layer and inlays the sheetmetal structure of establishing three equal distances at dielectric layer upper surface, the width and the thickness of sheetmetal structure are all equal, and sheetmetal length in the middle of the sheetmetal structure is longest, and the sheetmetal length of both sides is different, the material on sheetmetal layer is gold, silver or any one of aluminium.
In the three-band terahertz band-stop filter based on the super-surface structure, the widths of three metal sheets of the metal sheet layer structure are 1um.
The three-band terahertz band-stop filter based on the super-surface structure has the longest metal sheet length of 18um and the metal sheet lengths at the two sides of 8um and 12um respectively; the distance L between the metal sheets at the two sides is 11um.
The thickness of the dielectric layer of the three-band terahertz band-stop filter based on the super-surface structure is 1um; the length of the filtering unit layer is 20um, and the width of the filtering unit layer is 20um.
According to the three-band terahertz band-stop filter based on the super-surface structure, the metal sheet is sputtered on the surface of the dielectric layer through magnetron sputtering and other technologies, and the thickness is larger than 100nm.
In the three-band terahertz band-stop filter based on the super-surface structure, the dielectric layer is made of a material with a relative dielectric constant epsilon=3.4 and a relative magnetic permeability sigma=1.
Compared with the prior art, the invention has the following technical effects:
according to the invention, through simulation of a filter structure of a terahertz wave band and simulation of filtering characteristics, parameter curves of filtering characteristics at 5.6THZ, 8.28THZ and 12.04THZ under vertical irradiation of an electric field mode (TE) are obtained. The band-stop filter comprises a filtering unit layer, the band-stop bandwidth and the inhibition depth can be adjusted by changing the resonance structure, and the band-stop filter has the characteristics of high band-stop and high modulation depth.
Compared with the traditional surface filter for super-realizing single-wave filtering, the invention is three-band filtering, and the size of the super-surface structure or the number of metal sheets can be adjusted to adjust the filtering frequency band and the stop band bandwidth, thereby obtaining the multi-band filtering function. The filter is in a flat spread state under the condition of keeping the filtering effect of a single-layer metal structure, and each metal sheet corresponds to one resonance point, so that the filtering wave band is increased. At the time of vertical emission of the electric field mode (TE), blue shift of the wavelength can be achieved by adjusting the dielectric layer thickness.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a graph of resonance of a filter cell layer of the present invention;
FIG. 3 is a graph of the resonance curve of the longest sheet metal of the present invention changing its length;
FIG. 4 is a graph of resonance curves of the present invention for varying the thickness of the mass transfer layer;
FIG. 5 is a graph of the resonance curve of the shortest sheet metal of the present invention changing its length;
FIG. 6 is a graph of resonance curve of the longest sheet metal of the present invention changing its width;
fig. 7 is a graph of resonance curve of the middle length sheet metal of the present invention changing its width.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The construction and operation of the present invention will be described in detail with reference to fig. 1-7.
As shown in fig. 1, a three-band terahertz band-stop filter based on a super-surface structure comprises a tiled filtering unit layer, wherein the filtering unit layer comprises a dielectric layer and three metal sheet structures with equal distances embedded on the upper surface of the dielectric layer, the widths and the thicknesses of the three metal sheet structures are equal, the lengths of metal sheets in the middle of the three metal sheet structures are longest, the lengths of the metal sheets on two sides are different, and the metal sheet layers are made of any one of gold, silver or aluminum.
The three-band terahertz band-stop filter based on the super-surface structure has the advantages that the widths of three metal sheets of the metal sheet layer structure are 1um.
The three-band terahertz band-stop filter based on the super-surface structure has the longest metal sheet length of 18um and the metal sheet lengths at the two sides of 8um and 12um respectively; the distance L between the metal sheets at the two sides is 11um.
The thickness of the dielectric layer of the three-band terahertz band-stop filter based on the super-surface structure is 1um; the length of the filtering unit layer is 20um, and the width of the filtering unit layer is 20um.
According to the three-band terahertz band-stop filter based on the super-surface structure, the metal sheet is sputtered on the surface of the dielectric layer by magnetron sputtering and other technologies, and the thickness is larger than 100nm.
According to the three-band terahertz band-stop filter based on the super-surface structure, the dielectric layer is made of the material with the relative dielectric constant epsilon=3.4 and the relative magnetic permeability sigma=1.
In the transmission curve of the terahertz band-stop filter based on the super-surface structure shown in fig. 2, when the incident electromagnetic wave is perpendicular to the structure incident unit resonance structure along the reverse direction of Z in the embodiment, the three-band transmission curve shown in fig. 2 is obtained, and the resonance frequency points occur at 5.6THZ, 8.28THZ and 12.04 THZ.
Fig. 3 shows that the longest sheet of metasurface structure, changing its length, will appear as a red-blue shift at the first resonance point curve, with transmission curves at 7.04THZ and 5.6THZ, respectively, when stepping to 18um at 14 um. It is clear from the figure that a light red shift occurs by varying the thickness of the longest sheet metal.
FIG. 4 shows the dielectric layer of the super-surface structure, and changing the thickness of the dielectric layer changes the red-blue shift of three resonance points. When 0.375um is stepped to 1.5um, a red-blue shift in the transmission spectrum is clearly observed, with the first and second transmission valleys ranging from 7.88 to 9.24 light-weight blue shifts. In addition, the super surface structure can be found to be more sensitive to thickness variations of the dielectric layer.
Fig. 5 shows the transmission characteristics of the super-surface structure when the widths of the rectangular metal sheets are changed, the lengths of the metal sheets are 8um from left to right, and the second trough is obviously red-shifted by changing the widths. The red shift was close to 0.1THZ when the 0.5um was stepped to 2um, and the second peak was also red shifted by about 0.3THZ, knowing that changing its width could change the red-blue shift of the second trough and second peak.
Fig. 6 shows the transmission characteristics of the super-surface structure when the widths of the rectangular metal sheets are changed by 18um in the middle length from left to right, and the two peaks are obviously observed to have obvious red-blue shift by changing the widths, wherein the red-shift frequency of the first peak is close to 0.3THZ when the first peak is stepped to 2um, and the red-shift frequency of the second peak is close to 0.2THZ. The invention can be used as a three-band-stop device under an electric field mode (TE).
Fig. 7 shows that the super-surface structure changes the transmission characteristics of the rectangular metal sheet when the widths of the metal sheets are changed from the right side to the left side, namely, the rightmost 12um long metal sheet, and the change of the widths obviously observes that the first wave crest and the third wave trough have red-blue shift, so that the influence of the rectangular metal sheet width on the band stop is known. When the wave is stepped to 2um from 0.5um, the first wave crest is red-shifted by approximately 0.25THZ, the third wave trough is red-shifted by approximately 0.4THZ, the frequency bands of the wave crest and the wave trough are increased, the resonance point is changed along with the width parameter of the rectangular metal sheet, and the change of the width can change the red-blue shift of the wave trough and the wave crest. The invention can be used as a three-band-stop under an electric field mode (TE).
According to the invention, through simulation of a filter structure of a terahertz wave band and simulation of filtering characteristics, parameter curves of filtering characteristics at 5.6THZ, 8.28THZ and 12.04THZ under vertical irradiation of an electric field mode (TE) are obtained. The band-stop filter comprises a filtering unit layer, the band-stop bandwidth and the inhibition depth can be adjusted by changing the resonance structure, and the band-stop filter has the characteristics of high band-stop and high modulation depth.
Compared with the traditional surface filter for super-realizing single-wave filtering, the invention is three-band filtering, and the size of the super-surface structure or the number of metal sheets can be adjusted to adjust the filtering frequency band and the stop band bandwidth, thereby obtaining the multi-band filtering function. The filter is in a flat spread state under the condition of keeping the filtering effect of a single-layer metal structure, and each metal sheet corresponds to one resonance point, so that the filtering wave band is increased. At the time of vertical emission of the electric field mode (TE), blue shift of the wavelength can be achieved by adjusting the dielectric layer thickness.
It will be apparent that the described embodiments are some, but not all, of the embodiments of the invention. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
Thus, the following detailed description of the embodiments of the invention, which are presented in the drawings, are not intended to limit the scope of the invention as claimed, but are merely representative of selected embodiments of the invention, based on which all other embodiments that a person of ordinary skill in the art would achieve without inventive effort are within the scope of the invention.
Claims (6)
1. Three-band terahertz band-stop filter based on super surface structure, including the filtering unit layer of tiling, its characterized in that: the filtering unit layer comprises a medium layer and three metal sheet structures with equal distances embedded on the upper surface of the medium layer, the widths and the thicknesses of the three metal sheet structures are equal, the lengths of metal sheets in the middle of the three metal sheet structures are longest, the lengths of metal sheets on two sides are different, and the metal sheet layers are made of any one of gold, silver or aluminum.
2. The three-band terahertz band-stop filter based on a super-surface structure of claim 1, wherein: the three metal sheets of the metal sheet layered structure have a width of 1um.
3. The three-band terahertz band-stop filter based on a super-surface structure according to claim 2, wherein: the length of the longest metal sheet is 18um, and the lengths of the metal sheets at the two sides are 8um and 12um respectively; the distance L between the metal sheets at the two sides is 11um.
4. The three-band terahertz band-stop filter based on a super surface structure according to claim 3, wherein: the thickness of the dielectric layer is 1um; the length of the filtering unit layer is 20um, and the width of the filtering unit layer is 20um.
5. The three-band terahertz band-stop filter based on a super-surface structure of claim 1, wherein: the metal sheet is sputtered onto the surface of the dielectric layer by a magnetron sputtering technology.
6. The three-band terahertz band-stop filter based on a super-surface structure of claim 1, wherein: the dielectric layer is made of a material with a relative permittivity epsilon=3.4 and a relative permeability sigma=1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311548108.XA CN117410659A (en) | 2023-11-20 | 2023-11-20 | Terahertz three-band-stop filter based on super-surface structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311548108.XA CN117410659A (en) | 2023-11-20 | 2023-11-20 | Terahertz three-band-stop filter based on super-surface structure |
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| Publication Number | Publication Date |
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| CN117410659A true CN117410659A (en) | 2024-01-16 |
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| CN202311548108.XA Pending CN117410659A (en) | 2023-11-20 | 2023-11-20 | Terahertz three-band-stop filter based on super-surface structure |
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| CN (1) | CN117410659A (en) |
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- 2023-11-20 CN CN202311548108.XA patent/CN117410659A/en active Pending
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