CN103457009B - terahertz low-loss curved waveguide - Google Patents
terahertz low-loss curved waveguide Download PDFInfo
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- CN103457009B CN103457009B CN201310360908.9A CN201310360908A CN103457009B CN 103457009 B CN103457009 B CN 103457009B CN 201310360908 A CN201310360908 A CN 201310360908A CN 103457009 B CN103457009 B CN 103457009B
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Abstract
The present invention relates to a kind of Terahertz low-loss curved waveguide, it comprises outside waveguide plate and inner side waveguide plate, outside waveguide plate and inner side waveguide plate is bending metallic plate and bend is arc-shaped, outside waveguide plate and inner side waveguide plate are arranged in parallel apartly, and the surfaces opposite to each other of side wave guide plate and inner side waveguide plate are outside respectively equipped with periodic grooves.THz wave inputs with transverse magnetic wave pattern one end from outside waveguide plate and inner side waveguide plate, form surface wave after entering the gap between outside waveguide plate and inner side waveguide plate to transmit in the gap, and then be sent to the other end of outside waveguide plate and inner side waveguide plate, thus the bending transmission of the low-loss achieving THz wave.According to technical scheme of the present invention, not only THz wave bending loss is low, and structure is simple, easy to use, with low cost.
Description
Technical field
The present invention relates to a kind of Terahertz low-loss curved waveguide.
Background technology
Terahertz (THz) ripple is the electromagnetic wave between microwave and far infrared.In recent years, along with the development of ultrafast laser technique, that the generation of terahertz pulse is had is stable, excitation source reliably, enables people study Terahertz.Terahertz has a wide range of applications in biomedicine, safety monitoring, nondestructive detecting, astronomy, spectrum and the field such as imaging technique and information science.Terahertz waveguide is a kind of basic transmission apparatus of Terahertz application and is the Primary Component of Terahertz communication system.In the world, the people such as Maier have studied the propagation characteristic (NaturePhotonics of THz wave on nanostructured metal surface in 2008,2,175-179,2008), Nahata equals the pseudo-surface plasma waveguide (OpticsExpress that have studied for 2011 on rectangular recess array, 19,1072-1080,2011), but the transverse electric size of all these structures is comparatively large, causes loss when bending larger.
Summary of the invention
The object of the invention is to overcome the above-mentioned existing waveguide defect that loss is larger when bending.
In order to realize this purpose, the invention provides a kind of Terahertz low-loss curved waveguide, it comprises outside waveguide plate and inner side waveguide plate, outside waveguide plate and inner side waveguide plate is bending metallic plate and bend is arc-shaped, outside waveguide plate and inner side waveguide plate are arranged in parallel apartly, and the surfaces opposite to each other of side wave guide plate and inner side waveguide plate are outside respectively equipped with periodic grooves.
Preferably, the metal material of outside waveguide plate and inner side waveguide plate is the one in aluminium, copper, silver, iron, nickel.
According to a preferred embodiment of the invention, the angle of bend of waveguide is right angle, and bending radius is greater than 500 μm.
According to a preferred embodiment of the invention, wherein outside waveguide plate and inner side waveguide plate shape similar, the groove on the waveguide plate of outside is all identical with gap periods with the size of the groove on the waveguide plate of inner side.
According to a preferred embodiment of the invention, the groove on the groove on the waveguide plate of outside and inner side waveguide plate is symmetrical about the center line between outside waveguide plate and inner side waveguide plate.
According to a preferred embodiment of the invention, the width of groove is 50 ~ 500 μm, and the degree of depth is 50 ~ 500 μm, and length is for being not less than 500 μm; The width of its further groove is preferably 152 μm, and the degree of depth is preferably 274 μm.
According to a preferred embodiment of the invention, the periodic intervals of groove is preferably 475 μm.
According to a preferred embodiment of the invention, the arc radius that the bend two of outside waveguide plate is surperficial is respectively 0.8mm and 1.2mm, and the surperficial arc radius of the bend two of inner side waveguide plate is respectively 0.2mm and 0.6mm.
According to a preferred embodiment of the invention, the spacing between outside waveguide plate and inner side waveguide plate is 0.1 ~ 0.5mm, and medium is air between plate and in groove.
Compared with prior art, according to technical scheme of the present invention, not only reduce THz wave bending loss, and structure is simple, easy to use, with low cost.
Accompanying drawing explanation
Fig. 1 diagrammatically illustrates the structure of Terahertz low-loss curved waveguide according to one preferred embodiment of the present invention with stereogram;
Fig. 2 further schematically show the structure of Terahertz low-loss curved waveguide according to one preferred embodiment of the present invention with end view.
Embodiment
Terahertz low-loss curved waveguide of the present invention is described in detail below in conjunction with accompanying drawing.It will be appreciated by those skilled in the art that embodiment described below is only to exemplary illustration of the present invention, but not for making any restriction to it.
As shown in Figure 1, in according to a preferred embodiment of the invention, Terahertz low-loss curved waveguide comprises two metallic plates i.e. outside waveguide plate 1 and inner side waveguide plate 2, these two metallic plates are all bending metallic plates, bend (corner) is arc-shaped, outside waveguide plate 1 and the parallel placement of inner side waveguide plate 2 and have certain gap between outside waveguide plate 1 and inner side waveguide plate 2, side wave guide plate 1 is provided with periodic grooves with the relative surface of inner side waveguide plate 2 outside, namely the inner surface of side wave guide plate 1 is provided with periodic grooves 11 and is provided with periodic grooves 21 on the outer surface of inner side waveguide plate 2 outside.In addition, be understandable that, the quantity of groove can the transmission length needed for reality be determined, transmission length here refers to the transmission length of terahertz signal in practical application, the length of namely waveguide.
Wherein, the shape of outside waveguide plate 1 and inner side waveguide plate 2 can be similar, and the groove 11 on outside waveguide plate 1 can be all identical with gap periods with the size of the groove 21 on inner side waveguide plate 2.Preferably, groove 11 and groove 21 are about the symmetrically distributions of the center line between outside waveguide plate 1 and inner side waveguide plate 2.
THz wave inputs with transverse magnetic wave pattern one end from outside waveguide plate 1 and inner side waveguide plate 2, form surface wave after entering the gap between outside waveguide plate 1 and inner side waveguide plate 2 to transmit in the gap, and then be sent to the other end of outside waveguide plate 1 and inner side waveguide plate 2, thus realize the low bend loss transmission of THz wave.
It is pointed out that the angle of bend of bending metallic plate (namely outside waveguide plate 1 and inner side waveguide plate 2) can for arbitrarily angled, such as 90 °.
The bending radius of waveguide is preferably greater than 500 μm, and here, the bending radius of waveguide refers to the bending radius of the center line between outside waveguide plate 1 and inner side waveguide plate 2 at sweep.
This Terahertz curved waveguide can change to low-loss the transmission direction of THz wave.In addition, it will be appreciated by persons skilled in the art that the transmission that can be realized the THz wave of different-waveband by adjustment groove size and the distance between plates between outside waveguide plate 1 and inner side waveguide plate 2.
Below, the structure of Terahertz low-loss curved waveguide is according to one preferred embodiment of the present invention further described with reference to Fig. 2.As shown in Figure 2, distance D between outside waveguide plate 1 and inner side waveguide plate 2 is 200 μm, groove 11, 21 depth H are 274 μm, groove 11, 21 width W are 152 μm, groove 11, 21 cycle T occurred are 475 μm, the long L1 of plate is 3mm, the long L2 of plate is 3mm, thickness of slab S is 0.4mm, plate is wide is 2mm, arc radius R1 is 0.2mm, arc radius R2 is 0.6mm, arc radius R3 is 0.8mm, arc radius R4 is 1.2mm, the bending radius of this waveguide is 700 μm, the length of groove is identical with waveguide plate width, outside waveguide plate 1 and inner side waveguide plate 2 angle of bend are 90 °, medium is air between plate and in groove.
Then, exemplary major processing steps (step 1-2 below) and the loss test (step 3-4 below) of Terahertz low-loss curved waveguide are according to one preferred embodiment of the present invention described in the lump.
1) first to size out certain thickness and 90 ° of bending metallic plates two pieces (outside waveguide plate 1 and inner side waveguide plate 2) by the method for machining, then in the respective surfaces of metallic plate, groove 11,21 is processed by mechanical micro-machined method, as shown in Figure 2.
2) by outside waveguide plate 1 and the relatively parallel placement of the reeded face of inner side waveguide plate 2, and make groove 11,21 corresponding further, ensure that two plates are opposing parallel simultaneously.
3) time domain THz wave spectra system (TDS system) is opened, the above-mentioned Terahertz low-loss curved waveguide as shown in Figure 2 made is linked into position suitable in TDS system, makes terahertz signal incident from the slit Terahertz low-loss curved waveguide one end.
4) image data: use the output signal of photoconductive receiver to Terahertz low-loss curved waveguide of TDS system to gather.
Test result shows that the signal transmissivity of this Terahertz low-loss curved waveguide output signal at 0.4THz to 0.6THz is higher than 95%, and this is obviously better than the loss of curved waveguide of the prior art.
Terahertz low-loss curved waveguide structure of the present invention is simple, easy to use, with low cost.
Claims (8)
1. a Terahertz low-loss curved waveguide, it is characterized in that: comprise outside waveguide plate and inner side waveguide plate, described outside waveguide plate and described inner side waveguide plate are bending metallic plate and bend is arc-shaped, described outside waveguide plate and described inner side waveguide plate are arranged in parallel apartly, and the surfaces opposite to each other of described outside waveguide plate and described inner side waveguide plate are respectively equipped with periodic grooves; Wherein:
Groove on groove on the waveguide plate of described outside and described inner side waveguide plate is symmetrical about the center line between described outside waveguide plate and described inner side waveguide plate;
The width of wherein said groove is 50 ~ 500 μm, and the degree of depth is 50 ~ 500 μm, and length is for being not less than 500 μm.
2. Terahertz low-loss curved waveguide according to claim 1, the metal material of wherein said outside waveguide plate and described inner side waveguide plate is the one in aluminium, copper, silver, iron, nickel.
3. Terahertz low-loss curved waveguide according to claim 1, the angle of bend of wherein said waveguide is right angle, and bending radius is greater than 500 μm.
4. Terahertz low-loss curved waveguide according to claim 1, wherein said outside waveguide plate and described inner side waveguide plate shape similar, the groove on the waveguide plate of described outside is all identical with gap periods with the size of the groove on the waveguide plate of described inner side.
5. Terahertz low-loss curved waveguide according to claim 1, the width of wherein said groove is 152 μm, and the degree of depth is 274 μm.
6. Terahertz low-loss curved waveguide according to claim 1, the periodic intervals of wherein said groove is 475 μm.
7. Terahertz low-loss curved waveguide according to claim 1, the arc radius that the bend two of wherein said outside waveguide plate is surperficial is respectively 0.8mm and 1.2mm, and the arc radius that the bend two of described inner side waveguide plate is surperficial is respectively 0.2mm and 0.6mm.
8. the Terahertz low-loss curved waveguide according to any one of claim 1-7, the spacing between wherein said outside waveguide plate and described inner side waveguide plate is 0.1 ~ 0.5mm, and medium is air between plate and in described groove.
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| CN106154416B (en) * | 2016-08-31 | 2021-02-19 | 深圳大学 | Controllable one-way arbitrary turning waveguide of no-leakage low-loss magneto-optical film magnetic surface fast mode |
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| CN104183896B (en) * | 2014-08-11 | 2016-11-09 | 电子科技大学 | It is applicable to four port devices test structures of Terahertz frequency range |
| CN104362419B (en) * | 2014-11-28 | 2017-02-01 | 桂林电子科技大学 | Ultra-wideband (UWB) manual surface plasmonpolariton bend waveguide |
| CN104993194A (en) * | 2015-06-24 | 2015-10-21 | 上海理工大学 | Terahertz wave band elimination filtering device |
| CN105551920B (en) * | 2016-01-19 | 2017-05-17 | 电子科技大学 | Ultra wide band high-power terahertz radiation source |
| CN106249352B (en) * | 2016-08-31 | 2019-04-30 | 欧阳征标 | The low damage type magneto-optic gap fast mould random angle of magnetic surface unidirectionally turns round waveguide |
| CN107069153A (en) * | 2017-04-12 | 2017-08-18 | 北京大学 | One kind is based on surface plasmons waveguide bend mode converter and its implementation |
| CN107065069A (en) * | 2017-05-12 | 2017-08-18 | 深圳市太赫兹科技创新研究院 | Terahertz beam splitter |
| CN110299583B (en) * | 2018-03-22 | 2020-10-09 | 华为技术有限公司 | Mode conversion device and signal transmission system |
| CN110133855A (en) * | 2019-05-08 | 2019-08-16 | 上海理工大学 | THz wave salt free ligands transmission method is guided based on plasma column array |
| CN113346211B (en) * | 2021-06-04 | 2022-07-19 | 北京邮电大学 | Electromagnetic wave transmission waveguide |
| CN116430510B (en) * | 2023-06-14 | 2023-09-05 | 之江实验室 | Optical waveguide and optical waveguide design method |
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| CN101118302A (en) * | 2007-07-30 | 2008-02-06 | 厦门大学 | Long distance surface plasma laser wave-guide facing to integrated optical circuit and manufacturing method therefor |
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