CN103217739A - Three-channel terahertz metal grating waveguide with compound period and application method - Google Patents
Three-channel terahertz metal grating waveguide with compound period and application method Download PDFInfo
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- CN103217739A CN103217739A CN2013101394684A CN201310139468A CN103217739A CN 103217739 A CN103217739 A CN 103217739A CN 2013101394684 A CN2013101394684 A CN 2013101394684A CN 201310139468 A CN201310139468 A CN 201310139468A CN 103217739 A CN103217739 A CN 103217739A
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Abstract
The invention relates to a three-channel terahertz metal grating waveguide with a compound period and an application method. The three-channel terahertz metal grating waveguide comprises a cuboid metal block, wherein tall-and-short metal columns are arranged on the metal block in sequence to form a plurality of tall-and-short metal column pairs, intercolumniations, the widths of the columns, heights of high columns, heights of short columns, and the thicknesses of the columns of the tall-and-short metal column pairs are the same, and the thickness of the metal block at the lower ends of tall-and-short metal column pairs is larger than the thicknesses of the tall-and-short metal columns. The cuboid metal block is placed on a level-and-vertical displacement platform and placed at the appropriate position in a time-domain spectroscopy (TDS) system, when the TDS system is opened, the level-and-vertical displacement platform is adjusted and light pots are adjusted so as to enable the light pots to irradiate to a central position of the metal grating waveguide, and then data of transmitting electromagnetic waves are obtained. The three-channel terahertz metal grating waveguide is simple in structure, under the mode of low-order electromagnetic waves, terahertz waves are coupled into surface plasmon polaritons (SPP) on the surface of the metal grating waveguide, and the physical dimension of the metal grading waveguide is set so that electromagnetic waves are coupled again. A plurality of transmission channels being intensive, symmetrical, equal in gap, and stable are achieved.
Description
Technical field
The present invention relates to a kind of signal transmission device spare grating waveguide, particularly a kind of triple channel Terahertz metal grating waveguide of compounding period.
Background technology
Terahertz (THz) ripple is the electromagnetic wave between microwave and far infrared.In recent years,, make the generation of terahertz pulse that stable, reliable excitation source arranged, from then on make people can study Terahertz along with the development of ultrafast laser technique.Terahertz has a wide range of applications in fields such as biomedicine, safety monitoring, nondestructive detecting, uranology, spectrum and imaging technique and information sciences.And the development and utilization of terahertz wave band be unable to do without the Terahertz function element, and terahertz waveguide is a kind of basic functions device that Terahertz is used, and also is the important devices of Terahertz wireless communication field, and its development enjoys attention always.
2003, German scholar A. Christ (QELS) reported that periodically there is the surface plasmons (SPP) that can conduct in one dimension in the metal surface in the meeting at " quantum electronics and laser science ".Thereby point out to utilize metal grating to make the feasibility of waveguide theoretically.（Soc.?Am.?QELS,?1,?2003）。2011, people such as the Y. G. Ma of Zhejiang University took the lead in preparing based on metal grating shunt and coupling mechanism (Opt. Exp. 19 (22), 21189,2011) by theoretical and experimental technique.2012, the Shen Xiao of Southeast China University roc etc. were realized bendable musical form metal grating waveguide (Proceedings of the National Academy of USA, 110, (1), 40-45,2013) at the GHz wave band.
The waveguide of a plurality of passages is easier to realize wavelength-division multiplex (WDM) compared with the waveguide of having only a passage.Along with the mechanics of communication of Terahertz frequency range more and more is tending towards ripe, can predict in the near future, the communication of terahertz wave band has rapidly and develops.And a plurality of transmission channels are equivalent to open a plurality of communication channels for electromagnetic communication.Because the frequency regulation capability of light source is limited, so several intensive, symmetrical, equally spaced transmission channel can greatly improve the performance of communication system.But, more than the waveguide described in the article that drawn, all only also have a transmission channel, can't produce a plurality of transmission channels, make it in the application in electromagnetic communication field thereby be restricted.
Summary of the invention
The present invention be directed to existing grating waveguide and have only the problem of a passage, a kind of metal grating waveguide of triple channel Terahertz and application method of compounding period have been proposed, it constitutes only needs a kind of metal material, and use the method for machining or etching, just can produce a plurality of transmission channels in the Terahertz scope, thereby realize wavelength-division multiplex.By changing the dimensional parameters of metal grating waveguide, just can customize the transmission channel of particular frequencies in addition, expand the application of metal grating waveguide in the electromagnetic communication field.
Technical scheme of the present invention is: a kind of triple channel Terahertz metal grating waveguide of compounding period, comprise the rectangular parallelepiped derby, the height metal column is arranged in order above the derby, it is right to form several height metal columns, intercolumniation, the post of every pair of height metal column is wide, Gao Zhugao, doll height, post are thick identical, and the height metal column is thick greater than the height metal column to the derby thickness of lower end.
Described height metal column spacing is 10～300 μ m, and the height metal column is wide to be 10～300 μ m, and the height metal column is thick to be 0.1～5 mm, and high post height is 10～500 μ m, and the doll height is 0～500 μ m, less than high post height.
Described height metal column to logarithm at 5-300.
Described rectangular parallelepiped derby material is a kind of in aluminium, copper, silver, iron, nickel, titanium and the alloy thereof.
Described height metal column to job operation is: machining, chemical etching, photoetching and combination in any thereof.
A kind of triple channel Terahertz metal grating waveguide application method of compounding period, comprise the triple channel Terahertz metal grating waveguide of compounding period, the triple channel Terahertz metal grating waveguide of compounding period is placed on horizontal shift platform and the perpendicular displacement platform, high doll is arranged the direction according to light path, and horizontal positioned, the two ends of fixing metal grating waveguide, two displacement platforms are fixed on the experiment porch through specimen holder 4, open terahertz time-domain spectroscopy (TDS) system, experiment porch is put into position suitable in the TDS system, elder generation's adjusting level and vertical displacement platform, regulate facula position, make it to shine the center of metal grating waveguide, obtain the electromagnetic data of transmission.
Beneficial effect of the present invention is: the metal grating waveguide of triple channel Terahertz and the application method of compounding period of the present invention, simple in structure, under the low order mode of electromagnetic wave, THz wave is coupled into surface plasma in the metal grating waveguide surface and swashs (SPP), through the selection of metal grating waveguide geometry size, be coupled into electromagnetic wave again at the end of metal grating waveguide.A plurality of intensive, symmetrical, equidistant, the stable transmission channels of final realization.Expanded the application of metal grating waveguide in the electromagnetic communication field.
Description of drawings
Fig. 1 is the triple channel Terahertz metal grating waveguide front view of compounding period of the present invention;
Fig. 2 is the triple channel Terahertz metal grating waveguide left view of compounding period of the present invention;
Fig. 3 is the Experimental equipment of the triple channel Terahertz metal grating waveguide of compounding period of the present invention;
Fig. 4 is the transmission chromatic dispersion effects figure of the triple channel Terahertz metal grating waveguide example of compounding period of the present invention.
Embodiment
Main the looking and left view of triple channel Terahertz metal grating waveguide as compounding period as described in Fig. 1,2, a rectangular parallelepiped derby, it is right to comprise a plurality of height metal columns above the derby, the height metal column is to being arranged in order, and right intercolumniation, the post of the every pair of height metal column is wide, Gao Zhugao, doll height, post are thick identical.The height metal column is to the derby height of lower end
h: any range, derby thickness
l: any range, but can not less than
D,
Intercolumniation
t: 10～300 μ m, post is wide
w: 10～300 μ m, post is thick
d: 0.1～5 mm, Gao Zhugao
h 1: 10～500 μ m, doll height
h 2: 0～500 μ m but be no more than
h 1The working temperature of device is a room temperature, and atmosphere on every side is dry air.
Physical dimension is respectively in this example: the height metal column is to the derby height of lower end
h: 20 mm, derby thickness
l: 5mm, intercolumniation
t: 60 μ m, post is wide
w: 65 μ m, post is thick
d: 0.5 mm, Gao Zhugao
h 1: 300 μ m, doll height
h 2: 150 μ m, the right number of high doll is 100 simultaneously.
Seek earlier suitable derby blank, metal material is a kind of in aluminium, copper, silver, iron, nickel, titanium and the alloy thereof.Long thick height must not distinguish less than 25 mm 5 mm, 22 mm.Use machining, chemical etching, photoetching and combination in any thereof, go out the as above wave-guide grating structure of size in the surface working of derby.
Several height metal columns of metal grating waveguide to physical dimension complete with and be sequentially arranged in the surface of derby.The right quantity of post is referred to as the periodicity of metal grating waveguide.When periodicity was too small, the periodicity of metal grating waveguide was also less.Because the metal grating waveguide is periodically not obvious, the metal grating waveguide is also less to the selectivity that characteristic frequency SPP propagates, and therefore can't form strong model selection, and the transmission channel quality of formation is also relatively poor.In contrast, when periodicity is excessive, excessive periodicity is that the length of metal grating waveguide is significantly elongated, because SPP is to transmit in the mode of evanescent field at metal and air surface, even its loss of AD HOC that can stable transfer is also very big, thus influence each transmission channel transmissivity.This must consider quality factor and transmissivity simultaneously, chooses suitable periodicity.General periodicity is arranged at 5-300, and in the present embodiment, periodicity is 100.
Fig. 3 is the Experimental equipment of the triple channel Terahertz metal grating waveguide of a kind of compounding period of the present invention.The metal grating waveguide makes high doll arrange the direction according to light path on horizontal shift platform 2 and perpendicular displacement platform 3, and horizontal positioned, the two ends of fixing metal grating waveguide.Two displacement platforms are fixed on the experiment porch through specimen holder 4.
Open terahertz time-domain spectroscopy (TDS) system, position suitable in the TDS system is put in the metal grating waveguide that processes, and first adjusting level and vertical displacement platform are regulated facula position, make it to shine the center of metal grating waveguide.Just can access the electromagnetic data of transmission, can access the transmission dispersion relation (Fig. 4) of the metal grating waveguide of being processed through data processing.
Fig. 4 is the transmission chromatic dispersion effects figure of an example of the present invention.The transmission chromatic dispersion effects figure of preceding 3 rank patterns, as we can see from the figure, the electromagnetic wave of frequency in 0～426.78 GHz can both obtain coupling in the metal grating waveguide surface, but pattern that can stable transfer has only 3 (not considering higher order mode).When transmission reaches stable state (corresponding wave vector for just infinite, form standing wave), the wavelength of 3 pattern correspondences is respectively: 225.3,327.5 and 429.7 GHz prove that this example realizes a plurality of intensive, symmetrical, equally spaced transmission channels.Except that 1 rank mould, other patterns all have lower-frequency limit, and 2 rank moulds and 3 rank moulds are respectively: 182.2 and 334.9 GHz make it can obtain distinguishing check in experiment.
Claims (6)
1. the triple channel Terahertz metal grating waveguide of a compounding period, it is characterized in that, comprise the rectangular parallelepiped derby, the height metal column is arranged in order above the derby, it is right to form several height metal columns, intercolumniation, the post of every pair of height metal column is wide, Gao Zhugao, doll height, post are thick identical, and the height metal column is thick greater than the height metal column to the derby thickness of lower end.
2. according to the triple channel Terahertz metal grating waveguide of the described compounding period of claim 1, it is characterized in that, described height metal column spacing is 10～300 μ m, the height metal column is wide to be 10～300 μ m, the height metal column is thick to be 0.1～5 mm, high post height is 10～500 μ m, and the doll height is 0～500 μ m, less than high post height.
3. according to the triple channel Terahertz metal grating waveguide of the described compounding period of claim 1, it is characterized in that, described height metal column to logarithm at 5-300.
4. according to the triple channel Terahertz metal grating waveguide of the described compounding period of claim 1, it is characterized in that described rectangular parallelepiped derby material is a kind of in aluminium, copper, silver, iron, nickel, titanium and the alloy thereof.
5. according to the triple channel Terahertz metal grating waveguide of the described compounding period of claim 1, it is characterized in that described height metal column to job operation is: machining, chemical etching, photoetching and combination in any thereof.
6. the triple channel Terahertz metal grating waveguide application method of a compounding period, comprise the triple channel Terahertz metal grating waveguide of compounding period, it is characterized in that, the triple channel Terahertz metal grating waveguide of compounding period is placed on horizontal shift platform and the perpendicular displacement platform, high doll is arranged the direction according to light path, and horizontal positioned, the two ends of fixing metal grating waveguide, two displacement platforms are fixed on the experiment porch through specimen holder 4, open terahertz time-domain spectroscopy (TDS) system, experiment porch is put into position suitable in the TDS system, elder generation's adjusting level and vertical displacement platform, regulate facula position, make it to shine the center of metal grating waveguide, obtain the electromagnetic data of transmission.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104241755A (en) * | 2014-03-04 | 2014-12-24 | 上海大学 | Multi-direction wave separator based on surface wave band rejection filters |
| CN104865695A (en) * | 2015-06-01 | 2015-08-26 | 上海理工大学 | THz wave communication frequency switching device based on prism structure and switching method |
| WO2021134750A1 (en) * | 2020-01-02 | 2021-07-08 | 上海理工大学 | Substance fingerprint spectrum sensing device and measuring method |
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| US20050008286A1 (en) * | 2003-06-03 | 2005-01-13 | Ahn Seh Won | Manufacturing method of wavelength filter |
| KR20110041968A (en) * | 2009-10-16 | 2011-04-22 | 서울대학교산학협력단 | Slow surface plasmon polarition waveguid structure using grating couplin |
| CN102288583A (en) * | 2011-07-15 | 2011-12-21 | 中国科学院苏州纳米技术与纳米仿生研究所 | Transmission-type metal grating coupling SPR (Surface Plasmon Resonance) detection chip and detection instrument |
| US20120301914A1 (en) * | 2011-05-26 | 2012-11-29 | John Stephen Peanasky | High Resolution Label-Free Sensor |
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| US20040047538A1 (en) * | 2002-09-11 | 2004-03-11 | International Business Machines Corporation | Optical land grid array interposer |
| US20050008286A1 (en) * | 2003-06-03 | 2005-01-13 | Ahn Seh Won | Manufacturing method of wavelength filter |
| KR20110041968A (en) * | 2009-10-16 | 2011-04-22 | 서울대학교산학협력단 | Slow surface plasmon polarition waveguid structure using grating couplin |
| US20120301914A1 (en) * | 2011-05-26 | 2012-11-29 | John Stephen Peanasky | High Resolution Label-Free Sensor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104241755A (en) * | 2014-03-04 | 2014-12-24 | 上海大学 | Multi-direction wave separator based on surface wave band rejection filters |
| CN104865695A (en) * | 2015-06-01 | 2015-08-26 | 上海理工大学 | THz wave communication frequency switching device based on prism structure and switching method |
| CN104865695B (en) * | 2015-06-01 | 2017-10-13 | 上海理工大学 | THz wave communication frequency switching device and switching method based on prism structure |
| WO2021134750A1 (en) * | 2020-01-02 | 2021-07-08 | 上海理工大学 | Substance fingerprint spectrum sensing device and measuring method |
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