CN105207042A - THz wave radiation source with oval groove grating structure - Google Patents
THz wave radiation source with oval groove grating structure Download PDFInfo
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- CN105207042A CN105207042A CN201510621672.9A CN201510621672A CN105207042A CN 105207042 A CN105207042 A CN 105207042A CN 201510621672 A CN201510621672 A CN 201510621672A CN 105207042 A CN105207042 A CN 105207042A
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Abstract
The invention provides a THz wave radiation source with an oval groove grating structure. The oval groove grating with periodicity is adopted as a beam-wave interaction structure of the radiation source. When an electron beam passes through the structure at a certain speed, the electron beam and surface slow waves interact to be clustered and generate an electron beam cluster, then Smith-Purcell coherent radiation is stimulated, radiation is collected through a flat plate or a curved mirror (metal or medium) to generate tunable, compact and high-power THz waves, and therefore the THz wave radiation source can be easily applied to communication, radars, electronic countermeasures, electromagnetic weapons, astronomy, medical imaging, nondestructive detection, safety inspection and other aspects.
Description
Technical field
The present invention relates to vacuum electronics Terahertz Technology field, particularly relate to a kind of oval groove optical grating construction Smith-Purcell effect THz wave radiation source.
Background technology
Terahertz (Terahertz is called for short THz) ripple is a kind of electromagnetic radiation between far infrared light wave and microwave and millimeter wave, its frequency (1THz=10 from 100GHz to 10THz
12hz), corresponding wavelength is from 3 millimeters to 30 microns, THz ripple occupies very special position in electromagnetic spectrum, and its special performance brings profound influence to the fields such as communication, radar, electronic countermeasures, ELECTROMAGNETIC WEAPON, astronomy, medical imaging, Non-Destructive Testing, safety inspection.Nowadays THz technology has been used to, in the researchs such as material, life science, communication, agricultural and national security, define multiple research field interdisciplinary.But, a problem demanding prompt solution: how to obtain a high power, compact adjustable room temperature THz wave radiation source? because be no matter the angle from electricity or optics, all there is a limit in common opto-electronic device: electronic device is difficult to higher than this THz frequency, and optics is difficult to lower than this THz frequency near THz frequency.Therefore seek effective ways, exploring new mechanism, to develop high performance THz wave radiation source be very necessary, and to the application of promotion THz ripple in military and civilian two, there is important strategic importance.
The method that can be used as THz emission source at present has multiple, mainly comprises following a few class: semiconductor THz wave radiation source (as THz-QCL etc.); Based on the THz generator of photonic propulsion; Utilize the THz wave radiation source (comprising THz vacuum device, electronic cyclotron maser and free-electron laser) of free electron; Based on the THz radiation source etc. of high energy acclerator.THz-QCL radiation source becomes the barrier of its extensive use due to the restriction being subject to extremely low temperature, the power exported based on the THz source of photonic propulsion is lower, and based on the THz radiation source of high energy acclerator owing to needing huge accelerator, the application that its extensive use is included in military field is also greatly limited.In THz radiation source, the coherent radiation phenomenon based on Smith-Purcell (SP) effect causes the extensive research interest of scientists and showing great attention to of government, is one of research field relatively enlivened in the world at present.Its principle is that when utilizing electron beam to press close to grating upper surface motion, produce the radiation of millimeter wave far infrared band, the frequency of radiation changes with the change of viewing angle, is called SP effect.When continuous electronic note with the mutual effect of grating surface slow wave and clustering time, SP radiation just becomes stronger coherent radiation.Representative device based on this coherent radiation has SP effect free electron laser (free-electronlasers is called for short FELs).Relatively traditional FELs, SP-FELs have the advantages such as compact, adjustable, high-power, and therefore it becomes a hot research field of vacuum electronics THz radiation source.
1998, the people such as Urata utilize the optical grating construction that the continuous electronic note drive cycle of 30-50keV is 0.17mm, make electron beam clustering by Beam and wave interaction, observed the superradiance phenomenon of SP effect in an experiment, the SPFELs of Development of Novel is had great importance.In experiment, optical grating construction adopts rectangular channel metal grating, and this structure dispersion is very strong and when being operated in backward wave state, needs larger electric current ability starting of oscillation.2005, the electron beam of the clustering in advance group that MIT group utilizes linear accelerator produce power to be 15MeV, carried out with this grating that drive cycle is 1cm, 90 ° of directions observed THz ripple.Adopt notch cuttype grating as Beam and wave interaction structure in experiment, advantage improves efficiency, but the electron beam group producing clustering in advance needs huge accelerator, limits its extensive use.
Summary of the invention
(1) technical problem that will solve
In view of above-mentioned technical problem, the invention provides a kind of oval groove optical grating construction Smith-Purcell effect THz ripple coherent source.
(2) technical scheme
According to an aspect of the present invention, provide one and there is oval groove optical grating construction terahertz radiation source, it is characterized in that, comprising:
Gun cathode, this negative electrode is for launching the electron beam of certain speed;
Electron beam collector, be arranged at described gun cathode just to position, form Beam and wave interaction district between described gun cathode and described electron beam collector;
Oval groove optical grating construction, it is arranged in described Beam and wave interaction district;
Electron beam channel, the exit direction along electron beam is arranged at the centre position of described oval groove optical grating construction upper surface, vertical with described oval groove, and parallel with the electron beam that described gun cathode is launched;
Flat board, is arranged at position directly over described oval groove optical grating construction, with the opening parallel of described oval groove;
Wherein, the electron beam that described gun cathode is launched is through described electron beam channel, interact with described oval groove optical grating construction and produce clustering electron beam group, and then the THz wave produced based on relevant Smith-Purcell effect, described THz wave is carried out energy by described flat board and is collected, realize power amplification and growth rate raising, and collected by described electron beam collector through the electron beam of interacting formations.
(3) beneficial effect
As can be seen from technique scheme, oval groove optical grating construction Smith-Purcell effect THz wave radiation source of the present invention has following beneficial effect:
(1) adopt periodicity oval groove grating as Beam and wave interaction structure, both the dispersion having reduced structure again reduces starting oscillation current during backward wave work simultaneously, be conducive to the generation of electron beam clustering and coherent radiation, thus be conducive to the extensive use in THz wave radiation source;
(2) by electron beam channel is partially submerged in optical grating construction, reduce the distance of electron beam to grating, enhance Beam and wave interaction, improve THz wave radiation intensity simultaneously, be conducive to realizing the high power of radiation source, miniaturization, densification, reduce the development cost of device;
(3) by the flat board (metallic plate or dielectric-slab) be positioned at directly over grating, the energy being radiated open space is collected, be conducive to the collection and the output that realize radiation.
Accompanying drawing explanation
Fig. 1 is the too hereby wave radiation source three-dimensional structure schematic diagram in the present invention with oval groove optical grating construction;
Fig. 2 is the too hereby wave radiation source overall structure schematic diagram in the present invention with oval groove optical grating construction;
Fig. 3 is electron beam channel schematic cross-section in the present invention.
[main element symbol description of the present invention]
1-gun cathode; 2-electron beam;
3-electron beam collector; 4-oval groove optical grating construction;
5-flat board (metallic plate or dielectric-slab); 6-electron beam channel.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
It should be noted that, in accompanying drawing or specification describe, similar or identical part all uses identical figure number.The implementation not illustrating in accompanying drawing or describe is form known to a person of ordinary skill in the art in art.In addition, although herein can providing package containing the demonstration of the parameter of particular value, should be appreciated that, parameter without the need to definitely equaling corresponding value, but can be similar to corresponding value in acceptable error margin or design constraint.In addition, the direction term mentioned in following examples, such as " on ", D score, "front", "rear", "left", "right" etc., be only the direction with reference to accompanying drawing.Therefore, the direction term of use is used to illustrate and is not used for limiting the present invention.
The invention provides a kind of oval groove optical grating construction Smith-Purcell effect THz wave radiation source.This THz wave radiation source adopts periodically oval groove optical grating construction, electron beam channel is partially submerged in grating, electron beam passes through electron beam channel, to interact the SP radiation producing and be positioned at THz frequency range with the surperficial slow wave of grating, and by dull and stereotyped (metal or medium), the energy being radiated open space is collected, realize exporting by coupled structure at optical grating construction end.This structure reduces dispersion and achieves frequency-adjustable and energy collects.
In one exemplary embodiment of the present invention, provide a kind of oval groove optical grating construction Smith-Purcell effect THz wave radiation source.Fig. 1 is the structural representation according to embodiment of the present invention THz wave radiation source.Please refer to Fig. 1, the present embodiment oval groove optical grating construction Smith-Purcell effect THz wave radiation source comprises: gun cathode 1, electron beam 2, electron beam collector 3, oval groove optical grating construction 4, dull and stereotyped (metal or dielectric-slab) 5 and oval electron beam channel 6.
Below respectively each part in the present embodiment oval groove optical grating construction Smith-Purcell effect THz wave radiation source is described in detail.
Described gun cathode 1 is for launching the electron beam 2 of certain voltage.Wherein, gun cathode can be made up of ribbon beam, circle and any one shape such as oval.Corresponding thereto, Electron Beam Shape also can be banded (namely plane), any one shape such as circular and oval.
Described electron beam collector 5, be arranged at gun cathode 1 just to position, there is the electron beam after mutual effect for collecting with described oval groove optical grating construction 4 surface, between gun cathode and electron beam collector, forming Beam and wave interaction district.
Described oval groove optical grating construction 4, is arranged in Beam and wave interaction district, and it is periodic grating structure, and grating groove is the oval groove for ellipse.Wherein, oval groove can be vacuum tank and the media slot of filling certain dielectric constant, and this structure can weaken the impact of dispersion, when being operated in backward wave state, effectively can reduce the starting oscillation current of structure.Described oval groove optical grating construction is periodic structure, and it adopts metal to make.
Described electron beam channel 6, the exit direction along electron beam is arranged at the centre position (namely) of described oval groove optical grating construction upper surface, vertical with oval groove, parallel with the electron beam that gun cathode is launched.Described electron beam channel 6 is partially submerged in described oval groove optical grating construction.Wherein, corresponding with Electron Beam Shape, electron beam channel shape also can be any one shape such as banded, circular and oval, for the transmission of electron beam.
Described dull and stereotyped 5, be arranged at position directly over optical grating construction, parallel with oval groove.Wherein, flat board can be metallic plate or the dielectric-slab with certain dielectric constant, collects for making the energy being radiated open space.
The electron beam that described gun cathode 1 is launched is through electron beam channel 6, interact with oval groove optical grating construction 4 and produce clustering electron beam group, the electron beam group of clustering excites the THz ripple of Smith-Purcell effect, THz ripple collects by described dull and stereotyped 5, realize power amplification and growth rate raising, and realize THz wave by the coupled structure of end to export, the electron beam after mutual effect is collected by collector.
It should be noted that: by regulating the operating voltage of external load on gun cathode 1, this arrangement works can be realized and to be expert at wave band or backward wave section.The frequency of radiation is different along with the difference of viewing angle, realizes the frequency-adjustable in the present embodiment THz wave radiation source.
The present embodiment oval groove optical grating construction Smith-Purcell effect THz wave radiation source not only achieves the generation of THz signal, but also the enhancing of Beam and wave interaction is achieved by oval groove, thus the distance shortened needed for electron beam clustering, reduce the development difficulty of electron-optical system.
In addition, the above-mentioned definition to each element is not limited in the various concrete structure or shape mentioned in execution mode, and those of ordinary skill in the art can replace it with knowing simply.
In sum, the invention provides a kind of oval groove optical grating construction Smith-Purcell effect THz wave radiation source.This THz wave radiation source adopts oval groove grating as interacting formations, by electron beam channel being partially submerged in grating the generation of enhancing and the periodic electron bundle group realizing Beam and wave interaction, thus produce relevant THz wave radiation source, not only achieve the while that THz ripple producing but also realize THz ripple frequency-adjustable, be conducive to the extensive use in THz wave radiation source.
Above-described embodiment is only and technical conceive of the present invention and feature is described, its object is to person skilled in the art can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.Within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be encompassed within protection scope of the present invention.
Claims (8)
1. there is an oval groove optical grating construction terahertz radiation source, it is characterized in that, comprising:
Gun cathode, this negative electrode is for launching the electron beam of certain speed;
Electron beam collector, be arranged at described gun cathode just to position, form Beam and wave interaction district between described gun cathode and described electron beam collector;
Oval groove optical grating construction, it is arranged in described Beam and wave interaction district;
Electron beam channel, the exit direction along electron beam is arranged at the centre position of described oval groove optical grating construction upper surface, vertical with described oval groove, and parallel with the electron beam that described gun cathode is launched;
Flat board, is arranged at position directly over described oval groove optical grating construction, with the opening parallel of described oval groove;
Wherein, the electron beam that described gun cathode is launched is through described electron beam channel, interact with described oval groove optical grating construction and produce clustering electron beam group, and then the THz wave produced based on relevant Smith-Purcell effect, described THz wave is carried out energy by described flat board and is collected, realize power amplification and growth rate raising, and collected by described electron beam collector through the electron beam of interacting formations.
2. the terahertz radiation source with oval groove optical grating construction according to claim 1, is characterized in that, described oval groove optical grating construction is periodic structure.
3. the terahertz radiation source with oval groove optical grating construction according to claim 1, is characterized in that, described oval groove optical grating construction is made of metal.
4. the terahertz radiation source with oval groove optical grating construction according to claim 1, is characterized in that, the oval groove of described oval groove optical grating construction is vacuum tank or the media slot being filled with certain dielectric constant.
5. the terahertz radiation source with oval groove optical grating construction according to claim 1, is characterized in that, described flat board is metallic plate or the dielectric-slab with certain dielectric constant.
6. the terahertz radiation source with oval groove optical grating construction according to claim 1, is characterized in that, the shape of described gun cathode is any one in following shape: banded, circular or oval.
7. oval groove optical grating construction Smith-Purcell effect THz wave radiation source according to claim 1, is characterized in that, described electron beam channel shape is any one in following shape: rectangle, circle or oval.
8. electron beam channel according to claim 1, is characterized in that, a part for described electron beam channel embeds in described oval groove optical grating construction.
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Cited By (14)
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| CN105826150A (en) * | 2016-04-08 | 2016-08-03 | 中国科学技术大学 | Terahertz radiation source based on special Smith-Purcell effect |
| CN105938972A (en) * | 2016-07-01 | 2016-09-14 | 中国科学技术大学 | Double-electron-beam double-grating based terahertz free electron laser source |
| CN106054291A (en) * | 2016-06-16 | 2016-10-26 | 北京大学 | Mixed metal-dielectric SSP (Spoof Surface Plasmon) periodic grating system as well as application and method thereof |
| CN107706702A (en) * | 2017-09-26 | 2018-02-16 | 中国科学技术大学 | A kind of electromagenetic wave radiation system and method |
| CN107863672A (en) * | 2017-11-27 | 2018-03-30 | 中国科学技术大学 | A kind of electromagenetic wave radiation method and radiating system |
| CN108258574A (en) * | 2018-01-15 | 2018-07-06 | 中国科学技术大学 | A kind of electromagenetic wave radiation system and method for radiating |
| CN108471039A (en) * | 2018-04-02 | 2018-08-31 | 电子科技大学 | A kind of optical grating construction for generating millimeter wave and terahertz emission |
| CN108550509A (en) * | 2018-05-21 | 2018-09-18 | 中国科学技术大学 | A kind of electromagenetic wave radiation system and electromagenetic wave radiation method |
| CN108761609A (en) * | 2018-06-05 | 2018-11-06 | 电子科技大学 | A kind of grating of enhancing Smith-Purcell radiation |
| CN108987220A (en) * | 2018-06-14 | 2018-12-11 | 深圳大学 | A kind of single grid slow-wave structure with curved profile |
| CN109916862A (en) * | 2019-02-27 | 2019-06-21 | 北京大学 | A kind of enhancing polychrome is concerned with SPR device and its control method |
| CN110137781A (en) * | 2019-05-07 | 2019-08-16 | 电子科技大学 | A kind of surface wave is converted into the optical grating construction of Smith-Purcell radiation |
| CN110416041A (en) * | 2019-06-21 | 2019-11-05 | 中国科学院电子学研究所 | A kind of Embedded Double electronics note Terahertz backward wave oscillator |
| CN113013003A (en) * | 2021-03-23 | 2021-06-22 | 东南大学 | Free electron laser system of dielectric grating based on dielectric waveguide coupling |
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Cited By (22)
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| CN105826150A (en) * | 2016-04-08 | 2016-08-03 | 中国科学技术大学 | Terahertz radiation source based on special Smith-Purcell effect |
| CN106054291A (en) * | 2016-06-16 | 2016-10-26 | 北京大学 | Mixed metal-dielectric SSP (Spoof Surface Plasmon) periodic grating system as well as application and method thereof |
| CN106054291B (en) * | 2016-06-16 | 2018-03-30 | 北京大学 | Metal medium SSP periodic optical grating systems of mixed type and application thereof and method |
| CN105938972B (en) * | 2016-07-01 | 2019-04-26 | 中国科学技术大学 | A kind of Terahertz free-electron laser source based on bielectron note double grating |
| CN105938972A (en) * | 2016-07-01 | 2016-09-14 | 中国科学技术大学 | Double-electron-beam double-grating based terahertz free electron laser source |
| CN107706702A (en) * | 2017-09-26 | 2018-02-16 | 中国科学技术大学 | A kind of electromagenetic wave radiation system and method |
| CN107706702B (en) * | 2017-09-26 | 2019-07-23 | 中国科学技术大学 | A kind of electromagenetic wave radiation system and method |
| CN107863672A (en) * | 2017-11-27 | 2018-03-30 | 中国科学技术大学 | A kind of electromagenetic wave radiation method and radiating system |
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| CN108258574B (en) * | 2018-01-15 | 2019-11-22 | 中国科学技术大学 | A kind of electromagenetic wave radiation system and method for radiating |
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| CN108550509B (en) * | 2018-05-21 | 2019-10-25 | 中国科学技术大学 | A kind of electromagenetic wave radiation system and electromagenetic wave radiation method |
| CN108550509A (en) * | 2018-05-21 | 2018-09-18 | 中国科学技术大学 | A kind of electromagenetic wave radiation system and electromagenetic wave radiation method |
| CN108761609A (en) * | 2018-06-05 | 2018-11-06 | 电子科技大学 | A kind of grating of enhancing Smith-Purcell radiation |
| CN108987220A (en) * | 2018-06-14 | 2018-12-11 | 深圳大学 | A kind of single grid slow-wave structure with curved profile |
| CN109916862A (en) * | 2019-02-27 | 2019-06-21 | 北京大学 | A kind of enhancing polychrome is concerned with SPR device and its control method |
| CN109916862B (en) * | 2019-02-27 | 2020-06-02 | 北京大学 | Enhanced multicolor coherent SPR device and control method thereof |
| CN110137781A (en) * | 2019-05-07 | 2019-08-16 | 电子科技大学 | A kind of surface wave is converted into the optical grating construction of Smith-Purcell radiation |
| CN110416041A (en) * | 2019-06-21 | 2019-11-05 | 中国科学院电子学研究所 | A kind of Embedded Double electronics note Terahertz backward wave oscillator |
| CN110416041B (en) * | 2019-06-21 | 2020-11-20 | 中国科学院电子学研究所 | Embedded double-electron-beam terahertz backward wave oscillator |
| CN113013003A (en) * | 2021-03-23 | 2021-06-22 | 东南大学 | Free electron laser system of dielectric grating based on dielectric waveguide coupling |
| CN113013003B (en) * | 2021-03-23 | 2023-08-18 | 东南大学 | Free electron laser system of dielectric grating based on dielectric waveguide coupling |
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