CN105207042B - A kind of too hereby wave radiation source with oval groove optical grating construction - Google Patents
A kind of too hereby wave radiation source with oval groove optical grating construction Download PDFInfo
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- CN105207042B CN105207042B CN201510621672.9A CN201510621672A CN105207042B CN 105207042 B CN105207042 B CN 105207042B CN 201510621672 A CN201510621672 A CN 201510621672A CN 105207042 B CN105207042 B CN 105207042B
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Abstract
The present invention provides a kind of with oval groove optical grating construction too hereby wave radiation source.The radiation source, which uses, has periodic oval groove grating as Beam and wave interaction structure.When electronics, which is infused, passes through the structure with certain speed, electronics note interacts and clustering with surface slow wave, generate electron beam group, and then Smith-Purcell coherent radiation is motivated, radiation is collected by plate or curved mirror (metal or medium), generate adjustable, compact, powerful THz wave, thus be conducive to THz wave radiation source communication, radar, electronic countermeasure, ELECTROMAGNETIC WEAPON, astronomy, medical imaging, non-destructive testing, in terms of application.
Description
Technical field
The present invention relates to vacuum electronics Terahertz Technology field more particularly to a kind of oval groove optical grating construction Smith-
Purcell effect THz wave radiation source.
Background technique
Terahertz (Terahertz, abbreviation THz) wave is a kind of electromagnetism between far infrared light wave and microwave and millimeter wave
Radiation, frequency (1THz=10 from 100GHz to 10THz12Hz), corresponding wavelength is from 3 millimeters to 30 micron, and THz wave is in electromagnetism
Occupy very special position in wave frequency spectrum, special performance gives communication, radar, electronic countermeasure, ELECTROMAGNETIC WEAPON, astronomy, medicine
The fields such as imaging, non-destructive testing, safety inspection bring profound influence.Nowadays THz technology has been used for material, life section
In the researchs such as, communication, agricultural and national security, multiple research fields interdisciplinary are formd.However, one urgently to be resolved
Does is problem: how to obtain a high power, compact adjustable room temperature THz wave radiation source? because either from electricity or optics
Angle, there are a limit all near THz frequency for common opto-electronic device: electronic device be difficult to be higher than this THz frequency
Rate, optical device are difficult to lower than this THz frequency.Therefore seek effective ways, explore the high performance THz amplitude of new mechanism development
The source of penetrating is very necessary, and is being applied of both military and civilian with important strategic importance to promotion THz wave.
There are many ways to can be used as THz emission source at present, mainly include the following categories: semiconductor THz wave radiation source is (such as
THz-QCL etc.)；THz generator based on photonics；Utilize THz wave radiation source (including the THz vacuum device, electricity of free electron
Sub- cyclotron maser and free-electron laser)；THz radiation source etc. based on high energy acclerator.THz-QCL radiation source is due to by pole
The limitation of low temperature becomes its widely applied barrier, and the power of the source the THz output based on photonics is lower, and is added based on high energy
For the THz radiation source of fast device due to needing huge accelerator, being widely applied includes also receiving in the application of military field
Greatly limitation.In THz radiation source, the coherent radiation phenomenon based on Smith-Purcell (SP) effect causes scientist
Extensive research interest and government highest attention, be more active one of research field in the world at present.Its principle is
When moving using electronics note close to grating upper surface, the radiation of millimeter wave far infrared band is generated, the frequency of radiation is with viewing angle
The variation of degree and change, referred to as SP effect.When continuous electronic note is with the interaction of grating surface slow wave and when clustering, SP radiation just becomes
At stronger coherent radiation.Representative device based on this coherent radiation has SP effect free electron laser (free-electron
Lasers, abbreviation FELs).Relatively traditional FELs, SP-FELs have the advantages such as compact, adjustable, high-power, therefore it becomes
One hot research field of vacuum electronics THz radiation source.
1998, the optical grating construction that Urata et al. is 0.17mm using the continuous electronic note drive cycle of 30-50keV led to
Crossing Beam and wave interaction makes electronics infuse clustering, the superradiance phenomenon of SP effect has been observed in an experiment, to the SP of Development of Novel
FELs has great importance.Optical grating construction uses rectangular channel metal grating in experiment, this structure dispersion is very strong and work is being returned
When wavy state, need biggish electric current could starting of oscillation.2005, it was 15MeV's that MIT group, which generates energy using linear accelerator,
Preparatory clustering electron beam group, carrys out drive cycle with this for the grating of 1cm, observed THz wave on 90 ° of directions.It is adopted in experiment
Use stepped grating as Beam and wave interaction structure, advantage is to improve efficiency, but the electron beam group for generating preparatory clustering needs
Huge accelerator is wanted, its extensive use is limited.
Summary of the invention
(1) technical problems to be solved
In view of above-mentioned technical problem, the present invention provides a kind of oval groove optical grating construction Smith-Purcell effect THz waves
Coherent source.
(2) technical solution
According to an aspect of the invention, there is provided a kind of have oval groove optical grating construction terahertz radiation source, spy
Sign is, comprising:
Gun cathode, the cathode are used to emit the electronics note of certain speed；
Electronics infuses collector, is set to the face position of the gun cathode, the gun cathode and the electronics
It infuses and forms Beam and wave interaction area between collector；
Oval groove optical grating construction is set in the Beam and wave interaction area；
Electron beam channel is set to the interposition of oval groove optical grating construction upper surface along the exit direction of electronics note
It sets, it is vertical with the oval groove and parallel with the electronics note that the gun cathode is launched；
Plate is set to the position directly above of the oval groove optical grating construction, the opening parallel with the oval groove；
Wherein, the electronics note of the gun cathode transmitting passes through the electron beam channel, with the oval groove grating knot
Configuration interaction generate clustering electron beam group, and then generate the THz wave based on relevant Smith-Purcell effect, it is described too
Hertz wave carries out energy by the plate and collects, and realizes that power amplification and growth rate improve, and passes through the electricity of interacting formations
Son note is collected by electronics note collector.
(3) beneficial effect
It can be seen from the above technical proposal that oval groove optical grating construction Smith-Purcell effect THz wave radiation of the present invention
Source has the advantages that
(1) it using periodical oval groove grating as Beam and wave interaction structure, not only reduces the dispersion of structure simultaneously but also drops
Starting oscillation current when low backward wave work is conducive to the generation of electronics note clustering and coherent radiation, to be conducive to THz wave radiation
The extensive use in source；
(2) by the way that electron beam channel to be partially submerged into optical grating construction, electronics note is reduced to the distance of grating, is enhanced
Beam and wave interaction, while THz wave radiation intensity is improved, it is advantageously implemented high power, miniaturization, the densification of radiation source, is dropped
The low development cost of device；
(3) energy for being radiated open space is converged by being located at the plate (metal plate or dielectric-slab) right above grating
Collection, is advantageously implemented the collection and output of radiation.
Detailed description of the invention
Fig. 1 is the too hereby wave radiation source three dimensional structure diagram in the present invention with oval groove optical grating construction；
Fig. 2 is the too hereby wave radiation source overall structure 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- electronics note；
3- electronics infuses collector；4- oval groove optical grating construction；
5- plate (metal plate or dielectric-slab)；6- electron beam channel.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in more detail.
It should be noted that similar or identical part all uses identical figure number in attached drawing or specification description.It is attached
The implementation for not being painted or describing in figure is form known to a person of ordinary skill in the art in technical field.In addition, though this
Text can provide the demonstration of the parameter comprising particular value, it is to be understood that parameter is equal to corresponding value without definite, but can connect
It is similar to be worth accordingly in the error margin or design constraint received.In addition, the direction term mentioned in following embodiment, such as
"upper", "lower", "front", "rear", "left", "right" etc. are only the directions with reference to attached drawing.Therefore, the direction term used be for
Explanation is not intended to limit the invention.
The present invention provides a kind of oval groove optical grating construction Smith-Purcell effect THz wave radiation sources.The THz amplitude
Source to be penetrated using periodical oval groove optical grating construction, electron beam channel is partially submerged into grating, electronics note passes through electron beam channel,
Surface slow wave interaction with grating generates the SP radiation for being located at THz frequency range, and will be radiated by plate (metal or medium)
Energy to open space collects, and is realized and is exported by coupled structure in optical grating construction end.The structure reduces dispersion and real
Show that frequency is adjustable to be collected with energy.
In an exemplary embodiment of the present invention, a kind of oval groove optical grating construction Smith-Purcell effect is provided
Answer THz wave radiation source.Fig. 1 is the structural schematic diagram according to THz wave radiation of embodiment of the present invention source.Please refer to Fig. 1, the present embodiment
Oval groove optical grating construction Smith-Purcell effect THz wave radiation source includes: gun cathode 1, electronics note 2, electronics note collection
Pole 3, oval groove optical grating construction 4, plate (metal or dielectric-slab) 5 and oval electron beam channel 6.
Individually below to each group of the present embodiment oval groove optical grating construction Smith-Purcell effect THz wave radiation source
At being partially described in detail.
The gun cathode 1 is used to emit the electronics note 2 of certain voltage.Wherein, gun cathode can be by band-like
Any one shape such as note, round and ellipse is constituted.Corresponding thereto, Electron Beam Shape is also possible to band-like (i.e. plane
Shape), any one shape such as round and ellipse.
The electronics infuses collector 5, is set to the face position of gun cathode 1, for collecting and the oval groove light
Electronics note after interaction occurs for 4 surface of grid structure, forms Beam and wave interaction between gun cathode and electronics note collector
Area.
The oval groove optical grating construction 4, is set in Beam and wave interaction area, is periodic grating structure, and grating slot
It is for the oval groove of ellipse.Wherein, oval groove can be the media slot of vacuum tank and the certain dielectric constant of filling, this structure can
To weaken the influence of dispersion, when working in backward wave state, the starting oscillation current of structure can be effectively reduced.The oval groove grating
Structure is periodic structure, and metal is used to be made.
The electron beam channel 6, the exit direction along electronics note are set in oval groove optical grating construction upper surface
Between position (i.e.), it is vertical with oval groove, it is parallel with the electronics note that gun cathode is launched.6 part of electron beam channel is embedding
Enter in the oval groove optical grating construction.Wherein, corresponding with Electron Beam Shape, electron beam channel shape be also possible to it is band-like,
Any one shape such as round and ellipse, the transmission for electronics note.
The plate 5 is set to the position directly above of optical grating construction, parallel with oval groove.Wherein, plate can be metal
Plate or dielectric-slab with certain dielectric constant, for collecting the energy for being radiated open space.
The electronics note that the gun cathode 1 emits passes through electron beam channel 6, interacts with oval groove optical grating construction 4
Clustering electron beam group, the THz wave of the electron beam group excitation Smith-Purcell effect of clustering are generated, THz wave passes through the plate
5 collect, and realize that power amplification and growth rate improve, and realize THz wave output by the coupled structure of end, by mutual
Electronics note after effect is collected by collector.
It should be understood that this structure may be implemented by adjusting operating voltage of the external load on gun cathode 1
Work wave band or the backward wave section of being expert at.The frequency of radiation is different with the difference of viewing angle, realizes the present embodiment THz wave radiation
The frequency in source is adjustable.
The present embodiment oval groove optical grating construction Smith-Purcell effect THz wave radiation source not only realizes THz signal
It generates, but also realizes the enhancing of Beam and wave interaction by oval groove, distance needed for infusing clustering so as to shorten electronics,
Reduce the development difficulty of electron-optical system.
In addition, the above-mentioned definition to each element is not limited in the various specific structures or shape mentioned in embodiment,
Those skilled in the art can replace with simply being known to it.
In conclusion the present invention provides a kind of oval groove optical grating construction Smith-Purcell effect THz wave radiation source.It should
THz wave radiation source note-as interacting formations, is realized by the way that electron beam channel to be partially submerged into grating using oval groove grating
The enhancing of wave interaction and the generation of periodical electron beam group had both realized THz wave to generate relevant THz wave radiation source
It generates and realizes that THz wave frequency rate is adjustable, is conducive to the extensive use in THz wave radiation source again simultaneously.
The technical concepts and features of above-described embodiment only to illustrate the invention, its object is to allow person skilled in the art
Scholar cans understand the content of the present invention and implement it accordingly, and it is not intended to limit the scope of the present invention.It is all of the invention
Within spirit and principle, any modification, equivalent substitution, improvement and etc. done be should be covered by the protection scope of the present invention.
Claims (7)
1. one kind has oval groove optical grating construction terahertz radiation source characterized by comprising
Gun cathode, the cathode are used to emit the electronics note of certain speed；
Electronics infuses collector, is set to the face position of the gun cathode, and the gun cathode and electronics note are received
Beam and wave interaction area is formed between collector；
Oval groove optical grating construction is set in the Beam and wave interaction area；
Electron beam channel is set to the middle position of oval groove optical grating construction upper surface along the exit direction of electronics note, with
The oval groove is vertical, and parallel with the electronics note that the gun cathode is launched；The electron beam channel it is a part of embedding
Enter in the oval groove optical grating construction；
Plate is set to the position directly above of the oval groove optical grating construction, the opening parallel with the oval groove；
Wherein, the electronics note of the gun cathode transmitting passes through the electron beam channel, with the oval groove optical grating construction phase
Interaction generates clustering electron beam group, and then generates the THz wave based on relevant Smith-Purcell effect, the Terahertz
Wave carries out energy by the plate and collects, and realizes that power amplification and growth rate improve, and the electronics for passing through interacting formations is infused
It is collected by electronics note collector.
2. the terahertz radiation source according to claim 1 with oval groove optical grating construction, which is characterized in that described
Oval groove optical grating construction is periodic structure.
3. the terahertz radiation source according to claim 1 with oval groove optical grating construction, which is characterized in that described ellipse
Circular groove optical grating construction is made of metal.
4. the terahertz radiation source according to claim 1 with oval groove optical grating construction, which is characterized in that described ellipse
The oval groove of circular groove optical grating construction is vacuum tank or the media slot filled with certain dielectric constant.
5. the terahertz radiation source according to claim 1 with oval groove optical grating construction, which is characterized in that described flat
Plate is metal plate or the dielectric-slab with certain dielectric constant.
6. the terahertz radiation source according to claim 1 with oval groove optical grating construction, which is characterized in that the electricity
The shape of sub- rifle cathode is any one in following shape: band-like, round or ellipse.
7. oval groove optical grating construction Smith-Purcell effect THz wave radiation according to claim 1 source, feature exist
In the electron beam channel shape is any one in following shape: rectangle, round or ellipse.
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| CN105826150B (en) * | 2016-04-08 | 2017-09-29 | 中国科学技术大学 | A kind of terahertz emission source based on special Smith Purcell effects |
| 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 |
| 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 |
| CN107863672B (en) * | 2017-11-27 | 2019-06-21 | 中国科学技术大学 | A kind of electromagenetic wave radiation method and radiating system |
| 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 |
| 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 |
| 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 |
| 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 |
| CN109916862B (en) * | 2019-02-27 | 2020-06-02 | 北京大学 | Enhanced multicolor coherent SPR device and control method thereof |
| CN110137781B (en) * | 2019-05-07 | 2020-11-17 | 电子科技大学 | Grating structure for converting surface wave into Smith-Purcell radiation |
| 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 |
| 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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