CN103779763B - A kind of Terahertz power source high-frequency structure based on array grating structure - Google Patents
A kind of Terahertz power source high-frequency structure based on array grating structure Download PDFInfo
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- CN103779763B CN103779763B CN201410032405.3A CN201410032405A CN103779763B CN 103779763 B CN103779763 B CN 103779763B CN 201410032405 A CN201410032405 A CN 201410032405A CN 103779763 B CN103779763 B CN 103779763B
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Abstract
A kind of Terahertz power source high-frequency structure based on array grating structure, belongs to Terahertz vacuum electron device field.Described high-frequency structure is made up of the rectangular channel in upper and lower speculum respectively spherical mirror and the quasi-optical resonator of cylindrical mirror, array metal grating, cylindrical mirror and the circular coupling aperture on spherical mirror, and used by system, metal material is oxygen-free copper.Described array metal grating grating two ends are embedded in the rectangular channel in cylindrical mirror, are periodic arrangement with z direction in the x-direction, utilize cylindrical electron beam to carry out noting wave energy exchange.The present invention is a kind of method realizing the generation of terahertz electromagnetic wave signal, cylindrical electron beam can be used to carry out noting ripple interaction, have the advantages that electronic efficiency is high, power output is big, and can effectively reduce the cathode emission current density of focusing magnetic field intensity and device.
Description
Art
The invention belongs to Terahertz vacuum electron device field, a kind of terahertz based on array grating structure
Hereby power source high-frequency structure.
Background technology
Due to the character of THz ripple uniqueness and in image objects, environmental monitoring, medical diagnosis, radio astronomy, especially
It is to have great scientific value in satellite communication and the field such as military radar, national defence safety check and be widely applied
Prospect, and paid attention to by the most widely.But up to this point, the development of Terahertz Technology and application
Limiting to the most very much, its major obstacle is exactly that its transmitter-receiver device is the heaviest and expensive.
The mechanism produced according to THz radiation, can be divided into two big classes: a class is to utilize electronics by its radiation source
Method, another kind of is the method utilizing optics.But, wherein great majority otherwise equipment is complicated, huge, effect
Rate is relatively low, or is difficult under room temperature operating.The most effectively produce high power, high-energy, high efficiency, and energy
At room temperature steady running, the THz radiation source of compact conformation, become the study hotspot of THz technology.
Vacuum electron device obtains rapid development, particularly micro-processing technology with true in terms of THz radiation source
Empty electronics combines the Investigation of Micro-Vacuum Electronic Devices formed, and utilizes microwave tube to be distributed action principle, makes operating frequency
Terahertz field can be reached.Orotron is to be excited generation electromagnetic field in open cavity by chip type electronic bundle
Around irradiation device, can be used as small compact type terahertz emission source, but it be inefficient, and bigger starting of oscillation
Electric current proposes the highest requirement to negative electrode, simultaneously because the current density of chip type electronic bundle is relatively big, to focusing on magnetic
The requirement of field is the highest.
Summary of the invention
The invention provides a kind of Terahertz power source high-frequency structure based on array grating structure, utilize cylinder
Electron beam and the radio-frequency field within array grating carry out noting-wave energy exchange, suitably choose described array metal light
Grid and the consitutional size of quasi-optical resonator, can realize the output of system high-frequency signal.The present invention
The radio frequency system provided has the advantages that electronic efficiency is high, power output is big, and it is strong effectively to reduce focusing magnetic field
Degree and the cathode emission current density of device.
The technical solution adopted in the present invention is:
A kind of Terahertz power source high-frequency structure based on array grating structure, including quasi-optical resonator, array
Metal grating, it is characterised in that: the speculum up and down of described quasi-optical resonator be respectively square spherical mirror and
Square plano-concave cylindrical mirror, in a z-direction, along square spherical mirror axis, described square spherical mirror is offered
There is center of circle coupling aperture, inside described square plano-concave mirror, offer small one and large one two rectangular recess being connected up and down；
Described array metal screen periods is embedded in inside less rectangular recess, and along x and z directions periodic arrangement；
The electron beam array metal screen periods orientation in the x-direction that electron gun produces is transmitted and in this high-frequency structure
Electromagnetic field carry out interaction, utilize the electromagnetic field in cylindrical electron beam and array grating to carry out noting-wave energy
Exchange.
When the cylindric electron beam produced by electron gun passes through the gap between described array metal grating, metal grating
Surface has SP radiation and produces.According to SP radiation theory, the THz electromagnetic wave that metal grating surface actuator rises
Wavelength at circle output coupling aperture is the most identical.
Theoretical according to electromagnetic mode, under mode of resonance, the propagation constant of grating surface field duration harmonic wave is 2 π n/l,
N is overtone order, and l is the cycle of grating.Select suitable electronics note speed, be allowed to and grating surface field
Certain space harmonics synchronizes.Clustering is produced under the effect that electronics note is on the scene, and by energy exchange in resonator
Electromagnetic field, electromagnetic field is by the resonance effect of quasi-optical resonator simultaneously, it is established that stable coherent oscillation.Chamber
In electromagnetic field exported by the circular coupling aperture on spherical mirror.
Described array metal grating is periodic arrangement along electron beam transmission direction, is to be passed at grating surface
Broadcast the cycle harmonic wave that constant is 2 π n/l；Described array metal grating globally mirror axis direction is periodic arrangement,
It is to increase the intensity of electromagnetic field in Beam and wave interaction region, increasing electron beam and grating surface electromagnetism simultaneously
The interaction region of ripple.Cylindric electron beam is used to carry out electron beam-ripple interaction, in order to increase device
Interaction efficiency, reduces the device requirement to cathode emission current density, reduces focusing magnetic field simultaneously.
Accompanying drawing explanation
Fig. 1 is the radio frequency system schematic diagram that the present invention provides；
Wherein: 1, spherical mirror；2, cylindrical mirror；3, array metal grating；4, rectangle matching slot；5, square
Shape groove；6, circular output coupling aperture；
Fig. 2 is described high-frequency resonant system field pattern under 285GHz frequency；
In Fig. 3: vp/ c is the speed propagated along rectangular metal grating surface of chamber pattern primary space harmonic wave and light
The ratio of speed；λ is space harmonics wavelength；
Fig. 4 is that described high-frequency structure Beam and wave interaction region electric field intensity inside high is high with double grating Diffracted radiation device
Frequently the comparison diagram of structure Beam and wave interaction region electric field intensity inside high；
Detailed description of the invention
A kind of based on array grating structure the Terahertz power source high-frequency structure that the present invention provides, including quasi-optics
Resonator, array metal grating 3, the speculum up and down of described quasi-optical resonator is respectively square spherical mirror
1 and square plano-concave cylindrical mirror 2, in the vertical direction, along square spherical mirror axis, described square sphere
Center of circle coupling aperture 6 is offered, offer inside described square plano-concave mirror that small one and large one is connected up and down two on mirror
Rectangular recess 4 and 5；It is internal that described array metal screen periods is embedded in less rectangular recess 5, and along perpendicular
Straight and horizontal direction periodic arrangement；The electron beam that electron gun produces is in the horizontal direction along week between array metal grating
Phase orientation transmission carries out interaction with the electromagnetic field in this high-frequency structure, utilizes cylindrical electron beam and array
Electromagnetic field in grating carries out noting-wave energy exchange.
Described array metal raster width b is 600 μm, the cycle l of x direction adjacent two panels array grating1For
130 μm, the interval d of adjacent two panels array grating is 65 μm, the cycle l of z direction adjacent two panels array grating2
Being 172 μm, the interval m of adjacent two panels array grating is 132 μm, and grating two ends are embedded in the rectangle in cylindrical mirror
In groove 5.The width of rectangular channel 5 is identical with array metal raster width b.
The height h of rectangular channel 42It is 800 μm, width b2It is 1500 μm.The Main Function of rectangular channel 4 is to increase
Strong field intensity within rectangular channel 5, the determination principle of the height and the width of rectangular channel 4 is rectangle under this dimensional parameters
Electric-field intensity within groove 5 is maximum.
The bore L of square plano-concave cylindrical mirror 2 is 5265 μm, and radius of curvature R is 90000 μm, and its surface is arrived
Distance f between bore and the identical square spherical mirror 1 of the equal and square cylindrical mirror 2 of radius of curvature is 893 μm.
Utilize simulation software CST to build the structural model determined by above-mentioned several junction parameters, calculate the resonant frequency of gained
For 285GHz, fields inside is distributed as shown in Figure 2.
According to Cherenkov's synchronous condition, calculate the chamber pattern primary space harmonic wave dispersion curve of resulting structures, as
Shown in Fig. 3.As shown in Figure 3: speed is the electron beam 285GHz with SP radiation generation of 0.129 times of light velocity
The chamber pattern primary space harmonic synchronous of high-frequency signal, electromagnetic field is the standard of 285GHz by resonant frequency simultaneously
The resonance effect of optical resonator, it is established that stable coherent oscillation.
Electric-field intensity within described high-frequency structure and double grating high-frequency structure internal electric intensity to such as Fig. 4, institute
State high-frequency structure chamber electric field intensity inside high to be remarkably reinforced.This high-frequency structure uses cylindric electron beam to note
-ripple interaction, it is possible to increase interaction efficiency, increase power output.In the situation that power output level is identical
Under, this high-frequency structure can effectively reduce cathode emission current density, promotes cathode life, and reduces focusing
The requirement of magnetic field intensity.
Claims (1)
1. a Terahertz power source high-frequency structure based on array grating structure, including quasi-optical resonator, array metal grating, it is characterized in that: the speculum up and down of described quasi-optical resonator is respectively square spherical mirror and square plano-concave cylindrical mirror, in a z-direction, along square spherical mirror axis direction, offer center of circle coupling aperture on described square spherical mirror, inside described square plano-concave cylindrical mirror, offer small one and large one two rectangular recess being connected up and down；Described array metal grating is embedded in inside less rectangular recess, and along x and z directions periodic arrangement；The electron beam array metal screen periods orientation in the x-direction transmission that electron gun produces, carries out interaction with the electromagnetic field in this high-frequency structure；
Described beam cross section is cylindric.
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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 |
| CN110571626B (en) * | 2019-08-28 | 2021-08-06 | 中国科学院电子学研究所 | Terahertz radiation source for planar multi-electron-beam excitation graphene sub-wavelength integrated grating |
| CN111029889B (en) * | 2020-03-11 | 2020-09-01 | 蓝科微电子(深圳)有限公司 | Terahertz laser based on single high-temperature heat source |
| CN111799640B (en) * | 2020-06-24 | 2021-07-27 | 清华大学 | Terahertz radiator based on stimulated amplification coherent SPR radiation |
| CN113872021B (en) * | 2021-09-28 | 2023-04-04 | 北京环境特性研究所 | Dual-band terahertz wave generating device and method |
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| US20120119183A1 (en) * | 2006-08-01 | 2012-05-17 | Kharas Boris G | Fabrication of an integrated terahertz source using field emitter array with grating structure |
| CN102403180A (en) * | 2010-09-08 | 2012-04-04 | 中国科学院电子学研究所 | Distribution terahertz oscillator |
| CN102739170A (en) * | 2012-06-21 | 2012-10-17 | 合肥工业大学 | High-frequency structure for THz power amplifier |
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