CN103500870B - Reflection type resonant cavity for measuring sample surface state in profound hypothermia high-intensity magnetic field - Google Patents
Reflection type resonant cavity for measuring sample surface state in profound hypothermia high-intensity magnetic field Download PDFInfo
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- CN103500870B CN103500870B CN201310469893.XA CN201310469893A CN103500870B CN 103500870 B CN103500870 B CN 103500870B CN 201310469893 A CN201310469893 A CN 201310469893A CN 103500870 B CN103500870 B CN 103500870B
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Abstract
The invention discloses a reflection type resonant cavity for measuring the sample surface state in a profound hypothermia high-intensity magnetic field. The reflection type resonant cavity mainly consists of a coaxial cable assembly, a microwave separating plate and panel installing type connector, a resonant cavity cover plate, a resonant cavity, a copper sheet A, a copper sheet B, a screw A, a screw B and the like. The reflection type resonant cavity is mainly characterized in that microwaves are guided into the resonant cavity in the profound hypothermia high-intensity magnetic field environment by coaxial cables, and the combination of the microwave measurement and the profound hypothermia high-intensity magnetic field transporting measurement is realized. The system provides an effective tool for studying the profound hypothermia magnetic transportation of the surface state of two-dimensional nano-structure materials such as topological insulators.
Description
Technical field
The present invention relates to a kind of reflection type resonant cavity, in particular to a kind of reflection type resonant cavity for measuring sample surfaces state, by utilizing the method for quality factor (Q factor) measuring reflection type resonant cavity under pole low temperature, high-intensity magnetic field, not destroying, under contactless condition, the sample surfaces state in resonant cavity is characterized and research material surface state to the response characteristic etc. of microwave.
Background technology
In the means of testing that semiconductor materials and devices is relevant, magnetic transport is a kind of important and research means on basis, in order to the carrier concentration of research material, and the essential information such as type and mobility.And under the condition of profound hypothermia, numerous quantum effect presents, as the correction to classical conductance, the quantum effect of conductance reflects the physical messages such as the spin properties of material, these characteristics may at the physical device of a new generation---and be applied in spintronics devices, therefore there is important researching value.Study the quantum effect of conductance and become a new subject, the phenomenon of research comprises magnetoresistance oscillations, quantum hall effect, weak local and weak anti-localization effect, quantum tunneling etc.
At present these research major parts adopt traditional electrical testing method, be therefore subject to the charge carrier on such as material substrate conductance, three-dimensional, sample etches not easily with may destroy sample and the sample electrode preparation restriction such as not easily.The present invention adopts the method for the quality factor (Q factor) measuring reflection type resonant cavity to measure, avoid above-mentioned some on the impact of experimental result, for providing good research tool to the two-dimensional nanostructure material magnetic transport tests such as such as topological insulator and spin resonance research under pole low temperature, high-intensity magnetic field, it is the powerful of study two-dimensional nanostructure and structure coherent electron device.
Summary of the invention
The object of this invention is to provide a kind of reflection type resonant cavity, by a kind of contactless, non-destructive method for microwave measurement, the surface state character of study sample can be carried out.
Technical scheme of the present invention is as follows:
Test macro is made up of co-axial cable component 101, microwave dividing plate and panel installed connector 102, cover plate of resonant cavity 103, resonant cavity 104, copper sheet A105, copper sheet B106, screw A107, screw B108, and basic structure is shown in accompanying drawing 1.
Described microwave dividing plate is connected with co-axial cable component 101 with panel installed connector 102, its end has an antenna, can be used for launched microwave and receive microwave, microwave dividing plate and the middle hole of panel installed connector 102 lower end antenna alignment cover plate of resonant cavity 103, and fixing with screw B108; Cover plate of resonant cavity 103 minor face two trisection points respectively there is a screw, corresponding with resonant cavity 104 two ends screw, fixed by screw A107 and resonant cavity 104; Cover plate of resonant cavity 103 centre has an aperture, and microwave enters resonant cavity 104 by the antenna transmission end of microwave dividing plate and panel installed connector 102 by aperture, reflects Hou Yuan road return through resonant cavity 104; Copper sheet A105, copper sheet B106 are positioned in resonant cavity 104 and regulate resonant cavity size.
Described co-axial cable component 101 operating frequency range should be corresponding with resonant cavity 104 resonance frequency, and its loss, standing wave, mechanical phase stability should meet test request; Co-axial cable component 101 connector adopts male, directly can be connected with the female connector of microwave dividing plate with panel installed connector 102.
Described microwave dividing plate and the operating frequency of panel installed connector 102 should be able to meet the resonance frequency comprising resonant cavity 104.
Described resonant cavity 104 shape is hollow bottomed cylindrical shape, and centre hollows out a cuboid, and form resonant cavity, surrounding can be arc-shaped; There is support on both sides, and available screw B108 is fixed on test desired location; Another dual-side there is screw upward, cover plate of resonant cavity 103 can be fixed thereon; Make material selection red copper, electroplate.
Described copper sheet A105 and copper sheet B106 size corresponding with resonant cavity 104, just in time vertically can be placed on to regulate the size of its resonant cavity in resonant cavity 104, thus regulate the resonance frequency of resonant cavity 104, realize the measurement under different frequency microwave.
Described screw A107 and screw B108 adopts copper screw.
The invention has the advantages that: the skin effect that present invention utilizes microwave, thus solve the interference of sample body conductance when conventional electrical transports test, adopt contactless, non-destructive method to measure, method is simple and convenient, directly can measure sample.To avoid when testing under microwave microwave heating to the impact of sample tests in the past, achieve the on-spot study utilizing microwave to carry out electricity transport property and spin properties, for the two-dimensional nanostructure material surface state magnetic transport researchs such as such as topological insulator provide a kind of effective tool.
Accompanying drawing explanation
Fig. 1: reflection type resonant cavity assembling schematic diagram.In figure, each several part is: co-axial cable component 101, microwave dividing plate and panel installed connector 102, cover plate of resonant cavity 103, resonant cavity 104, copper sheet A105, copper sheet B106, screw A107, screw B108.
Fig. 2: vertical view in reflection type resonant cavity chamber.In figure, each several part is: resonant cavity 104, copper sheet A105, copper sheet B106, screw A107.
Embodiment
Illustrate according to summary of the invention and accompanying drawing below and provide a good example of the present invention, further illustrate the technology of the present invention details, architectural feature and functional characteristics in conjunction with example.But this example does not limit the scope of the invention, conform with the example described in summary of the invention and accompanying drawing explanation and all should comprise within the scope of the present invention.
Co-axial cable component 101 adopts the Micro coax UFB311A coaxial cable of the low standing wave of the high and low loss of frequency of utilization, mechanical phase good stability, and operating frequency range is DC ~ 26.5GHz.
Microwave dividing plate and panel installed connector 102 adopt ROD-SMA-KFD(female), operating frequency range is DC ~ 18GHz.
Cover plate of resonant cavity 103, resonant cavity 104 and copper sheet A105, copper sheet B106 all adopt red copper material, outside silver-plated anti-oxidation.
The long 25mm of cover plate of resonant cavity 103, wide 21mm, thickness is 3mm, minor face respectively has two screws, and fixed by screw A107 and resonant cavity 104, cover plate of resonant cavity 103 centre then has the aperture of a diameter 1.27mm, for the transmission of microwave.
The outside Lower Half of resonant cavity 104 is cylindrical, high 11mm, and outer circle diameter is 31mm, and the first half is for stretching out support, and long 30mm, for fixing resonant cavity 104 and test place; Inside then hollows out formation one rectangle resonant cavity, and length and width are all 20mm, dark 9.5mm, and in order to easy to process, respectively there is the quadrant of a diameter 3mm corner.Cover plate of resonant cavity 103, copper sheet A105 and copper sheet B106 then must be corresponding with the size of resonant cavity 104.
Copper sheet A105 and copper sheet B106 can be vertically placed in resonant cavity 101, changes its resonance frequency by adjusting its size.The minimum resonance frequency of resonant cavity is:
(a>b>c, a, b, c are rectangular cavity three length of sides), according to our system dimension, our the rectangular cavity size of design is that 20mm*20mm*9.5mm to 20mm*9.5mm*9.5mm is adjustable, and corresponding resonance frequency can be tuning in 10.6GHz to 17.5GHz scope.
Screw A107 adopts M1.6*4 screw, fixing for cover plate of resonant cavity 103 and resonant cavity 104; Screw B108 adopts M2.5*4 screw, for resonant cavity 104 is fixed on test desired location.
In reflection type resonant cavity method of measurement, microwave transmission through co-axial cable component 101, microwave dividing plate and panel installed connector 102 by aperture on cover plate of resonant cavity 103, be applied in resonant cavity 104, the measuring-signal of gained returns along former road, and detect its signal power size by wave detector, draw resonant curve, thus obtain its quality factor.Sample surfaces state can be obtained in chamber with the variation relation in magnetic field under varying magnetic field.
Claims (6)
1. one kind for measuring the reflection type resonant cavity of sample surface state in profound hypothermia high-intensity magnetic field, comprise: co-axial cable component (101), microwave dividing plate and panel installed connector (102), cover plate of resonant cavity (103), resonant cavity (104), copper sheet A (105), copper sheet B (106), screw A (107) and screw B (108), is characterized in that:
Described microwave dividing plate is connected with co-axial cable component (101) with panel installed connector (102), its end has an antenna, can be used for launched microwave and receive microwave, the middle hole of microwave dividing plate and panel installed connector (102) lower end antenna alignment cover plate of resonant cavity (103), and fixing; Cover plate of resonant cavity (103) minor face two trisection points respectively there is a screw, corresponding with resonant cavity (104) two ends screw, fixed by screw A (107) and resonant cavity (104); Cover plate of resonant cavity (103) centre has an aperture, microwave enters resonant cavity (104) by the antenna transmission end of microwave dividing plate and panel installed connector (102) by aperture, returns through resonant cavity (104) reflection Hou Yuan road; Copper sheet A (105), copper sheet B (106) can be vertically placed in resonant cavity (104), regulate its size while ensureing resonant cavity cuboid; Screw B (108) is for being fixed on test desired location by resonant cavity (104).
2. a kind of reflection type resonant cavity for measuring sample surface state in profound hypothermia high-intensity magnetic field according to claim 1, it is characterized in that: described co-axial cable component (101) operating frequency range should be corresponding with resonant cavity (104) resonance frequency, and its loss, standing wave, mechanical phase stability should meet test request; Co-axial cable component (101) connector adopts male, directly can be connected with the female connector of microwave dividing plate with panel installed connector (102).
3. a kind of reflection type resonant cavity for measuring sample surface state in profound hypothermia high-intensity magnetic field according to claim 1, is characterized in that: the operating frequency of described microwave dividing plate and panel installed connector (102) should be able to meet the resonance frequency comprising resonant cavity (104).
4. a kind of reflection type resonant cavity for measuring sample surface state in profound hypothermia high-intensity magnetic field according to claim 1, it is characterized in that: described resonant cavity (104) shape is hollow bottomed cylindrical shape, centre hollows out a cuboid, and form resonant cavity, surrounding can be arc-shaped; There is support on both sides, and available screw B (108) is fixed on test desired location; Another dual-side there is screw upward, cover plate of resonant cavity (103) can be fixed thereon; Make material selection red copper, electroplate.
5. a kind of reflection type resonant cavity for measuring sample surface state in profound hypothermia high-intensity magnetic field according to claim 1, it is characterized in that: described copper sheet A (105) and copper sheet B (106) size corresponding with resonant cavity (104), can just in time vertically be placed in resonant cavity (104) to regulate the size of its resonant cavity, thus regulate the resonance frequency of resonant cavity (104), realize the measurement under different frequency microwave.
6. a kind of reflection type resonant cavity for measuring sample surface state in profound hypothermia high-intensity magnetic field according to claim 1, is characterized in that: described screw A (107) and screw B (108) adopts copper screw.
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| CN201310469893.XA CN103500870B (en) | 2013-10-10 | 2013-10-10 | Reflection type resonant cavity for measuring sample surface state in profound hypothermia high-intensity magnetic field |
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| CN105510282A (en) * | 2016-01-13 | 2016-04-20 | 中国科学院上海技术物理研究所 | System for measuring photoluminescence of sample in deep low-temperature and high-intensity magnetic field |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101187683A (en) * | 2007-10-30 | 2008-05-28 | 电子科技大学 | Low consumption dielectric material high temperature complex dielectric constant test device and method |
| EP2043193A1 (en) * | 2007-09-28 | 2009-04-01 | Alcatel Lucent | A directional coupler and a method thereof |
| CN202330564U (en) * | 2011-11-04 | 2012-07-11 | 电子科技大学 | Variable-temperature measurement device for dielectric performance of dielectric material based on quasi-optics resonant cavity |
| CN203536550U (en) * | 2013-10-10 | 2014-04-09 | 中国科学院上海技术物理研究所 | Reflective resonant cavity for measuring sample surface states in cryogenic strong magnetic field |
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| US20070044708A1 (en) * | 2005-08-26 | 2007-03-01 | Magnetrol International, Inc. | Ultrasonic sensor assembly and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2043193A1 (en) * | 2007-09-28 | 2009-04-01 | Alcatel Lucent | A directional coupler and a method thereof |
| CN101187683A (en) * | 2007-10-30 | 2008-05-28 | 电子科技大学 | Low consumption dielectric material high temperature complex dielectric constant test device and method |
| CN202330564U (en) * | 2011-11-04 | 2012-07-11 | 电子科技大学 | Variable-temperature measurement device for dielectric performance of dielectric material based on quasi-optics resonant cavity |
| CN203536550U (en) * | 2013-10-10 | 2014-04-09 | 中国科学院上海技术物理研究所 | Reflective resonant cavity for measuring sample surface states in cryogenic strong magnetic field |
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