CN103500870A - 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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- CN103500870A CN103500870A CN201310469893.XA CN201310469893A CN103500870A CN 103500870 A CN103500870 A CN 103500870A CN 201310469893 A CN201310469893 A CN 201310469893A CN 103500870 A CN103500870 A CN 103500870A
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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 reflective resonant cavity, be particularly related to a kind of for measuring the reflective resonant cavity of sample surfaces state, the method of the quality factor (the Q factor) by utilize measuring reflective resonant cavity under utmost point low temperature, high-intensity magnetic field, not destroying, under contactless condition, the sample surfaces state in resonant cavity is characterized and the research material surface state to the response characteristic of microwave etc.
Background technology
At semiconductor materials and devices, in relevant means of testing, it is a kind of important and basic research means that magnetic transports, in order to the carrier concentration of research material, the essential informations such as type and mobility.And under the condition of profound hypothermia, numerous quantum effects present, as the correction that classical electricity is led, the quantum effect that electricity is led reflects the physical messages such as spin properties of material, these characteristics may be at physical device of new generation---and be applied in the spintronics device, therefore there is important researching value.The quantum effect that electricity is led is studied becomes a new subject, and the phenomenon of research comprises magnetoresistance oscillations, quantum hall effect, weak local and anti-weak local effect, quantum tunneling etc.
At present these researchs are most of adopts traditional electrical testing method, therefore be subject to such as the material substrate electricity lead, charge carrier, sample corrosion on three-dimensional is difficult for and may destroy sample and the sample electrode preparation such as is difficult at the restriction.The present invention adopts the method for the quality factor (the Q factor) of measuring reflective resonant cavity to be measured, avoided above-mentioned some impact on experimental result, for under utmost point low temperature, high-intensity magnetic field, to transport test and spin resonance researchs such as two-dimensional nanostructure material magnetic such as topological insulators, providing good research tool, it is the powerful of study two-dimensional nanostructure and the relevant electronics device of structure.
Summary of the invention
The purpose of this invention is to provide a kind of reflective resonant cavity, can pass through a kind of contactless, non-destructive method for microwave measurement, carry out the surface state character of study sample.
Technical scheme of the present invention is as follows:
Test macro is comprised 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, hole in the middle of microwave dividing plate and panel installed connector 102 lower end antenna alignment cover plate of resonant cavities 103, and fix with screw B108; On two trisection points of cover plate of resonant cavity 103 minor face, a screw is respectively arranged, corresponding with resonant cavity 104 two ends screws, fixing by screw A107 and resonant cavity 104; Cover plate of resonant cavity 103 centres have an aperture, and microwave enters resonant cavity 104 by the antenna transmission end of microwave dividing plate and panel installed connector 102 by aperture, through resonant cavity 104 reflection Hou Yuan roads, return; Copper sheet A105, copper sheet B106 are positioned over the interior adjusting resonant cavity of resonant cavity 104 size.
Described co-axial cable component 101 operating frequency ranges should be corresponding with resonant cavity 104 resonance frequencys, and its loss, standing wave, mechanical phase stability should meet test request; Co-axial cable component 101 connectors adopt male, can with the female connector of panel installed connector 102, directly be connected with the microwave dividing plate.
The operating frequency of described microwave dividing plate and panel installed connector 102 should be able to meet the resonance frequency that comprises resonant cavity 104.
Described resonant cavity 104 is shaped as the hollow bottomed cylindrical shape, and centre hollows out a cuboid, forms resonant cavity, and surrounding can be circular-arc; There is support on both sides, and available screw B108 is fixed in the test desired location; On another dual-side, screw is arranged upward, cover plate of resonant cavity 103 can be fixed thereon; Make the material selection red copper, electroplate.
Described copper sheet A105 and copper sheet B106 size are corresponding with resonant cavity 104, can just in time vertically be placed on resonant cavity 104 interior to regulate the size of its resonant cavity, thereby the resonance frequency of regulating resonant cavity 104 realize the measurement under the different frequency microwave.
Described screw A107 and screw B108 adopt copper screw.
The invention has the advantages that: the present invention has utilized the skin effect of microwave, thereby solved traditional electricity, transports the interference that while testing, sample body electricity is led, and adopts contactless, non-destructive method to be measured, and method is simple and convenient, can directly be measured sample.The impact of microwave heating on the sample test result while having avoided test under microwave in the past, realize utilizing microwave to carry out the original position research of electricity transport property and spin properties, for transport research such as two-dimensional nanostructure material surface state magnetic such as topological insulators, provide a kind of effective tool.
The accompanying drawing explanation
Fig. 1: reflective 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 reflective resonator.In figure, each several part is: resonant cavity 104, copper sheet A105, copper sheet B106, screw A107.
Embodiment
Below according to summary of the invention and accompanying drawing, explanation provides an example preferably of the present invention, in conjunction with example, further illustrates the technology of the present invention details, architectural feature and functional characteristics.But this example does not limit the scope of the invention, conforming with the example of describing in summary of the invention and accompanying drawing explanation all should comprise within the scope of the present invention.
Microwave dividing plate and panel installed connector 102 adopt the 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 the red copper material, outside silver-plated anti-oxidation.
The long 25mm of cover plate of resonant cavity 103, wide 21mm, thickness is 3mm, and two screws are respectively arranged on minor face, fixing by screw A107 and resonant cavity 104, cover plate of resonant cavity 103 centres have 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 the outer circle diameter is 31mm, and the first half is for stretching out support, and long 30mm, for fixing and test place by resonant cavity 104; Inside hollows out and forms a rectangle resonant cavity, and length and width are all 20mm, dark 9.5mm, and for easy to process, four jiaos of quadrants that a diameter 3mm is respectively arranged.Cover plate of resonant cavity 103, copper sheet A105 and copper sheet B106 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, by adjusting its size, change its resonance frequency.The minimum resonance frequency of resonant cavity is:
(a>b>c, a, b, c are three length of sides of rectangular cavity), 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 the M1.6*4 screw, for fixing of cover plate of resonant cavity 103 and resonant cavity 104; Screw B108 adopts the M2.5*4 screw, for resonant cavity 104 is fixed in to the test desired location.
In reflective resonant cavity method of measurement, microwave transmission process co-axial cable component 101, microwave dividing plate and panel installed connector 102 are by aperture on cover plate of resonant cavity 103, be applied in resonant cavity 104, the measuring-signal Yan Yuan road of gained is returned, and detect its signal power size by wave detector, draw the resonant cavity resonance curve, thereby obtain its quality factor.Can obtain in chamber the sample surfaces state with the variation relation in magnetic field under varying magnetic field.
Claims (6)
1. one kind for measuring the reflective resonant cavity of sample surfaces state under the 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), it 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, hole in the middle of microwave dividing plate and panel installed connector (102) lower end antenna alignment cover plate of resonant cavity (103), and use screw B(108) fixing; On two trisection points of cover plate of resonant cavity (103) minor face, a screw is respectively arranged, corresponding with resonant cavity (104) two ends screw, by screw A(107) fixing with 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, through resonant cavity (104) reflection Hou Yuan road, returns; Copper sheet A(105), copper sheet B(106) be positioned in resonant cavity (104) and regulate the resonant cavity size.
2. according to claim 1 a kind of for measuring the reflective resonant cavity of sample surfaces state under the profound hypothermia high-intensity magnetic field, 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, can with the female connector of panel installed connector (102), directly be connected with the microwave dividing plate.
3. according to claim 1 a kind of for measuring the reflective resonant cavity of sample surfaces state under the profound hypothermia high-intensity magnetic field, it 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 that comprises resonant cavity (104).
4. according to claim 1 a kind of for measuring the reflective resonant cavity of sample surfaces state under the profound hypothermia high-intensity magnetic field, it is characterized in that: described resonant cavity (104) is shaped as the hollow bottomed cylindrical shape, centre hollows out a cuboid, forms resonant cavity, and surrounding can be circular-arc; There is support on both sides, available screw B(108) be fixed in the test desired location; On another dual-side, screw is arranged upward, cover plate of resonant cavity (103) can be fixed thereon; Make the material selection red copper, electroplate.
5. according to claim 1 a kind of for measuring the reflective resonant cavity of sample surfaces state under the profound hypothermia high-intensity magnetic field, 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, thereby regulate the resonance frequency of resonant cavity (104), realize the measurement under the different frequency microwave.
6. according to claim 1 a kind of for measuring the reflective resonant cavity of sample surfaces state under the profound hypothermia high-intensity magnetic field, it is characterized in that: described screw A(107) and screw B(108) adopt copper screw.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105911029A (en) * | 2016-01-13 | 2016-08-31 | 中国科学院上海技术物理研究所 | System for measuring sample photoluminescence under deep low temperature and intense magnetic field |
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| US20070044708A1 (en) * | 2005-08-26 | 2007-03-01 | Magnetrol International, Inc. | Ultrasonic sensor assembly and method |
| 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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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070044708A1 (en) * | 2005-08-26 | 2007-03-01 | Magnetrol International, Inc. | Ultrasonic sensor assembly and method |
| 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105911029A (en) * | 2016-01-13 | 2016-08-31 | 中国科学院上海技术物理研究所 | System for measuring sample photoluminescence under deep low temperature and intense magnetic field |
| CN105911029B (en) * | 2016-01-13 | 2018-10-19 | 中国科学院上海技术物理研究所 | A kind of system for measuring sample luminescence generated by light under profound hypothermia high-intensity magnetic field |
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