CN110618156A - Superconducting detection device based on diamond NV color center - Google Patents
Superconducting detection device based on diamond NV color center Download PDFInfo
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- CN110618156A CN110618156A CN201910896638.0A CN201910896638A CN110618156A CN 110618156 A CN110618156 A CN 110618156A CN 201910896638 A CN201910896638 A CN 201910896638A CN 110618156 A CN110618156 A CN 110618156A
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- diamond
- color center
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- focusing lens
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N24/00—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects
- G01N24/006—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects using optical pumping
Abstract
The invention discloses a superconducting detection device based on a diamond NV color center, and belongs to the technical field of superconducting detection. The structure is as follows: the device comprises a first diamond NV color center (1), a second diamond NV color center (2), a focusing lens (3), a first reflecting mirror (4), a filtering lens (5), a collimating lens (6), a spectrometer (7), a photoelectric detector (8), a signal collector (9), a microwave generator (10), a power amplifier (11), a copper wire (12), quartz glass (13), a magnetic field generating device (14), a second reflecting mirror (15), a beam expanding lens (16) and a laser (17). The invention simplifies the coil device required by the traditional detection of the Meissner effect, and has simple structure, higher sensitivity and stronger operability.
Description
Technical Field
The invention belongs to the technical field of superconducting detection, and particularly relates to a superconducting detection device based on a diamond NV color center.
Background
With the continuous progress of high-voltage and low-temperature technologies, people are approaching the ultimate goal of room-temperature superconductivity. The superconducting material and the superconducting technology have wide application prospects and application values in various aspects such as national defense, scientific research, industry, human life and the like, and the realization of room-temperature superconducting can greatly promote the innovation of a series of new technologies represented by ultra-high-speed computers and data transmission. Therefore, higher requirements are also put forward for scientific research sensibility and technical means of superconducting detection of scientific research practitioners. Superconducting and superconducting materials remain a hot point of research in condensed state physics for a very long time.
The diamond NV color center is used as an element with high sensitivity, and has extremely high application value in the fields of micro-displacement measurement, biological living body imaging, quantum computation, weak magnetic field detection, superconducting detection extending to the field, and the like. At present, the preparation technology of diamond NV color center is mature, but the experimental means for realizing superconducting detection based on the substance is only mentioned.
In the known energy level of the NV colour centre of diamond, its ground state3A2Is rotated by electrons msThe triplet degenerated state consisting of 0 and ± 1 energy levels. When electrons are emitted from3E excited state is de-excited to3A2In the ground state, a photon having an energy E of 1.945eV is radiated, and fluorescence having a wavelength λ of 637nm is emitted.
Introducing a microwave field with the frequency range of 2.5-3 GHz into the NV color center of the diamond under the laser irradiation with the wavelength of 532nm, wherein the frequency m is about 2.87GHzsMagnetic dipole oscillations are formed between the 0 and + -1 th order energy levels, and during the process of the electrons being de-excited from the excited state to the ground state, some energy is released in the form of non-radiative transitions, resulting in a lower fluorescence intensity at this time compared to when no microwave field is introduced. Thus forming a shape corresponding to msThe photo-detection magnetic resonance of the diamond NV colour centre, i.e. + -. 1 electron spin resonance absorption peak.
Disclosure of Invention
In view of this, the invention provides a device for realizing superconducting detection based on a diamond NV color center, which realizes the purpose of superconducting detection by acquiring and recording fluorescence and ODMR spectrum signals of the device.
The technical scheme of the invention is as follows:
a superconductive detection device based on diamond NV color center has the structure that: the device comprises a focusing lens 3, a first reflector 4, a filter lens 5, a collimating lens 6, a spectrometer 7, a photoelectric detector 8, a signal collector 9, a microwave generator 10, a power amplifier 11, a copper wire 12, quartz glass 13, a magnetic field generating device 14, a second reflector 15, a beam expanding lens 16 and a laser 17; the diamond color center cutting method is characterized in that the structure also comprises a first diamond NV color center 1 and a second diamond NV color center 2;
the beam expanding lens 16, the second reflecting mirror 15, the first reflecting mirror 4 and the focusing lens 3 are sequentially arranged along the light path of light emitted by the laser 17, the first reflecting mirror 4 and the second reflecting mirror 15 are kept parallel, the first diamond NV color center 1 and the second diamond NV color center 2 are positioned on the focal plane of the focusing lens 3, any one diamond NV color center can be positioned on the focal point of the focusing lens 3 by moving the quartz glass 13, and the focusing lens 3, the filter lens 5, the collimating lens 6, the spectrometer 7, the photoelectric detector 8 and the output end of the photoelectric detector 8 are sequentially arranged on the light path formed after the incident light of the focusing lens 3 is reflected by the diamond NV color center positioned on the focal point, and the input end of the signal collector 9; the output end of the microwave generator 10 is connected with the input end of the power amplifier 11, one end of the copper wire 12 is connected with the output end of the power amplifier 11, the other end of the copper wire is grounded, the copper wire 14 is attached to the quartz glass 13, the gap between the first diamond NV color center 1 and the second diamond NV color center 2 is at least 10mm and is fixed on the quartz glass 13 to be in contact with the copper wire 14, and the magnetic field generating device 14 is placed in parallel with the quartz glass 13.
One of the characteristic signs usually accompanied with the occurrence of the superconducting phenomenon is the meissner effect, which means that after the superconducting phenomenon occurs, the magnetic flux in the sample is completely discharged out of the body, the magnetic induction intensity is constant to zero, and the meissner effect is also called complete diamagnetism. Theoretically, a diamond NV color center can detect a 0.1 μ T magnetic field change. When the device is used for superconducting detection, the superconducting material is placed beside a diamond NV color center, and the change of a magnetic field near the superconducting material when the superconducting phenomenon occurs is detected by the diamond NV color center, so that the superconducting detection is realized.
Has the advantages that:
1. the coil device required by the traditional detection of the Maillard effect is simplified, and the structure is simple.
2. Compared with the prior art, the method has higher detection sensitivity and stronger operability.
Description of the drawings:
FIG. 1 is a block diagram of an apparatus for performing superconducting measurements based on diamond NV color centers.
FIG. 2 is an ODMR spectrum of diamond NV color centers at zero magnetic field.
FIG. 3 is an ODMR spectrum of a diamond NV color center under certain magnetic field conditions.
FIG. 4 is a mutation reflected in the ODMR spectrum of the NV color center of the diamond in the presence of superconductivity.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
Example 1 general structure of the invention
The structure of the diamond NV color center-based superconducting detection device is shown in FIG. 1, and specifically comprises a first diamond NV color center 1, a second diamond NV color center 2, a focusing lens 3, a first reflector 4, a filter lens 5, a collimating lens 6, a spectrometer 7, a photoelectric detector 8, a signal collector 9, a microwave generator 10, a power amplifier 11, a copper wire 12, quartz glass 13, a magnetic field generation device 14, a second reflector 15, a beam expanding lens 16 and a laser 17.
The beam expanding lens 16, the second reflecting mirror 15, the first reflecting mirror 4 and the focusing lens 3 are sequentially arranged along the optical path of light emitted by the laser 17 to realize the generation, transmission and focusing of laser, the first reflecting mirror 4 and the second reflecting mirror 15 are kept parallel, and the first reflecting mirror 4 is removed or the mirror is inverted before the fluorescence signal of the diamond NV color center is collected so as not to block the optical path of the fluorescence signal.
The first diamond NV color center 1 and the second diamond NV color center 2 are fixed on quartz glass 13 and located on a focal plane of a focusing lens 3, a gap between the first diamond NV color center 1 and the second diamond NV color center 2 is larger than or equal to 10mm, any one diamond NV color center can be located on a focal point of the focusing lens 3 by moving the quartz glass 13, the focusing lens 3, a filter lens 5, a collimating lens 6, a spectrometer 7 and a photoelectric detector 8 are sequentially arranged on a light path formed by reflecting light incident from the focusing lens 3 by the diamond NV color center located on the focal point, and the device is used for generating and transmitting fluorescence. The input end of the signal collector 9 is connected with the output end of the photoelectric detector 8 and is used for collecting fluorescence and ODMR spectra.
The output of the microwave generator 10 is connected to the input of the power amplifier 11, one end of an SMA port connecting wire is connected to the output of the power amplifier 11, the other end is cut off to expose the shielding layer and the wire core, the wire core is welded to one end of the copper wire 14 by soldering tin, the shielding layer (equivalent to electrical ground) is welded to the other end of the copper wire 14, and a layer of black glue is coated on each joint until the black glue is completely hardened. A copper wire 14 is fixed on a quartz glass 13 and is in contact with both the first diamond NV colour centre 1 and the second diamond NV colour centre 2, and the above devices constitute an ODMR spectrum generating device.
The magnetic field generating device 14 is placed in parallel with the quartz glass 13. The magnetic field generator is used for generating a magnetic field, and the position of the magnetic field generator is not changed after the magnetic field value is set in the working process of the system.
Example 2 superconducting testing procedure Using the invention
Placing a sample to be detected at a first diamond NV color center 1, starting a laser 17 and a microwave generator 10, adjusting quartz glass 13 to enable the first diamond NV color center 1 and a second diamond NV color center 2 to be located at a focus of a focusing lens 3 in sequence, enabling laser generated by the laser 17 to enter the first diamond NV color center 1 through a beam expanding lens 16, a second reflecting mirror 15, a first reflecting mirror 4 and the focusing lens 3, enabling fluorescence emitted by the first diamond NV color center 1 to enter a spectrometer 7 through the focusing lens 3, a filter lens 5 and a collimating lens 6 in sequence, converting the fluorescence into an electric signal by a photoelectric detector 8, completing signal acquisition by a signal acquisition unit 9, and enabling an ODMR spectrum of a zero magnetic field acquired by LabVIEW based on the fluorescence of the diamond NV color center to be as shown in figure 2. Due to msMagnetic dipole oscillation between the 0 and + -1 orders of energy occurs, so that the oscillation corresponding to m occurss1 electron ═ 1Spin resonance absorption peak. The magnetic field generating device 14 is activated and the ODMR spectrum under magnetic field conditions is shown in fig. 3. M under magnetic field conditions due to the Zeeman effectsThe electron of ± 1 is further cleaved. Starting a low-temperature controller of a sample to be tested, gradually reducing the temperature, and when the temperature is reduced to the critical temperature of the superconducting material, comparing with the ODMR spectrum of the NV color center 2 of the second diamond, the ODMR spectrum is shown in figure 4, the spectrogram at the NV color center 1 of the first diamond where the superconducting material is placed has obvious attenuation or enhancement of an absorption peak, namely mutation, the sample to be tested is proved to have the superconducting phenomenon according to the relative position of the NV color center of the diamond relative to the superconductor. Wherein the NV centre of the diamond on which the superconductor material is not placed is taken as a reference standard.
The above is an implementation of the measurement method, but the present invention is not limited thereto. Any simple changes and modifications based on the method to solve the same problems or technical effects are within the protection scope of the present invention.
Claims (2)
1. A superconductive detection device based on diamond NV color center has the structure that: the device comprises a focusing lens (3), a first reflector (4), a filter lens (5), a collimating lens (6), a spectrometer (7), a photoelectric detector (8), a signal collector (9), a microwave generator (10), a power amplifier (11), a copper wire (12), quartz glass (13), a magnetic field generating device (14), a second reflector (15), a beam expanding lens (16) and a laser (17); the diamond color center is characterized in that the structure also comprises a first diamond NV color center (1) and a second diamond NV color center (2);
wherein the beam expanding lens (16), the second reflecting mirror (15), the first reflecting mirror (4) and the focusing lens (3) are sequentially arranged along the optical path of light emitted by the laser (17), the first reflecting mirror (4) and the second reflecting mirror (15) are kept parallel, the first diamond NV color center (1) and the second diamond NV color center (2) are positioned on the focal plane of the focusing lens (3), any one diamond NV color center can be positioned on the focus of the focusing lens (3) by moving the quartz glass (13), and the focusing lens (3), the filter lens (5), the collimating lens (6), the spectrometer (7), the photoelectric detector (8) and the output end of the photoelectric detector (8) are sequentially arranged on a light path formed after the incident light of the focusing lens (3) is reflected by the diamond NV color center positioned on the focus and connected with the input end of the signal collector (9); the output end of the microwave generator (10) is connected with the input end of the power amplifier (11), one end of the copper wire (12) is connected with the output end of the power amplifier (11), the other end of the copper wire is grounded, the copper wire (14) is attached to the quartz glass (13), the gap between the first diamond NV color center (1) and the second diamond NV color center (2) is at least 10mm and is fixed on the quartz glass (13) to be in contact with the copper wire (14), and the magnetic field generating device (14) is placed in parallel with the quartz glass (13).
2. A diamond NV colour centre based superconducting detection device according to claim 1, wherein the first mirror (4) and the second mirror (15) are both at 45 degrees to the incident light.
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| CN201910896638.0A CN110618156A (en) | 2019-09-20 | 2019-09-20 | Superconducting detection device based on diamond NV color center |
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| CN201910896638.0A CN110618156A (en) | 2019-09-20 | 2019-09-20 | Superconducting detection device based on diamond NV color center |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112617797A (en) * | 2020-12-30 | 2021-04-09 | 上海联影医疗科技股份有限公司 | Physiological signal detection method applied to magnetic resonance imaging and electronic device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009073740A2 (en) * | 2007-12-03 | 2009-06-11 | President And Fellows Of Harvard College | Spin based magnetometer |
| US20150192532A1 (en) * | 2014-01-08 | 2015-07-09 | Massachusetts Institute Of Technology | Methods and apparatus for optically detecting magnetic resonance |
| CN109632861A (en) * | 2019-01-29 | 2019-04-16 | 中国科学技术大学 | A kind of high pressure magnetic resonance detection device |
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- 2019-09-20 CN CN201910896638.0A patent/CN110618156A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009073740A2 (en) * | 2007-12-03 | 2009-06-11 | President And Fellows Of Harvard College | Spin based magnetometer |
| US20150192532A1 (en) * | 2014-01-08 | 2015-07-09 | Massachusetts Institute Of Technology | Methods and apparatus for optically detecting magnetic resonance |
| CN109632861A (en) * | 2019-01-29 | 2019-04-16 | 中国科学技术大学 | A kind of high pressure magnetic resonance detection device |
Non-Patent Citations (1)
| Title |
|---|
| BOUCHARD ET AL.: "Detection of the Meissner effect with a diamond magnetometer", 《NEW JOURNAL OF PHYSICS》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112617797A (en) * | 2020-12-30 | 2021-04-09 | 上海联影医疗科技股份有限公司 | Physiological signal detection method applied to magnetic resonance imaging and electronic device |
| CN112617797B (en) * | 2020-12-30 | 2023-08-08 | 上海联影医疗科技股份有限公司 | Physiological signal detection method applied to magnetic resonance imaging and electronic device |
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