CN113219381A - Light path system of diamond film magnetic imaging device - Google Patents
Light path system of diamond film magnetic imaging device Download PDFInfo
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- CN113219381A CN113219381A CN202110464203.6A CN202110464203A CN113219381A CN 113219381 A CN113219381 A CN 113219381A CN 202110464203 A CN202110464203 A CN 202110464203A CN 113219381 A CN113219381 A CN 113219381A
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- 229910003460 diamond Inorganic materials 0.000 title claims abstract description 58
- 239000010432 diamond Substances 0.000 title claims abstract description 58
- 238000003384 imaging method Methods 0.000 title claims abstract description 31
- 230000003287 optical effect Effects 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 11
- 230000008569 process Effects 0.000 claims abstract description 7
- 239000013307 optical fiber Substances 0.000 abstract description 3
- 239000010408 film Substances 0.000 description 32
- 238000005516 engineering process Methods 0.000 description 8
- 238000005259 measurement Methods 0.000 description 5
- 239000000523 sample Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000005284 excitation Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000002465 magnetic force microscopy Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000026058 directional locomotion Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005686 electrostatic field Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005305 interferometry Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000386 microscopy Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000000387 optically detected magnetic resonance Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000004583 scanning Hall probe microscopy Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000005418 spin wave Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/032—Measuring direction or magnitude of magnetic fields or magnetic flux using magneto-optic devices, e.g. Faraday or Cotton-Mouton effect
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Measuring Magnetic Variables (AREA)
Abstract
An optical path system of a diamond film magnetic imaging device. The laser comprises a laser and a computer, wherein 532nm green laser emitted by the laser is expanded by a convex lens to form parallel laser, and then acts on an NV color center of a diamond film through a bicolor sheet; the magnetic block applies a magnetic field to the NV color center of the diamond film, and fluorescence generated after the NV color center of the diamond film is excited passes through the bicolor sheet and the filter sheet and is collected by the CCD camera; the computer regulates and controls the microwave device to generate microwaves, and the microwaves are transmitted through the microwave antenna to act on the NV color center of the diamond film; the phase-locked amplifier collects the output signal of the microwave device and the output signal of the CCD camera; the lock-in amplifier processes the signal and transmits the signal to the computer. The diamond magnetic imaging sensor has the advantages that the diamond is used as a main sensing component, the surface of an optical fiber slice of the diamond magnetic imaging sensor is plated with a reflecting film, the rapid scanning magnetic imaging of a sample in a narrow space and a centimeter magnitude can be realized, and the imaging resolution ratio of a micrometer scale is kept at room temperature.
Description
Technical Field
The invention relates to a diamond film magnetic imaging device, in particular to an optical path system of the diamond film magnetic imaging device.
Background
With the development of society and the advancement of science and technology, the development and application of magnetic field measurement technology are receiving more and more attention. The discovery of some new physical effects and the breakthrough of new technology greatly improve the performance of the magnetic field measuring device. The current major methods for magnetic field measurement on a micro scale include a series of methods such as superconducting quantum interferometry, scanning hall probe microscopy, Magnetic Force Microscopy (MFM), magnetic resonance microscopy (MRFM), and the like. Theoretical spatial and magnetic field resolution limitations exceed the previously mentioned techniques, but their inherent operation under ambient conditions and low external magnetic fields are excellent leaders.
Furthermore, an NV color center magnetic measurement technology and a scanning imaging technology are combined, a local magnetic field vector is extracted by detecting resonance transitions in the directions of four symmetry axes of a fixed NV tetrahedron, and the NV color center in the diamond is used for imaging a magnetic field around a magnetic structure. The diamond probe containing the NV color center can scan a sample point by point through an AFM system, the magnetic field size information of the surface of the sample is obtained quantitatively, and a two-dimensional image of a local magnetic field vector is constructed. And can be measured in external fields of less than 50G and at ambient conditions.
Recent studies of diamond NV colour centres open up infinite possibilities in the field of quantum sensing, and early experiments using NV centres as a proximity magnetometer showed promising results. However, in the magnetic detection technology and the process of establishing the light path, how to excite the large-area diamond NV color center, improve the excitation efficiency of the system, and scan the magnetic field in a large range, so that the realization of the fast and high-sensitivity magnetic field imaging is still a problem.
Disclosure of Invention
In order to solve the defects that the rapid and high-sensitivity magnetic field imaging cannot be realized in the existing magnetic detection technology and the process of establishing a light path, the invention provides a light path system of a diamond film magnetic imaging device.
The technical scheme adopted by the invention for solving the technical problems is as follows: an optical path system of a diamond film magnetic imaging device comprises a laser and a computer, wherein 532nm green laser emitted by the laser is expanded by a convex lens to form parallel laser, and then acts on an NV color center of a diamond film through a bicolor sheet; the magnetic block applies a magnetic field to the NV color center of the diamond film, and fluorescence generated after the NV color center of the diamond film is excited passes through the bicolor sheet and the filter sheet and is collected by the CCD camera.
The computer regulates and controls the microwave device to generate microwaves, and the microwaves are transmitted through the microwave antenna to act on the NV color center of the diamond film.
The phase-locked amplifier collects a reference signal and an input signal, wherein the reference signal is an output signal of the microwave device, and the input signal is an output signal of the CCD camera; the phase-locked amplifier processes the reference signal and the input signal and then transmits the processed signals to the computer.
Further, the microwave antenna is wound on the surface of the diamond film.
Further, the diamond film has the length and width of 100-10 cm and the thickness of 10-200 μm.
The invention has the advantages that the design is reasonable, the diamond is used as a main sensing component, the surface of the optical fiber slice is plated with the reflecting film, the rapid scanning magnetic imaging of a sample with a small space and a centimeter magnitude can be realized, and the imaging resolution ratio of a micrometer scale is kept at room temperature.
Drawings
Fig. 1 is a schematic view of an optical path system of the present invention.
FIG. 2 is a schematic diagram showing the construction of an optical path system of the diamond thin film magnetic imaging device of the present invention.
In the figure: 1. the laser comprises a laser, 2 parts of a convex lens, 3 parts of a bicolor sheet, 4 parts of a diamond film, 5 parts of a magnetic block, 6 parts of a microwave antenna, 7 parts of a microwave device, 8 parts of a filter, 9 parts of a CCD camera, 10 parts of a phase-locked amplifier and 11 parts of a computer.
Detailed Description
The invention is further illustrated by the following figures and examples. However, it should be understood by those skilled in the art that the present invention is not limited to the specific embodiments listed, and should be included within the scope of the present invention as long as the spirit of the present invention is met.
See figures 1, 2. The optical path system of the diamond film magnetic imaging device comprises a laser 1, a convex lens 2, a bicolor sheet 3, a diamond film 4, a magnetic block 5, a microwave antenna 6, a microwave 7, a filter 8, a CCD camera 9, a lock-in amplifier 10 and a computer 11, wherein the laser 1 emits 532nm green laser, the green laser is expanded by the convex lens 2 to form parallel laser, and the parallel laser acts on an NV color center of the diamond film 4 through the bicolor sheet 3; the magnetic block 5 applies a magnetic field on the NV color center of the diamond film 4; fluorescence generated after the NV color center of the diamond film 4 is excited passes through the bicolor plate 3 and the filter plate 8 and is collected by the CCD camera 9.
The phase-locked amplifier 10 collects a reference signal and an input signal, wherein the reference signal is an output signal of the microwave device 7, and the input signal is an output signal of the CCD camera 9; the lock-in amplifier 10 processes the reference signal and the input signal and transmits the processed signals to the computer 11.
The computer 11 regulates the microwave 7 to generate microwave and transmits the microwave through the microwave antenna 6 to act on the NV color center of the diamond film 4.
Further, the microwave antenna 6 is wound on the surface of the diamond film 4.
Further, the magnetic field applied by the magnetic block 5 is a bias magnetic field, and zeeman splitting is generated by the action of the bias magnetic field on the NV color centers in the four axial directions, so that the magnitude of the magnetic field in each axial direction is measured.
Preferably, the diamond film 4 has a length and a width of 100 to 10cm and a thickness of 10 to 200 μm.
The working principle of the optical path system of the diamond film magnetic imaging device is that,
firstly, 532nm green laser emitted by a laser 1 is expanded by a convex lens 2;
then, the light after beam expansion is changed into a uniform light field by using a light field calibration system, and the light field intensity can be adjusted according to the NV color center concentration in the diamond film 4;
then, the green excitation light is irradiated on the diamond film 4 through the dichroic filter 3, the diamond film 4 is completely positioned in a light field, red fluorescence is emitted under the excitation of green light with the NV color center, the emission of the fluorescence is non-directional, but a part of the fluorescence returns to the dichroic filter 3 in the original way and is transmitted into a fluorescence collecting part, the fluorescence at the moment contains the green excitation light, the green light can be filtered by utilizing an optical band-pass filter 8, the fluorescence emitted by the NV color center is left, and the fluorescence emitted by the NV color center is received by a CCD camera 9; the CCD basic constitution unit is MOS capacitor, it takes electric charge as signal, through applying clock pulse signal to metal electrode, forms the potential well storing the current carrier in the semiconductor, when the light or electricity is injected, the current carrier representing the signal is introduced into the potential well, and then the law change of the clock pulse is utilized to make the potential well under the electrode change correspondingly, so that the current carrier representing the input signal can make directional movement on the semiconductor surface, and then through the collection and amplification of the electric charge, the signal is taken out.
In the working of the optical path system, the emitted fluorescence of the diamond NV color center can change along with the change of an external magnetic field under the combined action of laser and microwave, if an uneven magnetic field exists within the field of view of the diamond film 4, uneven fluorescence variation is displayed in the CCD camera 9, because the microwave system can realize the regulation and control of the spin state of the color center, the microwave field is indispensable in the process of acquiring the NV color center ESR signal, and when the microwave source generates the frequency-modulated microwave, the output radio frequency signal is used as a reference signal of the lock-in amplifier, the modulated microwave signal modulates the fluorescence radiated by the NV color center, the fluorescence emitted by the NV color center is received by the CCD camera 9 to send out an electric signal, and used as the input signal of the lock-in amplifier, then the microwave frequency is scanned and the output signal is recorded, thus obtaining the ODMR spectrum.
The light path system of the diamond film magnetic imaging device firstly expands the beam of the laser, and then vertically irradiates the parallel laser of a large beam on the diamond film to excite the whole diamond film, thereby realizing the magnetic field measurement of the whole area. The sensor based on the diamond film has a large sensing area, and fluorescence emitted by the color center is detected by the CCD after being excited by a uniform optical field, so that magnetic field scanning can be carried out on a detection area, and finally high-sensitivity magnetic imaging is realized.
The optical path system of the diamond film magnetic imaging device has the following characteristics:
1. the diamond is used as a main sensing component, and a reflecting film is plated on the surface of an optical fiber slice of the diamond, so that the rapid scanning magnetic imaging of a sample in a narrow space and a centimeter magnitude can be realized, and the imaging resolution ratio of a micrometer scale is kept at room temperature;
2. spin waves can be measured by using the method for measuring the alternating field by using the NV color center, and local magnetic material microwave response research can be possibly carried out by combining with a scanning imaging technology;
3. NV color center imaging has the potential of simultaneously scanning and imaging various information, and electrostatic field scanning is possible by exerting the capability of NV color center measuring electric field;
4. the NV color center concentration and the spin property in the diamond are optimized, and the measurement sensitivity at different environmental temperatures is obviously improved.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims.
Claims (3)
1. An optical path system of a diamond film magnetic imaging device comprises a laser and a computer, and is characterized in that: the laser emits 532nm green laser, the green laser is expanded by a convex lens to form parallel laser, and the parallel laser acts on an NV color center of the diamond film through a bicolor sheet; the magnetic block applies a magnetic field to the NV color center of the diamond film, and fluorescence generated after the NV color center of the diamond film is excited passes through the bicolor sheet and the filter sheet and is collected by the CCD camera;
the computer regulates and controls the microwave device to generate microwaves, and the microwaves are transmitted through the microwave antenna to act on the NV color center of the diamond film;
the phase-locked amplifier collects a reference signal and an input signal, wherein the reference signal is an output signal of the microwave device, and the input signal is an output signal of the CCD camera; the phase-locked amplifier processes the reference signal and the input signal and then transmits the processed signals to the computer.
2. The optical path system of a diamond film magnetic imaging device according to claim 1, wherein: the microwave antenna is wound on the surface of the diamond film.
3. The optical path system of a diamond film magnetic imaging device according to claim 1, wherein: the diamond film has the size, the length and the width of 100 mu m-10 cm and the thickness of 10-200 mu m.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110464203.6A CN113219381A (en) | 2021-04-28 | 2021-04-28 | Light path system of diamond film magnetic imaging device |
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| CN202110464203.6A CN113219381A (en) | 2021-04-28 | 2021-04-28 | Light path system of diamond film magnetic imaging device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114114096A (en) * | 2021-11-30 | 2022-03-01 | 哈尔滨工业大学 | Microwave-free diamond NV color center magnetometer based on magnetic flux collector |
| CN115791740A (en) * | 2023-02-08 | 2023-03-14 | 安徽省国盛量子科技有限公司 | Microwave reflection imaging detection device and method based on diamond NV color center |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102539404A (en) * | 2012-01-05 | 2012-07-04 | 厦门大学 | Directional emission fluorescence imaging detection device |
| CN108519564A (en) * | 2018-03-20 | 2018-09-11 | 中北大学 | The three axis solid-state atom Magnetic Sensors based on diamond NV colour centers and magnetic field detection method |
-
2021
- 2021-04-28 CN CN202110464203.6A patent/CN113219381A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102539404A (en) * | 2012-01-05 | 2012-07-04 | 厦门大学 | Directional emission fluorescence imaging detection device |
| CN108519564A (en) * | 2018-03-20 | 2018-09-11 | 中北大学 | The three axis solid-state atom Magnetic Sensors based on diamond NV colour centers and magnetic field detection method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114114096A (en) * | 2021-11-30 | 2022-03-01 | 哈尔滨工业大学 | Microwave-free diamond NV color center magnetometer based on magnetic flux collector |
| CN114114096B (en) * | 2021-11-30 | 2024-03-26 | 哈尔滨工业大学 | Microwave-free diamond NV color center magnetometer based on magnetic flux collector |
| CN115791740A (en) * | 2023-02-08 | 2023-03-14 | 安徽省国盛量子科技有限公司 | Microwave reflection imaging detection device and method based on diamond NV color center |
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Application publication date: 20210806 |