CN212569096U - Magnetic imaging device based on diamond NV color center and Kerr effect - Google Patents
Magnetic imaging device based on diamond NV color center and Kerr effect Download PDFInfo
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- CN212569096U CN212569096U CN202020158509.XU CN202020158509U CN212569096U CN 212569096 U CN212569096 U CN 212569096U CN 202020158509 U CN202020158509 U CN 202020158509U CN 212569096 U CN212569096 U CN 212569096U
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Abstract
In the magnetic imaging device based on the NV color center and the Kerr effect of the diamond, a spinning control light source module provides a beam of incident laser, the incident laser passes through a dichroic mirror system and is focused by a microscope objective and then irradiates on the NV color center of a diamond probe, and fluorescence generated by the NV color center returns to the dichroic mirror system through the microscope objective and enters a fluorescence detection module; the polarized light generating module generates polarized light, the polarized light enters the microscope objective lens through transmission and/or reflection of the dichroic mirror system and then irradiates a sample placed on the displacement table, and after the polarized light is reflected by the sample, part of the polarized light enters the microscope objective lens again and then enters the polarized light detecting and imaging module through the dichroic mirror system. The utility model discloses a compatible design to the realization is to high resolution, global and the big field of vision formation of image of sample.
Description
The technical field is as follows:
the utility model belongs to the technical field of magnetic material and magnetic field measurement, concretely relates to magnetic imaging device and method based on diamond NV color center and kerr effect (magneto-optic kerr effect, kerr effect is also called for short in this application). The magnetic material can be used for magnetic imaging with high spatial resolution and overall situation on materials, and has important application value in the fields of physics, materials, electronics and industrial detection.
Background art:
the measurement of the magnetization state of the magnetic material is of great significance in physics, materials science, electronics and industrial production. In recent years, a magnetic measuring method using a nitrogen-vacancy color center (hereinafter, referred to as NV color center) in diamond has appeared. The principle is that a diamond with NV color center is used as the front end of a probe and is arranged near a sample to be tested. Under the action of a leakage magnetic field of the sample, the spin state of the NV color center is influenced by the magnetic field to generate Zeeman energy level splitting. The spins are controlled by microwaves, and after the transitions are excited by laser light, tiny magnetic field signals can be detected by observing and analyzing fluorescence data radiated from NV color centers. The sample is moved by the high-precision displacement platform, so that the surface leakage magnetic fields of different positions of the sample can be detected, and the scanning imaging of the magnetization state of the sample is realized. Due to the tiny volume and high precision of the NV color center, the method can realize magnetic imaging with the spatial resolution at the nanometer level. However, this method cannot realize global synchronous imaging, and it takes a long time to image a target having a large area by a scanning method, and thus the detection size is also small. The magneto-optical Kerr imaging technology is a technology for imaging a sample by utilizing magneto-optical Kerr effect, can perform global imaging on the sample, has a large imaging range which can reach the magnitude of hundreds of micrometers to several millimeters, but has difficulty in the resolution of magneto-optical Kerr microscope imaging being superior to 200nm due to optical diffraction and the like. Magneto-optical kerr imaging is different from NV-color-center-based imaging in principle, and the optical system and the operation method thereof are different, so that the conventional apparatus and imaging method cannot realize compatibility of the two imaging technologies.
In the prior art, although the NV-color-center-based magnetic field measurement technology has the characteristic of high spatial resolution and theoretically can reach the level of several nanometers, the magnetic field measurement technology basically realizes the imaging of the magnetization state of a magnetic sample based on single-point scanning. Not only can synchronous global imaging not be realized, but also a long time is consumed for scanning the surface of a sample with a large area; and the magneto-optical Kerr imaging can realize global time synchronization imaging, and the imaging field of view is wider and can reach hundreds of micrometers to several millimeters. But the imaging resolution is limited by optical diffraction and is generally no better than 200 nm.
Because the optical path of the imaging system based on the diamond NV color center is a confocal optical path, the configuration, the principle and the operation method of the imaging system are different from those of a magneto-optical Kerr microscopic imaging system, and two imaging technologies cannot be realized on the same optical path in a traditional mode.
The utility model has the following contents:
for solving the above-mentioned technical problem that prior art exists, the utility model provides a magnetic imaging device and imaging method based on diamond NV colour center and kerr effect through compatible design, can realize above two kinds of magnetism measuring method at same device to the realization is to high resolution, global and the big field of vision formation of image of sample. By high resolution is meant spatial imaging resolution above the resolution limit of a conventional optical microscope, i.e. resolution better than 200 nm.
In order to realize the purpose of the utility model, the following technical scheme is specifically adopted in this application.
A magnetic imaging device based on a diamond NV color center and a Kerr effect comprises a spinning control light source module 1, a polarized light generation module 2, a fluorescence detection module 3, a polarized light detection and imaging module 4, a microscope objective 5, a diamond probe 9 with an NV color center, an NV color center probe arm 10, a microwave emitting device 12 and a displacement table 13; the method is characterized in that:
the spinning control light source module 1 is used for providing a beam of incident laser, the laser is transmitted or reflected by a dichroic mirror through a dichroic mirror system, and is irradiated onto an NV color center of a diamond probe 9 after being focused by a microscope objective 5, and the diamond probe 9 with the NV color center is clamped by an NV color center probe arm 10;
the microwave transmitting device 12 is arranged close to one side of the NV color center of the diamond probe 9 and used for transmitting an electromagnetic pulse sequence and controlling the spinning state of the NV color center;
fluorescence generated by the NV color center of the diamond probe 9 returns to the dichroic mirror system through the microscope objective 5, is transmitted or reflected through the dichroic mirror system, and enters the fluorescence detection module 3;
the polarized light generating module 2 is configured to generate polarized light having linear polarization property, where the polarized light enters the microscope objective 5 through transmission or reflection of the dichroic mirror system, and then irradiates the sample 11 placed on the displacement table 13, and after the polarized light is reflected by the sample, a part of the polarized light enters the microscope objective 5 again, and then after the polarized light is transmitted or reflected by the dichroic mirror system, the polarized light enters the polarized light detecting and imaging module 4.
The utility model discloses further include following preferred technical scheme:
the dichroic mirror system comprises a first dichroic mirror 6, a second dichroic mirror 7 and a third dichroic mirror 8;
the first dichroic mirror 6, the second dichroic mirror 7 and the third dichroic mirror 8 are configured as follows:
the second dichroic mirror 7 is obliquely arranged at the intersection position of two light paths of the incident laser emitted by the spin control light source module 1 and the polarized light emitted by the polarized light generating module 2, and can transmit or reflect the incident laser, reflect or transmit the polarized light, and make the light paths of the incident laser and the polarized light after transmission or reflection by the second dichroic mirror 7 consistent;
the first dichroic mirror 6 is arranged above the microscope objective lens 5 and can receive the laser or polarized light transmitted or reflected by the second dichroic mirror 7 and reflect the laser or polarized light into the microscope objective lens 5;
third dichroic mirror 8 sets up between first dichroic mirror 6 and fluorescence detection module 3, can make the polarized light pass through after the sample reflection in proper order behind microscope objective 5, first dichroic mirror 6 and get into polarized light detection and imaging module 4 with its reflection, can make the transmission of the fluorescence of NV color center transmission pass through objective 5, first dichroic mirror 6 and third dichroic mirror 8 simultaneously, get into fluorescence detection module 3.
The spin control light source module 1 consists of a laser source 1a, optical fibers (1b, 1d), an optical modulator 1c, a first optical fiber coupler 1e and a first convex lens 1 f;
the optical modulator 1c is used to control the on/off of the light in the spin control light source module 1,
when the optical modulator 1c is an optical fiber coupling type modulator, the laser source 1a, the optical modulator 1c and the first optical fiber coupler 1e are sequentially connected in a front-back order through optical fibers, and the first convex lens 1f is arranged at the rear end of the first optical fiber coupler 1e and focuses incident laser to the dichroic mirror system;
when the optical modulator 1c is a free space optical modulator, the laser source 1a and the first optical fiber coupler 1e are connected through an optical fiber, the optical modulator 1c and the first convex lens 1f are arranged at the rear end of the first optical fiber coupler 1e, and the order of the optical modulator 1c and the first convex lens 1f can be exchanged; the modulated laser light is incident into a dichroic mirror system.
All or part of the elements of the spin control light source module 1 are placed on an adjusting frame and used for adjusting the direction of incident light, so that laser emitted by the spin control light source module 1 passes through a microscope objective 5 and then is focused on the NV color center of the diamond probe 9.
The incident laser provided by the spin control light source module 1 is a monochromatic light source, the wavelength range is 500nm-600nm, and the light source can be subjected to pulse modulation.
The polarized light generating module 2 is composed of a light source 2a, a second convex lens 2b and a polarizer 2 c;
the light source 2a may be selected from, but not limited to, an LED lamp, a mercury lamp, a xenon lamp, and light coupled out through an optical fiber; the polarizer 2c is a device which can convert unpolarized light into linearly polarized light after transmitting the element;
the light source 2a is arranged on the front side, and the positions of the second convex lens 2b and the polarizer 2c on the rear side can be exchanged; the second convex lens 2b and the polarizer 2c may be directly integrated with the light source 2a to become a linearly polarized light source.
The polarized light generating module 2 generates light with linear polarization property, and the wavelength of the light is between 300nm and 530 nm.
The fluorescence detection module 3 consists of a first filter 3a, a second optical fiber coupler 3b, an optical fiber 3c and a first photoelectric detector 3 d;
fluorescence generated by the NV color center of the diamond probe 9 enters the first filter plate 3a, then enters the first photoelectric detector 3d after being collected into the optical fiber 3c by the second optical fiber coupling module 3b, and then is converted into an electrical signal by the photoelectric detector 3 d.
The fluorescence detection module 3 consists of a second filter 3f, a diaphragm 3g and a second photoelectric detector 3 h;
the second filter 3f and the diaphragm 3g can be exchanged; after fluorescence generated by the NV color center of the diamond probe 9 enters the fluorescence detection module 3, the fluorescence just focuses on the light through hole of the diaphragm 3g and penetrates through the light through hole, the fluorescence is received by the second photoelectric detector 3h, and other interference light is shielded by the diaphragm 3 g.
The first filter 3a and the second filter 3f are filter devices with a pass band between 540nm and 1000nm, and are used for filtering light emitted by the spin control light source module 1 and reflected by the light path to enter the fluorescence detection module 3, and only allowing fluorescence emitted by the NV color center due to the change of the spin state to transmit through the filters.
All or part of the elements of the fluorescence detection module 3 are arranged on an adjusting frame and used for adjusting the position of the second optical fiber coupler 3b or the diaphragm 3g, and fluorescence emitted by the NV color center passes through the objective lens 5 and then is just focused at the entrance of the second optical fiber coupler 3b or at the small hole of the diaphragm 3g and is detected by the first photoelectric detector 3d or the second photoelectric detector 3 h.
The polarized light detection and imaging module 4 comprises an analyzer 4a and a camera 4d, and the polarization state of the light beam is detected by the analyzer 4a and imaged by the camera 4 d;
the analyzer 4a is a linear polarizer, and the analyzer 4a is, but not limited to, any one of the following:
a thin film polarizer or a glan taylor prism, or a glan thompson prism;
the optional range of the camera 4d includes, but is not limited to, a CCD camera or a CMOS camera.
The polarized light detection and imaging module 4 further comprises a plurality of filters which are arranged 1 at any position in front of the camera 4d, and the band-pass range of the filters is matched with the light source emitted by the polarized light generation module 2 and is between 300nm and 530 nm.
The polarized light detection and imaging module 4 further comprises a compensator arranged in front of the analyzer 4a, wherein the compensator is a lambda/4 compensation slide matched with the polarized light generation module 2.
The polarized light detection and imaging module 4 further comprises a third convex lens, and a third convex lens can be inserted between any optical elements in front of the camera in the polarized light detection and imaging module to adjust the position of the sample imaged after passing through the microscope objective 5.
Based on the scheme disclosed by the application, the same instrument can be used for simultaneously carrying out high-resolution imaging based on the NV color center and magneto-optical imaging based on the magneto-optical Kerr effect, and the requirements of high spatial resolution and large-field global imaging are met. Meanwhile, global characterization can be carried out on the sample by using Kerr imaging, and then high-resolution fine characterization can be carried out on a local specific area by NV color center magnetic measurement.
Description of the drawings:
fig. 1 is a schematic diagram of the overall structure of the device based on magneto-optical kerr imaging and diamond nitrogen vacancy position color center magnetic imaging and the structure diagram of each included module;
FIG. 2 is a flow chart of the method for simultaneously achieving NV color center based high resolution imaging and magneto-optical Kerr imaging;
FIG. 3 is a schematic diagram of another embodiment of the fluorescence detection module.
Wherein, the spinning control light source module 1, the polarized light generating module 2, the fluorescence detecting module 3, the polarized light detecting and imaging module 4, the microscope objective 5, the first dichroic mirror 6, the second dichroic mirror 7, the third dichroic mirror 8, the diamond probe 9 with NV color center, the NV probe arm 10, the sample 11, the microwave emitting device 12, the high-precision displacement table 13, the laser source 1a, the optical fiber 1b, the light modulator 1c, the optical fiber 1d, the first optical fiber coupler 1e, the first convex lens 1f, the light source 2a, the second convex lens 2b, the polarizer 2c, the first filter 3a, the second optical fiber coupler 3b, the optical fiber 3c, d a first photoelectric detector 3d, an analyzer 4a, a third convex lens 4b, a third filter 4c, a camera 4d, a second filter 3f, a diaphragm 3g and a second photoelectric detector 3 h.
The specific implementation mode is as follows:
the technical solution is further explained and explained in detail with reference to the drawings.
Referring to the attached drawing 1, the magneto-optical kerr imaging and diamond nitrogen vacancy position based color center magnetic imaging device disclosed by the application comprises a spin control light source module 1, a polarized light generation module 2, a fluorescence detection module 3, a polarized light detection and imaging module 4, a microscope objective 5, a diamond probe 9 with an NV color center, an NV color center probe arm 10, a microwave emitting device 12 and a displacement table 13.
The spinning control light source module 1 is used for providing a beam of incident laser, the laser is transmitted and/or reflected by a dichroic mirror through a dichroic mirror system, and is irradiated onto an NV color center of the diamond probe 9 after being focused by a microscope objective 5, and the diamond probe 9 with the NV color center is clamped by an NV color center probe arm 10; the microwave transmitting device 12 is arranged close to one side of the NV color center of the diamond probe 9 and used for transmitting an electromagnetic pulse sequence and controlling the spinning state of the NV color center; fluorescence generated by the NV color center of the diamond probe 9 returns to the dichroic mirror system through the microscope objective 5, is transmitted and/or reflected by the dichroic mirror system, and enters the fluorescence detection module 3; the polarized light generating module 2 is configured to generate polarized light having linear polarization property, where the polarized light enters the microscope objective 5 through transmission and/or reflection of the dichroic mirror system, and then irradiates the sample 11 placed on the displacement stage 13, and after the polarized light is reflected by the sample, a part of the polarized light enters the microscope objective 5 again, and then after the polarized light is transmitted and/or reflected by the dichroic mirror system, the polarized light enters the polarized light detecting and imaging module 4.
In the present application, the dichroic mirror system is preferably configured in the following manner, but it should be clear to those skilled in the art that the dichroic mirror system used in the present application is only a preferred embodiment, and is not a limitation to the configuration of the dichroic mirror system.
In a preferred embodiment of the present application, the dichroic mirror system comprises a first dichroic mirror 6, a second dichroic mirror 7, a third dichroic mirror 8;
the second dichroic mirror 7 is obliquely arranged at the intersection position of two light paths of the incident laser emitted by the spin control light source module 1 and the polarized light emitted by the polarized light generating module 2, and can transmit or reflect the incident laser, reflect or transmit the polarized light, and make the light paths of the incident laser and the polarized light after transmission or reflection by the second dichroic mirror 7 consistent;
the first dichroic mirror 6 is arranged above the microscope objective lens 5 and can receive the laser or polarized light transmitted or reflected by the second dichroic mirror 7 and reflect the laser or polarized light into the microscope objective lens 5;
third dichroic mirror 8 sets up between first dichroic mirror 6 and fluorescence detection module 3, can make the polarized light pass through after the sample reflection in proper order behind microscope objective 5, first dichroic mirror 6 and get into polarized light detection and imaging module 4 with its reflection, can make the transmission of the fluorescence of NV color center transmission pass through objective 5, first dichroic mirror 6 and third dichroic mirror 8 simultaneously, get into fluorescence detection module 3.
It is clear to ordinary skilled person in the art that all can realize the above-mentioned light path of spin control light source module 1 incident laser through projection or reflection mode, the fluorescence that the NV color center produced gets into fluorescence detection module 3 to and can make the polarized light that polarized light generation module 2 produced get into microscope objective 5, shine on sample 11, and get into any dichroic mirror system combination of polarized light detection and imaging module 4 after the transmission, the homoenergetic realizes the utility model discloses an aim at can obtain the same technological effect. For example, a person skilled in the art can also easily think of replacing the second dichroic mirror 7 and the third dichroic mirror 8 in the above embodiments with total reflection lenses, and when the total reflection lenses are used at the positions of the second dichroic mirror 7 and the third dichroic mirror 8, a mechanical device should be used to control the insertion and extraction of the two total reflection lenses, and when the two total reflection lenses are inserted, a certain function can be realized, and then the lenses are extracted, and the optical paths are switched to realize another function.
Therefore, based on the spirit of the present invention, a person skilled in the art can easily obtain the combination of various dichroic mirrors or lenses to realize two different light paths, and the combination of these dichroic mirrors or lenses is all covered by the protection scope of the present application. The spin control light source module 1 provides a path of incident light, the incident light is a monochromatic light source, the wavelength range is 500nm-600nm, and the light source can be subjected to pulse modulation. The module 1 may be composed of a laser source 1a, optical fibers (1b and 1d), an optical modulator 1c, a first fiber coupler 1e, and a first convex lens 1 f. The optical modulator is used to control the on/off of light in the module 1, and is placed between the optical fibers 1b and 1d if the optical modulator is an optical fiber coupling type modulator, or is placed at the rear end of the first optical fiber coupler 1e if the optical modulator is a free space optical modulator.
In addition, the spin manipulation light source module 1 may be further configured as follows: a collimated laser light source and a free space spatial light modulator. All or part of the spin control light source module 1 may be disposed on an adjusting frame for adjusting the direction of incident light, so that the spin control light passes through the objective lens 5 and then focuses on the NV color center.
The polarized light generating module 2 is composed of a light source 2a, a second convex lens 2b and a polarizer 2 c. The light source 2a may be selected from, but not limited to, an LED lamp, a mercury lamp, a xenon lamp, light coupled out through an optical fiber, and the like; the polarizer 2c is a device which can convert unpolarized light into linearly polarized light after transmitting the element; so that the positions of the convex lens 2b and the polarizer 2c can be reversed. The polarized light generated by the polarized light generating module 2 has a wavelength of 300nm-530 nm.
The fluorescence detection module 3 is composed of a first filter 3a, a second fiber coupler 3b, an optical fiber 3c and a first photoelectric detector 3 d.
Fluorescence generated by the NV color center of the diamond probe 9 enters the first filter plate 3a, is collected into the optical fiber 3c by the second optical fiber coupler 3b, enters the first photoelectric detector 3d, and is converted into an electrical signal by the photoelectric detector 3 d.
The first filter 3a is a filter device with a passband between 540nm and 1000nm, and has the function of filtering light emitted by the spin control light source module 1 and the module and reflected by the light path to enter the fluorescence detection module 3, and only allowing fluorescence emitted by the NV color center due to the change of the spin state to transmit through the filter. The fluorescence is collected into the optical fiber 3c by the second optical fiber coupler 3b, and then enters the first photodetector 3 d. The first photodetector 3d is a device capable of converting an optical signal into an electrical signal, such as a photodiode and a camera. All or part of the elements of the fluorescence detection module 3 can be arranged on the adjusting frame and used for adjusting the position of the optical coupler, and fluorescence emitted by the NV color center is focused on the optical coupler right after passing through the objective lens 5 and enters the optical fiber 3c so as to be detected by the first photoelectric detector 3 d.
As shown in fig. 3, in another preferred embodiment of the present application, the fluorescence detection module 3 may further include a second filter 3f, a diaphragm 3g, and a second photodetector 3 h;
the second filter 3f and the diaphragm 3g can be exchanged; after fluorescence generated by the NV color center of the diamond probe 9 enters the fluorescence detection module 3, the fluorescence just focuses on the light through hole of the diaphragm 3g and penetrates through the light through hole, the fluorescence is received by the second photoelectric detector 3h, and other interference light is shielded by the diaphragm 3 g.
Similarly, the second filter 3f is a filter with a passband between 540nm and 1000nm, and is configured to filter light emitted by the spin control light source module 1 and reflected by the light path to enter the fluorescence detection module 3, and only allow fluorescence emitted by the NV color center due to the change of the spin state to transmit through the filter. All or part of the elements of the fluorescence detection module 3 are arranged on the adjusting frame and used for adjusting the position of the diaphragm 3g, and fluorescence emitted by the NV color center just focuses on the small hole of the diaphragm 3g after passing through the objective lens 5 and is detected by the second photoelectric detector 3 h.
The polarized light detecting and imaging device 4 is configured as an analyzer 4a, a third convex lens 4b (optional), a third filter 4c (optional), and a camera 4 d. The analyzer 4a is a linear polarizer, and can be a thin film polarizer or a Glan Taylor prism or a Glan Topson prism; the optional range of the camera 4d includes, but is not limited to, a CCD camera or a CMOS camera. The band-pass range of the third filter 4c is matched with the light source emitted by the polarized light generation module and is between 300nm and 530 nm. The third convex lens 4b can adjust the position of the sample imaged after passing through the objective lens, so that the imaging focus of the sample just falls on the camera photosensitive chip, and a clear Kerr picture is obtained. In addition, a compensator can be added before the analyzer 4a, and the compensator refers to a λ/4 compensation slide with the wavelength λ matched with the module 2.
As shown in fig. 2, the magnetic imaging apparatus based on the NV color center and the kerr effect of diamond can realize global magnetic imaging, which specifically includes the following contents:
a light source of the polarized light generation module 2 is turned on, the light source becomes polarized light after being focused and polarized by a convex lens, the polarized light enters a microscope objective 5 after being reflected or transmitted by a dichroic mirror system, and then the polarized light irradiates a sample 11 placed on a displacement table 13;
the sample 11 is positioned in the focal area of the objective lens by adjusting the movement of the displacement table 13;
after the polarized light is reflected by the sample 11, part of the polarized light enters the microscope objective 5 again, and then enters the polarized light detection and imaging module 4 after being transmitted or reflected by the dichroic mirror system;
rotating the polarizer 4a in the polarized light detection and imaging module to make the included angle between the polarization direction of the polarizer 4a and the polarization direction of the polarizer 2c in the polarized light generation module 2 between 80 degrees and 100 degrees;
the polarization analyzer 4a in the polarized light detection and imaging module detects the polarization state of the light beam and images by the camera 4d, and the pictures obtained by the camera can obtain the magnetization state information of the surface of the sample, namely, magneto-optical Kerr imaging is realized.
Similarly, referring to fig. 2, based on the foregoing magnetic imaging device based on the NV color center and the kerr effect of diamond, high-resolution magnetic imaging can be realized, and the specific process is as follows:
the direction of the laser emitted by the spin control light source module 1 is adjusted, so that the laser is reflected or transmitted into the microscope objective 5 through the dichroic mirror system, and is focused by the microscope objective 5 and then irradiates onto the NV color center. Initializing NV color center electron spin through laser irradiation emitted by the spin control light source module 1;
stopping laser, transmitting an electromagnetic pulse sequence through the microwave transmitting device 12, and controlling the spinning state of the NV color center;
selecting an electromagnetic pulse sequence, so that the frequency of the electromagnetic pulse is coherent with the energy difference between spins S-0 and S-1, or the energy difference between spins S-0 and S-1, and the pulse duration is half of the Larre oscillation period of the electron spin, namely pi/2 pulse; the selected electromagnetic pulse sequence is a Ramsey sequence;
after the electromagnetic pulse emission is finished, allowing NV color center electrons to freely evolve for a set time tau; in the present application, the set time τ is less than the NV centroid electron self-transverse spin relaxation time.
Inputting an electromagnetic pulse with the duration of pi/2;
after the re-emitted electromagnetic pulse is finished, the spin control light source module 1 inputs an incident laser again to enable the incident laser to be focused on the NV color center, and the NV color center generates fluorescence;
part of the fluorescence returns to the dichroic mirror system through the microscope objective 5, and then enters the fluorescence detection module 3 through the transmission or reflection of the dichroic mirror system; analyzing a fluorescence signal received by the photoelectric detector to calculate the size of a magnetic field at the NV color center of the diamond;
then, the sample is stepped by controlling the movement of the displacement table in the horizontal direction, and the size of the stray magnetic field at a certain height above different areas of the sample is measured by repeating the above measurement steps, so as to obtain the magnetic distribution imaging of the sample. The method utilizes the color of nitrogen vacancy in the diamond to carry out magnetic imaging, and the spatial resolution can reach the sub-nanometer level.
When the magneto-optical Kerr imaging and diamond nitrogen vacancy color center magnetic imaging device based on the magneto-optical Kerr imaging and diamond nitrogen vacancy color center magnetic imaging device disclosed by the application is used for testing, if the magneto-optical Kerr imaging and diamond nitrogen vacancy color center magnetic imaging device comprises a spin control light source module 1, a polarized light generation module 2, a fluorescence detection module 3, a polarized light detection and imaging module 4, a microscope objective 5, a dichroic mirror 6, a dichroic mirror 7, a dichroic mirror 8 and the like, after the spin control light source module 1, the polarized light generation module 2, the fluorescence detection module 3 and the polarized light detection and imaging module 4 are all opened, high-resolution imaging and magneto-optical Kerr imaging based on a diamond NV color center can be carried out simultaneously. At this time, a filter with a passband of 540nm to 1000nm needs to be configured in the fluorescence detection module 3 to filter out other interference light; and a filter with the passband wavelength smaller than 530nm is configured in the polarized light detection and imaging module 4 to filter an interference light source, so that the polarized light reflected by the sample 11 enters a camera for imaging.
If the magneto-optical Kerr imaging and diamond nitrogen vacancy color center magnetic imaging device comprises a spin control light source module 1, a polarized light generation module 2, a fluorescence detection module 3, a polarized light detection and imaging module 4, a microscope objective lens 5, a dichroic mirror 6, a total reflection mirror 7, a total reflection mirror 8 and the like, after the spin control light source module 1, the polarized light generation module 2, the fluorescence detection module 3 and the polarized light detection and imaging module 4 are all started, high-resolution imaging and magneto-optical Kerr imaging based on the diamond NV color center need to be sequentially carried out in batches. That is, when the high resolution imaging based on the diamond NV color center is performed, the light path switching is performed by inserting the total reflection mirror 7 and the total reflection mirror 8 into the light path or moving the total reflection mirror out of the light path, so that the light from the spin control light source module 1 enters the objective lens, and the fluorescence emitted from the NV color center is received by the fluorescence detection module 3; when magneto-optical Kerr imaging is carried out, the full-reflection mirror 7 and the full-reflection mirror 8 are required to be inserted into the optical path or removed from the optical path for optical path switching, so that the polarized light generation module 2 and the polarized light detection and imaging module 4 are connected into the optical path for magneto-optical Kerr imaging.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents of the embodiments of the invention may be made without departing from the spirit and scope of the invention, which should be construed as falling within the scope of the claims of the invention.
Claims (10)
1. A magnetic imaging device based on diamond NV color center and Kerr effect comprises a spinning control light source module (1), a polarized light generation module (2), a fluorescence detection module (3), a polarized light detection and imaging module (4), a microscope objective (5), a diamond probe (9) with the NV color center, an NV color center probe arm (10), a microwave emitting device (12) and a displacement table (13); the method is characterized in that:
the spinning control light source module (1) is used for providing a beam of incident laser, the laser is transmitted or reflected by a dichroic mirror through a dichroic mirror system, and is focused by a microscope objective lens (5) and then irradiates an NV color center of a diamond probe (9), and the diamond probe (9) with the NV color center is clamped by an NV color center probe arm (10);
the microwave transmitting device (12) is arranged close to one side of the NV color center of the diamond probe (9) and used for transmitting an electromagnetic pulse sequence and controlling the spinning state of the NV color center;
fluorescence generated by the NV color center of the diamond probe (9) returns to the dichroic mirror system through the microscope objective lens (5), is transmitted or reflected through the dichroic mirror system, and enters the fluorescence detection module (3);
the polarized light generating module (2) is used for generating light with linear polarization property, namely polarized light, the polarized light enters the microscope objective lens (5) through transmission or reflection of the dichroic mirror system and then irradiates a sample (11) placed on the displacement table (13), after the polarized light is reflected by the sample, part of the polarized light enters the microscope objective lens (5) again, and after the polarized light is transmitted or reflected by the dichroic mirror system, the polarized light enters the polarized light detecting and imaging module (4).
2. A diamond NV colour centre and kerr effect based magnetic imaging device according to claim 1, wherein:
the dichroic mirror system comprises a first dichroic mirror (6), a second dichroic mirror (7) and a third dichroic mirror (8);
the first dichroic mirror (6), the second dichroic mirror (7) and the third dichroic mirror (8) are configured in the following way:
the second dichroic mirror (7) is obliquely arranged at the intersection position of two light paths of incident laser emitted by the spin control light source module (1) and polarized light emitted by the polarized light generation module (2), can transmit or reflect the incident laser, reflect or transmit the polarized light, and enables the light paths of the incident laser and the polarized light after being transmitted or reflected by the second dichroic mirror (7) to be consistent;
the first dichroic mirror (6) is arranged above the microscope objective lens (5) and can receive the laser or polarized light transmitted or reflected by the second dichroic mirror (7) and reflect the laser or polarized light into the microscope objective lens (5);
third dichroic mirror (8) set up between first dichroic mirror (6) and fluorescence detection module (3), can make the polarized light pass through after the sample reflection in proper order through microscope objective (5), first dichroic mirror (6) after get into polarized light detection and imaging module (4) with its reflection, the transmission that simultaneously can make the fluorescence of NV color center transmission pass through microscope objective (5), first dichroic mirror (6) and third dichroic mirror (8), get into fluorescence detection module (3).
3. A diamond NV colour centre and kerr effect based magnetic imaging device according to claim 2, wherein:
the spinning control light source module (1) is composed of a laser source (1a), optical fibers (1b, 1d), an optical modulator (1c), a first optical fiber coupler (1e) and a first convex lens (1 f);
the incident laser provided by the spin control light source module (1) is a monochromatic light source, and the wavelength range is 500-600 nm;
when the optical modulator (1c) is an optical fiber coupling type modulator, the laser source (1a), the optical modulator (1c) and the first optical fiber coupler (1e) are sequentially connected through optical fibers in a front-back order, and the first convex lens (1f) is arranged at the rear end of the first optical fiber coupler (1e) and focuses incident laser to the dichroic mirror system;
when the optical modulator (1c) is a free space optical modulator, the laser source (1a) and the first optical fiber coupler (1e) are connected through optical fibers, the optical modulator (1c) and the first convex lens (1f) are arranged at the rear end of the first optical fiber coupler (1e), and the sequence of the optical modulator (1c) and the first convex lens (1f) can be exchanged; the modulated laser light is incident into a dichroic mirror system.
4. A diamond NV color center and Kerr effect based magnetic imaging device according to claim 3, wherein:
and placing all or part of elements of the spin control light source module (1) on an adjusting frame for adjusting the direction of incident light, so that laser emitted by the spin control light source module (1) passes through a microscope objective lens (5) and then is focused on the NV color center of the diamond probe (9).
5. A diamond NV colour centre and kerr effect based magnetic imaging device according to any one of claims 1-3, wherein:
the polarized light generation module (2) is composed of a light source (2a), a second convex lens (2b) and a polarizer (2c), and the polarized light generation module (2) generates light with linear polarization property, the wavelength of which is 300-530 nm;
wherein, the light source (2a) comprises but is not limited to LED lamp, mercury lamp, xenon lamp, light output by optical fiber coupling;
the light source (2a) is arranged on the front side, and the positions of the second convex lens (2b) and the polarizer (2c) on the rear side can be reversed; the second convex lens (2b) and the polarizer (2c) can also be directly integrated with the light source (2a) to become a linearly polarized light source.
6. A diamond NV colour centre and kerr effect based magnetic imaging device according to claim 1, wherein:
the fluorescence detection module (3) is composed of a first filter (3a), a second optical fiber coupler (3b), an optical fiber (3c) and a first photoelectric detector (3 d);
fluorescence generated by the NV color center of the diamond probe (9) enters a first filter plate (3a), is collected into an optical fiber (3c) by a second optical fiber coupler (3b), enters a first photoelectric detector (3d), and is converted into an electrical signal by the first photoelectric detector (3 d);
wherein the passband of the first filter (3a) is between 540nm and 1000 nm.
7. A diamond NV colour centre and kerr effect based magnetic imaging device according to claim 1, wherein:
the fluorescence detection module (3) consists of a second filter, a diaphragm (3g) and a second photoelectric detector (3 h);
wherein, the second filter (3f) and the diaphragm (3g) can be exchanged; after fluorescence generated by the NV color center of the diamond probe (9) enters the fluorescence detection module (3), the fluorescence is just focused on the light through hole of the diaphragm (3g) and penetrates through the light through hole, the fluorescence is received by the second photoelectric detector (3h), and other interference light is shielded by the diaphragm (3 g);
wherein the passband of the second filter (3f) is between 540nm and 1000 nm.
8. A diamond NV colour centre and Kerr effect based magnetic imaging device according to claim 6 or 7, wherein:
all or part of elements of the fluorescence detection module (3) are arranged on an adjusting frame and used for adjusting the position of the second optical fiber coupler (3b) or the diaphragm (3g), and fluorescence emitted by the NV color center is focused just at the entrance of the second optical fiber coupler (3b) or at the small hole of the diaphragm (3g) after passing through the objective lens (5) and is detected by the first photoelectric detector (3d) or the second photoelectric detector (3 h).
9. A diamond NV colour centre and kerr effect based magnetic imaging device according to any one of claims 1-3, wherein:
the polarized light detection and imaging module (4) comprises an analyzer (4a) and a camera (4d), and the polarization state of the light beam is detected through the analyzer (4a) and imaged by the camera (4 d);
the analyzer (4a) is a linear polarizer, and the analyzer (4a) is any one of the following, but is not limited to:
a thin film polarizer, a glan taylor prism, or a glan thompson prism;
the camera (4d) includes, but is not limited to, a CCD camera or a CMOS camera.
10. A diamond NV colour centre and kerr effect based magnetic imaging apparatus according to claim 9, wherein:
the polarized light detection and imaging module (4) further comprises 1 to a plurality of third filters (4c), a compensator and a third convex lens (4 b);
1 to a plurality of third filters (4c) are arranged at any position in front of the camera (4d), and the band-pass range of the third filters (4c) is matched with the light source emitted by the polarized light generation module (2) and is between 300nm and 530 nm;
a compensator arranged in front of the analyzer (4a), wherein the compensator is a lambda/4 compensation slide matched with the polarized light generation module (2);
a third convex lens (4b) is inserted between any optical elements in front of the camera (4d) to adjust the position of the sample imaged after passing through the microscope objective (5).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113219387A (en) * | 2021-05-28 | 2021-08-06 | 国网安徽省电力有限公司电力科学研究院 | Solid-state quantum spin fluorescence imaging system |
| CN114609558A (en) * | 2022-05-12 | 2022-06-10 | 之江实验室 | All-fiber NV color center sensing magnetic measurement system and method with stable and modulatable power |
| CN114813670A (en) * | 2022-04-06 | 2022-07-29 | 仪晟科学仪器(嘉兴)有限公司 | Low-temperature diamond nitrogen vacancy color center optical microscope |
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2020
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113219387A (en) * | 2021-05-28 | 2021-08-06 | 国网安徽省电力有限公司电力科学研究院 | Solid-state quantum spin fluorescence imaging system |
| CN114813670A (en) * | 2022-04-06 | 2022-07-29 | 仪晟科学仪器(嘉兴)有限公司 | Low-temperature diamond nitrogen vacancy color center optical microscope |
| CN114813670B (en) * | 2022-04-06 | 2023-07-07 | 仪晟科学仪器(嘉兴)有限公司 | Low-temperature diamond nitrogen vacancy color center optical microscope |
| CN114609558A (en) * | 2022-05-12 | 2022-06-10 | 之江实验室 | All-fiber NV color center sensing magnetic measurement system and method with stable and modulatable power |
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