Integrated magnetometer device based on nitrogen-vacancy color centers of diamond

Abstract

The application discloses a kind of integrated magnetometer devices based on diamond nitrogen vacancy color center.The integrated magnetometer device includes laser light source system, microwave generating device, photoelectric detection device and diamond unit with nitrogen vacancy color center, the packaging shell of the laser light source system is provided with light hole, the light hole is used to pass through the laser beam generated by the laser module in the packaging shell, the microwave generating device, the photoelectric detection device, the diamond unit are all installed on the outer surface of the packaging shell, the diamond unit is used to simultaneously receive the laser beam and the microwave emitted by the microwave generating device, and the photoelectric detection device is used to detect the fluorescence excited by the diamond unit.The scheme realizes the integration of light source, microwave source and detection module, and obtains a small-sized, portable magnetometer device.

Description

Technical Field

[0001] This invention belongs to the field of solid-state atomic magnetometer technology, specifically, it relates to an integrated magnetometer device based on diamond nitrogen vacancy color centers. Background Technology

[0002] Weak magnetic field detection has important applications in materials science, life sciences, and engineering. In recent years, with the development of quantum technology, magnetometers based on diamond nitrogen-vacancy (NV) centers have been increasingly applied in the field of magnetic field measurement. NV centers are special point defects within diamond, possessing a stable structure. Under laser irradiation and microwave radiation, the electron spin of diamond NV centers can be initialized, manipulated, and measured. NV center-based magnetometers primarily rely on photodetector magnetic resonance (PDMR) technology. By changing the applied microwave frequency and recording the fluorescence intensity of the center, a relationship between fluorescence intensity and microwave frequency—the PDMR spectrum—is obtained. When the applied microwave frequency resonates with the electronic state transition frequency, the fluorescence intensity of the center decreases, resulting in a trough in the PDMR spectrum. When the applied external magnetic field changes, the position of the electronic state resonance frequency also changes due to the Zeeman effect. The magnitude of the applied external magnetic field can be calculated from the frequency shift. Therefore, NV center-based magnetometers can be realized and have enormous application potential.

[0003] Most magnetometers based on diamond NV centers are concentrated on experimental platforms, and there is no mature solution to achieve miniaturization of magnetometers, making them unportable. Summary of the Invention

[0004] (I) The technical problem to be solved by the present invention

[0005] The technical problem solved by this invention is: how to provide a portable, miniaturized integrated magnetometer device based on diamond nitrogen vacancy color centers.

[0006] (II) Technical Solution Adopted in this Invention

[0007] An integrated magnetometer based on nitrogen-vacancy centers in diamond is disclosed. The integrated magnetometer includes a laser source system, a microwave generator, a photoelectric detection device, and a diamond unit with nitrogen-vacancy centers. The laser source system has a light-transmitting hole on its encapsulation housing for passing a laser beam generated by a laser module inside the encapsulation housing. The microwave generator, the photoelectric detection device, and the diamond unit are all mounted on the outer surface of the encapsulation housing. The diamond unit is used to simultaneously receive the laser beam and the microwaves emitted by the microwave generator. The photoelectric detection device is used to detect the fluorescence excited by the diamond unit.

[0008] Preferably, the microwave generating device includes a control circuit board, a microwave chip, and a spiral inductor. The control circuit board, the microwave chip, and the spiral inductor are all electrically connected to the control circuit board, and the spiral inductor is used to radiate microwaves.

[0009] Preferably, the spiral inductor is located above the light-passing hole, the diamond unit is disposed on the spiral inductor, and a light guide hole is formed on the spiral inductor for the laser beam to pass through.

[0010] Preferably, the diamond unit is disposed on the spiral inductor, a portion of the edge of the diamond unit extends beyond the spiral inductor, and the portion of the edge is located above the light-transmitting hole.

[0011] Preferably, the photoelectric detection device includes a plurality of first photodetectors, the first photodetectors being fixed to the outer surface of the encapsulation housing, and the plurality of photodetectors being distributed above and to the side of the diamond unit for detecting fluorescence emitted from the top and side surfaces of the diamond unit.

[0012] Preferably, the photoelectric detection device includes a first photodetector and a plurality of prisms. The first photodetector is mounted on the outer surface of the encapsulation housing and located above the diamond unit. The plurality of prisms are located on the side of the diamond unit and are used to refract the fluorescence emitted from the side of the diamond unit onto the first photodetector above.

[0013] Preferably, the photoelectric detection device further includes a first filter, which is installed between the first photodetector and the diamond unit. The first filter is used to block the laser beam from entering the first photodetector, and the wavelength of the laser beam is λ1. The first photodetector is used to detect the fluorescence emitted from the diamond unit, and the wavelength of the fluorescence is λ2.

[0014] Preferably, the photoelectric detection device further includes a second photodetector, a second filter, and an attenuator. The second photodetector is fixed to the outer surface of the encapsulation housing and located above the light-transmitting hole. The second photodetector is used to detect the laser beam. The attenuator is used to attenuate the high-energy laser beam. The second filter is used to block the fluorescence excited by the diamond unit. The wavelength of the laser beam is λ1, and the wavelength of the fluorescence is λ2.

[0015] Preferably, the encapsulation housing is a non-magnetic housing, and the integrated magnetometer device further includes a heat sink, which is installed at the bottom of the encapsulation housing.

[0016] (III) Beneficial Effects

[0017] This invention discloses an integrated magnetometer device based on diamond nitrogen-vacancy color centers, which has the following technical advantages compared to the prior art:

[0018] The laser module is installed inside the packaged housing, and the microwave generating device and photoelectric detection device are installed on the outer surface of the packaged housing, thereby integrating the light source, microwave source and detection module to obtain a miniaturized and portable magnetometer device. Attached Figure Description

[0019] Figure 1 This is a cross-sectional schematic diagram of an integrated magnetometer device based on diamond nitrogen vacancies according to Embodiment 1 of the present invention.

[0020] Figure 2 This is a three-dimensional structural diagram of the packaging shell according to Embodiment 1 of the present invention;

[0021] Figure 3 This is a schematic diagram of the first structural assembly of the photoelectric detection device according to Embodiment 1 of the present invention.

[0022] Figure 4 This is a schematic diagram of the second structural assembly of the photoelectric detection device according to Embodiment 1 of the present invention;

[0023] Figure 5 This is a schematic diagram of the third structural assembly of the photoelectric detection device according to Embodiment 1 of the present invention. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0025] Before describing the various embodiments of this application in detail, the inventive concept of this application is first briefly described: Most of the existing magnetometers based on diamond NV centers are concentrated on experimental platforms and are not portable. Therefore, this solution provides an integrated magnetometer device based on diamond nitrogen vacancy centers. The laser module is installed inside the packaged housing, and the microwave generating device and photoelectric detection device are installed on the outer surface of the packaged housing, realizing the integration of the light source, microwave source and detection module, and obtaining a miniaturized and portable magnetometer device.

[0026] Specifically, such as Figure 1 and Figure 2As shown in the figure, this embodiment discloses an integrated magnetometer device based on nitrogen vacancies in diamond. The integrated magnetometer device includes a laser source system, a microwave generating device 30, a photoelectric detection device 40, and a diamond unit 50 with nitrogen vacancy color centers. The laser source system includes a housing 10 and a laser module. The laser module is installed inside the housing 10. A light-transmitting hole 11 is provided on the housing 10 for the laser beam generated by the laser module to pass through. The microwave generating device 30, the photoelectric detection device 40, and the diamond unit 50 are all installed on the outer surface of the housing 10. The diamond unit 50 is used to simultaneously receive the laser beam and the microwave emitted by the microwave generating device 30. The photoelectric detection device 40 is used to detect the fluorescence excited by the diamond unit 50.

[0027] For example, the laser module includes a laser 21, a thermally conductive temperature control component 22, a shaping lens 23, a total reflection prism 24, and an electrode 25. The laser 21 is mounted on the thermally conductive temperature control component 22, and the electrode 25 is electrically connected to the laser 21, with a portion of the electrode 25 extending beyond the sidewall of the encapsulation housing 10. The laser beam generated by the laser 21 passes sequentially through the shaping lens 23, the total reflection prism 24, and the light-transmitting aperture 11. Further, the encapsulation housing 10 is a non-magnetic housing, and the integrated magnetometer device also includes a heat sink 60, which is mounted on the bottom of the encapsulation housing 10. This improves the heat dissipation capacity of the encapsulation housing 10, which is beneficial for ensuring the normal operation of the laser module. It also miniaturizes the laser source, resulting in a smaller diameter and higher spot power of the shaped laser beam. Additionally, a mounting portion 12 is provided on the outer sidewall of the encapsulation housing 10, facilitating the mounting of the encapsulation housing 10 to other devices.

[0028] Specifically, the microwave generating device 30 includes a control circuit board 31, a microwave chip 32, and a spiral inductor 33. The control circuit board 31, microwave chip 32, and spiral inductor 33 are all electrically connected to the control circuit board 31, and the spiral inductor 33 is used to radiate microwaves. Exemplarily, the microwave generating device 30 also includes a support frame 34, which is fixed to the outer surface of the packaging housing 10. The control circuit board 31, microwave chip 32, and spiral inductor 33 are all mounted on the support frame 34. This chip-based microwave source significantly reduces size and achieves integration.

[0029] For example, a diamond unit 50 is disposed on a spiral inductor 33, with a portion of its edge extending beyond the spiral inductor 33 and located above the light-transmitting aperture 11. The spiral inductor 33 is located at the edge of the light-transmitting aperture 11. When the diamond unit 50 is placed on the spiral inductor 33, its side extends beyond the spiral inductor 33, allowing a laser beam emitted from the light-transmitting aperture 11 to irradiate the side of the diamond unit 50, i.e., its edge. The spiral inductor 33 radiates microwaves from the bottom of the diamond unit 50, enabling the diamond to simultaneously receive both laser light and microwaves.

[0030] In another embodiment, the spiral inductor 33 is located above the light-transmitting aperture 11, and the diamond unit 50 is disposed on the spiral inductor 33. A light guide aperture is formed on the spiral inductor 33 for the passage of a laser beam. The spiral inductor 33 is mounted directly above the light-transmitting aperture 11. When the diamond unit 50 is disposed on the spiral inductor 33, both the laser beam and the microwaves generated by the spiral inductor 33 enter from the bottom of the diamond unit 50, allowing the diamond unit 50 to simultaneously receive both laser light and microwaves.

[0031] Furthermore, such as Figure 3 As shown, the photoelectric detection device 40 includes a plurality of first photodetectors 41, which are fixed to the outer surface of the encapsulation housing 10. The photodetectors 41 are distributed above and to the sides of the diamond unit 50 to detect fluorescence emitted from the top and side surfaces of the diamond unit 50. By providing multiple first photodetectors 41, the fluorescence collection capability of the photoelectric detection device 40 is improved. Each first photodetector 41 has a bracket, which is welded to the outer surface of the encapsulation housing 10. The brackets of adjacent first photodetectors 41 can be welded together for fixation.

[0032] In another embodiment, such as Figure 4 As shown, the photoelectric detection device 40 includes a first photodetector 41 and several prisms 42. The first photodetector 41 is mounted on the outer surface of the encapsulation housing 10 and located above the diamond unit 50. The several prisms 42 are located on the sides of the diamond unit 50. The prisms 42 are used to refract the fluorescence emitted from the sides of the diamond unit 50 onto the first photodetector 41 above. The fluorescence collection capability of the photoelectric detection device 40 is improved by the refraction function of the prisms 42.

[0033] Furthermore, the photoelectric detection device 40 also includes a first filter 43, which is installed between the first photodetector 41 and the diamond unit 50. The first filter 43 is used to block the laser beam from entering the first photodetector 41. The wavelength of the laser beam is λ1, and the wavelength of the fluorescence is λ2. This ensures the detection accuracy of the first photodetector 41 for fluorescence.

[0034] Furthermore, such as Figure 5 As shown, the photoelectric detection device 40 also includes a second photodetector 44, a second filter 45, and an attenuator 46. The second photodetector 44 is fixed to the outer surface of the encapsulation housing 10 and located above the light-transmitting hole 11, and below the first photodetector 41. The second photodetector 44 is used to detect the laser beam, the second filter 45 is used to block the fluorescence excited by the diamond unit 50, and the attenuator 46 is used to attenuate the high-energy laser beam. By using the second photodetector 44 to receive the laser beam, the stability of the laser can be monitored in real time.

[0035] The integrated magnetometer device based on diamond nitrogen-vacancy color centers provided in this embodiment integrates a laser light source, a microwave device, and a detection device to form a miniaturized and portable magnetometer device.

[0036] The specific embodiments of the present invention have been described in detail above. Although some embodiments have been shown and described, those skilled in the art should understand that modifications and improvements can be made to these embodiments without departing from the principles and spirit of the present invention as defined by the claims and their equivalents, and such modifications and improvements should also be within the protection scope of the present invention.

Claims

1. An integrated magnetometer device based on diamond nitrogen-vacancy color centers, characterized in that, The integrated magnetometer device includes a laser source system, a microwave generating device, a photoelectric detection device, and a diamond unit with nitrogen-vacancy color centers. The laser source system has a light-transmitting hole in its encapsulation housing for passing a laser beam generated by a laser module within the housing. The microwave generating device, the photoelectric detection device, and the diamond unit are all mounted on the outer surface of the housing. The diamond unit simultaneously receives the laser beam and microwaves emitted by the microwave generating device. The photoelectric detection device detects the fluorescence excited by the diamond unit. The wave generating device includes a control circuit board, a microwave chip, and a spiral inductor. The control circuit board, the microwave chip, and the spiral inductor are all electrically connected to the control circuit board. The spiral inductor is used to radiate microwaves. The spiral inductor is located above the light-transmitting hole. A diamond unit is disposed on the spiral inductor, and a light guide hole is formed on the spiral inductor for the laser beam to pass through. Alternatively, the diamond unit is disposed on the spiral inductor, with a portion of its edge extending beyond the spiral inductor and located above the light-transmitting hole.

2. The integrated magnetometer device according to claim 1, characterized in that, The photoelectric detection device includes a plurality of first photodetectors, which are fixed to the outer surface of the encapsulation housing, and the plurality of photodetectors are distributed above and to the side of the diamond unit to detect fluorescence emitted from the top and side surfaces of the diamond unit.

3. The integrated magnetometer device according to claim 1, characterized in that, The photoelectric detection device includes a first photodetector and several prisms. The first photodetector is mounted on the outer surface of the encapsulation housing and located above the diamond unit. The several prisms are located on the side of the diamond unit and are used to refract the fluorescence emitted from the side of the diamond unit onto the first photodetector above.

4. The integrated magnetometer device according to claim 2 or 3, characterized in that, The photoelectric detection device further includes a first filter, which is installed between the first photodetector and the diamond unit. The first filter is used to block the laser beam from entering the first photodetector, and the wavelength of the laser beam is... The first photodetector is used to detect fluorescence emitted from the diamond unit, the fluorescence having a wavelength of [wavelength missing]. .

5. The integrated magnetometer device according to claim 2 or 3, characterized in that, The photoelectric detection device further includes a second photodetector, a second filter, and an attenuator. The second photodetector is fixed to the outer surface of the encapsulation housing and located above the light-transmitting hole. The second photodetector is used to detect the laser beam. The attenuator is used to attenuate the high-energy laser beam. The second filter is used to block the fluorescence excited by the diamond unit. The wavelength of the laser beam is... The wavelength of the fluorescence .

6. The integrated magnetometer device according to claim 1, characterized in that, The encapsulation housing is a non-magnetic housing, and the integrated magnetometer device also includes a heat sink, which is installed at the bottom of the encapsulation housing.

Images