Magnetic-field measurement device and manufacturing method thereof as well as magnetic-field measurement method

Abstract

The embodiment of the invention discloses a magnetic-field measurement device and a manufacturing method thereof as well as a magnetic-field measurement method. The magnetic-field measurement device comprises a combined optical fiber, monocrystal diamond particles, a microwave transmission line, a microwave generator, a laser device and a spectrometer, wherein the combined optical fiber is prepared by connecting two optical fibers; the monocrystal diamond particles are packaged between the end faces of the two optical fibers and provided with single NV colour centers; the microwave transmission line is arranged at the external wall of the combined optical fiber; the microwave generator is connected with the microwave transmission line; the laser device is connected with one end of the combined optical fiber; and the spectrometer is connected with the other end of the combined optical fiber; and exciting lights are input from one end of the combined optical fiber, and fluorescent lights of single NV colour centers are received from the other end of the combined optical fiber. In the invention, through carrying out measurement on magnetic fields by using the single NV colour centerspackaged in the optical fiber, the application of a confocal microscope system is avoided, the cost for finding the single NV colour centers is reduced, and the time and manpower are saved; and meanwhile, the magnetic-field measurement can be conveniently performed by using the single NV colour centers in any magnetic-field environment without being limited by the confocal microscope system.

Description

technical field [0001] The invention relates to magnetic field measurement technology, in particular to a magnetic field measurement device, a manufacturing method thereof, and a magnetic field measurement method. Background technique [0002] In diamond crystals, there is an impurity defect in which N atoms replace C atoms. When this impurity defect is adjacent to a C atom vacancy, an NV color center is formed. A single NV color center has a special electronic structure and optical transition properties, and has potentially important applications in the fields of magnetic field measurement and magnetic imaging. [0003] The NV color center will emit fluorescence when it is excited by light of a suitable wavelength. The fluorescence wavelength of the NV color center is 600-800nm, and there will be a luminescence peak of zero phonon line at 637nm. The fluorescence intensity of the NV color center will be affected by the external microwave and magnetic field. The magnetic fie...

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Problems solved by technology

[0009] 1) The confocal microscopy system requires the best microscopic imaging system and nanoscale scanning system, so it will inevitably lead to high costs;

[0010] 2) It takes a lot of time and manpower to find and locate a single NV color center, so in the process of using a single NV color center to measure the magnetic field, it will inevitably consume a lot of time and manpower to find and locate a single NV color center;

[0011] 3) Since the focus of the confocal microscope system will drift due to various external factors such as temperature and interference, the positioning of a single NV color center will be unstable, thereby affecting the accuracy of magnetic field measurement;

[0012] 4) Confocal microscopy can only be used to study one NV color center at the same time. A confocal microscope system can only correspond to one or a group of color centers. Once the color center is replaced, it is difficult to find the original color center. ;

[0013] 5) The single NV color center found by confocal microscopy cannot be used without the confocal microscopy system, and the confocal microscopy system is not easy to transplant to external field systems such as low temperature, magnetic field and electric field, which inevitably limits the use of Development of Magnetic Field Measurement Technology for Single NV Color Center

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