167 results about "Colour centre" patented technology

The invention relates to the technical field of robot control, and discloses a heterogeneous robot control system with intelligent and multi-modal perceptual driving, comprising: a quantum clock reference module used for generating a globally synchronized picosecond-level time reference signal and synchronizing a multi-modal sensor clock through a microwave pulse; the multi-mode sensing module comprises an event camera of which the dynamic range is greater than or equal to 120dB, a six-dimensional force sensor of which the noise density is less than or equal to 0.01 N / Hz and an inertial measurement unit of which the zero-bias stability is less than or equal to 0.8 degree / h; and the random differential manifold module adopts a four-layer full-connection neural network, and an input layer receives multi-modal data. According to the invention, a diamond NV color center system of the quantum clock reference module and a microwave pulse coupling technical scheme are adopted, so that a picosecond-level global signal synchronization effect is achieved. Compared with a scheme depending on a traditional crystal oscillator or a GPS clock in the prior art, the defects that electromagnetic interference is prone to occurring and signal jitter is large are overcome, and high-precision time sequence alignment of multi-module cooperation is ensured.

The invention discloses a detection method of an ocean magnetic field sensor based on a diamond NV color center. The detection method comprises the following steps: S1, calibrating a base line; s2, alternately measuring fluorescence between two single quantum resonance frequencies, and obtaining a difference to realize DQ reading; s3, three-axis compensation current is adjusted based on closed-loop control, and the NV working point is maintained at zero magnetization bias; s4, obtaining background magnetic field change through digital demodulation and adaptive filtering; and S5, calculating a gradient based on the spatial difference of the multi-point light spots, judging the existence and trajectory of the underwater vehicle in combination with a threshold value and a spectrum matching method, calibrating the threshold value according to the magnetic field characteristics of the existing underwater vehicle, adopting short-time Fourier transform signal spectrum, comparing the threshold value with known submarine characteristic spectrum data, and prompting if the similarity exceeds a set threshold value. According to the detection method, the measurement precision and the anti-interference capability can be improved, and the method is suitable for real-time monitoring of weak magnetic anomalies (such as magnetic moment disturbance of an underwater vehicle).

The invention discloses an underwater magnetic field measuring device based on a diamond NV color center. The underwater magnetic field measuring device comprises a diamond NV color center module, an incident laser excitation module, a multi-path optical coupling module, a microwave excitation module, a fluorescence acquisition and photoelectric conversion module, a signal processing and control module and a magnetic field module, the multi-path optical coupling module is used for dividing an optical fiber into multiple paths and collecting fluorescence generated by the diamond block; the microwave excitation module is used for switching between two single-quantum resonance frequencies to drive an NV color center to realize double-quantum DQ reading; and the signal processing and control module comprises an FPGA (Field Programmable Gate Array) processing unit of a field programmable logic array chip. According to the invention, a dual-quantum DQ working point of a diamond NV color center is used as a measurement channel, common-mode influence of D is removed through differential measurement, the problem of D drift caused by temperature drift, stress and material aging is physically and obviously inhibited, and the device can still realize ultrahigh-sensitivity measurement in a complex underwater environment.

The invention discloses a quantum magnetometer device based on a diamond nitrogen-vacancy color center. The quantum magnetometer device comprises a laser emission unit used for generating a 532nm laser beam based on a laser trigger signal; the beam shaping unit is used for focusing the laser beam to the diamond sample; the diamond sample comprises an NV color center array with specific depth on the surface or in the diamond sample, and electrons in NV color centers are excited based on laser beams to transition and generate fluorescence; the fluorescence collection unit is used for separating exciting light from 650-800nm fluorescence signals and converting the fluorescence signals into multi-channel electric signals; the microwave radiation unit is distributed around a diamond sample space and emits three independently regulated microwave frequencies at the same time; and the control and processing unit is used for receiving and processing the multi-channel electric signals in real time and analyzing magnetic field parameters based on the optical detection magnetic resonance spectral line. Synchronous measurement of a three-dimensional magnetic field is realized, and the limitation of single-axis measurement of a traditional NV magnetometer is broken through.

The present invention discloses a flow type fluorescence detection system, which comprises: a sample flow channel, which is used for conveying a target object specifically bound with a nano-diamond mark, the nano-diamond comprises an NV color center, and the sample flow channel is provided with a detection area; the exciting light module is used for exciting an NV color center of a detection area of the sample flow channel, so that electrons of the NV color center are transited to generate fluorescence; the microwave radiation module is used for providing a microwave field for a detection area of the sample runner; the optical detection module is used for collecting a target material which is specifically bound with the nano-diamond mark at a preset collection frequency, and when the target material flows through the detection area of the sample flow channel, the NV color center in the nano-diamond emits a fluorescence signal of which the intensity is periodically changed by controlling at least one of the intensity, the frequency and the on-off of a microwave field; the fluorescence signal is associated with whether the target contains to-be-detected biomolecules or not. According to the technical scheme provided by the embodiment of the invention, the detection sensitivity of the fluorescence detection system is improved.

The invention provides a high-sensitivity superconducting magnetic detection device and method based on an NV color center under high pressure and low temperature. The high-sensitivity superconducting magnetic detection device comprises a microwave emission module, an optical excitation module, an imaging module, a fluorescence collection module, a data collection and control module, a diamond anvil cell, a low-temperature test module and a magnet module. The method has the beneficial effects that the diamond injected with the NV color center serves as the anvil cell of the diamond anvil cell, and high-pressure and low-temperature conditions are synchronously obtained in liquid helium and liquid nitrogen temperature zones; according to the invention, in-situ pressure measurement can be realized under high pressure, and ruby or Raman standard pressure is not needed; a sample is placed in the diamond anvil cell, the diamond anvil cell is placed in the low-temperature cavity, the lowest temperature of 4K and in-situ pressurization can be realized by using the low-temperature test module, and the quality of a microwave signal transmitted by the low-temperature semi-steel cable is higher and the loss is smaller by using the low-temperature semi-steel cable. And the superconducting property of the material at low temperature and high pressure is quantitatively tested under the condition of high integration.

The invention provides a light source multiplexing diamond NV color center wide field detection system and an illumination detection method. The system comprises a diamond containing an NV color center, an exciting light module, a first double-color sheet, an objective lens, a second double-color sheet, a wide field imaging module, an illumination imaging module and a microwave module, exciting light generated by the exciting light module irradiates the first double-color piece, is guided to the objective lens, and irradiates the diamond after being transmitted by the objective lens so as to excite the NV color center of the diamond to generate fluorescent light; the objective lens is of an infinity type; the exciting light is irradiated to a sample to be detected after being transmitted by the diamond; fluorescent light and exciting light from a sample to be detected are collected by the objective lens, then transmitted to the first double-color piece and guided to the second double-color piece through the first double-color piece, the second double-color piece guides the fluorescent light to the wide-field imaging module for imaging, and the exciting light in the second double-color piece is guided to the illumination imaging module for imaging. Illumination can be achieved in the exciting light working state, exciting light switching operation in the prior art is avoided, and efficiency can be remarkably improved.

In a general aspect, orientation information is used to generate a unique code. In some aspects, orientation information is extracted from an object. The object includes multiple elements, and the orientation information indicates the relative spatial orientations of the respective elements. The orientation information can be extracted, for instance, by a scanner system that detects the elements. A unique code is generated for the object based on the orientation information. In some examples, the elements are diamond particles that each have one or more color centers, and the orientation information is extracted by detecting the color centers.

The invention provides an imaging device and method based on a diamond NV color center, and the device comprises a diamond containing the NV color center, an objective lens assembly, an optical detection module, a displacement platform, and a microwave module. The objective lens assembly comprises an objective lens turntable, and an objective lens and a suction tube which are mounted on the objective lens turntable, the objective lens turntable can switch the objective lens or the suction tube to a working position, and the suction tube is used for introducing negative pressure; the displacement platform is located below the objective lens assembly, and the upper surface of the displacement platform is used for placing a to-be-tested piece and can regulate and control the position of the to-be-tested piece; the diamond is used for being placed on a to-be-tested piece and located below the working position of the objective lens assembly, when the suction pipe is switched to the working position, an opening in the lower end of the suction pipe faces the diamond, and the diamond can be adsorbed or released through negative pressure in the control pipe. And the implementation mode is simple and convenient, the use of other auxiliary equipment is reduced, the occupied space is simplified, and accurate and efficient operation of adsorbing and releasing the diamond can be ensured. By using the device, multiple times of imaging scanning of a large-size to-be-measured piece can be realized.

According to the current comparator based on the diamond NV color center, an iron core module comprises an annular iron core, and the iron core module is arranged on a primary current path in a sleeving mode; the primary feedback module comprises a direct current sensor, a secondary winding and a driven current source; the secondary winding is wound on the annular iron core of the iron core module, the driven current source generates output current, the output current flows through the secondary winding to generate reverse magnetic potential in the annular iron core, and primary magnetic balance in the iron core is achieved; and the secondary feedback module comprises a diamond NV color center magnetic detector module and a PID controller, the diamond NV color center magnetic detector module measures the unbalanced magnetic potential, and the PID controller compensates the current in the secondary winding according to the unbalanced magnetic potential, so that zero magnetic flux is always locked in the iron core. According to the technical scheme, the diamond NV color center magnetic detector module is introduced into the secondary feedback module, the unbalanced magnetic potential in the iron core can be detected in a high-precision mode by means of quantum characteristics, and the measurement precision is greatly improved through the sensitive sensing capacity of the secondary feedback module on tiny magnetic field changes.

In one form of the present disclosure, a quantum sensor comprises a quantum device. The quantum device comprises gallium nitride (GaN) with a color center with a zero-phonon line (ZPL) between about 900 nanometers (nm) and about 990 nm. The GaN can be doped with silicon (Si) and have low carbon (C) and oxygen (O) impurities. In one example, the quantum device is GaN doped with about 1016 atoms of Si per cm3, having less than about 8×1015 C atoms per cm3 and less than about 6×1015 O atoms per cm3, and a Ga vacancy density less than about 1016 vacancies per cm3.

The invention provides a polarization selectivity all-dielectric high-saturation structural color metasurface with a maintainable color center. The metasurface sequentially comprises a SiO2 semi-ellipsoid layer, a GaN elliptic cylinder array and a PDMS flexible substrate from top to bottom, wherein the SiO2 semi-ellipsoid layer and the GaN elliptic cylinder array form a periodically arranged double-layer all-dielectric nanostructure unit. Under the condition of x polarization incidence, the structure generates a narrow-band high-reflection structural color in a visible light wave band, the full width at half maximum of a main reflection peak is about 9 nm, the peak reflectivity can reach 99.8% or above, and the reflectivity of a secondary reflection peak on the short wave side is lower than 0.01; and under the y polarization incidence condition orthogonal to the light source, the reflectivity near the corresponding wavelength is lower than 2%, and the light source shows remarkable polarization selectivity. The inventor further finds that when the equivalent radius change of the nano unit causes the reduction of the reflection efficiency, the reflectivity of the main peak can be recovered by adjusting the long-short axis ratio of the GaN elliptic cylinder and the SiO2 semi-ellipsoid, and the central wavelength of the main formant is basically kept unchanged, so that the brightness adjustment is realized on the premise that the color center is basically constant. The structure is suitable for flexible or wearable optical devices, polarization-related structural color display and other applications.

The invention discloses a direct current comparator for quantum magnetic balance monitoring and a method thereof, and the method is characterized in that the method comprises the following steps: employing a diamond NV color center as a quantum magnetic sensor, so as to read an initial fluorescence signal outputted by the quantum magnetic sensor; feeding the initial fluorescence signal back to a microwave source and a secondary winding side of a proportion coil, adding microwave resonance frequency to the diamond NV color center by using the microwave source, and adding a feedback modulation magnetic field to the diamond NV color center by using the proportion coil; a fluorescence signal of the diamond NV color center under the action of the feedback modulation magnetic field is collected, and the state of the to-be-detected direct current input into the proportion coil is analyzed based on the fluorescence signal intensity. The problems of leakage flux errors, ampere-turn balance errors, feedback control errors and the like in the prior art are solved, the accuracy and stability of current measurement are remarkably improved, and the requirements of high-precision current measurement and calibration are met.

A diamond magneto-optical sensor includes: a diamond that includes a color center with an electronic spin and is irradiated with excitation light, and an irradiation unit that irradiates the diamond with the excitation light of the color center and electromagnetic waves for magnetic resonance, wherein the irradiation unit receives modulated light having been subjected to amplitude modulation, and a modulation frequency of the modulated light is included in a microwave frequency band.

The invention provides an angular displacement measurement method and system based on diamond quantum sensing, and relates to the field of quantum sensing, and the method comprises the steps: taking a diamond NV color center as a probe, placing the probe in a magnetic field and a static magnetic field which rotate at a constant speed, and carrying out the coaxial rotation with a to-be-measured object, the diamond NV color center of the system is measured by adopting continuous light excitation and microwave radiation based on diamond quantum sensing angular displacement; acquiring a first fluorescence signal emitted by the diamond NV color center at a first moment, and outputting a corresponding first traveling wave signal; acquiring a second fluorescence signal emitted by the diamond NV color center at a second moment, and outputting a corresponding second traveling wave signal; and based on the phase difference between the first traveling wave signal and the second traveling wave signal, determining the angular displacement value of the rotation of the object to be measured of the angular displacement measurement system based on diamond quantum sensing. According to the embodiment of the invention, the diamond NV color center is highly sensitive to the change of the magnetic field, and the measurement precision of angular displacement can be improved.

The invention relates to a method for calibrating a quantum sensor, in particular a magnetic field sensor (1), which has a crystal (2) with color centers (2a), in particular a diamond crystal with NV centers. During calibration, the quantum sensor is operated in a calibration mode which comprises the following steps: a) automatically setting a plurality of values of at least one operating parameter (PA, PM, MD, fMW, …) which influences the sensitivity (ηB) of the quantum sensor, b) automatically determining a measure of the sensitivity (ηB) of the quantum sensor for the plurality of values of the at least one operating parameter (PA, PM, MD, fMW, …), and c) automatically selecting a value (PA,OPT, PM,OPT, …) of the at least one operating parameter (PA, PM, …) that is optimal for the sensitivity (ηB) of the quantum sensor. The invention also relates to a quantum sensor, in particular a magnetic field sensor (1), which has a calibration device (12) designed to carry out the method.

The invention discloses a silicon carbide color center laser processing and multi-mode real-time in-situ detection optical device, and belongs to the field of quantum optics and quantum precision measurement. The system comprises a laser processing system, a confocal laser transmission and spectrum detection module, a single photon source detection module, a fluorescence imaging module and a data acquisition processing and control system. Monopulse laser emitted by a laser processing system is used for processing a preprocessed silicon carbide wafer, after silicon carbide is irradiated by femtosecond laser, a light source is switched to excite a defect position, and whether a color center is generated or not and whether the prepared color center is a single photon source or not are detected through a confocal laser transmission and spectrum detection module and a single photon source detection module; and the fluorescence imaging module monitors the forming process of the color center in real time and transmits an acquisition result to the upper computer for processing and analysis. The forming condition of the color center can be monitored in real time and in situ, the yield of the color center and the machining efficiency are improved, and meanwhile it is guaranteed that the finally machined color center is more likely to become a high-quality single photon source.

The invention discloses a simple diamond NV color center four-axis measuring method and device, terminal equipment and a storage medium, and relates to the technical field of vector sensor sensitive axis space direction calibration, and the method comprises the steps: obtaining an ODMR spectrum of a to-be-measured diamond NV color center; adjusting the direction of the applied magnetic field, determining all the directions of the applied magnetic field perpendicular to the first axial direction of the NV color center of the to-be-measured diamond based on the formant condition in the ODMR spectrum, obtaining a first plane, and then determining the first axial direction; adjusting the direction of the external magnetic field in the first plane, and determining a second plane when the formant of the ODMR spectrum changes; adjusting the direction of the external magnetic field in a second plane, and determining a second axial direction when the formant of the ODMR spectrum changes again; and calculating a third axial direction and a fourth axial direction of the NV color center of the diamond to be measured according to the first axial direction and the second axial direction. By means of the method, the four axial directions of the NV color center of the diamond can be measured at a time.

A magnetometer includes a resonant atomic medium, a photonic crystal surface emitting laser (PCSEL), and a light detector. The resonant atomic medium includes color centers or other dopants that form vacancies that fluoresce light when excited by an excitation light having an excitation wavelength. Characteristics of the fluoresced light are dependent upon a magnetic field applied to the resonant atomic medium. The PCSEL is configured to develop the excitation light having the excitation wavelength of the vacancies and direct the excitation light into the resonant atomic medium. The light detector is configured to receive the fluoresced light and generate a measurement signal indicative of the fluoresced light and the magnetic field applied to the resonant atomic medium.

The invention discloses a nondestructive testing and noise filtering method, system and device and a storage device. The nondestructive testing and noise filtering method comprises the steps that first detection data obtained when a diamond NV color center is subjected to magnetic flux leakage detection are collected; wherein the first detection data at least comprises feedback fluorescence and a scanning position corresponding to the feedback fluorescence; converting the feedback fluorescence into a fluorescence electric signal, and performing noise reduction processing on the fluorescence electric signal by using a first adaptive denoising algorithm; and calculating and analyzing the signal after noise reduction processing to obtain magnetic field information. According to the method, the leakage magnetic field of the ferromagnetic material defect is detected through the high-sensitivity NV color center magnetic sensor, and the self-developed adaptive wavelet threshold denoising method is combined, so that the environmental noise is effectively inhibited, and the weak magnetic field signal is accurately extracted; a quantum precision measurement platform is built based on the NV color center magnetic sensor, and detection of extremely tiny cracks can be achieved; the microwave frequency is supported to dynamically adjust the sensitivity so as to adapt to different detection requirements, and the detection precision and adaptability in a complex industrial environment are remarkably improved.

A nanoscale temperature detector comprising a diamond sensing probe (1) having a lateral dimension of at least 200 nanometers and having a sensing tip (2) with a radius of curvature (R) of less than 100 nanometers, less than 10 nanometers or less than 1 nanometer and a plurality of color centers (5) showing temperature sensitive features in the emission count rate. The diamond sensing probe (1) has a lateral dimension of at least 200 nanometers and is connected to a detector system (13) by a mounting structure (6). A thermal isolation barrier (3) thermally separates the sensing probe (1) from the detector system (13).

The application discloses a two-dimensional magnetic field imaging method based on diamond NV color centers, comprising the following steps: generating a rough scanning path according to a region to be measured, controlling a displacement scanning unit to drive a diamond NV color center detection unit to move point by point, locking and triggering collection after reaching a position; obtaining the light detection magnetic resonance spectrum of each measuring point through light excitation and microwave sweep, and calculating the magnetic field information; identifying an abnormal region according to the rough scanning result and generating a fine scanning path, and performing fine scanning on the abnormal region; periodically returning to a reference point to collect a reference spectrum line during the scanning process, and compensating for the drift of the current batch of measuring points, and finally matching the compensated magnetic field information with coordinate information to generate a two-dimensional magnetic field distribution map. The application can improve the positioning accuracy, measurement stability and imaging reliability of two-dimensional magnetic field imaging.

The invention provides a PUF label based on a diamond NV color center Raman spectrum and an encoding method, an information encoding control unit is connected with a Raman spectrometer, a mobile bearing table and an optical imaging assembly, and is used for controlling the displacement of the mobile bearing table, so that the optical imaging assembly can perform high-precision focusing on the NV color center of a diamond sample and then perform imaging; the information coding control unit is used for receiving spectrum data from the Raman spectrometer, extracting characteristic information related to the NV color center, coding Raman spectrum information of the NV color center at different positions, and generating a physically unduplicated encryption label by utilizing a preset coding rule. The Raman spectrum information of the NV color center of the diamond sample under the excitation of the specific wavelength is used for coding the Raman spectrum information at different positions of the diamond sample, the encrypted label of any system is drawn, non-contact and lossless unique fingerprint identification is achieved, and the prepared label is difficult to decode, resistant to radiation and huge in information bearing capacity.

The invention discloses a solid-state spin quantum nondestructive detector, which comprises a laser module used for outputting excitation light, and an NV color center generates photoluminescence under the irradiation of the excitation light; the microwave module is used for outputting and modulating a microwave signal; the sensor is used for detecting an external leakage magnetic field and comprises an optical fiber with one side end face being an inclined plane and a diamond which is arranged below the inclined plane and contains an NV color center, and the excitation light is transmitted through the optical fiber and then forms reflection excitation light and transmission excitation light through the inclined plane; according to the invention, a part of split excitation light is used as reference light to carry out differential noise reduction processing, so that the measurement precision is improved, and the surface crack of the to-be-measured object can be accurately measured; the beveled optical fiber is combined with the diamond containing the ensemble NV color center, the beveled optical fiber is used for replacing a traditional optical prism or an optical fiber beam splitter to achieve laser beam splitting, and the beveled optical fiber beam splitter has the advantage of being small and exquisite and can be conveniently integrated on a microstrip antenna.

The application discloses a kind of defect detection method and equipment based on NV color center, it is related to nondestructive testing technical field.The present application discloses a kind of defect detection method and equipment based on NV color center, it is related to nondestructive testing technical field.The present application discloses a kind of defect detection method and equipment based on NV color center, it is related to nondestructive testing technical field.The present application discloses a kind of defect detection method and equipment based on NV color center, it is related to nondestructive testing technical field.The present application discloses a kind of defect detection method and equipment based on NV color center, it is related to nondestructive testing technical field.The present application discloses a kind of defect detection method and equipment based on NV color center, it is related to nondestructive testing technical field.The present application discloses a kind of defect detection method and equipment based on NV color center, it is related to nondestructive testing technical field.The present application discloses a kind of defect detection method and equipment based on NV color center, it is related to nondestructive testing technical field.The present application discloses a kind of defect detection method and equipment based on NV color center, it is related to nondestructive testing technical field.The present application discloses a kind of defect detection method and equipment based on NV color center, it is related to nondestructive testing technical field.The present application discloses a kind of defect detection method and equipment based on NV color center, it is related to nondestructive testing technical field.The present application discloses a kind of defect detection method and equipment based on NV color center, it is related to nondestructive testing technical field.The present application discloses a kind of defect detection method and equipment based on NV color center, it is related to nondestructive testing technical field.The present application discloses a kind of defect detection method and equipment based on NV color center, it is related to nondestructive testing technical

The invention provides a current measurement method and device based on an NV color center, electronic equipment, a storage medium and a computer program product, and relates to the technical field of quantum sensing measurement. The current measurement method comprises the following steps: exciting an NV color center based on a laser signal; applying a microwave signal in a preset frequency range to the NV color center to determine a magnetic resonance spectral line corresponding to the preset frequency range; determining a resonance microwave frequency closest to a preset frequency range according to the magnetic resonance spectral line; adjusting the relative distance between the NV color center and the to-be-measured wire according to the size of the resonance microwave frequency; and determining current information of the to-be-detected wire according to the relative distance between the NV color center and the to-be-detected wire. By adjusting the relative distance between the NV color center and the wire to be measured, the resonance microwave frequency can be adjusted to be within the frequency range capable of being output by the microwave source, and therefore the measuring range of the current measuring device is enlarged.

This quantum device comprises: a plurality of quantum bit elements each including a diamond crystal layer, which has a central part and extension parts connected to the central part and extending in 2n directions (n is an integer of 2 or more) from the central part, and a color center formed in the central part; input optical waveguides which are respectively connected to n end sections of the extension parts and transmit light that enters the color center; output optical waveguides which are respectively connected to the n end sections of the extension parts and transmit photons emitted by the color center; and a splitter connected to an output waveguide of a first quantum bit element among the plurality of quantum bit elements and an output waveguide of a second quantum bit element among the plurality of quantum bit elements.　

The invention discloses an insulation defect detection method based on a quantum color center technology, and belongs to the field of state monitoring. Comprising the steps that a quantum sensing module and an excitation and signal acquisition module are adopted to detect the insulation defect of the electrical equipment, the quantum sensing module adopts a silicon carbide color center chip, a double-vacancy defect is prepared through an ion implantation and annealing process, a substrate material adopts AlN ceramic, and a protective layer adopts an aerogel composite structure; a DPSS laser is adopted as a light source of a laser excitation chain of an excitation and signal acquisition module, and a single-photon avalanche diode array is adopted as a detector of a fluorescence acquisition chain; a signal processing flow is based on silicon carbide double-vacancy color center fluorescence lifetime attenuation characteristics, partial discharge detection is carried out, dynamic change and frequency spectrum characteristics of a color center fluorescence lifetime tau value are analyzed, a multi-physics field decoupling algorithm combining time domain fluorescence lifetime analysis, frequency domain vibration spectrum extraction and a machine learning classification model is adopted, and a silicon carbide double-vacancy color center fluorescence lifetime tau value is analyzed. And high-precision identification and positioning of discharge types such as corona discharge and creeping discharge are realized.

The invention discloses a preparation method and application of a directional NV color center diamond layer for vector magnetic field measurement, and aims to solve the technical problems of measurement signal anisotropy attenuation, sensitivity reduction and the like caused by a randomly oriented NV color center in a diamond quantum magnetic sensing system based on the NV color center. The preparation method comprises the following steps: 1, pre-treating a seed wafer in mixed acid; 2, carrying out etching treatment by using hydrogen plasma; 3, introducing nitrogen, methane, oxygen and hydrogen into the vacuum cavity, controlling process parameters such as gas concentration, growth temperature and pressure intensity, and carrying out microwave plasma chemical vapor deposition growth; 4, cooling; 5, cutting off polycrystals; and 6, annealing treatment. According to the NV color center coherence time field grown by the preparation method, the orientation rate can reach more than 80%, the orientation high-sensitivity measurement of the vector magnetic field can be realized by accurately controlling the spatial orientation distribution of the NV color center, and the detection performance of the quantum sensor is remarkably improved.

Devices, systems, and methods that use a structure are provided. The structure may include a waveguide layer and an intrinsically stressed thin film. The waveguide layer may include a first material. The intrinsically stressed thin film may include a second material. The intrinsically stressed thin film may be disposed on the waveguide layer, thereby inducing a strain in the waveguide layer. The first material may include at least one color center having a first pair and / or second pair of energy levels or quantum states having an optical energy separation and / or a second pair of energy levels or quantum states having a microwave energy separation. The optical energy separation and the microwave energy separation of the pair of energy levels and / or quantum states may be determined by the induced strain.