CN108385163A - Diamond crystal and inertia motion measuring device based on diamond quantum defect center - Google Patents

Diamond crystal and inertia motion measuring device based on diamond quantum defect center Download PDF

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Publication number
CN108385163A
CN108385163A CN201710154562.5A CN201710154562A CN108385163A CN 108385163 A CN108385163 A CN 108385163A CN 201710154562 A CN201710154562 A CN 201710154562A CN 108385163 A CN108385163 A CN 108385163A
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diamond
diamond crystal
area
region
substrate
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CN201710154562.5A
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Chinese (zh)
Inventor
杨承
李东宪
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    • CCHEMISTRY; METALLURGY
    • C30CRYSTAL GROWTH
    • C30BSINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B29/00Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
    • C30B29/02Elements
    • C30B29/04Diamond
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01PMEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P15/00Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01PMEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/36Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/40Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for measuring magnetic field characteristics of the earth

Abstract

The present invention discloses a kind of inertia motion measuring device based on diamond quantum defect center.Described device includes:Diamond crystal, microwave antenna, electromagnetic coil, laser, optical sensor and signal processor;Wherein, the diamond crystal includes the first area for being respectively provided with several defect centers NV, second area and third region, projection non-overlapping copies of first, second, and third region at least one perspective plane;The imaging plane of the optical sensor is parallel with the perspective plane, for sense because first, second, and third region respectively the defect centers NV electron spin resonance generation optical signal;The signal processor is used to handle the optical signal of the optical sensor sensing.After implementing the present invention, same diamond crystal can be utilized to sense multiple inertia motion parameters simultaneously, relative to conventional inertia sensor, the present invention has higher integrated level, stability and measurement accuracy.

Description

Diamond crystal and inertia motion measuring device based on diamond quantum defect center
Technical field
The technology that diamond quantum defect center measures inertia motion parameter is the present invention relates to the use of, is especially used for simultaneously Measure the diamond crystal of multiple inertia motion parameters and the inertia motion measuring device using the diamond crystal.
Background technology
With unmanned plane, internet of things equipment in the ascendant and various, the machine man-based development of pilotless automobile, work More stringent requirements are proposed for the volume of inertia motion sensor, precision, stability and integrated level for industry.And conventional inertia passes Sensor is increasingly difficult to there are many limitations to meet actual needs.
Diamond nitrogen vacancy center (centers Nitrogen-Vacancy center, NV) is common in diamond crystal Defects, the vacancy on a nitrogen-atoms and neighboring lattice points by replacing carbon atom in lattice are constituted.This defect Structure forms unique quantum level:In the case of no external electromagnetic field, it is decomposed into m_s=0's according to electron spin The energy level of energy level and m_s=+1 or -1, energy level spacing is 2.87GHz between the two.Scientific research discovery, the centers NV quantum level Structure is all highly sensitive to magnetic field, electric field, external force, acceleration and rotation.For example, stress can make the energy level at the centers NV shift And mixing, acceleration and linear movement can be derived by measuring this energy level variations by optical signalling.Simultaneously as Buddha's warrior attendant The excellent physical characteristic of stone, this quantum level structure (including at room temperature) can keep stablizing within a wide temperature range, More inertia motions based on diamond quantum defect with high integration, high stability, high-precision, small size are allowed in this way Parameter detecting technology is possibly realized.
Invention content
It is an advantage of the invention to provide a kind of diamond for being used for while measuring multiple inertia motion parameters is brilliant Body.
The present invention is achieved through the following technical solutions:Construct a kind of diamond crystal, which is characterized in that the diamond is brilliant Body includes the multiple first areas for being respectively provided with several defect centers NV, multiple second areas and multiple third regions, and described One, second and projection non-overlapping copies of the third region at least one perspective plane.
Further, the diamond crystal include substrate, it is multiple by the outwardly extending pedestal of substrate and multiple by pedestal Outwardly extending ennation, and the first area is located in the ennation, and the second area is located in the pedestal, The third region is located in the substrate.
Optionally, the ennation is bullet.
Preferably, the first area is located at the top of the ennation.
It is a further object of the invention to provide it is a kind of and meanwhile measure multiple inertia motion parameters based on diamond amount The inertia motion measuring device of sub- defect center.
The present invention is achieved through the following technical solutions:Construct a kind of inertia motion survey based on diamond quantum defect center Measure device, which is characterized in that described device includes:Diamond crystal, for the microwave to the diamond crystal irradiating microwaves Antenna, the electromagnetic coil for generating stationary magnetic field, laser, optical sensor for irradiating laser to the diamond crystal And signal processor;Wherein, the diamond crystal includes the first area for being respectively provided with several defect centers NV, the secondth area Domain and third region, projection non-overlapping copies of first, second, and third region at least one perspective plane;The light passes Sensor be used for sense because first, second, and third region respectively the defect centers NV electron spin resonance generate light believe Number;The signal processor is used to handle the optical signal of the optical sensor sensing.
Preferably, the diamond crystal include substrate, it is multiple from the outwardly extending pedestal of substrate and it is multiple from pedestal to The ennation of outer extension, and the third region is located in the substrate, and the second area is located in the pedestal, described First area is located in the ennation.
Preferably, the ennation can be bullet.Since the spot size that bullet bottom is connect with pedestal is smaller, Therefore base interior easy tos produce larger stress under the influence of extraneous acceleration, in order to measure.
Preferably, the third region is located at the top of the ennation.
Preferably, the electromagnetic coil is embedded in the substrate of the diamond crystal.
Preferably, the microwave antenna is embedded in the substrate of the diamond crystal.
The beneficial effects of the invention are as follows:1) centers NV in the first area of diamond ennation structural top are transported in rotation To keep the fixed magnetic field of the opposite electromagnetic coil of conservation of angular momentum meeting to move when dynamic, to which energy level obtains extra phase, by right The phase information of the nuclear spin of the nitrogen-atoms at the centers NV, which measures, can derive angular velocity information.It is obtained because of angular movement The measurement of Spin Echo methods may be used in the extra phase obtained.2) connect with substrate since the pedestal is located at diamond ennation Place is met, therefore the centers NV of the second area at pedestal can be made described second in the case where the external world accelerates by larger stress, stress The energy level at the centers NV is shifted and is mixed in region.Therefore Spin Echo methods detection level shift may be used, to push away Export acceleration and linear movement parameter.3) centers NV in the third region in diamond substrate can be used for measuring earth's magnetic field And temperature change.The centers NV of diamond substrate will not be influenced by moving, and geomagnetic field intensity is proportional to the centers NV of substrate Energy level difference, so as to by the distance of two troughs of ESR under continuous microwave, measure earth's magnetic field absolute value, earth's magnetic field letter Breath can be used as absolute location information for positioning.Since the first, second, and third region is in the imaging plane of sensor Non-overlapping copies are projected, therefore sensor can capture the fluorescence that the first, second, and third region is respectively sent out simultaneously, without going out It now interferes with each other, therefore device can utilize the diamond crystal to measure the inertia such as acceleration, angular speed and earth's magnetic field simultaneously Kinematic parameter.
Description of the drawings
Fig. 1 is diamond crystal structures schematic diagram according to an embodiment of the invention;
Fig. 2 is the schematic diagram of projection of the diamond crystal in perspective plane in Fig. 1.;
Fig. 3 is the inertia motion measuring device according to an embodiment of the invention based on diamond quantum defect center Structural schematic diagram.
Figure label meaning is as follows:
Diamond crystal 10;
Bullet 101;
Pedestal 102;
Substrate 103;
Fluorescence 104;
First area 111;
Second area 112;
Third region 113;
Perspective plane 120;
Projection 121;
Microwave antenna 20;
Electromagnetic coil 30;
Laser 40;
Laser 401;
Optical sensor 50;
Optical element 60;
Signal processor 80.
Specific implementation mode
Below in conjunction with attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete Ground describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Usually exist The component of the embodiment of the present invention described and illustrated in attached drawing can be arranged and be designed with a variety of different configurations herein.Cause This, the detailed description of the embodiment of the present invention to providing in the accompanying drawings is not intended to limit claimed invention below Range, but it is merely representative of the selected embodiment of the present invention.Based on the embodiment of the present invention, those skilled in the art are not doing The every other embodiment obtained under the premise of going out creative work, shall fall within the protection scope of the present invention.
Fig. 1 is diamond crystal structures schematic diagram according to an embodiment of the invention.
As shown in Figure 1, diamond crystal 10 includes bullet 101, pedestal 102 and substrate 103.Diamond crystal 10 includes It is respectively provided with first area 111, second area 112 and the third region 113 of several defect centers NV, with reference to Fig. 2, first 121 non-overlapping copies of projection of region 111, second area 112 and third region 113 at least one perspective plane 120.At some In embodiment, diamond crystal 10 includes substrate 103, multiple by 103 outwardly extending pedestal 102 of substrate and multiple by pedestal 102 outwardly extending bullets 101, and third region 111 is located in substrate 103, and second area 112 is located in pedestal 102, First area 113 is located in bullet 101.Since the spot size that 101 bottom of bullet is connect with pedestal 102 is smaller, Under the influence of extraneous acceleration, larger stress is easy tod produce inside pedestal 102, convenient for measuring, it is advantageous to use bullet 101.It is easily understood that the ennation of other shapes can also be used to substitute bullet 101.
Diamond crystal 10 can by growth, depositing operation be formed on substrate 103 multiple pedestals and bullet 101 come It realizes, 103 size of substrate can be about 1mm x 1mm x 100um.Due to the different location directly on the big substrate 103 of monoblock Bullet-pedestal the diamond lattic structure for growing the proper height that can be matched with the wavefront of laser 401 with detection is more difficult to It realizes, entire substrate 103 can also be divided into fritter one by one, be given birth to respectively on 103 fritter of a part of substrate wherein Then long bullet-pedestal diamond lattic structure is placed on according to the height to grow out on its suitable position.Also, according to need The defect centers NV, the defect centers diamond NV of these different zones are formed by doping in bullet, pedestal and substrate 103 It is respectively used to measure different inertia motion parameters.
Since pedestal 102 is located at diamond ennation and 103 junction of substrate, the second area 112 at pedestal 102 The centers NV the energy level at the centers NV in second area 112 can be made to shift by larger stress, stress in the case where the external world accelerates And mixing.Therefore Spin Echo methods detection level shift may be used, to derive acceleration and linear movement parameter.
For the ease of measuring angular speed parameter, first area 111 is preferably placed at the top of bullet 101.It in this way can be Larger momentum is generated during angular movement.The centers NV in the first area at 101 top of bullet of diamond crystal 10 exist To keep the fixed magnetic field movement of conservation of angular momentum meeting electromagnetic coil 30 relatively when rotary motion, to which energy level obtains additional phase Position, angular velocity information can be derived by being measured by the phase information of the nuclear spin of the nitrogen-atoms to the centers NV.Cause Angular movement and the measurement of Spin Echo methods still may be used in the extra phase that obtains.
The centers NV in third region 113 in diamond substrate 103 can be used for measuring earth's magnetic field and temperature change.Gold The centers NV of hard rock substrate 103 will not be influenced by moving, and geomagnetic field intensity is proportional to the energy level at the centers NV of substrate 103 Difference, so as to by the distance of two troughs of ESR under continuous microwave, measure earth's magnetic field absolute value, geomagnetic field information can be with As absolute location information for positioning.
Fig. 2 is the schematic diagram of projection of the diamond crystal 10 in perspective plane in Fig. 1.First area 111, second area 112 and projection 121 of the third region 113 in perspective plane 120 be not overlapped mutually.When optical sensor 50 is parallel with perspective plane 120 When, the picture non-overlapping copies of first area 111, second area 112 and third region 113 in the imaging plane of sensor, therefore Optical sensor 50 can capture the fluorescence 104 that first area 111, second area 112 and third region 113 are respectively sent out simultaneously, Without interfering with each other, therefore diamond crystal 10 can be used for measuring the inertia such as acceleration, angular speed and earth's magnetic field fortune Dynamic parameter.
Fig. 3 is the inertia motion measuring device according to an embodiment of the invention based on diamond quantum defect center Structural schematic diagram.As shown in figure 3, the inertia motion measuring device based on diamond quantum defect center of the present invention includes:Gold Hard rock crystal 10, for the microwave antenna 20 to 10 irradiating microwaves of diamond crystal, the electromagnetic coil for generating stationary magnetic field 30, laser 40, the optical sensor 50 for irradiating laser 401 to diamond crystal 10, optical element 60 and signal processing Device 80.
Diamond crystal 10 includes first area 111, second area 112 and the third for being respectively provided with several defect centers NV Region 113, the projection non-overlapping copies of first area 111, second area 112 and third region 113 on the projection surface;Laser 40 The laser 401 of generation irradiates diamond crystal 10 and excites the defect centers NV in diamond vigilant 10 to excite electron spin total It shakes and generates fluorescence 104.Optical element 60 may include spectroscope and optical filter, the laser that spectroscope is used to generate in laser 40 401 are refracted to diamond crystal direction, and optical filter is used to filter out the optical signal other than the fluorescence 104 of electron spin resonance generation. The sensitized lithography of optical sensor 50 is parallel with perspective plane 120, for sensing because of first area 111, second area 112 and third area The fluorescence 104 that the electron spin resonance of the 113 respective defect centers NV of domain generates;Signal processor 80 is for handling optical sensor 50 Sensing result calculates separately out corresponding inertia motion parameter according to algorithm above-mentioned.
In some embodiments, electromagnetic coil 30 and microwave antenna 20 can be embedded in the substrate 103 of diamond crystal 10 In.To further increase the integrated level and reliability of system.
The fundamental measurement principle of the present invention is, the 532nm laser 401 sent out using laser 40 is by the centers NV from quantum base State | g>(i.e. track singlet-Spin-triplet) is excited by absorbing (off-resonance) pump of a phonon off-resonance to it State | e>.Then the atom in excitation state will attempt to rebuild ANALOGY OF BOLTZMANN DISTRIBUTION and relaxation (optical relaxation) returns To ground state, launch~the fluorescence 104 of 640-800nm in the process.This optical signal is then after spectroscope, optical filter etc. It is sensed by optical sensor 50.
On the other hand, two-phonon process can keep spin conservation, therefore in excitation state | e, ms=0>State and | e, ms=+-1 >State can distinguish relaxation and arrive | g, ms=0>State and | g, ms=+-1>State, but | e, ms=+-1>Have more can first relaxations to metastable State | s>Ground state is arrived again, and elapsed-time standards is longer.After the excitation of laser 401, the fluorescence intensity of the two can differ 30%, therefore can be with How much initial stage after the excitation of laser 401 is distinguished according to the light intensity of fluorescence 104 in ms=0 states or ms=+-1 states.The electricity of substrate The stationary magnetic field that magnetic coil 30 generates can detach ms=-1 and ms=+1 states, this is Zeemen effect (Zeeman Effect).This When optical detection magnetic resonance method, i.e. Optically Detected Magnetic Resonance (ODMR) method may be used, The microwave antenna 20 being embedded in using substrate is emitted microwave signal irradiation diamond crystal 10 and adjusts microwave frequency, is measured simultaneously Electron spin resonance Electron Spin Resonance (EPR) fluorescence intensity.In no external magnetic field, when microwave frequency and When ms=0 states are identical as the difference on the frequency D=2.87GHz of ms=+-1 states, fluorescence spectrum can weaken (because more polyatom is by microwave It is transferred to ms=+-1 states);And if there is externally-applied magnetic field, there will be two troughs by EPR, are spaced corresponding Zeeman Effect and generate Ms=-1 and ms=+1 state energy level differences.
Continuous microwave or Ramsey the or Spin Echo with different pulse microwave sequences can be used in the specific energy shift that measures Method.Ramsey methods be in detectable signal are not in atom by laser 401 again blowback compared to the benefit of continuous microwave The interference of excitation state, therefore time of measuring tau is determined by decoherence time (decoherence time) T*_2 of electron spin, In musec order under this room temperature.The deficiency of Ramsey methods is the shadow that measuring signal nevertheless suffers from stationary magnetic field itself fluctuation It rings.And the method for Spin Echo be then the increase in a Pi pulse can eliminate external magnetic field fluctuation interference, precision determine Determine that this is up in musec orders up to a hundred in AC decoherence times T_2 of electron spin.
In conclusion the small-sized IMU elements (~1mmx1mmx100um) based on the centers NV quantum effect of the present invention, energy Enough while realizing various linear, angular motion and absolute position high-acruracy surveys, stress measurement precision<1aN/Hz1/2, angle Measurement accuracy<10-4degree/sHz1/2, geomagnetic field measuring precision<1pT/Hz1/2, while controlling temperature drift<100mK/ Hz1/2。
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that:Not In the case of being detached from the principle of the present invention and objective a variety of change, modification, replacement and modification can be carried out to these embodiments, this The range of invention is limited by claim and its equivalent.

Claims (10)

1. a kind of diamond crystal, which is characterized in that the diamond crystal includes be respectively provided with several defect centers NV more A first area, multiple second areas and multiple third regions, first, second, and third region is at least one perspective plane On projection non-overlapping copies.
2. diamond crystal according to claim 1, which is characterized in that the diamond crystal includes substrate, Duo Geyou The outwardly extending pedestal of substrate and multiple by the outwardly extending ennation of pedestal, and the first area is located at the ennation In, the second area is located in the pedestal, and the third region is located in the substrate.
3. diamond crystal according to claim 2, which is characterized in that the ennation is bullet.
4. diamond crystal according to claim 2, which is characterized in that the third region is located at the top of the ennation Portion.
5. a kind of inertia motion measuring device based on diamond quantum defect center, which is characterized in that
Described device includes:Diamond crystal, for the diamond crystal irradiating microwaves microwave antenna, for generating perseverance The electromagnetic coil of fixed-field, laser, optical sensor and signal processor for irradiating laser to the diamond crystal;
Wherein, the diamond crystal includes the first area for being respectively provided with several defect centers NV, second area and third area Domain, projection non-overlapping copies of first, second, and third region at least one perspective plane;
The optical sensor is used to sense the electron spin resonance because of the respective defect centers NV in first, second, and third region The optical signal of generation;
The signal processor is used to handle the optical signal of the optical sensor sensing.
6. diamond crystal according to claim 7, which is characterized in that the diamond crystal includes substrate, Duo Geyou The outwardly extending pedestal of substrate and multiple by the outwardly extending ennation of pedestal, and the third region is located at the substrate In, the second area is located in the pedestal, and the first area is located in the ennation.
7. the inertia motion measuring device according to claim 8 based on diamond quantum defect center, which is characterized in that The ennation is bullet.
8. the inertia motion measuring device according to claim 8 based on diamond quantum defect center, which is characterized in that The third region is located at the top of the ennation.
9. the inertia motion measuring device according to claim 8 based on diamond quantum defect center, which is characterized in that The electromagnetic coil is embedded in the substrate of the diamond crystal.
10. the inertia motion measuring device according to claim 1 based on diamond quantum defect center, feature exist In the microwave antenna is embedded in the substrate of the diamond crystal.
CN201710154562.5A 2017-03-15 2017-03-15 Diamond crystal and inertia motion measuring device based on diamond quantum defect center Pending CN108385163A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114279590A (en) * 2021-12-28 2022-04-05 哈尔滨工业大学 Temperature sensor and temperature measuring device based on diamond NV color center
WO2022121116A1 (en) * 2020-12-08 2022-06-16 之江实验室 Optical tweezer and spin defect-based multi-physical parameter sensing device and method
JP7381816B2 (en) 2022-04-08 2023-11-16 之江実験室 Optical levitation angular velocity measurement device and method based on the geometric phase of solid-state atomic spins

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CN102575380A (en) * 2009-06-26 2012-07-11 六号元素有限公司 Method for treating single crystal CVD diamond and product obtained
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CN105403210A (en) * 2015-12-24 2016-03-16 北京航空航天大学 Tiny single-axis diamond gyro
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US20120019242A1 (en) * 2008-11-04 2012-01-26 The University Of Melbourne Method and apparatus for monitoring a property of a sample
CN102575380A (en) * 2009-06-26 2012-07-11 六号元素有限公司 Method for treating single crystal CVD diamond and product obtained
US20110309265A1 (en) * 2010-04-19 2011-12-22 President And Fellows Of Harvard College Diamond nanowires
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Publication number Priority date Publication date Assignee Title
WO2022121116A1 (en) * 2020-12-08 2022-06-16 之江实验室 Optical tweezer and spin defect-based multi-physical parameter sensing device and method
CN114279590A (en) * 2021-12-28 2022-04-05 哈尔滨工业大学 Temperature sensor and temperature measuring device based on diamond NV color center
JP7381816B2 (en) 2022-04-08 2023-11-16 之江実験室 Optical levitation angular velocity measurement device and method based on the geometric phase of solid-state atomic spins

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Application publication date: 20180810