阅读说明：本技术 基于dac装置探测金刚石nv色心的odmr谱的实验装置 (Experimental device for detecting ODMR spectrum of diamond NV color center based on DAC device ) 是由 韩永昊 杨磊 赵琳 田慧锋 高春晓 于 2019-09-11 设计创作，主要内容包括：本发明公开了一种基于DAC装置探测金刚石NV色心的ODMR谱的实验装置,所述激光器射出的光路上依次安装有扩束透镜、反射镜二、反射镜一、聚焦镜头、红宝石和金刚石NV色心；所述红宝石及金刚石NV色心发出的荧光的光路上依次设有聚焦镜头、滤波镜片和准直透镜、光电探测器,光电探测器连接信号采集器；所述微波发生器通过SMA端口连接线依次与功率放大器、铜线连接；铂线两端连有铜线；所述金刚石NV色心挑至铂线附近。发明提供的基于DAC装置探测金刚石NV色心的ODMR谱的实验装置,结构简单,为超导现象的检测等提供了新的选择。(The invention discloses an experimental device for detecting an ODMR spectrum of a diamond NV color center based on a DAC device, wherein a beam expanding lens, a second reflecting mirror, a first reflecting mirror, a focusing lens, a ruby and the diamond NV color center are sequentially arranged on a light path emitted by a laser; a focusing lens, a filtering lens, a collimating lens and a photoelectric detector are sequentially arranged on a light path of fluorescence emitted by the ruby and diamond NV color center, and the photoelectric detector is connected with a signal collector; the microwave generator is sequentially connected with the power amplifier and the copper wire through the SMA port connecting wire; copper wires are connected with two ends of the platinum wire; the diamond NV centre is chosen to be near the platinum wire. The experimental device for detecting the ODMR spectrum of the NV color center of the diamond based on the DAC device has a simple structure, and provides a new choice for detection of a superconducting phenomenon and the like.)

1. Experimental device for detecting ODMR spectrum of diamond NV color center based on DAC device is characterized in that: the device comprises a diamond NV color center (1), a focusing lens (2), a first reflecting mirror (3), a filtering lens (4), a collimating lens (5), a spectrometer (6), a second reflecting mirror (7), a beam expanding lens (8), a laser (9), a photoelectric detector (10), a microwave generator (11), an SMA port connecting wire (12), a power amplifier (13), a platinum wire (14), a copper wire (15), a DAC device (16), a gasket (17), a ruby (18) and a signal collector (19);

The ruby (18) and diamond NV colour centre (1) are located within a pad (17) sample chamber of a DAC device (16);

A beam expanding lens (8), a second reflecting mirror (7), a first reflecting mirror (3), a focusing lens (2), a ruby (18) and a diamond NV color center (1) are sequentially arranged on a light path emitted by the laser (9); the beam expanding lens (8) enlarges the beam diameter and the divergence angle of the laser (9); the directions of the first reflecting mirror (3) and the second reflecting mirror (7) are kept consistent when the laser irradiates the ruby (18) and the diamond NV color center (1) so as to ensure that the directions of the first reflecting mirror and the second reflecting mirror are parallel to the direction of the laser beam; the ruby (18) and the diamond NV color center (1) are sequentially placed at the focus of the focusing lens (2);

A focusing lens (2), a filter lens (4), a collimating lens (5) and a photoelectric detector (10) are sequentially arranged on the light path of fluorescence emitted by the ruby (18) and the diamond NV color center (1), and the photoelectric detector (10) is connected with a signal collector (19); fluorescence generated by the ruby (18) and the diamond NV color center (1) enters the photoelectric detector (10) through the focusing lens (2), the filtering lens (4) and the collimating lens (5) and is collected by the signal collector (19); the ODMR spectrum of the diamond NV color center (1) is collected and recorded by a signal collector (19); the first reflector (3) needs to be removed or the lens needs to be inverted before the fluorescence signal is collected; the collimating lens (5) changes the fluorescence from the filtering lens (4) into a parallel collimated light beam;

the microwave generator (11) is sequentially connected with the power amplifier (13) and the copper wire (15) through an SMA port connecting wire (12); microwave signals sent by the microwave generator (11) are connected with the power amplifier (13) through the SMA port connecting wire (12) and then transmitted to the copper wire (15);

The wire cutting machine further comprises a platinum wire (14), wherein the platinum wire (14) is positioned at a position bisecting the anvil surface, and two ends of the platinum wire (14) are connected with copper wires (15);

The ruby (18) and the diamond NV color center (1) are picked to the anvil surface of the diamond and then placed on a three-dimensional platform of a laser (9), and a platinum wire (14) is insulated from a gasket (17);

The diamond NV color center (1) is close to the platinum wire (14), and the ruby (18) is 10mm away from the diamond NV color center (1).

2. The experimental apparatus for detecting ODMR spectrum of NV color center of diamond based on DAC device according to claim 1, wherein: the laser (9) emits laser wavelength of 532 nm.

3. The experimental apparatus for detecting ODMR spectrum of NV color center of diamond based on DAC device according to claim 1, wherein: the focusing lens (2), the first reflecting mirror (3), the filtering lens (4), the collimating lens (5), the spectrograph (6), the second reflecting mirror (7), the beam expanding lens (8) and the laser (9) are positioned on the same horizontal table.

4. The experimental apparatus for detecting ODMR spectrum of NV color center of diamond based on DAC device according to claim 1, wherein: the DAC device (16) is provided with two copper wires (15), the two copper wires (15) are fixed on the diamond side edge of the DAC device (16) through glue, and the end face of each copper wire is cut into 35 degrees; the copper wire (15) has an insulating layer on the outer layer and the outlet end is grounded.

5. The experimental apparatus for detecting ODMR spectrum of NV color center of diamond based on DAC device according to claim 1, wherein: the platinum wire (14) is connected with copper wires (15) at two ends by silver paste, and then heated to 150 ℃ in an oven, and the heating time lasts for 30 minutes.

6. The experimental apparatus for detecting ODMR spectrum of NV color center of diamond based on DAC device according to claim 1, wherein: the platinum wire (14) has a width within 10-20 microns.

7. the experimental apparatus for detecting ODMR spectrum of NV color center of diamond based on DAC device according to claim 1, wherein: the pad (17) is placed on the anvil surface of the DAC device (16) and the lower end is fixed by vacuum mud.

8. The experimental apparatus for detecting ODMR spectrum of NV color center of diamond based on DAC device according to claim 1, wherein: the signal collector (19) adopts a program written by LabVIEW software.

Technical Field

The invention belongs to the technical field of detection, and particularly relates to an experimental device for detecting an ODMR spectrum of a diamond NV color center based on a DAC device.

background

The DAC (diamond anvil cell) device is the only experimental device which can generate million atmospheric pressure static high pressure at present. The device combines the experimental techniques of the subordinate branches of the physical disciplines including electricity, optics, acoustics, thermophysics, magnetics and the like, and the technical means provide new ideas and experimental conditions for exploring the acquisition of new substances under high pressure, structural phase change of the substances, interception and prediction of high-pressure phase change, improvement of physical properties of materials, geoscience, occurrence of a material pressure-induced superconducting phenomenon and the like.

The diamond NV color center is used as an element with high sensitivity, and has extremely high application value in the fields of micro-displacement measurement, biological living body imaging, quantum computation, weak magnetic field detection and the like. At present, the preparation technology of the diamond NV color center and a normal-temperature and normal-pressure ODMR (optical detection magnetic resonance) detection means are mature, but the ODMR spectrum experiment means for detecting the diamond NV color center under the high-pressure condition based on a DAC (digital-to-analog converter) device is more and more complex, and the number of used components is more.

The ground state ³ a ₂ of the diamond NV colour centre is a triplet degenerate state consisting of the electron spins m _s ═ 0 and ± 1 order energy levels, when the electrons are de-excited from the ³ E excited state to the ³ a ₂ ground state, photons with energy E ═ 1.945eV are radiated, fluorescence with wavelength λ ═ 637nm is emitted, the diamond NV colour centre is irradiated with a microwave field at 532nm wavelength, it is found that around 2.87GHz, a magnetic dipole oscillation is formed between m _s ═ 0 and ± 1 order energy levels, and during de-excitation of the electrons from the excited state to the ground state, part of the energy is released in the form of a non-radiative transition, resulting in a fluorescence intensity at this time that is lower than when no microwave field is introduced, thus forming a photo-detection light resonance absorption peak corresponding to m _s ═ 1 electron spin resonance colour centre, i.e. diamond NV colour centre.

the principle that the ruby can be used for marking is that the ruby can emit fluorescence under laser irradiation, and the wavelength of the fluorescence can shift along with the pressure change, the ruby has two fluorescence lines which are respectively R ₁ and R ₂, the experiment generally adopts a R ₁ line, the position of the ruby fluorescence R ₁ is determined, and then the ruby fluorescence is brought into a pressure marking formula, so that the pressure value at the moment can be obtained.

The pressure transmission medium is used for transmitting the applied pressure to the sample, and quasi-static pressure is formed in the whole cavity. According to requirements, solid, liquid or gaseous substances can be selected as the pressure transmission medium, and different pressure transmission media can also have different influences on experimental results.

Disclosure of Invention

In view of this, the invention provides an experimental device for detecting an ODMR spectrum of a diamond NV color center based on a DAC device, which is used for acquiring an ODMR signal under a pressure condition, so as to promote the progress of a weak magnetic field detection technology and a superconducting detection technology under an extreme condition.

The scheme adopts the following scheme:

The experimental device for detecting the ODMR spectrum of the NV color center of the diamond based on the DAC device comprises the NV color center of the diamond, a focusing lens, a first reflecting mirror, a filtering lens, a collimating lens, a spectrometer, a second reflecting mirror, a beam expanding lens, a laser, a photoelectric detector, a microwave generator, an SMA port connecting wire, a power amplifier, a platinum wire, a copper wire, the DAC device, a gasket, a ruby and a signal collector;

A beam expanding lens, a second reflecting mirror, a first reflecting mirror, a focusing lens, a ruby and a diamond NV color center are sequentially arranged on a light path emitted by the laser; the beam expanding lens enlarges the beam diameter and the divergence angle of the laser; the directions of the first reflecting mirror and the second reflecting mirror are kept consistent when the ruby and the diamond NV color center are irradiated by laser so as to ensure that the directions of the first reflecting mirror and the second reflecting mirror are parallel to the direction of a laser beam; the ruby and the diamond NV color center are picked to the diamond anvil surface and then placed on a three-dimensional platform of a laser; the ruby and the diamond NV color center are sequentially placed at the focus of the focusing lens;

A focusing lens, a filtering lens, a collimating lens and a photoelectric detector are sequentially arranged on a light path of fluorescence emitted by the ruby and diamond NV color center, and the photoelectric detector is connected with a signal collector; fluorescence generated by the ruby and diamond NV color center enters a photoelectric detector through a focusing lens, a filtering lens and a collimating lens and is collected by a signal collector; the ODMR spectrum of the NV color center of the diamond is collected and recorded by a signal collector; the first reflector needs to be removed or the lens needs to be inverted before the fluorescence signal is collected; the collimating lens changes the fluorescence from the filtering lens into a parallel collimated beam;

The microwave generator is sequentially connected with the power amplifier and the copper wire through the SMA port connecting wire; microwave signals sent by the microwave generator are connected with the power amplifier through the SMA port connecting wire and then transmitted to the copper wire;

The wire is characterized by also comprising a platinum wire, wherein copper wires are connected with two ends of the platinum wire; the diamond NV colour centre is next to the platinum wire.

The laser wavelength emitted by the laser is 532 nm.

the focusing lens, the first reflecting mirror, the filtering lens, the collimating lens, the spectrometer, the second reflecting mirror, the beam expanding lens and the laser are positioned on the same horizontal table.

The DAC device needs to arrange two copper wires, and two copper wires are fixed on the diamond side edge with glue, and the terminal surface is cut into about 35. The length of the copper wire is as short as possible to reduce the loss in the microwave transmission process.

the DAC device includes an access port for allowing copper lines to pass through, the diameter of the copper lines being smaller than the diameter of the access port, an insulating layer on the outer layer, and an outlet terminal connected to ground.

The platinum wire is fixed with copper wires at two ends by silver paste, and then is heated to 150 ℃ in an oven, and the heating time lasts for about 30 minutes. The width of the platinum wire is ensured within 10-20 microns during cutting, and the length of the platinum wire can ensure connection with copper wires on two sides. The platinum wire crosses the center of the anvil surface of the diamond. The gasket is to be insulated from the platinum wire.

The diamond NV color center and the ruby are placed in a sample cavity of the pad, the pad is placed on the anvil face of the diamond, and the lower end of the pad is fixed by vacuum mud.

the signal collector adopts a program written by LabVIEW software.

the experimental process is as follows: laser emitted by the laser passes through the beam expanding lens and then is incident on the focusing lens through the two reflectors and then sequentially irradiates ruby and the diamond NV color center; fluorescence emitted by the ruby and the diamond NV color center sequentially passes through the focusing lens, the filtering lens and the collimating lens and enters the photoelectric detector to realize photoelectric signal conversion, and the signal collector is used for collecting signals. And after the signal acquisition is finished, the power switch of the microwave generator and the power amplifier is turned on. And an ODMR spectrum optical signal of the NV color center of the diamond enters the photoelectric detector after passing through the focusing lens, the filtering lens and the collimating lens to realize photoelectric signal conversion and is acquired by the signal acquisition device.

And after the group of signals are acquired, rotating the pressurizing column of the DAC device, and repeating the steps to obtain the ODMR spectrums under different pressure conditions.

the experimental device for detecting the ODMR spectrum of the NV color center of the diamond based on the DAC device, which is provided by the invention, has a simple structure and provides a new choice for detection of a superconducting phenomenon and the like.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an experimental flow chart of the apparatus of the present invention.

In the figure: the device comprises a diamond NV color center, a 2-focusing lens, a 3-reflector I, a 4-filtering lens, a 5-collimating lens, a 6-spectrometer, a 7-reflector II, an 8-beam expanding lens, a 9-laser, a 10-photoelectric detector, a 11-microwave generator, a 12-SMA port connecting wire, a 13-power amplifier, a 14-platinum wire, a 15-copper wire, a 16-DAC device, a 17-gasket, an 18-ruby and a 19-signal collector.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings.

As shown in fig. 1, the experimental apparatus for detecting an ODMR spectrum of a diamond NV color center based on a DAC device includes a diamond NV color center 1, a focusing lens 2, a first reflecting mirror 3, a filter lens 4, a collimating lens 5, a spectrometer 6, a second reflecting mirror 7, a beam expanding lens 8, a laser 9, a photodetector 10, a microwave generator 11, an SMA port connecting wire 12, a power amplifier 13, a platinum wire 14, a copper wire 15, a DAC device 16, a gasket 17, a ruby 18, and a signal collector 19.

A beam expanding lens 8, a second reflecting mirror 7, a first reflecting mirror 3, a focusing lens 2, a ruby 18 and a diamond NV color center 1 are sequentially arranged on a light path emitted by the laser 9; the beam expanding lens 8 enlarges the beam diameter and the divergence angle of the laser 9; the directions of the first reflecting mirror 3 and the second reflecting mirror 7 are kept consistent when the laser irradiates the ruby 18 and the diamond NV color center 1 so as to ensure that the directions of the first reflecting mirror and the second reflecting mirror are parallel to the direction of the laser beam; the ruby 18 and the diamond NV color center 1 are picked to the anvil surface of the diamond and then placed on a three-dimensional platform of a laser 9; the ruby 18 and the diamond NV color center 1 are sequentially placed at the focus of the focusing lens 2;

a focusing lens 2, a filter lens 4, a collimating lens 5 and a photoelectric detector 10 are sequentially arranged on the light path of fluorescence emitted by the ruby 18 and the diamond NV color center 1, and the photoelectric detector 10 is connected with a signal collector 19; fluorescence generated by the ruby 18 and the diamond NV color center 1 enters the photoelectric detector 10 through the focusing lens 2, the filtering lens 4 and the collimating lens 5 and is collected by the signal collector 19; the ODMR spectrum of the diamond NV color center 1 is collected and recorded by a signal collector 19; the first reflector 3 needs to be removed or the lens needs to be inverted before the fluorescence signal is collected; the collimating lens 5 changes the fluorescence from the filtering lens 4 into a parallel collimated beam;

The microwave generator 11 is sequentially connected with a power amplifier 13 and a copper wire 15 through an SMA port connecting wire 12; microwave signals sent by the microwave generator 11 are connected with the power amplifier 13 through the SMA port connecting wire 12 and then transmitted to the copper wire 15;

the wire drawing device also comprises a platinum wire 14, wherein copper wires 15 are connected with two ends of the platinum wire 14;

the diamond NV centre 1 is chosen to be near the platinum wire 14.

Two copper wires 15 are arranged at two ends of a diamond side edge in the DAC device 16, and the port is cut to about 35 degrees and then fixed by AB glue.

And after removing the shielding layer at the tail end of the SMA port connecting wire 12, fixing the SMA port connecting wire with the copper wire 15 at one end by using soldering tin, and connecting the tail end of the copper wire 15 at the other end with the shielding layer of the SMA port connecting wire 12.

A section of platinum wire 14 is connected to the copper wire 15 ports on two sides, and the ports are fixed by silver paste and then heated for 30 minutes by using an oven at a temperature point of 150 ℃. The platinum wire 14 is evenly divided into diamond anvil surfaces.

the spacers 17 are pressed in the DAC device 16, and then after the spacers are punched by a laser punch, a layer of insulating powder is pressed. Restoring to the original position of the gasket 17, picking the NV color center 1 of the diamond and the ruby 18 into a sample cavity of the gasket 17, and adopting silicon oil as a pressure transmission medium. The combined DAC device 16 is fixed by a pressurizing column. The focusing lens 2, the first reflecting mirror 3, the filtering lens 4, the collimating lens 5, the spectrometer 6, the second reflecting mirror 7, the beam expanding lens 8 and the laser 9 are positioned on the same horizontal table. The ruby 18 and the diamond NV color center 1 are sequentially placed at the focus of the focusing lens 2.

After the laser 9 is turned on, laser emitted by the laser 9 passes through the beam expanding lens 8, then enters the focusing lens 2 through the first reflecting mirror 3 and the second reflecting mirror 7, and then sequentially irradiates the ruby 18 and the diamond NV color center 1. The first reflecting mirror 3 and the second reflecting mirror 7 are placed in the same direction. Fluorescence generated by the ruby 18 and the diamond NV color center 1 sequentially enters the photoelectric detector 10 through the focusing lens 2, the filtering lens 4 and the collimating lens 5 and is collected by the signal collector 19;

The signal collector 19 adopts a program written by LabVIEW software. And after the switches of the microwave generator 11 and the power amplifier 13 are turned on, adjusting the three-dimensional platform of the laser 9, and enabling the laser focus to be located at the NV color center 1 of the diamond. And repeating the four steps. The ODMR spectrum signal of the diamond NV color center 1 sequentially enters the photoelectric detector 10 through the focusing lens 2, the filtering lens 4 and the collimating lens 5 and is collected by the signal collector 19; and then, continuously rotating the pressurizing column, and obtaining ODMR spectrums of the NV color center 1 of the diamond under different pressure values and corresponding pressure points according to the change of the peak position of the fluorescence peak of the ruby. The device avoids the use of complex components and the welding of related circuits, and is simple and easy to implement.

The above is an implementation of the measurement method, but is not limited thereto. Any simple changes and modifications made to solve substantially the same problems or technical effects on the basis of the present method are within the scope of the present method.