CN107394573A - A kind of method for improving the generation of diamond NV colour centers photon and collection efficiency - Google Patents
A kind of method for improving the generation of diamond NV colour centers photon and collection efficiency Download PDFInfo
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- CN107394573A CN107394573A CN201710844947.4A CN201710844947A CN107394573A CN 107394573 A CN107394573 A CN 107394573A CN 201710844947 A CN201710844947 A CN 201710844947A CN 107394573 A CN107394573 A CN 107394573A
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- photon
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- optical fiber
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06716—Fibre compositions or doping with active elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094003—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
- Microscoopes, Condenser (AREA)
- Laser Surgery Devices (AREA)
Abstract
The invention discloses a kind of method for improving the generation of diamond NV colour centers photon and collection efficiency, it is to realize stimulation effect of the enhancing 532nm light fields to diamond NV colour centers using the local effect of hollow optic fibre, and the photon that NV colour centers are sent can be also bound in a fiber, and transmitted along optical fiber.Add a transmitting mirror by 532nm Laser feedback back into optical fibers in the other end of optical fiber in addition, while return in optical fiber and also have photon caused by diamond NV colour centers.The photon that diamond colour center so in optical fiber is sent will be collected along forward and backward, and the efficiency of collection can reach approximately 100%.The inventive method can realize higher photon collection efficiency, and the local effect due to optical fiber and the presence of feedback mechanism, and it only needs weaker 532nm laser to excite NV colour centers, there can be higher photon generation efficiency, structure is simpler, and operation is more convenient, and application prospect is more extensive.
Description
Technical field
The present invention relates to a kind of method for improving the generation of diamond NV colour centers photon and collection efficiency, this method has almost
100% collection efficiency, additionally have the advantages that output is stable, simple and compact for structure, be easily integrated.
Background technology
NV colour centers are a kind of luminescent spot defects in diamond crystal, and a nitrogen-atoms substitutes the carbon atom in diamond,
And there is a hole closing on position, such point defect is referred to as NV colour centers.Diamond NV colour centers are one very important
Physical system, especially for quantum techniques (including quantum tolerance, quantum information process, quantum communication etc.) and bio-imaging
It is widely used Deng field.In view of the application prospect of diamond NV colour centers in these areas, the research to it is always thing
The hot issue of pharmacological research.But under normal circumstances, the photon that the NV colour centers inside bulk diamond are sent only has seldom portion
Refraction can be occurred in diamond surface by dividing be collected by object lens, most of to be all totally reflected in diamond surface, therefore only very
A few part is collected and used.Under normal circumstances, the photon that the NV colour centers in block diamond are sent can utilize
The micro objective of high-NA is collected.But the photon that the NV colour centers inside bulk diamond are sent only has seldom one
Refraction can be occurred in diamond surface by dividing be collected by object lens, most of to be all totally reflected in diamond surface, it is impossible to by object lens
Collect, cause collection efficiency≤10% (object lens for utilizing maximum numerical aperture 1.49) for the photon that diamond NV colour centers send,
Coupling in view of detector and quantum efficiency simultaneously, the detection efficient of photon<2%.The serious limit of low photon collection efficiency
Application of the diamond NV colour centers in quantum information and quantum physics field is made.
In order to improve the collection efficiency of photon, traditional method is in bulk diamond table using means such as ion beam etchings
Face etches the shape of lens, or produces the means such as some special micro-nano structures using modern micro ＆ nano technology, but these
The realization device of method is very complicated, to the unusual height of requirement of experiment.A period of time, also some research groups report was sharp recently
Photon collection efficiency is improved with side collection technique (side-collection technique), this scheme make use of four
Individual photodetector collects the photon that NV colour centers emit from the surrounding of diamond sample, and collection efficiency has reached 47%, but
It is still relatively low, the also larger room for promotion of the efficiency of this method collection, and in order to improve photon collection efficiency needs
Use four photodetectors.
The content of the invention
In order to avoid the weak point present in above-mentioned prior art, the present invention is intended to provide a kind of improve diamond NV colors
Heart photon produces and the method for collection efficiency, to overcome traditional this extremely low NV colour center of diamond NV luminescence of color centers collection efficiencies
The shortcomings that fatal in application process.
The method that the present invention improves the generation of diamond NV colour centers photon and collection efficiency, utilized in diamond nano-particles
NV colour centers as luminescence medium, Nano diamond particle is strapped in hollow optic fibre, and combine feedback technique, utilized
532nm laser is realized and NV colour centers is excited, and can realize very high photon collection efficiency.
The method that the present invention improves the generation of diamond NV colour centers photon and collection efficiency, comprises the following steps：
1st, (can be according to Buddha's warrior attendant in required laser power intensity adjustment optical cement by Nano diamond particle and optical cement
The percentage of stone particle) it is well mixed after be injected into hollow optic fibre, fiber gain media is obtained after solidification；
The Nano diamond particle is 10nm the or 20nm diamond nano-particles of electron level.
2nd, 532nm exciting lights are incided and diamond NV colour centers therein, 532nm exciting lights is excited in fiber gain media
Gone out with caused photon from optical fiber fl transmission, 532nm exciting lights and the photon reflection for being gone out fl transmission using speculum
In back into optical fibers, 532nm exciting lights interact with diamond NV colour centers again, caused photon and the photon that is reflected back from
Optical fiber reverse transfers are gone out, and are transmitted into by dichroic mirror in wave filter, and the photon of device is collected by photodetector after filtering.
In step 2,532nm exciting lights need to pass twice through acousto-optic modulator to realize optics arteries and veins before inciding in optical fiber
Punching, passes twice through acousto-optic modulator (extinction ratio 106/ 1) compared with once-through acousto-optic modulator (extinction ratio 103/ 1) have more
High extinction ratio, it will be then injected into by the 532nm exciting lights of acousto-optic modulator twice in optical fiber and excite diamond NV colour centers.
The photon of reverse transfers can be directly collected, and the photon of fl transmission is fed back in back into optical fibers by speculum,
So the photon of forward direction can be also collected.This optical fiber source is based on above-mentioned mechanism, it is possible to achieve intimate 100% photon collection effect
Rate.
The present invention injects Nano diamond particle in hollow optic fibre, and the photon that diamond NV colour centers are sent can be in a fiber
Generation full transmitting, is transmitted along optical fiber, will not be leaked out from optical fiber, can be received from the photon of fiber port output
Collection, the photon that diamond colour center is sent can be almost collected completely.Can be by 532nm laser furthermore with optical feedback scheme
Stiffness of coupling between diamond NV colour centers increases to original 2 times, can reduce the intensity of 532nm exciting lights, realizes more
High converting photons efficiency.
The NV colour centers of diamond nano-particles electron spin tri-state (3A2With3E) and spin singlet (1A1With1E) such as Fig. 2.
Electron spin tri-state3A2→3E transition energies are excited using the laser of 450nm to 637nm wavelength, are all typically to utilize 532nm
Solid-state laser drive this transition.Photon that diamond NV colour centers are sent (3E→3A2The photon that transition is sent) wavelength model
It is 637nm-800nm to enclose.This optical fiber source sends photon using object lens to collect different from common diamond NV colour centers, this hair
It is bright to be sufficiently mixed Nano diamond particle and optical cement uniformly, and the mixture is injected in hollow optic fibre.It can so incite somebody to action
532nm exciting light incides and diamond NV colour centers therein is excited in optical fiber, and the local effect in optical fiber can strengthen 532nm
The interaction strength of laser and diamond NV colour centers.Other 532nm laser and caused photon transfer out from optical fiber, utilize
Speculum is reflected back towards in optical fiber, and 532nm laser can interact with diamond NV colour centers again, and this can be further
Strengthen the interaction strength of 532nm laser and diamond NV colour centers.It is in additionally, due to diamond in hollow optic fibre, it is produced
Photon can be transmitted along optical fiber, the photon of reverse transfers can be directly collected, and the photon of forward direction is fed back by speculum
In back into optical fibers, the photon of such forward direction can be also collected.This optical fiber source is based on above-mentioned mechanism, it is possible to achieve intimate 100%
Photon collection efficiency.
It can be used for realizing quantum sensor, particularly magnetometer using the optical fiber of this doped diamond NV colour centers.By
There is the photon collection efficiency higher than bulk diamond NV colour centers in the hollow optic fibre of this doped diamond NV colour centers, be used for
Realize that quantum sensor there can be higher measurement sensitivity.Therefore, this novel optical fiber based on doped diamond NV colour centers
Light source will have been widely used in the field such as quantum communications and quantum accurate measurement.
Beneficial effects of the present invention are embodied in：
This method realizes that enhancing 532nm light fields excite effect to diamond NV colour centers using the local effect of hollow optic fibre
Fruit, and the photon that NV colour centers are sent can be also bound in a fiber, and transmitted along optical fiber.We are in the another of optical fiber in addition
One end adds a transmitting mirror by 532nm Laser feedback back into optical fibers, while returns in optical fiber and also have diamond NV colour centers to produce
Photon.The photon that diamond colour center so in optical fiber is sent will be collected along forward and backward, the efficiency of collection
100% can be reached approximately.Compared with other schemes before, the present invention can realize higher photon collection efficiency, and
And the local effect due to optical fiber and the presence of feedback mechanism, it only needs weaker 532nm laser to excite NV colour centers, structure
Simpler, operation is more convenient, and application prospect is more extensive.
The present invention can allow 532nm exciting lights to be operated under relatively low power, realize that diamond NV colour centers send photon
Intimate 100% collection efficiency, and device is simple, system is stable, it is compact-sized, using it is convenient, be easily integrated the advantages that.
Brief description of the drawings
Fig. 1 is the diamond lattice structure for existing NV colour center defects.N represents nitrogen-atoms, and V represents hole, the ball of black
What is represented is carbon atom.
Fig. 2 is diamond NV colour center electronic energy level structures,3E and3A2It is electron spin tri-state respectively,1E and1A1Electronics from
Revolve singlet.
Fig. 3 is the light path schematic diagram of the inventive method.
Wherein 1：532nm solid state lasers (excite light field)；2：Polarization beam splitter；3 and 5：The lens of 300mm focal lengths；4：
Acousto-optic modulator；6 and 15：Speculum；7：Dichroic mirror；8：Wave filter；9：Photodetector；10 and 14：100mm focal lengths it is saturating
Mirror；11：Fiber gain media；12：3-dimensional displacement platform；13：Quarter-wave plate.
1：532nm solid state lasers (excite light field), are mainly used to excite the Nano diamond particle in hollow optic fibre.
2：Polarization beam splitter, it is split using the polarization difference of laser.
3 and 5：The lens of 300mm focal lengths, it is mainly used to be focused laser.
4：Acousto-optic modulator, it is mainly used to realize the speed-sensitive switch of light beam.
6 and 15：Speculum, mainly realize the total reflection of light beam.
7：Dichroic mirror, main function are to realize the total reflection to 532nm laser and the full impregnated to 600-850nm laser
Penetrate.
8：Wave filter, main function are to realize the filtering to 532nm laser.
9：Photodetector, detect the watt level of laser caused by the Nano diamond particle in hollow optic fibre.
10 and 14：The lens of 100mm focal lengths, it is mainly used to be focused laser.
11：Fiber gain media, this is mainly made up of the Nano diamond particle in hollow optic fibre, is used as new
Type light
The gain media in source.
12：3-dimensional displacement platform, it is mainly used to adjust the position of fiber gain media.
13：Quarter-wave plate, it is mainly used to adjust the polarization of laser.
Embodiment
Technical scheme is further analyzed and described with specific embodiment below in conjunction with the accompanying drawings.
The method that the present invention improves the generation of diamond NV colour centers photon and collection efficiency, utilized in diamond nano-particles
NV colour centers as luminescence medium, Nano diamond particle is strapped in hollow optic fibre, and combine feedback technique, utilized
532nm laser is realized and NV colour centers is excited, and can realize very high photon collection efficiency.
The present invention improves the generation of diamond NV colour centers photon and the method for collection efficiency is as follows：
1st, by Nano diamond particle and optical cement (according to diamond in required laser power intensity adjustment optical cement
The percentage of grain) it is well mixed after be injected into hollow optic fibre, fiber gain media is obtained after solidification, the both ends cutting of optical fiber is flat
It is whole；The Nano diamond particle is 10nm the or 20nm diamond nano-particles of electron level.
2nd, the 532nm exciting lights that 532nm solid state lasers 1 are sent are passed twice through into acousto-optic modulator 4 to realize optics arteries and veins
Punching, passes twice through acousto-optic modulator (extinction ratio 106/ 1) compared with once-through acousto-optic modulator (extinction ratio 103/ 1) have more
High extinction ratio.
3rd, will twice by acousto-optic modulator 4 532nm exciting lights be injected into fiber gain media 11 excite it is therein
Diamond NV colour centers, 532nm exciting lights and caused photon are gone out from optical fiber fl transmission, using speculum 15 by fl transmission
The 532nm exciting lights and photon gone out is reflected back in optical fiber, and 532nm exciting lights interact with diamond NV colour centers again, production
Raw photon and the photon being reflected back are gone out from optical fiber reverse transfers, are transmitted into by dichroic mirror 7 in wave filter 8, filtered
The photon of ripple device 8 is collected by photodetector 9.
The photon of reverse transfers can be directly collected, and the photon of fl transmission is fed back in back into optical fibers by speculum,
So the photon of forward direction can be also collected.This optical fiber source is based on above-mentioned mechanism, it is possible to achieve intimate 100% photon collection effect
Rate.
The present invention injects Nano diamond particle in hollow optic fibre, and the photon that diamond NV colour centers are sent can be in a fiber
Generation full transmitting, is transmitted along optical fiber, will not be leaked out from optical fiber, can be received from the photon of fiber port output
Collection, the photon that diamond colour center is sent can be almost collected completely.It can increase 532nm furthermore with optical feedback scheme to swash
Stiffness of coupling between light and diamond NV colour centers increases to original 2 times, can reduce the intensity of 532nm exciting lights, realizes
Higher converting photons efficiency.
Claims (4)
- A kind of 1. method for improving the generation of diamond NV colour centers photon and collection efficiency, it is characterised in that：It is to be received using diamond Nano diamond particle is strapped in hollow optic fibre as luminescence medium by NV colour centers in rice grain, and combines feedback technique, Realized using 532nm laser and NV colour centers are excited, to realize very high photon collection efficiency.
- 2. according to the method for claim 1, it is characterised in that comprise the following steps：Step 1：It is injected into after Nano diamond particle and optical cement are well mixed in hollow optic fibre, optical fiber is obtained after solidification and is increased Beneficial medium；Step 2：532nm exciting lights are incided diamond NV colour centers therein, 532nm exciting lights are excited in fiber gain media Gone out with caused photon from optical fiber fl transmission, 532nm exciting lights and the photon reflection for being gone out fl transmission using speculum In back into optical fibers, 532nm exciting lights interact with diamond NV colour centers again, caused photon and the photon that is reflected back from Optical fiber reverse transfers are gone out, and are transmitted into by dichroic mirror in wave filter, and the photon of device is collected by photodetector after filtering.
- 3. according to the method for claim 2, it is characterised in that：In step 1, the Nano diamond particle is 10nm the or 20nm diamond nano-particles of electron level.
- 4. according to the method for claim 2, it is characterised in that：In step 2,532nm exciting lights need to pass twice through acousto-optic modulator to realize optical pulse before inciding in optical fiber, It will be then injected into by the 532nm exciting lights of acousto-optic modulator twice in optical fiber and excite diamond NV colour centers.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108918485A (en) * | 2018-06-11 | 2018-11-30 | 华中科技大学 | Method for anti-counterfeit, corresponding drug, anti-counterfeiting ink and application based on Nano diamond |
| CN108957376A (en) * | 2018-05-18 | 2018-12-07 | 中北大学 | Chip type atomic spin Magnetic Sensor |
| CN109884013A (en) * | 2019-03-05 | 2019-06-14 | 中北大学 | The method for improving diamond NV colour center phosphor collection efficiency |
| CN110554332A (en) * | 2019-08-26 | 2019-12-10 | 华中科技大学 | Optical fiber magnetic field sensor and preparation method thereof |
| CN111896895A (en) * | 2020-08-04 | 2020-11-06 | 中国科学技术大学 | Probe structure of solid-state spin magnetic sensor |
| CN112296511A (en) * | 2020-09-30 | 2021-02-02 | 北京德弦科技有限公司 | Method for processing, reading and detecting miniature mark of gem and processing device |
| CN112485734A (en) * | 2020-09-27 | 2021-03-12 | 中国电子科技集团公司第十三研究所 | Method for improving fluorescence collection efficiency of NV color centers of diamonds |
| CN115327203A (en) * | 2022-08-19 | 2022-11-11 | 国网安徽省电力有限公司电力科学研究院 | Quantum current transformer based on bidirectional optical compensation technology |
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| US20090034737A1 (en) * | 2007-07-30 | 2009-02-05 | Magiq Technologies, Inc. | Diamond nanocrystal single-photon source with wavelength converter |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108957376A (en) * | 2018-05-18 | 2018-12-07 | 中北大学 | Chip type atomic spin Magnetic Sensor |
| CN108918485A (en) * | 2018-06-11 | 2018-11-30 | 华中科技大学 | Method for anti-counterfeit, corresponding drug, anti-counterfeiting ink and application based on Nano diamond |
| CN109884013A (en) * | 2019-03-05 | 2019-06-14 | 中北大学 | The method for improving diamond NV colour center phosphor collection efficiency |
| CN109884013B (en) * | 2019-03-05 | 2021-04-06 | 中北大学 | Method for improving fluorescence collection efficiency of NV color center of diamond |
| CN110554332A (en) * | 2019-08-26 | 2019-12-10 | 华中科技大学 | Optical fiber magnetic field sensor and preparation method thereof |
| CN111896895A (en) * | 2020-08-04 | 2020-11-06 | 中国科学技术大学 | Probe structure of solid-state spin magnetic sensor |
| CN112485734A (en) * | 2020-09-27 | 2021-03-12 | 中国电子科技集团公司第十三研究所 | Method for improving fluorescence collection efficiency of NV color centers of diamonds |
| CN112296511A (en) * | 2020-09-30 | 2021-02-02 | 北京德弦科技有限公司 | Method for processing, reading and detecting miniature mark of gem and processing device |
| CN115327203A (en) * | 2022-08-19 | 2022-11-11 | 国网安徽省电力有限公司电力科学研究院 | Quantum current transformer based on bidirectional optical compensation technology |
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