CN104090329A - Fiber optical tweezers based on multimode fiber with gradually changing refraction index and using method thereof - Google Patents
Fiber optical tweezers based on multimode fiber with gradually changing refraction index and using method thereof Download PDFInfo
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- CN104090329A CN104090329A CN201410309680.5A CN201410309680A CN104090329A CN 104090329 A CN104090329 A CN 104090329A CN 201410309680 A CN201410309680 A CN 201410309680A CN 104090329 A CN104090329 A CN 104090329A
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Abstract
The invention provides a pair of fiber optical tweezers based on a multimode fiber with a gradually changing refraction index and a using method of the pair of fiber optical tweezers and belongs to the technical field of fibers. The pair of fiber optical tweezers comprises the multimode fiber with the gradually changing refraction index, a single-mode fiber, a glass capillary tube and a displacement platform for fixing the single-mode fiber. The single-mode fiber can be adjusted by the displacement platform to move in the axial direction, an air cavity is formed between the multimode fiber with the gradually changing refraction index and the single-mode fiber, the single-mode fiber can be made to move in the axial direction by adjusting the displacement platform, and thus the length of the air cavity is adjusted, and the capture distance of the fiber optical tweezers is adjusted. A smoothly cut end face is arranged at one end of the multimode fiber with the gradually changing refraction index, and a cone is arranged at the other end of the multimode fiber with the gradually changing refraction index. A smoothly cut end face is arranged at one end of the single-mode fiber. The end face of the multimode fiber with the gradually changing refraction index penetrates in and is fixed to one end of the glass capillary tube, and the end face of the single-mode fiber penetrates in the other end of the glass capillary tube. The pair of fiber optical tweezers is easy and convenient to operate and low in cost, and the capture distance can be adjusted.
Description
Technical field
The invention belongs to optical fiber technology field, be specifically related to a kind of optical fiber optical tweezers and using method thereof based on graded index multimode fiber cone.
Background technology
Light tweezer is that Askin proposed (Optics Letters in 1986,11 (5), 288-290,1986), its principle is that the convergent lens based on a large-numerical aperture forms a branch of high concentration light, near particulate convergent point is owing to being subject to larger gradient force, can overcome himself gravity and scattering force and is hunted down, and can carry out three-dimensional movement after catching.Because the mode that adopts on-mechanical contact is not caught and can be caused mechanical damage to particulate fine particle, in addition light has very strong penetrability to biological particle, thereby light tweezer is specially adapted to the research of biologically active particulate, and receive much attention with advantages such as its easy making and manipulations, be widely used in the various fields such as biology, instrument and chemistry.Traditional light tweezer adopts the object lens in the aperture of high numerical value, bulky, expensive, and whole system is difficult to mobile.The optical fiber optical tweezers technology of up-to-date fast development, utilizes the light field of light outgoing to form light tweezer, be important point of optical tweezer technology one of, there is the advantage such as small size and low cost, well solved the problem that traditional light tweezer exists.
Optical fiber optical tweezers uses the method for melting, stretching or chemical corrosion to be made, normally make based on single-mode fiber, but the core diameter of single-mode fiber is less than 10 microns, make these optical fiber optical tweezers that are made have following shortcoming: first, less core diameter is by the radius of the microprism at limit fibre tip, make focusing distance shorter, limited engagement range; The second, microprism need to be made into special shape at tip place increase the gradient force that focusing power and then increase are caught, and becomes very complicated by making to bore sharp manufacturing process.The 3rd, if the cone of single-mode fiber point most advanced and sophisticated have some defects or surface more coarse, easily cause the light being strapped in fibre core to be dispersed.Gong Y. etc. (Graded-index fiber tip optical tweezers:Numerical simulation and trapping experiment[J] .Optical Express, 2013,21 (13): 16181-16190) a kind of novel optical fiber light tweezer based on graded index multimode fiber has been proposed, with compared with single-mode fiber, have longer engagement range and larger gradient force, these 2 are the key parameter of optical fiber optical tweezers.In above-mentioned article, utilize the method for chemical corrosion to produce graded index multimode fiber tip, Success in Experiment has been caught yeast cells, has proved the feasibility of this kind of light tweezer.Application number is that 201010028052.1 Chinese invention patent has proposed a kind of single fiber optical tweezers manufacturing method based on corroded graded-index multimode fiber, the method can realize long range acquisition cell and manipulating cells, can make cell non-contacting fiber cone point, make cell more not be vulnerable to the damage causing because of contact, there is better activity, long range acquisition and operate in and have larger meaning on microscopic fields.But the method is made optical fiber optical tweezers and is had strict requirement for the length of graded index multimode fiber cone, and for same graded index multimode fiber cone, only have an engagement range, do not possess the function that regulates engagement range, poor in repeatability, operability and applicability.
Summary of the invention
The present invention is directed to the defect that background technology exists, a kind of optical fiber optical tweezers and using method thereof based on graded index multimode fiber cone is provided.Between the graded index multimode fiber of this optical fiber optical tweezers and single-mode fiber, there is an adjustable air chamber, can pass through the engagement range of this optical fiber optical tweezers of length adjustment that regulates this air chamber, easy and simple to handle, reproducible, can realize engagement range adjustable, reduce cost of manufacture.
A kind of optical fiber optical tweezers based on graded index multimode fiber cone, comprise graded index multimode fiber 2, single-mode fiber 3, glass capillary 1, it is characterized in that, described optical fiber optical tweezers also comprises the displacement platform 4 of fixing single-mode fiber, the adjustable single-mode fiber of described displacement platform moves vertically, between described graded index multimode fiber and described single-mode fiber, there is an air chamber 5, regulating displacement platform can realize single-mode fiber moves vertically, and then the length of adjusting air chamber, thereby the engagement range of adjusting optical fiber optical tweezers; One end of described graded index multimode fiber is the smooth end face of cutting, the other end is cone, one end of described single-mode fiber is the smooth end face of cutting, the end face of described graded index multimode fiber penetrates and is fixed on one end of described glass capillary, and the end face of described single-mode fiber penetrates the other end of described glass capillary.
The length of the air chamber between wherein said graded index multimode fiber and single-mode fiber is 1～500 micron.The cone angle of described graded index multimode fiber other end cone is 20 °～70 °.
Further, the internal diameter of described glass capillary is 126 microns, and length is more than 10 millimeters; External diameter is greater than 1 millimeter, and glass capillary has certain physical strength like this, does not bend or fracture in operating process; The two ends of described glass capillary are bell-mouth structure of air, are convenient to fiber end face and penetrate wherein.
A method for making for optical fiber optical tweezers based on graded index multimode fiber cone, specifically comprises the following steps:
Step 1: adopt chemical corrosion method that the cone of cone angle between 20 °～70 ° is processed into in one end of graded index multimode fiber, obtain graded index multimode fiber cone, other end cutting is smooth, obtains graded index multimode fiber end face;
Step 2: graded index multimode fiber end face is penetrated and is fixed in glass capillary; By smooth one end cutting of single-mode fiber, obtain the end face of single-mode fiber, the end face of single-mode fiber is penetrated to the other end of glass capillary; Between the end face of single-mode fiber and the end face of graded index multimode fiber, leave an air chamber, the other end of single-mode fiber is fixed on displacement platform.
Wherein, the detailed process that one end of graded index multimode fiber is processed into cone by employing chemical corrosion method described in step 1 is: first, graded index multimode fiber coat is divested, clean with alcohol, at room temperature, it is 40% hydrofluoric acid solution that massfraction is vertically put into in one end of graded index multimode fiber after cleaning, then at hydrofluoric acid solution surface coverage one deck dimethylbenzene, prevents hydrofluorite volatilization; After 1～1.5h, the part of optical fiber below corrosion liquid level is corroded, and on corrosive liquid surface, due to the effect of liquid level tension force, one end of optical fiber is etched into cone, obtains graded index multimode fiber cone; Finally, with washed with de-ionized water graded index multimode fiber cone obtained above, remove corrosive liquid remaining on optical taper, dry up or dry stand-by.
The internal diameter of the glass capillary described in step 2 is 126 microns, and length is more than 10 millimeters; External diameter is greater than 1 millimeter, and glass capillary has certain physical strength like this, does not bend or fracture in operating process; The two ends of described glass capillary are bell-mouth structure of air, are convenient to fiber end face and penetrate wherein.
Graded index multimode fiber described in step 2 and glass capillary use glue when fixing; What when single-mode fiber described in step 2 is fixed on displacement platform, use is transparent adhesive tape.
The length of the air chamber between the single-mode fiber end face described in step 2 and graded index multimode fiber end face is 1～500 micron.
A using method for optical fiber optical tweezers based on graded index multimode fiber cone, comprises the following steps:
Steps A: beam of laser is coupled into single-mode fiber, and through air chamber and graded index multimode fiber, output light field forms light tweezer;
Step B: regulate displacement platform 4, the relative glass capillary of single-mode fiber is moved axially, regulate the length of air chamber, thereby regulate the engagement range of optical fiber optical tweezers.
Beneficial effect of the present invention is:
1, the present invention utilizes the surface tension of hydrofluorite corrosive liquid that cone is corroded into in one end of graded index multimode fiber, can improve the repeatability of operation; Meanwhile, the graded index multimode fiber itself that the present invention adopts with self-focusing effect, can strengthen the convergent effect of light field, form larger gradient force, more easily form light tweezer.
2, in smooth tweezer of the present invention, between single-mode fiber end face and graded index multimode fiber end face, there is air chamber, can, by regulating air chamber to regulate the engagement range of optical fiber optical tweezers, can realize the operation particulate samples that long-distance nondestructive is hindered.
3, the method for making optical fiber optical tweezers provided by the invention is easy and simple to handle, and cost is low, can make in enormous quantities, can regulate engagement range, and easy damaged particulate not.
Brief description of the drawings
Fig. 1 is the structural representation of optical fiber optical tweezers provided by the invention.
Fig. 2 is the transmission path of light and the geometrical optics schematic diagram of outgoing beam of optical fiber optical tweezers of the present invention.
Fig. 3 is the structural representation of optical fiber optical tweezers system.
Fig. 4 adopts optical fiber optical tweezers of the present invention to catch the relation curve apart from discrete time of cell.
Fig. 5 is the relation curve that the length of the air chamber of optical fiber optical tweezers provided by the invention affects engagement range.
Wherein, 1: glass capillary, 2: graded index multimode fiber, 3: single-mode fiber, 4: displacement platform, 5: air chamber, 6: stablize capture point, 7: cell, 8: laser instrument, 9: cell solution drop, 10: microscope stage, 11: microscopic system, 12: computing machine
Embodiment
Making and the using method of optical fiber optical tweezers based on graded index multimode fiber cone, specifically comprise the following steps:
(1) at room temperature, it is 125 microns by cladding diameter, core diameter is that the graded index multimode fiber coat of 62.5 microns divests, clean cladding surface with alcohol, the hydrofluoric acid solution that 50 milliliters of massfractions are 40% is vertically put into in one end of graded index multimode fiber after cleaning, then at hydrofluoric acid solution surface coverage one deck dimethylbenzene, prevent hydrofluorite volatilization;
(2) after 1.5 hours, the part of optical fiber below corrosion liquid level is corroded, on corrosive liquid surface, due to the effect of liquid level tension force, one end of optical fiber is etched into cone, obtains graded index multimode fiber cone, uses washed with de-ionized water optical taper, remove corrosive liquid remaining on optical taper, dry stand-by;
(3) by smooth the other end cutting of graded index multimode fiber, obtain fiber end face, examine under a microscope fiber end face, determine that fiber end face penetrates in glass capillary after smooth, and smear glass capillary port with 502 glue, graded index multimode fiber end face is fixed in glass capillary;
(4) it is 125 microns by cladding diameter, core diameter is that one end cutting of the single-mode fiber of 5.8 microns obtains single-mode fiber end face, examine under a microscope fiber end face, determine that end face penetrates the other end of glass capillary after smooth, leaves an air chamber between the end face of single-mode fiber and the end face of graded index multimode fiber;
(5) glass capillary is fixed on microscope stage, then single-mode fiber is fixed on displacement platform 4 with transparent adhesive tape;
(6), when beam of laser is coupled into single-mode fiber, through air chamber and graded index multimode fiber, output light field forms light tweezer;
(7) regulate the displacement platform 4 of fixing single-mode fiber, the relative glass capillary of single-mode fiber is moved axially, regulate the length of air chamber, thereby regulate the engagement range of optical fiber optical tweezers.
Fig. 2 is the transmission path of light in graded index multimode fiber and the geometrical optics schematic diagram of outgoing beam.According to theory of geometric optics, the convergence of light meeting generating period in graded index multimode fiber, the graded index multimode fiber of making by above-mentioned corrosion process cone, makes outgoing light field high concentration, forms light tweezer.As shown in Figure 2, when the converging light field action of optical taper output is during in cell 7, under the effect of light tweezer power, cell 7 will be bound in 6 regions at the stable point of catching.
Fig. 3 is the structural representation of optical fiber optical tweezers system.The embodiment of the present invention adopts 980 nano laser 8 excitation fiber light tweezers, the laser that laser instrument 8 is exported connects and enters in glass capillary 1 through general single mode fiber 3, spread into graded index multimode fiber 2 through air chamber, optical taper is caught cell in cell solution drop 9, and 9 of cell solution drops are positioned on the glass sheet of microscope stage 10.Optical fiber optical tweezers is caught the process of manipulation microballoon by optical observation system Real-Time Monitoring, and recording geometry is connected to form by microscope 11 and computing machine 12, is convenient to show and record.Single-mode fiber is fixed on displacement platform 4, by regulating the displacement platform 4 of fixing single-mode fiber, the relative glass capillary of single-mode fiber is moved axially, and regulates the length of air chamber, thereby regulates the engagement range of optical fiber optical tweezers.In sample drop 9, successfully caught at a distance by the way cell, cell capture as Fig. 4, can find out that cell is captive very little apart from temporal evolution apart from the graph of a relation of discrete time, be substantially stablize motionless.By changing the length of air chamber 5, can make the distance of catching change, the relation of engagement range and air chamber length is as shown in Figure 5.
Claims (8)
1. the optical fiber optical tweezers based on graded index multimode fiber cone, comprise graded index multimode fiber (2), single-mode fiber (3), glass capillary (1), it is characterized in that, described optical fiber optical tweezers also comprises the displacement platform (4) of fixing single-mode fiber, the adjustable single-mode fiber of described displacement platform moves vertically, has an air chamber (5) between described graded index multimode fiber and described single-mode fiber; One end of described graded index multimode fiber is the smooth end face of cutting, the other end is cone, one end of described single-mode fiber is the smooth end face of cutting, the end face of described graded index multimode fiber penetrates and is fixed on one end of described glass capillary, and the end face of described single-mode fiber penetrates the other end of described glass capillary.
2. the optical fiber optical tweezers based on graded index multimode fiber cone according to claim 1, is characterized in that, the length of the air chamber between described graded index multimode fiber and single-mode fiber is 1～500 micron.
3. the optical fiber optical tweezers based on graded index multimode fiber cone according to claim 1, is characterized in that, the cone angle of described graded index multimode fiber other end cone is 20 °～70 °.
4. the optical fiber optical tweezers based on graded index multimode fiber cone according to claim 1, it is characterized in that, the internal diameter of described glass capillary is 126 microns, and length is more than 10 millimeters, external diameter is greater than 1 millimeter, and the two ends of described glass capillary are bell-mouth structure of air.
5. a method for making for the optical fiber optical tweezers based on graded index multimode fiber cone, specifically comprises the following steps:
Step 1: adopt chemical corrosion method that the cone of cone angle between 20 °～70 ° is processed into in one end of graded index multimode fiber, obtain graded index multimode fiber cone, other end cutting is smooth, obtains graded index multimode fiber end face;
Step 2: graded index multimode fiber end face is penetrated and is fixed in glass capillary, by smooth one end cutting of single-mode fiber, obtain the end face of single-mode fiber, the end face of single-mode fiber is penetrated to the other end of glass capillary, between the end face of single-mode fiber and the end face of graded index multimode fiber, leave an air chamber, the other end of single-mode fiber is fixed on displacement platform.
6. the method for making of the optical fiber optical tweezers based on graded index multimode fiber cone according to claim 5, it is characterized in that, the detailed process that one end of graded index multimode fiber is processed into cone by employing chemical corrosion method described in step 1 is: first, graded index multimode fiber coat is divested, clean with alcohol, at room temperature, it is 40% hydrofluoric acid solution that massfraction is vertically put into in one end of graded index multimode fiber after cleaning, then at hydrofluoric acid solution surface coverage one deck dimethylbenzene; After 1～1.5 hour, the part of optical fiber below corrosion liquid level is corroded, and on corrosive liquid surface, due to the effect of liquid level tension force, one end of optical fiber is etched into cone, obtains graded index multimode fiber cone; Finally, with washed with de-ionized water graded index multimode fiber cone obtained above, dry up or dry stand-by.
7. the method for making of the optical fiber optical tweezers based on graded index multimode fiber cone according to claim 5, is characterized in that, the length of the air chamber between the single-mode fiber end face described in step 2 and graded index multimode fiber end face is 1～500 micron.
8. a using method for the optical fiber optical tweezers based on graded index multimode fiber cone, comprises the following steps:
Steps A: beam of laser is coupled into single-mode fiber, and through air chamber and graded index multimode fiber, output light field forms light tweezer;
Step B: regulate displacement platform (4), the relative glass capillary of single-mode fiber is moved axially, regulate the length of air chamber, thereby regulate the engagement range of optical fiber optical tweezers.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105068238A (en) * | 2015-08-21 | 2015-11-18 | 电子科技大学 | Stress adjustable optical fiber optical control system based on graded-index multimode fiber |
| CN107357044A (en) * | 2017-08-28 | 2017-11-17 | 重庆三峡医药高等专科学校 | A kind of step multimode fibre optical tweezer based on skew ray annular light field |
| CN108267231A (en) * | 2018-03-19 | 2018-07-10 | 浙江师范大学 | High-capacity optical fiber laser power and SBS threshold on-Line Monitor Device |
| CN109116473A (en) * | 2018-07-16 | 2019-01-01 | 哈尔滨工程大学 | A kind of optical drive rotating device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100447603C (en) * | 2006-12-01 | 2008-12-31 | 哈尔滨工程大学 | Melting and pulling method for manufacturing optical tweezers of parabolic microstructure single fiber |
| CN100507620C (en) * | 2007-08-08 | 2009-07-01 | 哈尔滨工程大学 | Small core diameter ultra-high numerical aperture cone optical fiber optical tweezers and manufacturing method thereof |
| US8215848B1 (en) * | 2009-05-12 | 2012-07-10 | The Boeing Company | Methods and apparatus for making connections between optical fibers and optical components |
| CN101852890A (en) * | 2010-01-08 | 2010-10-06 | 电子科技大学 | Single fiber optical tweezers manufacturing method based on corroded graded-index multimode fiber |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105068238A (en) * | 2015-08-21 | 2015-11-18 | 电子科技大学 | Stress adjustable optical fiber optical control system based on graded-index multimode fiber |
| CN105068238B (en) * | 2015-08-21 | 2017-05-17 | 电子科技大学 | Stress adjustable optical fiber optical control system based on graded-index multimode fiber |
| CN107357044A (en) * | 2017-08-28 | 2017-11-17 | 重庆三峡医药高等专科学校 | A kind of step multimode fibre optical tweezer based on skew ray annular light field |
| CN108267231A (en) * | 2018-03-19 | 2018-07-10 | 浙江师范大学 | High-capacity optical fiber laser power and SBS threshold on-Line Monitor Device |
| CN109116473A (en) * | 2018-07-16 | 2019-01-01 | 哈尔滨工程大学 | A kind of optical drive rotating device |
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