CN109212667A - The optical fiber optical tweezers probe with secondary cone angle prepared with two step method - Google Patents
The optical fiber optical tweezers probe with secondary cone angle prepared with two step method Download PDFInfo
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- CN109212667A CN109212667A CN201810996799.2A CN201810996799A CN109212667A CN 109212667 A CN109212667 A CN 109212667A CN 201810996799 A CN201810996799 A CN 201810996799A CN 109212667 A CN109212667 A CN 109212667A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/245—Removing protective coverings of light guides before coupling
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/262—Optical details of coupling light into, or out of, or between fibre ends, e.g. special fibre end shapes or associated optical elements
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
The invention discloses a kind of preparation methods of optical fiber optical tweezers probe for having secondary cone angle, the following steps are included: (1) static new lunar surface corrosion: the optical fiber for having stripped coat is rested on certain time in corrosive liquid, corrode completely to optical fiber, a cone angle probe molding；It is less than the confining liquid of corrosive liquid above corrosive liquid added with density；(2) transition zone corrodes: the intersection of confining liquid and corrosive acid forms transition zone, corrosion rate changes in gradient along the vertical direction in transition zone, after optical fiber forms a cone angle, continue to stand a period of time, the tip of a cone angle probe in transition zone forms second cone angle, after secondary cone angle molding, optical fiber is quickly proposed from corrosive liquid.The present invention has double tapered angle with the optical fiber probe that two step method obtains, and secondary cone angle is controllable in a big way, above can greatly improve optical fiber optical tweezers probe to the capture rate of particle in light capture application, and it is important that the contactless capture of particle may be implemented.
Description
Technical field
The present invention relates to optical fiber optical tweezers fields, and in particular to the sonde-type light with secondary cone angle prepared using two step method
Fine optical tweezer.
Background technique
Optical tweezer has just been applied to rapidly the various fields such as biology, medicine and physics since 1986 come out.1993
A.Constable et al. reports the optical optical tweezers system based on optical fiber for the first time, and realize fine particle seizes operation on both sides by the arms.Since then it
Afterwards, the development of optical fiber optical tweezers is very fast.The optical fiber structure being widely used at present is by executing special endface to optical fiber
Reason technology (such as grinding and polishing, hot-stretch and chemical attack) obtained needle-like structure.Sonde-type optical fiber optical tweezers have extremely strong
Space flexibility and extremely low insertion loss, can obtain higher capture rate, and realization manipulates particle from solution.Optical fiber is visited
Needle is also used in scanning near-field microscope, surfagauge, above Raman spectrometer simultaneously.
In sonde-type optical fiber optical tweezers, preparing for optical fiber probe is extremely important.The production method of optical fiber probe mainly has molten
Daraf(reciprocal of farad), etch, molten drawing-etch, laser ablation etc..It is relatively simple that chemical corrosion method prepares optical fiber probe process, efficiency
It is higher, favorable repeatability, the big cone angle optical tweezer of available controlled shape, thus it is more commonly used.But traditional chemical etch (
Claim Turner method or static new lunar surface etch) only one general cone angle of optical fiber probe of preparation, and also angle is little, exists more
Between 8 °~41 °.On the one hand the probe of this small-angle reduces the transmitance of laser power, on the other hand, catch when with it
When obtaining fine particle, the capture of contact will cause, easily damage particle especially biomone, can not embody the excellent of optical tweezer
Gesture.
If capturing particle using the optical fiber probe with double tapered angle, by regulating and controlling the size of secondary cone angle, on the one hand
Capture rate can be increased, non-contact capture on the other hand may be implemented, sufficiently show the Non-contact nondestructive wound manipulation of optical tweezer
Advantage.1998, Ci-Ling Pan et al. (Review of Scientific Instruments, 1998,69:437-439)
A kind of selective chemical etch of two steps is proposed to prepare the optical fiber probe of double tapered angle.Each step of this method uses
The corrosive liquid of different ratio requires to propose to reinsert again in another corrosive liquid by optical fiber so the corrosion of each step finishes,
Process is cumbersome, and needs to be accurately positioned the insertion position of optical fiber probe, and operation difficulty is larger.In this approach, if
The probe of different secondary cone angle is obtained, NH in careful control corrosion rate liquid is needed4The volume ratio of F.
Summary of the invention
The purpose of the present invention is to propose to be more convenient the light that simple two steps static state chemical corrosion method preparation has secondary cone angle
Fine optical tweezer probe.
The technical scheme adopted by the invention is that:
A kind of preparation method of optical fiber optical tweezers probe having secondary cone angle is provided, comprising the following steps:
(1) static new lunar surface corrosion: resting on certain time in corrosive liquid for the optical fiber for having stripped coat, complete to optical fiber
Full corrosion, a cone angle probe molding；It is less than the confining liquid of corrosive liquid above corrosive liquid added with density；
(2) transition zone corrodes: the intersection of confining liquid and corrosive acid forms transition zone, corrodes along the vertical direction in transition zone
Rate changes in gradient, after optical fiber forms a cone angle, continues to stand a period of time, a cone angle probe in transition zone
Tip forms second cone angle, and after secondary cone angle molding, optical fiber is quickly proposed from corrosive liquid.
Above-mentioned technical proposal is connect, the corrosive liquid is the HF acid of concentration 20%~40%.
Above-mentioned technical proposal is connect, the confining liquid is atoleine or isooctane.
Above-mentioned technical proposal is connect, the optical fiber is single mode or multimode silica fibre.
Above-mentioned technical proposal is connect, the optical fiber is the single mode optical fiber that cutoff wavelength is 920nm.
Above-mentioned technical proposal is connect, after optical fiber is stripped overlay, with the wiping fibre paper wiped clean for being moistened with dehydrated alcohol.
Above-mentioned technical proposal is connect, optical fiber quickly after proposing in corrosive liquid, is cleaned repeatedly with deionized water.
Above-mentioned technical proposal is connect, different types of confining liquid is replaced, a cone angle of different angle is obtained, then obtains not
With the probe of the secondary cone angle of angle.
It connects above-mentioned technical proposal, in transition zone corrosion process, changes transition zone etching time, obtain the secondary of different angle
Cone angle.
It is secondary the present invention also provides a kind of optical fiber optical tweezers probe of secondary cone angle of tool using the preparation of above-mentioned preparation method
Cone angle is formed on the basis of a cone angle, and the position of secondary cone angle is in fibre core, and the angle of secondary cone angle is greater than one
The angle of secondary cone angle.
The beneficial effect comprise that: the present invention prepares the optical fiber with secondary cone angle by two step etch
Optical tweezer probe at room temperature covers certain density corrosive agent with confining liquid, and the optical fiber pre-processed is inserted into corrosive agent,
The successively static new lunar surface corrosion of the experience first step and the corrosion of second step boundary layer, finally obtain optical fiber optical tweezers probe.Compared to list
The probe of cone angle, double tapered angle optical fiber optical tweezers probe prepared by the present invention have higher capture rate, may be implemented to particle
Contactless capture avoids the optical fiber probe contact capture bring particle damage problem of conventional chemical corrosion preparation.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 (a), Fig. 1 (b), Fig. 1 (c) are that present invention preparation has two steps used in the optical fiber optical tweezers probe of secondary cone angle
Method corrosion process schematic diagram；
Fig. 2 (a), Fig. 2 (b) are the optical fiber optical tweezers probe with secondary cone angle of the invention made in scanning electron microscope
(SEM) photo under；
Fig. 3 is that the optical fiber optical tweezers probe of the secondary cone angle of prepared by the method band captures the experimental system signal of particle
Figure；
Fig. 4 is that the optical fiber optical tweezers probe of the secondary cone angle of prepared by the method band captures the experiment photograph of yeast cell
Piece, wherein high-visible contactless capture.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
The present invention has the optical fiber optical tweezers probe of secondary cone angle using two step method production, and two step method i.e. two step etch are adopted
Optical fiber probe is prepared with the mode of static chemical attack.The process that chemical corrosion method prepares optical fiber probe is that optical fiber is put into corruption
Erosion solution is corroded, and organic solution of the density less than corrosive liquid can be added as confining liquid in corrosive liquid volatilization in order to prevent.Envelope
It closes liquid and does not generate chemical reaction with optical fiber.For the corrosive liquid that the present invention uses for the HF of concentration 40% acid, confining liquid is atoleine
Or isooctane.HF acid and fiber core (GeO2And SiO2), covering (SiO2) reaction chemical equation be respectively as follows:
SiO2+6HF-H2SiF6+2H2O (1)
GeO2+6HF-H2GeF6+2H2O (2)
The optical fiber insertion HF acid solution that coat will have been stripped, in HF acid, the interface of paraffin and optical fiber three, due to
The collective effect of adsorption capacity, surface tension and gravity will form lunate flexure plane, as shown in Fig. 1 (a).The height of new lunar surface
Degree H determines the length of probe tapered zone, namely determines taper angle theta of probe1Size:
The height of new lunar surface is then determined by the type of fibre diameter D and confining liquid.With the progress of corrosion, the size of optical fiber
It is gradually reduced, the height of new lunar surface is gradually lowered.When optical fiber is eroded completely, optical fiber is automatically disengaged with new lunar surface
Contact (new lunar surface height drops to zero at this time), this process is first step corrosion, and as shown in Fig. 1 (b), tool can be obtained at this time
The once optical fiber optical tweezers probe of cone angle.This process is also referred to as static new lunar surface corrosion.The size of cone angle is mainly closed
The influence of liquid type.In traditional chemical corrosion method, after new lunar surface corrosion process, probe has been formed, this time
Fibre should be extracted rapidly from corrosion, and be rinsed with deionized water.The optical fiber probe obtained in this way generally only has single
Cone angle, and cone angle is smaller (20 ° or so).
But in the present invention, after the first step etches, probe can't be extracted from corrosive liquid, and be to continue with
Keep its position constant, then execute second step --- transition zone corrosion: due to the intersection presence in confining liquid and corrosive acid
One transition zone of two-phase medium, the first step are corroded the probe tip to be formed and are exactly in transition zone.Due to the diffusion of HF acid
Effect will form a direction along HF concentration gradient straight down in transition zone.And the gradient of vertical direction HF acid concentration
Lead to the variable gradient of direction corrosion rate again (direction is downward).Since HF volatility is high, the thickness of transition zone is also bigger,
It about several microns, is just adapted to carry out anticaustic to the needle point position of probe.When probe rests in transition zone, vertically
Direction corrosion rate heterogeneous will will lead to the more top position of probe, and corrosion rate is slower, therefore corrode a period of time
After a biggish secondary cone angle can be formed on the basis of a cone angle, as shown in Fig. 1 (c) and Fig. 2 (a), 2 (b).?
During two steps, since new lunar surface completely disappears, so we are called transition zone corrosion.Theoretical analysis shows that transition zone corrodes
The secondary taper angle theta formed2It can indicate are as follows:
Wherein, T is the thickness of transition zone, and x is position of the tip in transition zone of probe, and v (x) is that probe is in position x
When corrosion rate, t2It is second step corrosion duration.It can be seen that control corrosion rate time t2An and taper angle theta1All it will affect
Secondary taper angle theta2。
The embodiment of the present invention using two step method prepares double tapered angle probe, and specific step is as follows:
(1) pretreatment of optical fiber.The present invention is applicable in single mode optical fiber or multimode silica fibre, uses cut-off in the present embodiment
The single mode optical fiber (125 μm of cladding diameter, about 4 μm of core diameter) of wavelength 920nm.The coating of optical fiber is peelled off with optical fiber wire stripper
Layer, and with the wiping fibre paper wiped clean for being moistened with dehydrated alcohol.Optical fiber is passed through hard sleeve and casing both ends hot wax are by light
Fibre is fixed, and optical fiber exposes lower end about 2cm long.
(2) first step is corroded: static new lunar surface corrosion.By the optical fiber pre-processed insertion HF acid, (atoleine is protected
Layer) in.The concentration of HF acid can be 20%~40%, and the present embodiment selects the HF acid of concentration 40%.Whole device be placed in one it is close
It in the plastic, transparent chest closed, and is placed on anti-vibration platform, to reduce the influence of environmental vibration and flow perturbation.This step is rotten
The erosion time is equal to optical fiber and corrodes required time completely.This time can be obtained by the measurement of fiber optical corrosive rate.Corrosion knot
Shu Hou, the cone angle molding of probe.Optical fiber continues to stand motionless, performs the next step rapid.
(3) second step corrodes: transition zone corrosion.Optical fiber rests on a preset time (i.e. formula 4 in transition zone
In t2) after, it is proposed from corrosive liquid rapidly, and cleaned repeatedly with deionized water.Then it observes under scanning electron microscope, such as schemes
Shown in 2a and 2b.Secondary cone angle it is high-visible (secondary cone angle realizes on the basis of a cone angle, and secondary cone angle be greater than it is primary
The angle of cone angle), and extend etching time t2, the secondary cone angle of gained will increase therewith.For example, under room temperature (19 DEG C), it is rotten
Lose time t2At=7 minutes, 17 minutes and 32 minutes, successively 38 °, 50 ° and 61 ° of secondary cone angle.
As application example of the double tapered angle optical fiber probe prepared by the present invention in optical tweezer, Fig. 3 gives double tapered angle optical fiber
The experimental system schematic diagram of optical tweezer probe capture particle.The optical maser wavelength of semiconductor laser output is 980nm.By optical splitter
It will be convenient for observation in 1% power access light power meter afterwards, and 99% power then passes through optical fiber connector and optical fiber probe end
Coupling, and operation is realized by D translation platform.Optical fiber probe is placed in the culture dish for diluting particle (saccharomycete).The culture
Ware is placed on microscopical objective table, and imaging results are observed in real time on computers by CCD.Operate translation stage probe is mobile
To near particle to be captured, laser light source is opened, yeast cell will be moved promptly into laser trap, finally by firmly
Capture near the needle point of probe, it is as shown in Figure 4 (video interception).Capture optical power 50mW in figure, 5 μm of saccharomycete diameter,
First and second cone angle of probe is 23 ° and 90 ° respectively.The contactless capture of high-visible particle in figure.Further measurement knot
Fruit shows that in capture rate, double tapered angle probe is doubled than single cone angle probe.A such as taper angle theta1=23 °, quadric cone
Angle θ2=48 ° of optical fiber probe is 133.4pN/W to the maximum capture rate of 5 μm of diameter of saccharomycete, and the list that cone angle is 23 °
The maximum capture rate of cone angle probe is 66.5pN/W.Therefore, the double tapered angle optical fiber probe prepared in the present invention not only realizes
The non-contact capture of particle, while also improving the capture rate of probe.
To sum up, the present invention has double tapered angle with the optical fiber probe that two step method obtains, and secondary cone angle in a big way may be used
Control above can greatly improve optical fiber optical tweezers probe to the capture rate of particle in light capture application, and it is important that can be real
The contactless capture of existing particle.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (10)
1. a kind of preparation method for the optical fiber optical tweezers probe for having secondary cone angle, which comprises the following steps:
(1) static new lunar surface corrosion: resting on certain time in corrosive liquid for the optical fiber for having stripped coat, completely rotten to optical fiber
Erosion, a cone angle probe molding；It is less than the confining liquid of corrosive liquid above corrosive liquid added with density；
(2) transition zone corrodes: the intersection of confining liquid and corrosive acid forms transition zone, corrosion rate along the vertical direction in transition zone
Change in gradient, after optical fiber forms a cone angle, continues to stand a period of time, the tip of a cone angle probe in transition zone
Second cone angle is formed, after secondary cone angle molding, optical fiber is quickly proposed from corrosive liquid.
2. preparation method according to claim 1, which is characterized in that the HF acid that the corrosive liquid is concentration 20%-40%.
3. preparation method according to claim 1, which is characterized in that the confining liquid is atoleine or isooctane.
4. preparation method according to claim 1, which is characterized in that the optical fiber is single mode or multimode silica fibre.
5. preparation method according to claim 1, which is characterized in that the optical fiber is the single mode that cutoff wavelength is 920nm
Optical fiber.
6. preparation method according to claim 1, which is characterized in that after optical fiber is stripped overlay, with being moistened with anhydrous second
The wiping fibre paper wiped clean of alcohol.
7. preparation method according to claim 1, which is characterized in that optical fiber quickly from corrosive liquid propose after, spend from
Sub- water cleans repeatedly.
8. preparation method according to claim 1, which is characterized in that replace different types of confining liquid, obtain different angles
Cone angle of degree, then obtains the probe of the secondary cone angle of different angle.
9. preparation method according to claim 1, which is characterized in that in transition zone corrosion process, change transition zone corrosion
Time obtains the secondary cone angle of different angle.
10. a kind of optical fiber optical tweezers of the secondary cone angle of tool of preparation method preparation according to claim 1 to 9 are visited
Needle, which is characterized in that secondary cone angle is formed on the basis of a cone angle, and the position of secondary cone angle is in fibre core, and two
The angle of secondary cone angle is greater than the angle of a cone angle.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109880744A (en) * | 2019-03-22 | 2019-06-14 | 华南师范大学 | Optofluidic cell sorting chip and its method for sorting cell |
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