CN102183820B - Bidirectional curved surface core optical fiber micro-particle rotator - Google Patents
Bidirectional curved surface core optical fiber micro-particle rotator Download PDFInfo
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Abstract
The invention provides a bidirectional curved surface core optical fiber micro-particle rotator, which comprises two curved single-core optical fibers and micro-particles, wherein the curved single-core optical fibers are single-core optical fibers which can make an evanescent field on the surfaces of fiber cores transmit a cladding and of which the fiber cores on curved parts at least are close to the surface of the cladding; opposite ends of the two curved optical fibers are connected with a light source respectively; the two curved single-core optical fibers are symmetrically arranged and have the same curved radian; the micro-particles are positioned at a symmetrically central position of the two curved single-core optical fibers; and the micro-particles have a cylindrical upper body which is made of low-density materials and a helical bottom which is made of high-density materials and is provided with a plurality of wings. The invention has the advantages that: the rotator is small in volume, light in weight, simple in structure, low in cost, easy to operate, easy to package and fix, and the like, and the rotator is conveniently and manually operated. Moreover, the phenomenon of burning the micro-particles due to over-high power and the damage to solvent activity due to direct contact can be avoided, and the rotator has a wide application prospect in fields of biology and chemistry.
Description
Technical field
What the present invention relates to is a kind of fine particle spinner, specifically a kind of based on compound bending surface core fibre fine particle spinner.Utilize the evanscent field of curved surface core fibre and crooked rubbing down optical fiber to produce the rotation of optical radiation pressure-driven fine particle.
Background technology
In the last few years, micro-total analysis system (μ TAS) was also referred to as the laboratory that makes up on the single-chip and had started huge research tide at medical research, biologic applications analysis and chemical field.The spinner that is made up of fine particle serves as this vital role of stirrer in micro-fluidic system, therefore design and preparation fine particle spinner become also more and more important.In order to obtain more high performance spinner, people bring into use optical drive.
Light has the linear momentum that produces radiation pressure, and under certain condition, light also carries angular momentum, comprises spin angular momentum and orbital angular momentum.1936, R.A.Beth let the half-wave plate of a branch of circularly polarized light through filament suspension experimentally, utilized the angular momentum of photon in the light beam to realize the rotation of object first.The method that realizes photic rotation of exploring that people are not stopping always since then.Since people such as Askin in 1986 at Opt.Lett.11; 288-290 is last to publish an article, and " Observation of asingle-beam gradient force optical trap for dielectric particles has proposed " light tweezer " and has realized the three dimensions control to particle, has also promoted the development of photic rotation simultaneously.Up to the present realize the following several kinds of modes of the main employing of optical drive rotation: first kind of mode is to utilize spin angular momentum to realize rotation; Like document (Sugiura T; Kawata S; Minami S.Opticalrotation of small particles by a circularly-polarized laser beam in an optical microscope.JSpectroscSoc Jpn 1990 mentions in 39:342) and utilizes the circularly polarized light laser beam to affact birefringent material; The second way is to utilize orbital angular momentum to realize rotation; Like document (Sato S; Ishigure M; Inaba H.Optical trapping and manipulation ofmicroscopic particles and biological cells using higher-order mode Nd:YAG laserbeams.Electron.Lett., 1991, the higher order mode laser beam irradiation of a kind of non-homogeneous intensity of mentioning in 27:1831-1832); The third mode is to utilize the linear momentum of light to realize rotation; Design and produce microdevice with given configuration structure; Utilize device to interactions such as the reflection of light beam, refraction, absorption realize device rotation (wish stable, Liu Yuxiang, Guo Rui; Deng. a kind of Laser Processing of miniature rotor and photic rotation. photoelectric project .2006,33 (1): 10-13).Use the particulate of special shape such as windmill; Light beam itself does not carry angular momentum; Can be that linearly polarized light also can be a nonpolarized light; The similar wind windmill of the principle of its photic rotation rotates, thereby the light pressure of light field acts on and can produce moment of torsion on the particulate of windmill and make the particulate rotation, and its rotating speed is directly proportional with light intensity.The Ormos group of Hungary academy of sciences has done number of research projects in this respect.The advantage of this method is that the rotating speed and the direction of particulate can artificially be controlled, and shortcoming is the restriction that receives the shape of particulate, but along with the development of two-photon processing process technology, this experimental technique should use more flexible.Also have multiple methods cleverly such as two optical Fiber Method, two ligh trap method, interference zlasing mode method in addition, the ingenious part of these optics spinning solutions generally all is the selection of ligh trap zlasing mode and the design philosophy of light path, is still waiting further improvement and perfect.But all be to adopt laser to form the light tweezer to drive so far.Because the laser optical tweezer volume ratio is huger, be difficult for moving, we propose the high deficiency of cost compound bending surface core fibre and drive.
From S.Kawata in 1992 and T.Sugiura (S.Kawata and T.Sugiura; " Movement of micrometer-sizedparticles in the evanescent field of a laser beam; " Opt.Lett.17; 772-774,1992) proved for the first time can handle particulate with the evanscent field that prism produces after, obtained development progressively based on the particle manipulating of evanscent field.The evanescent wave that people utilize optical waveguide to produce is studied the operation of multiple particulate.(K.Grujic such as Grujic; O.G.
J.S.Wilkinson and J.P.Hole; " Optical propulsion of microspheres along a channel waveguide producedby Cs+ion-exchange in glass; " Opt.Commun.239; 227-235; 2004) particulate of the waveguide campaign made along the cesium ion exchange process is studied; Make the atom molecular adsorption on latex balloon and then can be handled by light field; And use the same method and made the waveguide of Y shape branched structure; Observe screening effeciency (K.Grujic, O.G.
J.S.Wilkinson, the J.P.Hole of branched structure through changing in the optical field distribution of multimode trunk waveguide to particulate; " Sorting of polystyrenemicrospheres using a Y-branched optical waveguide ", Optics Express 13 (2005) 1-7).(S.Gaugiran, S.G é tin, G.Colas such as Gaugiran; A.Fuchs, F.Chatelain, J.D é rouard; And J.M.Fedeli, " Opticalmanipulation of microparticles and cells on silicon nitride waveguides, " Opt.Express; Vol.13, pp.6956-6963, Sep.2005) they handle the red blood cell and the yeast cells of no memo; This is to be applied to this technology in the operation of biological cell first, and successfully red blood cell and the yeast cells speed with 1 μ m/s is advanced.In addition, (Allen H.J.Yang, Sean D.Moore such as Yang; Bradley S.Schmidt, Matthew Klug, Michal Lipson and DavidErickson. " Optical manipulation of nanoparticles and biomoleculesin sub-wavelength slotwaveguides "; Nature.Letters; Vol.457, pp.71-75 January.2009) adopts narrow slit wave-guide that the light of fine particle is handled and studies.This narrow slit wave-guide tapers to electromagnetic energy in the size of 60nm, overcomes the diffraction of light problem with this.And catch and transmitted dielectric nanosphere and the λ-dna molecular of 75nm in this way.Point than traditional is caught, and it is that line is caught that this method can be seen as, and therefore can directly operate the biomacromolecule of extending.And (Fang-Wen Sheu such as Shen; Hong-Yu Wu, and Sy-Hann Chen. " Using a slightly tapered optical fiber toattract and transport microparticles ", OPTICS EXPRESS; Vol.18; No.6, pp.5574-5579,2010) draw the evanscent field of the method generation of awl that particulate is handled through optical fiber.They pull into the conical fiber that the waist diameter is 50 μ m to the single-mode transmission optical fiber of 125 μ m diameters of a standard, after feeding 960m laser, can make the microballoon of 10 μ m produce motion.
Summary of the invention
The object of the present invention is to provide a kind of advantages such as volume is little, in light weight, simple in structure, cost is low, encapsulation easy to operate, easy is fixing that possess, can avoid because the compound bending surface core fibre fine particle spinner of direct contact damage solvent activity.
The objective of the invention is to realize like this:
Comprise two crooked single-core fibers and fine particle; Said crooked single-core fiber is that what can make that the evanscent field on fibre core surface transmits covering is the single-core fiber near cladding surface at the crooked position fibre core at least; Two curved fibers end in opposite directions are connected with light source respectively; Two crooked single-core fiber symmetry arrangement and crooked radian are identical; Fine particle is positioned at the symcenter position of two crooked single-core fibers, and the upper body of said fine particle is that a cylinder, the bottom that the less material of density is processed is the spiral fashion that has a plurality of wings that the bigger material of density is processed.
The present invention can also comprise:
1, said crooked single-core fiber is the curved surface single-core fiber.
2, the rubbing down surface core fibre of the said crooked single-core fiber standard single-mode fiber bending of after crooked certain radian, directly over fibre core, the fibre cladding rubbing down being processed to the zone that evanscent field exists.
3, the rubbing down surface core fibre of the eccentric optical fiber of the said crooked single-core fiber bending of after crooked certain radian, directly over fibre core, the fibre cladding rubbing down being processed to the zone that evanscent field exists.
4, the xsect of the covering rubbing down section of the surperficial core fibre of said rubbing down is similar in appearance to D shape, and the xsect of rubbing down part is not circular.
Utilize evanscent field optical acquisition and the optical system of controlling in miniflow drives, to embody bigger superiority.Because can not receive the restriction of laser spot size based on the evanscent field optical acquisition and the maneuvering area of the optical system of controlling; Only be subject to the scattering and the absorption loss of system, in addition, increased the integrated level of device; Reduced cost, device is developed towards the direction of high density, low cost.We can also utilize the bulk in high-index material control light field energy distributions zone, make it much smaller than the free space light wavelength, thereby realize catching and rotating of micro-nano particle.
What the invention provides a kind of novelty drives the spinner that fine particle constitutes based on compound bending surface core fibre; It has adopted by the rubbing down surface core fibre and the fine particle of two curved surface single-core fibers or two bendings and has formed, and in two curved fibers, injects light in opposite directions.Tradition is utilized the spinner that the Laser Driven particulate constitutes relatively; It possesses not only that volume is little, in light weight, simple in structure, low price, easy to operate, be prone to advantages such as encapsulation is fixing; And the advantage of in the environment of sealing, can carrying out that noncontact is controlled etc., also retouching operation position more easily, and to make things convenient for the people be the huge advantage of controlling to the zone with evanscent field utilization; Because the optical radiation power of utilizing the evanscent field of optical fiber to produce drives the particulate rotation; Avoided avoiding because directly the contact damage solvent is active, so be widely used in the biological and chemical field because the phenomenon of the excessive calcination particulate of power and system take noncontact to drive.
The ultimate principle that realizes the rotation of compound bending surface core fibre driving fine particle is because the structure of surperficial core fibre; Transmission light in the fibre core is radiate by fibre core; Form radiation field or evanscent field at optical fiber surface, formed optical gradient field, therefore near light field, can produce the field of force; The vector of power points to the luminous power maximal value from the luminous power minimum value; Thereby the fine particle that is in optical fiber surface can receive the effect of power, and it is suffered can be decomposed into the power of pointing to the fiber core center and along the power of optical propagation direction, these two power are exactly the power of catching and the propelling power that fine particle receives with joint efforts.Because two curved surface core fibres inject light acting in conjunction fine particle in opposite directions; Fine particle is received under the effect of four power; Vertical light direction of propagation stress balance; Rotate according to the similar wind windmill of the principle of photic rotation along optical propagation direction, thereby the light pressure of light field acts on and can produce moment of torsion on the particulate of windmill and make the particulate rotation, its rotating speed is directly proportional with light intensity.Relative optical propagation direction can make the moment of torsion stack, thereby obtains higher rotating speed.
The present invention has following advantage:
1, the invention provides a kind of based on compound bending surface core fibre fine particle spinner; It has adopted the power of the novel evanscent field generation that is formed by two curved surface single-core fibers or two crooked rubbing down surface core fibres that fine particle is driven; Relatively conventional laser drives little rotor arrangement, and it possesses, and volume is little, simple in structure, light weight, low price, big, the easy to operate retouching operation easily of operation degree of freedom position, realize the advantage that external control is captured and rotated.
2, the core fibre horizontal symmetrical distribution of compound bending surface makes and little agitator device lower surface level is easy to assembling, fixing.
3, because the optical radiation power that adopts evanscent field to produce drives the particulate rotation, its light beam can avoid the conventional laser drive unit because the excessive surface at little rotor of power produces the phenomenon of burning.
4, owing to adopt noncontact to drive, avoid because directly the contact damage solvent is active, so be widely used in the biological and chemical field.
5, the fine particle that utilizes the different densities material to process makes center of gravity in the bottom, thereby makes molecule uprightly float on a liquid, can the rotation of stabilized driving particle.
Description of drawings
Fig. 1 is based on compound bending surface single-core fiber fine particle spinner synoptic diagram;
Fig. 2 compound bending surface single-core fiber cross sectional representation;
Fig. 3 is based on compound bending rubbing down core shift optical fiber fine particle spinner synoptic diagram;
Fig. 4-1 is cross sectional representation to core fibre rubbing down front and back, Fig. 4-4 compound bending rubbing down surface, wherein: its cross sectional representation before Fig. 4-1 standard single-mode fiber rubbing down; Its cross sectional representation behind Fig. 4-2 standard single-mode fiber rubbing down; Its cross sectional representation before the eccentric optical fiber rubbing down of Fig. 4-3; Its cross sectional representation behind the eccentric optical fiber rubbing down of Fig. 4-4;
Fig. 5-1 is to Fig. 5-4 fine particle structural representation, wherein: Fig. 5-1 fine particle three-dimensional graph; Fig. 5-2 fine particle top view; Fig. 5-3 fine particle front view; Fig. 5-4 fine particle right view;
Fig. 6 light source tail optical fiber is aimed at synoptic diagram with the welding of surperficial single-core fiber or core shift optical fiber;
Fig. 7 is connected with the curved surface single-core fiber structural representation of light source tail optical fiber;
Fig. 8 becomes surperficial core fibre to connect light source tail optical fiber structural representation based on core shift optical fiber rubbing down.
Embodiment
For example the present invention is done description in more detail below in conjunction with accompanying drawing:
In conjunction with Fig. 1, shown in 2, first kind of embodiment of the present invention is made up of two curved surface single-core fibers 1 and fine particle 2, and two curved fibers end in opposite directions are connected with light source respectively, in two curved surface core fibres, inject light in opposite directions.Two crooked single-core fiber symmetry arrangement and crooked radian are identical, and fine particle is positioned at the symcenter position of two crooked single-core fibers.Combine Fig. 5-1 to Fig. 5-4 simultaneously, the upper body of said fine particle is that a cylinder, the bottom that the less material of density is processed is the spiral fashion that has a plurality of wings that the bigger material of density is processed.Because the structure of curved surface single-core fiber, the transmission light 3 in the fibre core transmits covering with the form of evanescent wave 4 and acts on the fine particle 2, and this part evanscent field that transmits produces the optical radiation pressure to fine particle 2 and forms torsional moments and realize rotation.
In conjunction with Fig. 3, Fig. 4-3, Fig. 4-4, second kind of embodiment of the present invention behind crooked rubbing down, forms crooked rubbing down surface core fibre by two eccentric optical fiber 5 and fine particle 2 is formed, and in two curved surface core fibres, inject light in opposite directions.The evanscent field that utilizes rubbing down zone 6 to form acts on the fine particle 2, and this part evanscent field that transmits produces optical radiation pressure to fine particle 2 and forms torsional moment realization rotation.
Shown in Fig. 3, Fig. 4-1, Fig. 4-2, the third embodiment of the present invention behind crooked rubbing down, forms crooked rubbing down surface core fibre by two standard single-mode fibers 7 and fine particle 2 is formed, and in two curved surface core fibres, injects light in opposite directions.The evanscent field that utilizes rubbing down zone 6 to form acts on the fine particle 2, and this part evanscent field that transmits produces optical radiation pressure to fine particle 2 and forms torsional moment realization rotation.
The composition of the optical fiber in the above-mentioned embodiment comprises fibre core 11 and covering 12.
Illustrate manufacturing process of the present invention below:
Manufacturing process 1:
1, the light source tail optical fiber is of coupled connections: get two section surface single-core fibers, respectively each end of two sections optical fiber carried out coat and dispel, cut, then in opposite directions an end aim at the single-mode fiber 8 of band light source tail optical fiber weld as shown in Figure 6.9 places are heated to soft state at solder joint shown in Figure 7, draw awl then, and carry out optical power monitoring, when the luminous power that is coupled to surperficial single-core fiber reaches maximum till;
2, packaging protection: the quartz ampoule of internal diameter overgauge optical fiber and surperficial single-core fiber is transferred to 10 places, coupled zone shown in Figure 7, utilize epoxy resin to fix, carry out secondary then and apply the completion Global Macros;
3, rotation particulate: the two section surface single-core fibers that will prepare, crooked according to equal angular, 20 microns of centre distances, horizontal symmetrical is arranged, and feeds light in opposite directions.
4, the processing of particulate: wherein the processing of fine particle is as shown in Figure 5, the model of designing institute demand in CAD at first, the application program that has designed according to CAD then; Be converted into the instruction that controller can be discerned, utilize the software control system of computing machine to control the break-make of the precise motion and the optical gate of three-dimensional shifting axle again, realize the selective processing of femtosecond laser; Behind this moment femtosecond laser collimation from microscope left side incident; Through after the mirror reflects, shown in the photosensitive resin that the speck mirror focuses on different densities by 100, photosensitive resin is positioned at surface of glass slide; Slide is fixed on the three-dimensional shifting axle; Thereby in photosensitive resin, make the 3 D stereo micro element, unexposed material is used dissolution with solvents, and just obtaining required curing three-dimensional microstructures is the fine particle that is designed.
Manufacturing process 2:
1, the light source tail optical fiber is of coupled connections: get two sections core shift optical fiber, respectively each end of two sections optical fiber carried out coat and dispel, cut, then in opposite directions an end aim at the single-mode fiber 8 of band light source tail optical fiber weld as shown in Figure 6.9 places are heated to soft state at solder joint shown in Figure 8, draw awl then, and carry out optical power monitoring, when the luminous power that is coupled to core shift optical fiber reaches maximum till;
2, packaging protection: the quartz ampoule of internal diameter overgauge optical fiber and core shift optical fiber is transferred to 10 places, coupled zone shown in Figure 8, utilize epoxy resin to fix, carry out secondary then and apply the completion Global Macros;
3, crooked rubbing down surface core fibre making: will be fixed on the glass matrix of opening arc shaped groove above one with epoxy glue respectively through two sections core shift optical fiber that connect the light source tail optical fibers that 1,2 steps prepare; Then with optical fiber therewith matrix on commercial optics polishing and burnishing machine, grind together; Rubbing down is to there being evanscent field 4 to form; After rubbing down finishes, need to dissolve epoxy glue with other chemical solvents.In like manner get other one section equal length optical fiber and do same treatment.The xsect in rubbing down zone 6 is a D shape, and the xsect in rubbing down zone is not circular.Behind two sections fibre-optical bending certain angles that pass through behind the rubbing down, rubbing down zone 6 relatively and horizontal arrangement on substrate of glass, blended rubber is fixed, and feeds light in opposite directions.
4, the processing of particulate: like step 4 in the manufacturing process 1.
Manufacturing process 3:
1, crooked rubbing down surface core fibre making: go two sections standard single-mode fibers 7 that have light source to be fixed on the glass matrix of opening arc shaped groove above one with epoxy glue respectively; Then with optical fiber therewith matrix on commercial optics polishing and burnishing machine, grind together; Rubbing down is to there being evanscent field 4 to form; After rubbing down finishes, need to dissolve epoxy glue with other chemical solvents.In like manner get other one section equal length optical fiber and do same treatment.The xsect in rubbing down zone 6 is a D shape, and the xsect in rubbing down zone is not circular.Behind two sections fibre-optical bending certain angles that pass through behind the rubbing down, rubbing down zone 6 relatively and horizontal arrangement on substrate of glass, blended rubber is fixed, and feeds light in opposite directions.
2, the processing of particulate: like step 4 in the manufacturing process 1.
Claims (5)
1. compound bending surface core fibre fine particle spinner; It is characterized in that: comprise two crooked single-core fibers and fine particle; Said crooked single-core fiber is that what can make that the evanscent field on fibre core surface transmits covering is the single-core fiber near cladding surface at the crooked position fibre core at least; Two curved fibers end in opposite directions are connected with light source respectively; Transmission light in the fibre core transmits covering with the form of evanescent wave and acts on the fine particle; This part evanscent field that transmits produces optical radiation pressure to fine particle and forms torsional moment realization rotation; Two crooked single-core fiber symmetry arrangement and crooked radian are identical, and fine particle is positioned at the symcenter position of two crooked single-core fibers, and the upper body of said fine particle is that a cylinder, the bottom that the less material of density is processed is the spiral fashion that has a plurality of wings that the bigger material of density is processed.
2. compound bending according to claim 1 surface core fibre fine particle spinner, it is characterized in that: said crooked single-core fiber is the curved surface single-core fiber.
3. compound bending according to claim 1 surface core fibre fine particle spinner is characterized in that: the rubbing down surface core fibre of said crooked single-core fiber standard single-mode fiber is processed the fibre cladding rubbing down directly over fibre core after crooked certain radian to the zone that evanscent field exists bending.
4. compound bending according to claim 1 surface core fibre fine particle spinner is characterized in that: the rubbing down surface core fibre of the eccentric optical fiber of said crooked single-core fiber is processed the fibre cladding rubbing down directly over fibre core after crooked certain radian to the zone that evanscent field exists bending.
5. according to claim 3 or 4 described compound bending surface core fibre fine particle spinners, it is characterized in that: the xsect of the covering rubbing down section of said rubbing down surface core fibre is similar in appearance to D shape, and the xsect of rubbing down part is not circular.
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| CN106094099A (en) * | 2016-06-13 | 2016-11-09 | 重庆大学 | Optical fiber optical tweezers based on four core Helical Fibers and preparation method thereof |
| CN107161943B (en) * | 2017-04-28 | 2019-05-31 | 浙江大学 | A kind of air environment luminous power driving micro-nano motor system based on micro-nano fiber |
| CN111007593B (en) * | 2019-05-12 | 2022-05-13 | 桂林电子科技大学 | Capillary optical fiber micro-particle transport device based on thermal diffusion melting and embedding core |
| CN110101390B (en) * | 2019-06-03 | 2023-11-07 | 呜啦啦(广州)科技有限公司 | Joint bidirectional bending measuring device |
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| 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 |
| CN101881858A (en) * | 2010-06-11 | 2010-11-10 | 哈尔滨工程大学 | Satellite-type helical multi-core fiber optical micro-tweezers capable of achieving rotation of small particles and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN101881858A (en) * | 2010-06-11 | 2010-11-10 | 哈尔滨工程大学 | Satellite-type helical multi-core fiber optical micro-tweezers capable of achieving rotation of small particles and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| A.Ashkin, et al.Observation of a single-beam gradient force optical trap for dielectric particles.《OPTICS LETTERS》.1986,第11卷(第5期),288-290. * |
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