CN109254346A - A kind of single fiber optical tweezers based on wavelength-division multiplex technique - Google Patents
A kind of single fiber optical tweezers based on wavelength-division multiplex technique Download PDFInfo
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- CN109254346A CN109254346A CN201810808621.0A CN201810808621A CN109254346A CN 109254346 A CN109254346 A CN 109254346A CN 201810808621 A CN201810808621 A CN 201810808621A CN 109254346 A CN109254346 A CN 109254346A
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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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02295—Microstructured optical fibre
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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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02042—Multicore optical fibres
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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
- G02B6/255—Splicing of light guides, e.g. by fusion or bonding
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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
- G02B6/255—Splicing of light guides, e.g. by fusion or bonding
- G02B6/2551—Splicing of light guides, e.g. by fusion or bonding using thermal methods, e.g. fusion welding by arc discharge, laser beam, plasma torch
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
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- Optics & Photonics (AREA)
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- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
A kind of single fiber optical tweezers based on wavelength-division multiplex technique, belong to optical fiber optical tweezers technical field.Including tunable optical fibre source (1), special optical fiber (2), capillary fiber (3)；The tail optical fiber of tunable optical fibre source (1) is connect with special optical fiber (2), special optical fiber (2) other end and capillary fiber (3) are welded, and truncated cone probe (3 ') is made using end face micro-processing technology in the other end of capillary fiber (3).Change the wavelength of tunable optical source (1) emergent light, form the higher order mode light beam (33) for gathering the different location before optical fiber probe, to accurately manipulate the position of trapped particle.The adjusting of the axial trapping position based on wavelength-division multiplex technique may be implemented in the present invention, different location before change light source output wavelength makes emergent light converge in optical fiber probe forms ligh trap and trapped particle, structure is simple, easy to operate, manipulates fine particle for fields such as biomedicines and provides new tool.
Description
Technical field
The invention belongs to optical fiber optical tweezers technical fields, and in particular to a kind of single fiber optical tweezers based on wavelength-division multiplex technique.
Background technique
Optics was proposed in [Optical Letters, 18 (5): 288-290,1986] since Ashkin etc. 1986
Tweezers, optical tweezers have been widely used for the operation of micron and nano-sized particles.Optical tweezers can produce force trapping and to life
Object cell etc. carries out microoperation, and in biology, physics, the fields such as chemistry are widely used.Optical tweezers can be divided into two classes: one
Kind is traditional optical tweezer of the micro objective based on high-NA, and traditional optical tweezer is that laser beam is passed through to the light of high-NA
Lens focus is learned, forms it into the hot spot of a high order focusing to generate trapping stiffness, the experimental provision of traditional optical tweezer is often
Bulky and hulking and operating distance of uniting is small, expensive, so that it has very big limitation in practical application；Another kind is to be based on
The novel optical fiber optical tweezer of optical fiber, optical fiber optical tweezers preparation process is simple, and low manufacture cost is easy to operate, and operating distance is long, optics light
The working light path of tweezer is independent from each other with observation optical path, i.e., does not influence when carrying out any angle observation to captured particle to quilt
Capture the operation of particle.
Optical fiber optical tweezers have obtained extensive concern and research in recent years, and initial single fiber optical tweezers can only be controlled and be moved single
Particle.Have researcher propose it is a kind of based on single mode optical fiber single fiber multiple light forceps [Chinese Physi-cs B, 23 (8):
088702,2014], the capture of multiple particles may be implemented.But since single mode optical fiber core diameter is small, so that production fiber tip
Program is complicated when the lens for being used to converge emergent light at end and repeatability is low, and in addition the optical fiber optical tweezers can only realize multiple particles
Contact capture, and can not achieve to other operations such as the adjustment of captured particle position, rotation.There is within 2013 researcher to propose one
Single fiber optical tweezers [Optics letters, 2013,38 (14): 2617-2620] of the kind based on mode division multiplexing technology, which can
To pass through the communication mode for the light beam being introduced into mode selector change optical fiber and it made to converge at different location to reach micro-
Adjust the purpose of captured particle position.Cholesteric phase liquid is filled into the hollow-core fiber with multiple fibre core holes in addition there are researcher
Crystalline substance finely tunes particle position [Chinese patent CN106094098A] by changing input light intensity.These light forceps device structures are multiple
It is miscellaneous, it is not easy to practical operation and application.
Summary of the invention
The purpose of the present invention is to provide a kind of single fiber optical tweezers based on wavelength-division multiplex technique.List based on wavelength-division multiplex
Optical fiber optical tweezers can stablize the multiple particles of capture, can be adjusted axially multiple particles positions, be changed by changing the wavelength of input light
Become the spot size and shape of the higher order mode light beam of output, so that output beam be made to converge at optical fiber by truncated cone cone
Different location before probe, and then realize the capture of multiple particles and the optical fiber axial direction catch position adjustment of multiple particles.
The object of the present invention is achieved like this:
A kind of single fiber optical tweezers based on wavelength-division multiplex technique, including tunable optical fibre source 1, special optical fiber 2, capillary
Optical fiber 3；The tail optical fiber of tunable optical fibre source 1 is connect with special optical fiber 2, and 2 other end of special optical fiber and capillary fiber 3 weld,
Truncated cone probe 3 ' is made using end face micro-processing technology in the other end of capillary fiber 3.
The present invention may also include:
1, special optical fiber 2 can be multi-core optical fiber (each fibre core is with optical fiber main shaft apart from identical, fibre core number >=2) or toroidal cores
Optical fiber, and fibre core and optical fiber main shaft spacing r1 should be greater than capillary fiber internal diameter r2.
2, the preparation of conical tip 3 ' using fiber end face micro-processing technology realize, the cone angle range of work be 10 °~
Between 80 °.
The beneficial effects of the present invention are:
(1) the present invention provides a kind of single fiber optical tweezers based on wavelength-division multiplex technique, provide to capture multiple particles
A kind of new means；
(2) present invention can adjust the axial direction of captured multiple particles by changing the outgoing light wavelength of optical fiber source
Position；
(3) device used in the present invention is cheap, and preparation method very simple is suitable for pushing away in field of biomedicine
Extensively.
Detailed description of the invention
Fig. 1 is a kind of single fiber optical tweezers structural schematic diagram based on wavelength-division multiplex technique；
Fig. 2 (a) is that a kind of special optical fiber has used annular core fibre, and the frustum of a cone grinds that higher order mode light beam can be made to reflect
It is emitted and converges at the single fiber optical tweezers structural schematic diagram based on wavelength-division multiplex technique before optical fiber probe；
Fig. 2 (b) is that a kind of special optical fiber has used twin-core fiber, and the frustum of a cone grinds that higher order mode light beam can be made to be totally reflected
It is emitted and converges at the single fiber optical tweezers structural schematic diagram based on wavelength-division multiplex technique before optical fiber probe；
Fig. 3 is annular core fibre, twin-core fiber and capillary fiber section and refractive index schematic diagram；
Fig. 4 is the schematic diagram that different wave length generates different catch positions；
The higher order mode beam pattern for capillary fiber outgoing that Fig. 5 (a) is special optical fiber when being twin-core fiber；
The higher order mode beam pattern for capillary fiber outgoing that Fig. 5 (b) is special optical fiber when being annular core fibre.
Specific embodiment
Specific embodiments of the present invention will be further explained with reference to the accompanying drawing:
The present invention is to provide a kind of single fiber multiple light forceps based on wavelength-division multiplex technique, including tunable optical fibre source 1,
Special optical fiber 2, capillary fiber 3.The tail optical fiber of tunable optical source 1 is connect with special optical fiber 2,2 other end of special optical fiber and capillary
Pipe optical fiber 3 welds, and truncated cone probe 3' is made using end face micro-processing technology in the other end of capillary fiber 3.Tunable optical
1 emergent light of source is propagated by special optical fiber 2, and higher order mode light beam 33 is generated in capillary fiber 3, and higher order mode light beam 33 exists
Before refraction occurs at the truncated cone probe 3' of capillary fiber 3 or is totally reflected and converges at optical fiber probe, multiple three-dimensionals are formed
The 3 D captured of multiple particles may be implemented in optical trap.When change 1 emergent light of tunable optical source wavelength, different wave length
Propagation constant of the light in capillary fiber 3 is different, and the process for forming higher order mode light beam 33 is different, so the high-order mode formed
The light spot shape of formula light beam 33 with it is of different sizes, different wave length formed higher order mode light beam 33 converge at before optical fiber probe not
Same position, so as to be used to realize the purpose of the accurate position for manipulating trapped particle.It may be implemented using the present invention based on wave
Different positions before dividing the axial trapping position adjusting of multiplexing technology, change light source output wavelength that emergent light is made to converge in optical fiber probe
It sets to form ligh trap and trapped particle, structure is simple, and it is easy to operate, it is provided for the fields such as biomedicine manipulation fine particle new
Tool.
Embodiment 1
Step 1, the excitation of higher order mode light beam 33: in conjunction with Fig. 1, in order to which (Fig. 2 is capillary in capillary fiber 3
The cross section of optical fiber and refractive index profile) in inspire higher order mode light beam 33, first by the tail optical fiber of optical fiber source and toroidal cores
Optical fiber 2 (cross section and refractive index profile that Fig. 2 (a) is annular core fibre) connection in annular core fibre 2 so that generate steady
Surely the annular beam 22 being distributed, then the other end of annular core fibre 2 is welded with capillary fiber 3 using optical fiber bonding machine, make
The annular beam 22 that annular core fibre 2 is emitted is obtained to develop in capillary fiber 3 as higher order mode light beam 33.The high-order mode of generation
Formula light beam such as Fig. 4.
Step 2, catch position adjusts: in conjunction with Fig. 3, needing after higher order mode light beam 33 is inspired in capillary fiber 3
Its converged position before optical fiber probe is adjusted to change the position of its trapped particle.Therefore exportable different wave length is used
Narrowband emergent light tunable optical source 1.When the wavelength of input light is different, annular beam 22 is passed through in capillary fiber 3
Light path it is different so that the shape and size of the higher order mode light beam 33 formed change, finally realize the high-order of different wave length
Mode light beam converges at the different location before optical fiber probe, that is, realizes from 31 states to the transformation of 31 ' states and control.
Step 3, prepared by fiber taper platform shape probe 3 ': the method for optical fiber grinding core, by the angle for controlling optical fiber and mill
It determines the final inclination alpha of fiber tip, is needed through superrefraction and before converging at optical fiber probe due to just relating to light beam, so α range
For pi/2-arcsin (nliquid-ncore) < α < pi/2.
Step 4, the adjustable experiment of catch position: after whole system connection is finished, light source 1 is opened, in capillary fiber 3
Middle excitation higher order mode light beam 33, the higher order mode light beam 33 through truncated cone fiber tip 3 ' convergence after form optical trap,
Realize the optical acquisition of multiple fine particles 4.Change higher order mode light beam by changing 1 outgoing light wavelength of tunable optical source
Converged position, and then change multiple particles and stablize catch position, reach the adjustable purpose of catch position.
Embodiment 2
Step 1, the excitation of higher order mode light beam 33 ': in conjunction with Fig. 1, in order to inspire height in capillary fiber 3
Rank mode light beam 33, first by the tail optical fiber of optical fiber source and twin-core fiber 2 ', (Fig. 2 (b) is cross section and the refractive index of twin-core fiber
Distribution map) connection, then the other end of twin-core fiber 2 ' is welded with capillary fiber 3 using optical fiber bonding machine, so that twin-core light
The light beam 22 ' of 2 ' outgoing of fibre develops in capillary fiber 3 as higher order mode light beam 33', the higher order mode light beam such as figure of generation
4。
Step 2, catch position adjusts: in conjunction with Fig. 3, needing after higher order mode light beam 33 ' is inspired in capillary fiber 3
Its converged position before optical fiber probe is adjusted to change the position of its trapped particle.Therefore exportable different wave length is used
Narrowband emergent light tunable optical source 1.When the light path that light beam 33 ' is passed through in the wavelength difference of input light, capillary fiber 3
Difference finally realizes the higher order mode light of different wave length so that the shape and size of the higher order mode light beam 33 ' formed change
Beam converges at the different location before optical fiber probe, that is, realizes from 31 states to the transformation of 31 ' states and control.
Step 3, prepared by fiber taper platform shape probe 3 ': the method for optical fiber grinding core, by the angle for controlling optical fiber and mill
It determines the final inclination alpha of fiber tip, is needed through superrefraction and before converging at optical fiber probe due to just relating to light beam, so α range
For 0 < α < pi/2-arcsin (nliquid-ncore).
Step 4, the adjustable experiment of catch position: after whole system connection is finished, light source 1 is opened, in capillary fiber 3
Middle excitation higher order mode light beam 33 ', the higher order mode light beam 33 ' through truncated cone fiber tip 3 ' convergence after form optical potential
Trap realizes the optical acquisition of multiple fine particles 4.Change higher order mode light by changing 1 outgoing light wavelength of tunable optical source
The converged position of beam, and then change multiple particles and stablize catch position, reach the adjustable purpose of catch position.
A kind of single fiber optical tweezers based on wavelength-division multiplex technique, including tunable optical fibre source 1, special optical fiber 2, capillary
Optical fiber 3.The tail optical fiber of tunable optical source 1 is connect with special optical fiber 2, and 2 other end of special optical fiber and capillary fiber 3 weld, capillary
Truncated cone probe 3 ' is made using end face micro-processing technology in the other end of pipe optical fiber 3.1 emergent light of tunable optical source is by extraordinary
Optical fiber 2 is propagated, and higher order mode light beam 33, circular cone of the higher order mode light beam 33 in capillary fiber 3 are generated in capillary fiber 3
Before the place of platform shape probe 3 ' occurs refraction or is totally reflected and converges at optical fiber probe, multiple three-dimensional optical potential wells are formed, may be implemented
Multiple particles it is 3 D captured.When the wavelength for changing tunable optical source 1 (continuously adjusting frequency conversion light source outgoing wavelength) emergent light, no
Propagation constant of the light of co-wavelength in capillary fiber 3 is different, and the process for forming higher order mode light beam 33 is different, so being formed
Higher order mode light beam 33 light spot shape with it is of different sizes, different wave length formed higher order mode light beam 33 converge at optical fiber spy
Different location before needle is realized captured multiple so as to be used to realize the purpose of the accurate position for manipulating trapped particle
The fine tuning of particles position.
Claims (3)
1. a kind of single fiber optical tweezers based on wavelength-division multiplex technique, it is characterised in that: extraordinary including tunable optical fibre source (1)
Optical fiber (2), capillary fiber (3)；The tail optical fiber of tunable optical fibre source (1) is connect with special optical fiber (2), and special optical fiber (2) is another
One end and capillary fiber (3) are welded, and the other end of capillary fiber (3) is made truncated cone using end face micro-processing technology and visits
Needle (3 ').
2. a kind of single fiber optical tweezers based on wavelength-division multiplex technique according to claim 1, it is characterised in that: the spy
Kind optical fiber (2) is multi-core optical fiber or annular core fibre；Each fibre core of the multi-core optical fiber is with optical fiber main shaft apart from identical, fibre core number
≥2；The fibre core and optical fiber main shaft spacing r of the annular core fibre1Greater than capillary fiber internal diameter r2。
3. a kind of single fiber optical tweezers based on wavelength-division multiplex technique according to claim 1, it is characterised in that: the circle
Tapered probe (3 ') is prepared using fiber end face micro-processing technology, and the cone angle range of work is between 10 °~80 °.
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Cited By (3)
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|---|---|---|---|---|
| CN110137792A (en) * | 2019-05-14 | 2019-08-16 | 桂林电子科技大学 | Multi-core optical fiber cell laser with stretch function |
| CN111123435A (en) * | 2019-11-04 | 2020-05-08 | 桂林电子科技大学 | Self-assembly type super-resolution optical probe based on optical fiber tweezers |
| CN112068249A (en) * | 2020-09-06 | 2020-12-11 | 桂林电子科技大学 | Fiber optical tweezers and system based on special optical fiber |
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