CN109254346B - Single-fiber optical tweezers based on wavelength division multiplexing technology - Google Patents

Single-fiber optical tweezers based on wavelength division multiplexing technology Download PDF

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CN109254346B
CN109254346B CN201810808621.0A CN201810808621A CN109254346B CN 109254346 B CN109254346 B CN 109254346B CN 201810808621 A CN201810808621 A CN 201810808621A CN 109254346 B CN109254346 B CN 109254346B
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optical fiber
fiber
capillary
order mode
light source
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CN109254346A (en
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张亚勋
王通
汤晓云
刘志海
张羽
杨军
苑立波
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Harbin Engineering University
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Harbin Engineering University
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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
    • 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
    • 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
    • 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
    • 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

Abstract

A single optical fiber optical tweezers based on wavelength division multiplexing technology belongs to the technical field of optical fiber optical tweezers. Comprises a tunable optical fiber light source (1), a special optical fiber (2) and a capillary optical fiber (3); the tail fiber of the tunable optical fiber light source (1) is connected with the special optical fiber (2), the other end of the special optical fiber (2) is welded with the capillary optical fiber (3), and the other end of the capillary optical fiber (3) is manufactured into a cone frustum-shaped probe (3') by using an end surface micromachining technology. The wavelength of light emitted by the tunable light source (1) is changed to form high-order mode light beams (33) which are focused at different positions in front of the optical fiber probe, so that the position of the captured particles is accurately controlled. The invention can realize the axial capture position adjustment based on the wavelength division multiplexing technology, changes the output wavelength of the light source to ensure that the emergent light is converged at different positions in front of the optical fiber probe to form an optical trap and capture particles, has simple structure and convenient operation, and provides a new tool for controlling the tiny particles in the fields of biomedicine and the like.

Description

Single-fiber optical tweezers based on wavelength division multiplexing technology
Technical Field
The invention belongs to the technical field of optical tweezers, and particularly relates to single optical tweezers based on a wavelength division multiplexing technology.
Background
Since Ashkin et al, 1986, Optical Letters,18(5): 288-. The optical tweezers can generate capture force and carry out micro-operation on biological cells and the like, and have wide application in the fields of biology, physics, chemistry and the like. Optical tweezers can be divided into two categories: one is the traditional optical tweezers based on microscope objective lens of the high numerical aperture, the traditional optical tweezers pass the laser beam through the optical lens of the high numerical aperture to focus, make it form a highly focused facula and thus produce the optical trapping force, the experimental apparatus of the traditional optical tweezers is often the system is bulky and heavy and the working distance is small, the price is expensive, make it have very big restriction in the actual application; the other type is novel optical fiber tweezers based on optical fibers, the preparation process of the optical fiber tweezers is simple, the manufacturing cost is low, the operation is convenient, the working distance is long, the working optical path and the observation optical path of the optical tweezers are mutually independent, and the operation on the captured particles is not influenced when the captured particles are observed at any angle.
In recent years, optical fiber tweezers have been widely noticed and studied, and originally, single fiber optical tweezers can only control and move single particles. Researchers have proposed a single-fiber multi-tweezers based on single-mode fiber [ Chinese Physi-cs B,23(8):088702,2014], which can capture multiple particles. However, the diameter of the single-mode fiber core is small, so that the process is complex and the repeatability is low when the lens used for converging emergent light at the tip of the optical fiber is manufactured, and in addition, the optical tweezers can only realize contact type capture of a plurality of particles and can not realize position adjustment, rotation and other operations of the captured particles. In 2013, researchers have proposed a single fiber optical tweezers [ Optics letters,2013,38(14): 2617-. In addition, researchers have filled cholesteric liquid crystals into hollow-core optical fibers having a plurality of core holes and fine-tuned the particle position by varying the intensity of the input light [ chinese patent CN106094098A ]. These optical tweezers devices are complex in structure and inconvenient for practical operation and application.
Disclosure of Invention
The invention aims to provide single-fiber optical tweezers based on a wavelength division multiplexing technology. The single-fiber optical tweezers based on wavelength division multiplexing can stably capture a plurality of particles, the positions of the particles can be axially adjusted, and the size and the shape of the light spot of the output high-order mode light beam are changed by changing the wavelength of input light, so that the output light beam is converged at different positions in front of the optical fiber probe through the cone frustum-shaped cone tip, and the capture of the particles and the adjustment of the axial capturing positions of the optical fibers of the particles are realized.
The purpose of the invention is realized as follows:
a single optical fiber optical tweezers based on wavelength division multiplexing technology comprises a tunable optical fiber light source 1, a special optical fiber 2 and a capillary optical fiber 3; the tail fiber of the tunable optical fiber light source 1 is connected with the special optical fiber 2, the other end of the special optical fiber 2 is welded with the capillary optical fiber 3, and the other end of the capillary optical fiber 3 is manufactured into a cone frustum-shaped probe 3' by using an end surface micromachining technology.
The present invention may further comprise:
1. the special optical fiber 2 can be a multi-core optical fiber (the distance between each fiber core and the optical fiber main shaft is the same, the number of the fiber cores is more than or equal to 2) or a ring-core optical fiber, and the distance r1 between the fiber cores and the optical fiber main shaft is larger than the inner diameter r2 of the capillary optical fiber.
2. The preparation of the conical probe 3' is realized by adopting the fiber end surface micro-processing technology, and the processing range of the cone angle alpha is between 10 and 80 degrees.
The invention has the beneficial effects that:
(1) the invention provides a single optical fiber optical tweezers based on wavelength division multiplexing technology, which provides a new means for capturing a plurality of particles;
(2) the invention can adjust the axial position of a plurality of captured particles by changing the wavelength of emergent light of the optical fiber light source;
(3) the device used by the invention has low price, the preparation method is very simple, and the invention is suitable for popularization in the field of biomedicine.
Drawings
FIG. 1 is a schematic diagram of a single fiber optical tweezers structure based on wavelength division multiplexing technology;
FIG. 2(a) is a schematic diagram of a single optical fiber tweezers structure based on wavelength division multiplexing technology, in which a special optical fiber uses a ring core fiber, and a truncated cone is ground to refract and emit a high-order mode beam and converge the high-order mode beam on a fiber probe;
FIG. 2(b) is a schematic diagram of a special optical fiber using a dual-core optical fiber, in which a truncated cone is ground to make a high-order mode beam emergent by total reflection and converging on a single optical fiber optical tweezers structure based on a wavelength division multiplexing technique before an optical fiber probe;
FIG. 3 is a schematic diagram of the cross section and refractive index of a ring-core optical fiber, a dual-core optical fiber and a capillary optical fiber;
FIG. 4 is a schematic diagram of different capture locations generated at different wavelengths;
FIG. 5(a) is a high-order mode beam diagram emitted from a capillary fiber when the special fiber is a dual-core fiber;
fig. 5(b) is a high-order mode beam diagram emitted from the capillary fiber when the special fiber is a ring core fiber.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
the invention provides single-fiber multi-optical tweezers based on a wavelength division multiplexing technology, which comprise a tunable fiber light source 1, a special fiber 2 and a capillary fiber 3. The tail fiber of the tunable light source 1 is connected with the special optical fiber 2, the other end of the special optical fiber 2 is welded with the capillary optical fiber 3, and the other end of the capillary optical fiber 3 is manufactured into a cone frustum-shaped probe 3' by using an end surface micromachining technology. Emergent light of the tunable light source 1 is transmitted through the special optical fiber 2, high-order mode light beams 33 are generated in the capillary optical fiber 3, the high-order mode light beams 33 are refracted or totally reflected at the position of the cone frustum-shaped probe 3' of the capillary optical fiber 3 and converged in front of the optical fiber probe to form a plurality of three-dimensional optical potential wells, and three-dimensional capture of a plurality of particles can be achieved. When the wavelength of light emitted by the tunable light source 1 is changed, the propagation constants of light with different wavelengths in the capillary optical fiber 3 are different, and the processes of forming the high-order mode light beam 33 are different, so that the shapes and sizes of light spots of the formed high-order mode light beam 33 are different, and the high-order mode light beam 33 formed with different wavelengths can be converged at different positions in front of the optical fiber probe, so that the purpose of accurately controlling the position of the captured particle can be realized. The invention can realize the axial capture position adjustment based on the wavelength division multiplexing technology, changes the output wavelength of the light source to ensure that the emergent light is converged at different positions in front of the optical fiber probe to form an optical trap and capture particles, has simple structure and convenient operation, and provides a new tool for controlling the tiny particles in the fields of biomedicine and the like.
Example 1
Step 1, excitation of the high-order mode beam 33: referring to fig. 1, in order to excite a high-order mode beam 33 in a capillary fiber 3 (fig. 2 shows a cross section and a refractive index profile of the capillary fiber), a pigtail of a fiber light source is connected to a ring-core fiber 2 (fig. 2(a) shows a cross section and a refractive index profile of the ring-core fiber) to generate a stably distributed ring beam 22 in the ring-core fiber 2, and the other end of the ring-core fiber 2 is bonded to the capillary fiber 3 by using a fiber bonding machine, so that the ring beam 22 emitted from the ring-core fiber 2 is transformed into the high-order mode beam 33 in the capillary fiber 3. The resulting higher order mode beam is shown in fig. 4.
Step 2, adjusting the capture position: referring to fig. 3, after a high-order mode beam 33 is excited in the capillary fiber 3, it needs to be adjusted to its converging position in front of the fiber probe to change the position of the particle captured by it. A tunable light source 1 is used which can output narrowband outgoing light of different wavelengths. When the wavelengths of the input light are different, the optical paths of the ring-shaped light beam 22 passing through the capillary fiber 3 are different, so that the shape and the size of the formed high-order mode light beam 33 are changed, and finally, the high-order mode light beams with different wavelengths are converged at different positions in front of the fiber probe, namely, the transition and the control from the 31 state to the 31' state are realized.
Step 3, preparing an optical fiber conical probe 3': the method for tapering the optical fiber determines the final inclination angle alpha of the optical fiber tip by controlling the angle between the optical fiber and the abrasive disc, and the alpha range is pi/2-arcsin (nliquid-ncore) < alpha < pi/2 because the initial-interference light beam needs to be refracted and converged in front of the optical fiber probe.
And 4, capturing an experiment with adjustable position: after the whole system is connected, the light source 1 is turned on, the high-order mode light beam 33 is excited in the capillary optical fiber 3, and the high-order mode light beam 33 is converged by the cone frustum-shaped optical fiber tip 3' to form an optical potential well, so that optical capture of a plurality of micro particles 4 is realized. The convergence position of the high-order mode light beam is changed by changing the wavelength of the light emitted by the tunable light source 1, so that the stable capture positions of a plurality of particles are changed, and the purpose of adjusting the capture positions is achieved.
Example 2
Step 1, excitation of high-order mode beam 33': referring to fig. 1, in order to excite the high-order mode light beam 33 in the capillary fiber 3, the pigtail of the fiber light source is connected to the dual-core fiber 2 ' (fig. 2(b) is a cross-section and refractive index profile of the dual-core fiber), and the other end of the dual-core fiber 2 ' is welded to the capillary fiber 3 by using a fiber welding machine, so that the light beam 22 ' emitted from the dual-core fiber 2 ' is transformed into the high-order mode light beam 33' in the capillary fiber 3, and the generated high-order mode light beam is as shown in fig. 4.
Step 2, adjusting the capture position: referring to fig. 3, after a high-order mode beam 33' is excited in the capillary fiber 3, it needs to be adjusted to its converging position in front of the fiber probe to change the position of the particle captured by it. A tunable light source 1 is used which can output narrowband outgoing light of different wavelengths. When the wavelengths of the input light are different, the optical paths through which the light beams 33' pass in the capillary fiber 3 are different, so that the shape and the size of the formed high-order mode light beams 33' are changed, and finally, the high-order mode light beams with different wavelengths are converged at different positions in front of the fiber probe, namely, the transition and the control from the 31 state to the 31 ' state are realized.
Step 3, preparing an optical fiber conical probe 3': the method of the optical fiber taper determines the final inclination angle alpha of the optical fiber tip by controlling the angle between the optical fiber and the grinding disc, and the alpha range is 0< alpha < pi/2-arcsin (nliquid-ncore) because the initial-interference light beam needs to be refracted and converged in front of the optical fiber probe.
And 4, capturing an experiment with adjustable position: after the whole system is connected, the light source 1 is turned on, high-order mode light beams 33' are excited in the capillary optical fiber 3, and the high-order mode light beams 33' are converged by the cone frustum-shaped optical fiber tip 3' to form an optical potential well, so that optical capture of a plurality of micro particles 4 is realized. The convergence position of the high-order mode light beam is changed by changing the wavelength of the light emitted by the tunable light source 1, so that the stable capture positions of a plurality of particles are changed, and the purpose of adjusting the capture positions is achieved.
A single optical fiber optical tweezers based on wavelength division multiplexing technology comprises a tunable optical fiber light source 1, a special optical fiber 2 and a capillary optical fiber 3. The tail fiber of the tunable light source 1 is connected with the special optical fiber 2, the other end of the special optical fiber 2 is welded with the capillary optical fiber 3, and the other end of the capillary optical fiber 3 is manufactured into a cone frustum-shaped probe 3' by using an end surface micromachining technology. Emergent light of the tunable light source 1 is transmitted through the special optical fiber 2, high-order mode light beams 33 are generated in the capillary optical fiber 3, the high-order mode light beams 33 are refracted or totally reflected at the position of the cone frustum-shaped probe 3' of the capillary optical fiber 3 and converged in front of the optical fiber probe to form a plurality of three-dimensional optical potential wells, and three-dimensional capture of a plurality of particles can be achieved. When the wavelength of emergent light of the tunable light source 1 (the emergent wavelength of the variable-frequency light source is continuously adjusted) is changed, the propagation constants of light with different wavelengths in the capillary optical fiber 3 are different, and the processes of forming the high-order mode light beam 33 are different, so that the shapes and the sizes of light spots of the formed high-order mode light beam 33 are different, and the high-order mode light beam 33 formed by different wavelengths can be converged at different positions in front of the optical fiber probe, so that the purpose of accurately controlling the positions of the captured particles can be realized, and the fine adjustment of the positions of the captured particles can be realized.

Claims (2)

1. A single optical fiber optical tweezers based on wavelength division multiplexing technology is characterized in that: comprises a tunable optical fiber light source (1), a special optical fiber (2) and a capillary optical fiber (3); the tail fiber of the tunable optical fiber light source (1) is connected with the special optical fiber (2), the other end of the special optical fiber (2) is welded with the capillary optical fiber (3), and the other end of the capillary optical fiber (3) is manufactured into a cone frustum-shaped probe (3') by using an end surface micromachining technology; emergent light of the tunable optical fiber light source (1) is transmitted through the special optical fiber (2), high-order mode light beams (33) are generated in the capillary optical fiber (3), the high-order mode light beams (33) are refracted or totally reflected at the position of the cone frustum-shaped probe (3') of the capillary optical fiber (3) and converged in front of the optical fiber probe to form a plurality of three-dimensional optical potential wells, and three-dimensional capture of a plurality of particles can be realized; when the wavelength of light emitted by the tunable optical fiber light source (1) is changed, the propagation constants of the light with different wavelengths in the capillary optical fiber (3) are different, and the processes of forming the high-order mode light beams (33) are different, so that the shapes and the sizes of light spots of the formed high-order mode light beams (33) are different, and the positions of the high-order mode light beams (33) formed by different wavelengths before converging in the optical fiber probe are different, so that the purpose of accurately controlling the positions of the captured particles can be realized, and the fine adjustment of the positions of the captured particles can be realized.
2. The single fiber optical tweezers based on wavelength division multiplexing technology as claimed in claim 1, wherein: the cone frustum-shaped probe (3') is prepared by adopting an optical fiber end surface micromachining technology, and the cone angle alpha processing range meets the requirement that high-order mode light beams transmitted in the capillary optical fiber (3) are refracted or converged by total reflection, so that enough light trap force is provided for capturing particles, and the angle is 10-80 degrees.
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