CN109270695B - Traction light beam generating device and method - Google Patents
Traction light beam generating device and method Download PDFInfo
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- CN109270695B CN109270695B CN201811447760.1A CN201811447760A CN109270695B CN 109270695 B CN109270695 B CN 109270695B CN 201811447760 A CN201811447760 A CN 201811447760A CN 109270695 B CN109270695 B CN 109270695B
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- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0927—Systems for changing the beam intensity distribution, e.g. Gaussian to top-hat
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- G—PHYSICS
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- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
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Abstract
The invention provides a traction light beam generating device and a generating method, comprising a single-core optical fiber, a ring-core optical fiber and a ring-core Bessel optical fiber; the single-core optical fiber, the annular core optical fiber and the annular core Bessel optical fiber are sequentially connected, a connecting point of the single-core optical fiber and the annular core optical fiber is a coupling cone region, the annular core Bessel optical fiber is composed of a cladding and a plurality of concentric annular waveguide cores, the fiber core of the annular core optical fiber is connected with the innermost annular waveguide core of the annular core Bessel optical fiber, and the end face of the annular core Bessel optical fiber is of a cone frustum structure. Compared with the traditional method for constructing the light beam by space optics, the invention provides a feasible scheme for drawing the light beam in the micro environment, the method has the advantages of flexibility, miniaturization and light beam drawing of the optical fiber, and has good application prospect in the fields of biology, chemistry and micromachining.
Description
Technical Field
The invention relates to a light beam generating device and a light beam generating method, in particular to a novel traction light beam generating device and a novel traction light beam generating method, and belongs to the field of special light beam research.
Background
The light beam capable of realizing the optical traction effect is called an optical traction light beam, the traction light beam is an anti-physical-intuitional optical phenomenon, the basic understanding that researchers generally consider that a diffraction-free light beam necessarily applies thrust to an object is changed, the abnormal phenomenon of the optical traction force necessarily implies a certain special new law of interaction of light and substances, so that the optical traction light beam has important significance in basic research of the nature of the light and the interaction of the light and the substances, meanwhile, the traction light beam can realize long-distance control and transportation of the object, and an optical separation technology based on the traction light beam is considered as the most promising optical means in the aspect of biomedicine.
In the work of Chen et al, where a small ball is illuminated with a non-diffractive Bessel beam, incident light excites the multipole moment of the particle, increasing the scattered light in the direction of beam propagation by multipole interference, the particle will get a negative momentum when the momentum of the scattered light is greater than the momentum of the incident light, thus moving against the direction of beam propagation. Brzobhay et al (Nature Photonics,2013,7(2):123-127) in 2013 adopt a two-beam interference method to realize optical traction, and the two-beam interference is utilized to enhance the forward scattering of particles, so that an object obtains an optical tension and the effect of separating different particles is realized.
At present, the research of the traction light beam is mostly based on a spatial light path, expensive and large-scale spatial optical equipment such as a spatial light modulator and the like is needed to be adopted, the construction and the change of a light field are realized through various spatial optical elements, the problems of complex light path, huge optical system and the like exist, and the probe type application is difficult to realize.
Disclosure of Invention
The invention aims to provide a traction light beam generating device and a generating method which have diffraction-free and gradient-free characteristics in the light propagation direction.
The purpose of the invention is realized as follows:
a traction light beam generating device comprises a single-core optical fiber, a ring-core optical fiber and a ring-core Bessel optical fiber; the single-core optical fiber, the annular core optical fiber and the annular core Bessel optical fiber are sequentially connected, a connecting point of the single-core optical fiber and the annular core optical fiber is a coupling cone region, the annular core Bessel optical fiber is composed of a cladding and a plurality of concentric annular waveguide cores, the fiber core of the annular core optical fiber is connected with the innermost annular waveguide core of the annular core Bessel optical fiber, and the end face of the annular core Bessel optical fiber is of a cone frustum structure.
The invention also includes such features:
1. the spatial arrangement of the annular waveguide cores meets a Bessel-Gaussian function;
2. the thickness and the refractive index of the fiber core of the annular core optical fiber are consistent with those of the innermost annular waveguide core of the annular core Bessel optical fiber;
3. the fiber cores of the annular core optical fibers are symmetrical about the main axis of the optical fiber and are positioned in the same inner cladding layer and the same outer cladding layer;
4. the single-core optical fiber is a single-mode optical fiber or a multi-mode optical fiber, and the fiber core of the optical fiber is positioned at the axis of the optical fiber.
A method of towing beam generation:
the light injected into the single-core optical fiber by the light source forms an annular light beam in the annular-core optical fiber through the coupling cone region,
the annular light beam is injected into the annular core Bessel optical fiber and is transmitted for a certain distance to stably form a similar high-order Bessel light beam,
and after passing through the conical frustum end face of the annular core Bessel fiber, the similar high-order Bessel optical field is subjected to combined reconstruction to generate a traction light beam.
Compared with the prior art, the invention has the beneficial effects that:
1. compared with the traditional method for constructing the light beam by space optics, the invention provides a feasible scheme for drawing the light beam in the micro environment, and the method has the advantages of flexibility, miniaturization and light beam drawing of the optical fiber and has good application prospect in the fields of biology, chemistry and micromachining.
2. The novel traction light beam not only has a symmetrical space structure, but also has the characteristic of no diffraction of the Bessel light beam, can realize long-distance optical traction operation on tiny particles in the light beam, and enriches the structural form of the traction light beam.
3. The adopted devices have low price and the preparation method is simple.
The invention utilizes the optical fiber technology to generate the similar high-order Bessel light beam in the optical fiber, then the optical field is combined and reconstructed through a specially designed optical fiber end surface to obtain the novel traction light beam, the combined novel traction light beam has the characteristics of no diffraction and no gradient in the light beam propagation direction, and the optical traction can be realized on the tiny particles in the light beam under the condition of no gradient force action.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a simulation diagram of the optical wave coupling process in the ring-core Bessel fiber;
FIG. 3 is a schematic diagram of an excitation annular beam configuration within an annular core;
FIG. 4a is a schematic diagram of an annular core Bessel fiber polished end face;
fig. 4b is a top view of fig. 4 a.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
A traction light beam generating device and a generating method thereof comprise a light source 1, a single-core optical fiber 2, an annular-core optical fiber 3, a coupling cone area 4 formed by welding one end of the single-core optical fiber 2 and one end of the annular-core optical fiber 3 and melting and tapering at a welding point, and an annular-core Bessel optical fiber 5, wherein the end surface of the annular-core Bessel optical fiber 5 is processed to form a cone frustum structure 6, and the traction light beam generating device is characterized in that light injected into the single-core optical fiber 2 by the light source 1 forms an annular light beam in the annular-core optical fiber 3 through the coupling cone area 4, the annular light beam is injected into the annular-core Bessel optical fiber 5 and is transmitted for a certain distance to stably form a similar high-order Bessel light beam, the similar high-order Bessel light beam is combined and reconstructed after passing through the cone frustum end surface 6 of the annular-core Bessel optical; the annular core position of the annular core optical fiber 3 is symmetrical about the optical fiber main shaft and is positioned in the same inner and outer claddings; the annular core Bessel fiber 5 is composed of a cladding and a plurality of concentric annular waveguide layers, the spatial arrangement of the concentric annular waveguide layers approximately meets a Bessel-Gaussian function, and after the annular light beam is input into the annular core Bessel fiber 5 and is coupled and transmitted for a certain distance, a similar high-order Bessel light beam is generated in the annular core Bessel fiber 5; the thickness and the refractive index of the fiber core of the annular core optical fiber 3 are consistent with those of the innermost annular waveguide core of the annular core Bessel optical fiber 5, and the two fiber cores are just welded, so that the annular light beam is injected into the annular core Bessel optical fiber 5.
After light emitted by the light source passes through the coupling cone region 4, an annular light beam is generated in the annular core optical fiber, the annular light beam is coupled and transmitted in the annular core Bessel optical fiber, and the satisfied coupling equation is as follows:
wherein κpqIs the coupling coefficient of ring core p to ring core q, which can be expressed as:
εqε represents the difference in dielectric constant of the core q and the surrounding cladding, while the electric field in the toroidal core p can be expressed as:
in this way, the cross-sectional optical field in the ring-core bessel fiber is obtained:
after an annular light field is input into the annular core Bessel optical fiber, light waves are transmitted along the annular core and are continuously coupled and transmitted to each layer of waveguide layers outside the annular core, and the light waves are modulated by a distance, so that a similar high-order Bessel light beam is generated in the optical fiber.
The first embodiment is as follows:
1. a980 nm laser light source is selected, 1.5m single-mode optical fiber is cut, one end face of the single-mode optical fiber is stripped, cleaned and cut through a coating layer, the single-mode optical fiber is inserted into a bare fiber adapter, and the bare fiber adapter is connected to an output interface of the laser light source.
2. And cutting a section of annular core optical fiber, stripping a coating layer at one end of the annular core optical fiber and the other end of the single mode optical fiber, cleaning, cutting, putting into an optical fiber welding machine, and welding. And loading the welded optical fiber on a fixture of an oxyhydrogen flame optical fiber tapering machine, so that a welding spot is positioned under the oxyhydrogen flame head. The other end of the annular core fiber is stripped, cleaned and cut through the coating layer, then the other end of the annular core fiber is connected with a CCD of a computer to monitor the emergent light field of the annular fiber core of the annular core fiber, when the annular fiber is emergent, the tapering is stopped, and the annular fiber is packaged by a glass sleeve to protect the tapered area, as shown in figure 3.
3. Taking a section of annular core Bessel optical fiber, stripping, cleaning and cutting the other end of the annular core optical fiber and one end of the annular core Bessel optical fiber through a coating layer, and then putting the annular core optical fiber and the annular waveguide core at the innermost side of the annular core Bessel optical fiber into an optical fiber welding machine, wherein during welding, the fiber core of the annular core optical fiber and the annular waveguide core at the innermost side of the annular core Bessel optical fiber are just welded together.
4. As shown in fig. 4, the other end of the ring-core bessel fiber is processed into a truncated cone shape by using a fiber grinding technology, wherein the grinding angle is 45 degrees, and the grinding depth must ensure that the focusing of a high-order bessel-like beam can be realized.
5. Light with the wavelength of 980nm is injected into the single-mode optical fiber, and a novel traction light beam with diffraction-free and gradient-free characteristics in the light beam propagation direction can be emitted and generated at the cone-grinding end of the ring-core Bessel optical fiber.
Example two:
1. after a novel traction beam was constructed by the procedure of example one, the prepared polystyrene sphere solution was dropped onto a glass slide using a rubber-tipped dropper, and the glass slide was placed on the stage of a microscope.
2. The end face of the ring-shaped core Bessel optical fiber processed by the cone grinding is extended into the polystyrene sphere solution by utilizing the three-dimensional operation platform, so that the end face of the optical fiber is completely immersed and is not in direct contact with the glass slide, and the placing direction of the optical fiber is parallel to the plane of the glass slide.
3. The microscope was focused until the fiber end face and the polystyrene spheres in the polystyrene sphere solution were clearly and completely visible in the eyepiece of the microscope.
4. And turning on a light source with the wavelength of 980nm, adjusting the power of the light source to about 30mW, and adjusting the movable optical fiber end face of the three-dimensional operating platform to realize the traction effect on the polystyrene spheres within the range of the traction light beams.
In summary, the following steps: the invention provides a novel traction light beam and a construction method thereof. The method is characterized in that a single-core optical fiber, an annular-core optical fiber and an annular-core Bessel optical fiber are sequentially welded together, a taper is melted at the welding position of the single-core optical fiber and the annular-core optical fiber, light injected into the single-core optical fiber generates an annular light beam in the annular-core optical fiber through a coupling taper region, the annular light beam is injected into the annular-core Bessel optical fiber, and after transmission for a certain distance, a similar high-order Bessel light beam is generated in the annular-core Bessel optical fiber, and after passing through the end face of a circular truncated cone of the annular-core Bessel optical fiber, a light field is combined and reconstructed to obtain a novel traction light beam which has no diffraction and no gradient characteristics in the light propagation direction, so that optical traction can be realized on tiny particles in the light beam, and the novel traction.
Claims (6)
1. A traction light beam generating device is characterized by comprising a single-core optical fiber, a ring-core optical fiber and a ring-core Bessel optical fiber; the single-core optical fiber, the annular core optical fiber and the annular core Bessel optical fiber are sequentially connected, the connecting point of the single-core optical fiber and the annular core optical fiber is a coupling cone area, the annular core Bessel optical fiber is composed of a cladding and a plurality of concentric annular waveguide cores, the fiber core of the annular core optical fiber is connected with the innermost annular waveguide core of the annular core Bessel optical fiber, the end face of the annular core Bessel optical fiber is of a cone frustum structure, and the spatial arrangement of the concentric annular waveguide cores meets the Bessel-Gaussian function.
2. The traction beam generator as claimed in claim 1, wherein the core thickness and refractive index of the ring-core optical fiber are the same as those of the innermost ring waveguide core of the ring-core bessel fiber.
3. The traction beam generator of claim 1 or 2 wherein the cores of said ring-core optical fiber are symmetric about the principal axis of the fiber and are in the same inner and outer cladding.
4. The device as claimed in claim 1 or 2, wherein the single core fiber is a single mode fiber or a multimode fiber, and the core of the single fiber is located at the axis of the single fiber.
5. The traction beam generator as claimed in claim 3 wherein said single core fiber is a single mode fiber or a multimode fiber, the core of the fiber being located at the center of the fiber.
6. A method for generating a traction light beam is characterized in that,
the light injected into the single-core optical fiber by the light source forms an annular light beam in the annular-core optical fiber through the coupling cone region,
the annular light beam is injected into the annular core Bessel optical fiber and is transmitted for a certain distance to stably form a similar high-order Bessel light beam,
after passing through the circular truncated cone end face of the annular core Bessel optical fiber, performing combined reconstruction on the similar high-order Bessel optical field to generate a traction light beam; the ring-shaped core Bessel fiber is composed of a cladding and a plurality of concentric ring-shaped waveguide cores, and the spatial arrangement of the concentric ring-shaped waveguide cores meets a Bessel-Gaussian function.
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| CN109683330B (en) * | 2019-01-30 | 2021-04-30 | 复旦大学 | Method for generating Bessel-like light beam by growing micro-cone on end face of optical fiber |
| CN112363320B (en) * | 2020-09-27 | 2022-02-01 | 四川长虹电器股份有限公司 | Optical fiber vortex optical beam generator and preparation method thereof |
| CN113687469A (en) * | 2021-08-26 | 2021-11-23 | 桂林电子科技大学 | Multifunctional optical fiber micro-impact gun tool |
| CN114137654A (en) * | 2021-11-12 | 2022-03-04 | 中国工程物理研究院激光聚变研究中心 | Grating preparation method and grating preparation monitoring system for annular waveguide fiber |
| CN114047635A (en) * | 2021-11-22 | 2022-02-15 | 燕山大学 | Groove-assisted optical fiber capable of generating Bessel beams of different forms |
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| WO2010045366A1 (en) * | 2008-10-17 | 2010-04-22 | The Arizona Board Of Regents On Behalf Of The University Of Arizona | Apparatus and method of generating nearly non-diffracting beams from multimode optical fibers |
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| CN104181637A (en) * | 2013-05-24 | 2014-12-03 | 无锡万润光子技术有限公司 | All-fiber Bessel light beam generator |
| CN104914492B (en) * | 2015-05-13 | 2018-06-19 | 中国科学院上海光学精密机械研究所 | The design method of adjustable bessel beam generation device and its high-order annulus Darman raster |
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