CN101907742B - Array optical tweezers based on multicore polarization-preserving fiber and manufacturing method thereof - Google Patents
Array optical tweezers based on multicore polarization-preserving fiber and manufacturing method thereof Download PDFInfo
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- CN101907742B CN101907742B CN2010102034860A CN201010203486A CN101907742B CN 101907742 B CN101907742 B CN 101907742B CN 2010102034860 A CN2010102034860 A CN 2010102034860A CN 201010203486 A CN201010203486 A CN 201010203486A CN 101907742 B CN101907742 B CN 101907742B
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Abstract
The invention provides array optical tweezers based on multicore polarization-preserving fiber and a manufacturing method thereof. The array optical tweezers comprise the multicore polarization-preserving fiber, standard single-mode fiber and a laser light source, wherein the laser light source is connected with one end of the standard single-mode fiber, the other end of the standard single-mode fiber is connected with the multicore polarization-preserving fiber in a fusion conical pull coupling mode, and the other end of the multicore polarization-preserving fiber is manufactured into a centrum shape through fusion conical pull processing equipment. In the invention, a plurality of optical waveguide fiber cores are integrated in one fiber, thus not only saving physical space but also significantly reducing system input light power and reducing harm on particles to be captured. Meanwhile, the multicore fiber composite optical tweezers can capture particles more flexibly and accurately, and has adjustability, thus greatly improving the practicability of fiber and optical tweezers technologies. More importantly, the array optical tweezers can form a compact interference grid optical field array, so as to form optical potential wells at coherence enforcement points to realize functions such as filtering particles.
Description
Technical field
The invention belongs to the optical fiber technology research field, what relate to is a kind of array optical tweezers.The invention still further relates to a kind of preparation method of array optical tweezers.
Background technology
The light tweezer is to utilize the gradient force of light intensity distributions and the instrument that fine particle was captured and handled to scattering force.Askin proposed a kind of three-dimensional optical potential well based on single beam laser in " Observation of a single-beam gradient force optical trap for dielectric particles " literary composition in 1986; Be used to realize three dimensions control to particle; Because this light beam can the implementation space to the clamping of fine particle; Hence obtain one's name by " light tweezer ", this piece article is published in Opt.Lett.11,288-290.After this, the optical tweezer technology development becomes important investigative technique means, and has promoted the fast development of some crossing domains rapidly.For example: fine particle catch and the fields such as assembling of carrying, skin ox level force measurement, micromechanics and micro element are widely used.At life science, optical tweezer technology is contactless with it, the intrinsic propesties of lossless detection has shown its impayable advantage especially, has brought into play enormous function for the manipulation that promotes development of life science and little life entity.The particle size that the light tweezer is captured can be rigid particles from several nanometers to tens micron, also can be soft material grains; Can be abiotic particle, also can be active somatic cell or virus.
Since being developed to the optical fiber optical tweezers technology by traditional light tweezer, produced multiple optical fiber optical tweezers system, for example: people such as E.R.Lyons become cone with the end surface grinding of two single-mode fibers; At hemisphere face of the most advanced and sophisticated formation of cone; Make outgoing beam have the weak focusing characteristic, become certain optical axis included angle to place these two optical fiber, the ligh trap that the overlapping light field forms can be realized capture particles and suspension; This piece article is published in Appl.Phys.Lett.66 in nineteen ninety-five, 1584-1586; In order further the attitude of the fine particle of being caught to be controlled; By name " be used for twin-core single fiber optical tweezers of capturing minute particle and preparation method thereof ", publication number are to have provided a kind of twin-core fiber light tweezer again in the Chinese invention patent file of CN101149449.After this, disclose the light tweezer based on ring-shaped multi-core fiber again, publication number is CN101236275; With the multiple light forceps that is integrated in simple optical fiber, publication number is new type light tweezers such as CN101251620.These new type light tweezer multipotencys are realized single particulate is caught, space orientation, made function such as its space rotation, but seldom see the single fiber optical tweezers that can operate a plurality of particles simultaneously.
Summary of the invention
The object of the present invention is to provide a kind ofly when practicing thrift physical space, can significantly reduce system's input optical power, to reduce injury to particle to be captured; To capture particles more flexibly, accurately, possesses controllability; Can form compact interference grid light field array in optical fiber end, form the optics potential well realizes functions such as screening to particle array optical tweezers based on multi-core polarization-preserving fiber at relevant hard point.The present invention also aims to provide a kind of preparation method of array optical tweezers.
The objective of the invention is to realize like this:
Array optical tweezers of the present invention comprises multi-core polarization-preserving fiber, standard single-mode fiber and LASER Light Source; LASER Light Source is connected with an end of standard single-mode fiber; The fusion vertebral pulling is of coupled connections between the other end of standard single-mode fiber and the multi-core polarization-preserving fiber, and the other end of multi-core polarization-preserving fiber becomes the centrum shape through fusion vertebral pulling processing and preparing.
Described multi-core polarization-preserving fiber is twin-core, three cores or four-core microstructured optical fibers.
Array optical tweezers of the present invention is to adopt such method to prepare:
Step 1; End face preparation: get one section multi-core fiber; Said multi-core fiber is that twin-core, three cores or four-core are protected inclined to one side microstructured optical fibers; The mode that adopts the hot melt vertebral pulling is drawn into the centrum shape with an end of this multi-core fiber, with the jewel cutter end face is cut flatly after cooling, and soon optical fiber end is prepared into vertebral body structure;
Step 2; Be of coupled connections: be that the other end of the multi-core fiber of vertebral body structure carries out overlay and dispels with the end for preparing; With the conventional welding of standard single-mode fiber; Carry out heat fusing then and draw awl operation, heat fusing to draw in the awl operating process to carry out optical power monitoring, up to the luminous power that is coupled to multi-core fiber reach maximum and each core light distribute power when even till;
Step 4; Screening operation: open LASER Light Source; Form the interference grid that fine and close space three-dimensional distributes at the vertebral body structure place of multi-core fiber; Form an optics potential well at each relevant hard point place, the suitable particulate of volume is captured in one by one in the optics potential well by stable, realizes the screening of microscopic particle.
Advantage of the present invention and characteristics are:
1. the present invention introduces the array optical tweezers control system with multi-core fiber; Utilize the interference grid light field of a plurality of optical waveguide fibre cores formation space distributions in the optical fiber; On the basis of practicing thrift physical space, also reduced the input optical power of system greatly, reduced injury particulate;
2. the present invention relevant strength that adds of being implemented in a multi-core fiber outgoing grid light field in the optical fiber forms a plurality of optics potential wells, can be used for to the screening of microscopic particle with handle in batches;
3. the present invention will realize the optics potential well that compact interference grid distributes through multi-core fiber, simply, effectively control the distribution of three-dimensional outgoing light field ligh trap power, realize the artificial subjective control of ligh trap power.
Description of drawings
Fig. 1 multi-core fiber array optical tweezers system architecture sketch (is example with the twin-core fiber).
Fig. 2 (a)-(c) multi-core fiber sectional view, wherein Fig. 2 (a) is that twin-core, Fig. 2 (b) are that three cores, Fig. 2 (c) are four-core.
The multi-core fiber end structure synoptic diagram that Fig. 3 vertebral pulling and cutting processing make (is example with three core fibres).
Embodiment
For example the present invention is done description in more detail below in conjunction with accompanying drawing:
Fig. 1 multi-core fiber array optical tweezers system architecture synoptic diagram.Be example with the twin-core polarization maintaining optical fibre among the figure, provide the system architecture synoptic diagram of this arrayed optical fiber light tweezer.Among the figure, 1 is multi-core fiber, and 1-1 is the multi-core fiber fibre core, and 1-2 is that 2 be standard single-mode fiber through the vertebra platform cutting-edge structure of heat fusing vertebral pulling and cutting preparation, and 3 be LASER Light Source, and 4 is multi-core fiber 1 and standard single-mode fiber 2 place that is of coupled connections.
Fig. 2 multicore microstructured optical fibers diagrammatic cross-section.The left side is a twin-core fiber among the figure, and the centre is three core fibres, and the right side is a four-core optical fiber, and dash area is represented fibre core among the figure.
Fig. 3 multi-core fiber vertebra you structural representation (is example with three core fibres).Among the figure, 1 is multi-core fiber, and 1-1 is the multi-core fiber fibre core, and 1-2 is through the vertebra platform cutting-edge structure of heat fusing vertebral pulling with the cutting preparation.The purpose of carrying out the heat fusing vertebral pulling at the multi-core fiber tip is in order the outgoing light field to be assembled, to be obtained the optics potential well of fine and close space interference network.
Array optical fiber optical optical tweezers system based on multi-core polarization-preserving fiber of the present invention comprises multi-core polarization-preserving fiber 1, standard single-mode fiber 2 and LASER Light Source 3.LASER Light Source 3 is connected with an end 2 routines of standard single-mode fiber, and the fusion vertebral pulling is of coupled connections between the other end of standard single-mode fiber 2 and the multi-core polarization-preserving fiber 1, and the other end of multi-core polarization-preserving fiber 1 becomes the centrum shape through fusion vertebral pulling processing and preparing.Multi-core fiber can be twin-core, three cores or four-core microstructured optical fibers; Multi-core fiber is a polarization maintaining optical fibre, and it is consistent and stable to guarantee that promptly light beam transmits the assurance polarization state in this optical fiber; Multi-core fiber 1 is connected with the mode of ordinary optic fibre 2 through fused biconical taper, the luminous power distribution of each fibre core in the monitoring multi-core fiber in the vertebral pulling process, and the luminous power that in each fibre core, is coupled into stops vertebral pulling when maximum and even; Multi-core fiber is with after standard single-mode fiber 2 is connected, and the other end is prepared the centrum shape again through the processing mode of fusion vertebral pulling, after cooling fiber end face is cut flatly, forms vertebra platform structure.
The manufacturing process of the arrayed optical fiber light tweezer based on multi-core polarization-preserving fiber of the present invention:
Step 1; The end face preparation: get one section multi-core fiber 1, this optical fiber can be that twin-core, three cores or four-core are protected inclined to one side microstructured optical fibers, and fibre core distributes as shown in Figure 2; The mode of employing hot melt vertebral pulling draws required centrum shape with an end of this multi-core polarization-preserving fiber 1; With the jewel cutter fiber end face is cut flatly after cooling, be about to optical fiber end and be prepared into vertebral body structure, as shown in Figure 3.
Step 2; Be of coupled connections: the opposite side that will prepare the multi-core fiber 1 of vertebra you structure carries out overlay and dispels; With the 2 conventional welding of common standard single-mode fiber; Carry out heat fusing then and draw awl operation, carry out optical power monitoring in the process, up to the luminous power that is coupled to multi-core fiber 1 reach maximum and each core light distribute power when even till.
Step 4; Screening operation: combine Fig. 1, after connecting according to said process, open LASER Light Source; Can form the interference grid that fine and close space three-dimensional distributes at the vertebra you place of multi-core fiber; Can form an optics potential well at each relevant hard point place, the suitable particulate of volume can be captured in one by one in the optics potential well by stable, realizes the screening of microscopic particle.
Claims (3)
1. array optical tweezers based on multi-core polarization-preserving fiber; Comprise multi-core polarization-preserving fiber, standard single-mode fiber and LASER Light Source; It is characterized in that: LASER Light Source is connected with an end of standard single-mode fiber; Fused biconical taper is of coupled connections between the other end of standard single-mode fiber and the multi-core polarization-preserving fiber, and the other end of multi-core polarization-preserving fiber is processed, with the jewel cutter end face cut the flat cone shape that is prepared into after cooling through fused biconical taper, is about to optical fiber end and is prepared into cone structure.
2. the array optical tweezers based on multi-core polarization-preserving fiber according to claim 1 is characterized in that: described multi-core polarization-preserving fiber is twin-core, three cores or four-core microstructured optical fibers.
3. preparation method based on the array optical tweezers of multi-core polarization-preserving fiber is characterized in that:
Step 1; End face preparation: get one section multi-core fiber; Said multi-core fiber is that twin-core, three cores or four-core are protected inclined to one side microstructured optical fibers; Adopt mode that hot melt draws awl that one end of this multi-core fiber is drawn into cone shape, with the jewel cutter end face is cut flatly after cooling, soon optical fiber end is prepared into cone structure;
Step 2; Be of coupled connections: be that the other end of the multi-core fiber of cone structure carries out overlay and dispels with the end for preparing; With the conventional welding of standard single-mode fiber; Carry out heat fusing then and draw awl operation, heat fusing to draw in the awl operating process to carry out optical power monitoring, up to the luminous power that is coupled to multi-core fiber reach maximum and each core light distribute power when even till;
Step 3, light source are injected: will be connected this array optical tweezers system of laser beam injection soon with LASER Light Source is conventional with the other end of standard single-mode fiber after multi-core fiber is of coupled connections;
Step 4; Screening operation: open LASER Light Source; Form the interference grid that fine and close space three-dimensional distributes at the cone structure place of multi-core fiber; Form an optics potential well at each relevant hard point place, the suitable particulate of volume is captured in one by one in the optics potential well by stable, realizes the screening of microscopic particle.
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