Multiple light forceps integrated on simple optical fiber

A single-fiber, optical tweezers technology, applied in the field of optical tweezers, can solve the problem that the capture force of the single-fiber optical tweezers cannot be further increased, and achieve the effects of improving the capture characteristics, low price, and increasing the cross angle.

Inactive Publication Date: 2008-08-27
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, further studies have shown that the capture force of single-fiber optical tweezers with this structure cannot be further increased, and can only achieve three-dimensional capture of smaller-scale particles, and can only capture a single particle

Method used

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  • Multiple light forceps integrated on simple optical fiber
  • Multiple light forceps integrated on simple optical fiber
  • Multiple light forceps integrated on simple optical fiber

Examples

Experimental program
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Effect test

Embodiment 1

[0043] The following describes the implementation of the combination and integration of axially symmetrical wedge-shaped multi-fiber optical tweezers based on the principle of beam refraction, as shown in FIG. 6 and FIG. 7 . The method of combining and integrating the multi-fiber optical tweezers is realized by using the six-core optical fiber with axisymmetric linear geometric distribution and grinding the end faces thereof. The wedge-shaped grinding processing method of the six-core optical fiber is as follows:

[0044] (1) Select a six-core optical fiber with the above structure, remove the coating layer, clean it with a mixture of alcohol and ether, and set it aside;

[0045] (2) Put a certain size of polishing sandpaper on the polishing disc on the optical fiber end grinder, fix the cleaned six-core optical fiber, and place one end on the grinding disc;

[0046] (3) Rotate the optical fiber so that the fiber core line is in a plane perpendicular to the grinding disc, and...

Embodiment 2

[0052] The following describes the implementation of the combination and integration of axially symmetrical quadrangular pyramidal multi-fiber optical tweezers based on the principle of total reflection-refraction, as shown in Figure 8 and Figure 9 . The structure of the multi-core optical fiber is based on the six-core optical fiber with linear geometric distribution, and two cores are added in the vertical direction to form a 10-core optical fiber. The combination and integration of multi-fiber optical tweezers can be realized by grinding and processing them. The grinding process of the quadrangular cone of the 10-core optical fiber is as follows:

[0053] Wherein steps (1) to (4) are identical with the grinding process of wedge-shaped end;

[0054] (5) After one side of the optical fiber is polished, the optical fiber is rotated 90° along the axis. At this time, the size of the grinding angle θ can be reset through the program to realize the grinding and polishing of the o...

Embodiment 3

[0058] The combination and integration of multi-fiber optical tweezers can also be realized by using 9-core optical fibers distributed axially symmetrically, as shown in Figure 10. The implementation method and process are similar to those in Example 1, except that it is necessary to grind and process an axially symmetrical triangular cone fiber end structure according to the geometric distribution symmetry of the core in the optical fiber. The three lateral grinding angles of the optical fiber need to be the same, but you can choose a complementary angle larger than the critical angle of total reflection to achieve direct refraction focusing, or you can choose a complementary angle smaller than the critical angle of total reflection to achieve total reflection-refractive focusing.

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Abstract

The invention provides a multiple optical tweezers integrated with a single fiber, comprising a multi-core fiber 1 having a plurality of fiber cores 2 in a public cladding, wherein, a multi-angular wedge with a symmetric shape or an asymmetric shape is formed on one end of the multi-core fiber through a grinding process, a large gradient optical field switch region is formed by a side 3 of the multi-angular wedge and a head face 6 of the fiber. Compared with other optical tweezers, improvements of the invention is mainly reflected in: (1) inventing the optical tweezers using the multi-core fiber to trap a plurality of small particles at the same time, and implementing a modification of an optical potential well and an amount of captured particles through adjusting the number of fiber cores; (2) inventing an implementation of simultaneous trapping of a plurality of small particles with different space geometrical arrangements through adjusting the structure of geometrical arrangement of the fiber cores; (3) greatly improving the trapping force of the optical potential well based on a light beam total reflection-refraction focusing principle. Based on the improvements, the invention implements a combination and an integration of multiple fiber optical tweezers, and makes the trapper character of the optical tweezers greatly improved.

Description

(1) Technical field [0001] The invention relates to an optical tweezers, in particular to a combined fiber integrated multi-fiber optical tweezers. (2) Background technology [0002] Light is considered to be a flow of photons that is both particle and wave, and it has both mass and momentum. When an object interacts with an optical radiation field, it experiences an optical radiation force. The light field whose intensity changes drastically in space will transform the light radiation force into a gradient force, and trap the particles stably at the maximum light intensity, that is, the focal position of the beam. Using this property can realize non-contact precision manipulation of particles, and the device that can accomplish this function is called optical tweezers. Since 1970, Ashkin of Bell Laboratories in the United States observed the radiation force of laser for the first time in an experiment, and successfully used laser to complete the experiment of particle sus...

Claims

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Application Information

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IPC IPC(8): G02B6/036G01N15/00G01N37/00G21K1/00
Inventor 苑立波杨军刘志海
Owner HARBIN ENG UNIV
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