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A method and device for manipulating optical tweezers based on hollow optical size adjustment

A technology of size adjustment and hollow light, applied in the field of nonlinear optics, can solve the problems of high price, damage to physical machine, and inability to achieve precise control, etc., and achieve the effect of easy operation, avoiding light damage, and simple structure

Inactive Publication Date: 2020-03-27
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have their own defects, which can be mainly divided into three categories: one is that the relative position of the beam space cannot be precisely controlled, and the particle can only move in this direction without precisely controlling its stop position; For some particles with a low optical damage threshold, the physical machine will be damaged by changing the beam intensity, which is not conducive to real-time in-situ research on the surface properties of the particles; the structure of the three-light source generation device is complex and expensive

Method used

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  • A method and device for manipulating optical tweezers based on hollow optical size adjustment
  • A method and device for manipulating optical tweezers based on hollow optical size adjustment
  • A method and device for manipulating optical tweezers based on hollow optical size adjustment

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Embodiment 1

[0033] According to the above-mentioned technical scheme, the present invention discloses a method for manipulating optical tweezers based on hollow optical size adjustment, which includes the following steps:

[0034] Step 1, obtaining a modulated laser beam 1 and focusing it in a nonlinear medium 6;

[0035] Step 2, obtaining another beam of modulated laser beam 2 and incident it in the nonlinear medium 6 in step 1, and then entering the optical tweezers system after passing through the first polarization beam splitting cube 5;

[0036] Specifically, the modulated laser beam 2 is incident on the nonlinear medium 6 described in step 1, so that it propagates anti-collinearly with the modulated laser beam 1 described in step 1, and the modulated laser beam 2 travels from the nonlinear medium 6 enters the optical tweezers system through the first polarization beam splitting cube 5 after exiting.

[0037] Step 3, adjusting the light intensity of the modulated laser beam 1 and th...

Embodiment 2

[0049] Such as figure 1 As shown, the present embodiment provides an optical tweezers manipulation device based on hollow light size adjustment, including a focusing lens 3, a first half-wave plate 4, a second half-wave plate 7, a first polarization splitting cube 5, a second polarization The beam-splitting cube 8, the nonlinear medium 6 and the optical tweezers system, the focusing lens 3, the first half-wave plate 4, the first polarization beam-splitting cube 5, the nonlinear medium 6 and the second polarization beam-splitting cube 8 are sequentially arranged on the horizontal plane of the same optical path propagation , the second half-wave plate 2 is located directly above the second polarization beam-splitting cube 8 , and the optical tweezers system is located below the first polarization beam-splitting cube 5 .

[0050] The optical tweezers system in the present embodiment comprises a high reflection mirror 9, a second focusing lens 10, a third focusing lens 11, a third...

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Abstract

The invention provides an optical tweezers manipulation method and device based on size adjustment of hollow light, comprising: injecting a modulated laser beam and another modulated laser beam into a nonlinear medium to obtain hollow light; expanding the hollow light After the beam is collimated, it passes through a third polarization beam splitter cube and is divided into two sub-hollow lights; the two sub-hollow lights are the first sub-hollow light and the second sub-hollow light; the first sub-hollow light is incident into the first imaging device; The second sub-hollow light is converged into the sample pool through the fourth focusing lens, and sample particles are sprayed into the sample pool, and the sample particles are captured by the second sub-hollow light in its optical trap position; by adjusting the light intensity of the modulated laser beam to Regulate the movement of sample particles. The invention changes the phase of the modulated laser beam by modulating the laser beam, so that the far-field light intensity distribution of the modulated laser beam is shown as a circle of high-intensity laser light with zero intermediate intensity, and then uses the adjustable hollow beam to The light-absorbing particles are used for three-dimensional manipulation.

Description

technical field [0001] The invention belongs to the application field of nonlinear optics, and in particular relates to an optical tweezers manipulation method and device based on hollow optical size adjustment. Background technique [0002] Optical tweezers refer to a microscopic manipulation technology that uses lasers to manipulate micron and submicron particles. Usually its operation is carried out in liquid, which has little effect on the operation of particles in the air. Then, according to the basic principle of photophoretic force, the three-dimensional operation of particles was successfully realized in the air by using two or more light beams. In the field of optics, a hollow beam refers to a beam whose transverse amplitude distribution satisfies a high-order Bessel function, and its transverse light intensity distribution appears as a series of concentric rings with a dark center. Hollow light traps light-absorbing particles in their dark regions according to th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/09G02F1/35G21K1/00
CPCG02B27/0927G02B27/0938G02B27/0955G02F1/3511G21K1/006
Inventor 程雪梅陈浩伟贺博张倩白晋涛
Owner NORTHWEST UNIV
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