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Method and devicefor capturing and manipulating particles through a partially coherent light beam

A technology of coherent beams and particles, applied in the field of particle capture and manipulation, which can solve problems such as inability to achieve

Active Publication Date: 2021-04-13
SHANDONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) It can only capture and manipulate particles at the same position;
[0006] (2) Only the same kind of particles can be captured and manipulated;
[0007] Therefore, if you want to capture different particles at multiple locations, the existing technology cannot achieve

Method used

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  • Method and devicefor capturing and manipulating particles through a partially coherent light beam
  • Method and devicefor capturing and manipulating particles through a partially coherent light beam
  • Method and devicefor capturing and manipulating particles through a partially coherent light beam

Examples

Experimental program
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Embodiment 1

[0033] This embodiment provides a device for trapping and manipulating particles with partially coherent light beams, including:

[0034] Special correlation structures, particle capture modules and imaging modules;

[0035] Partially coherent beams generated by the special correlation structure are incident on the particle capture module, and the partially coherent beams are strongly focused by the particle capture module, and the beams will form multiple stable optical potential wells with different properties near the focal point. The trap captures particles with different refractive indices at multiple positions simultaneously, and displays them on the imaging module, and at the same time manipulates the particles by modulating the partially coherent beam building blocks.

[0036] As one or more examples, such as figure 1 As shown, the special associated structure includes: sequentially setting a helium-neon laser, a beam expander, a linear polarizer, a spatial light modu...

Embodiment 2

[0040] This embodiment provides a method for trapping and manipulating particles with a partially coherent beam, including:

[0041] Using the above-mentioned device for trapping and manipulating particles with partially coherent beams, a beam of partially coherent light with a special correlation structure is strongly focused through a lens, and the beams will form multiple stable optical potential wells with different properties near the focus. The trap traps particles with different refractive indices at multiple locations simultaneously, and manipulates the particles by adjusting special correlation structures.

[0042] The specific theoretical process of the Laguerre non-uniform correlation (LNUC) beam is:

[0043] In the spatial frequency domain, scalar partially coherent beams are characterized by the cross spectral density function:

[0044] W(r 1 ,r 2 )=* (r 1 )E(r2 )> (1)

[0045] where E is the instantaneous electric field. are any two position coordinates on...

Embodiment approach

[0080] Specific implementation plan: based on the above theoretical basis analysis, such as figure 2 As shown, the Laguerre non-uniform correlated beam with a beam waist width of 3 cm is selected, and it is strongly focused through a lens with a focal length of 5 mm, and the Rayleigh particles with a refractive index of 1.59 and a radius of 50 nm are processed in an environment with a refractive index of 1.33. capture and manipulation.

[0081] like image 3 and Figure 4 As shown, the scattering force and gradient force of the strongly focused Laguerre non-uniform correlated beam are much greater than the Brownian force generated by thermal motion, and the influence of Brownian force on the particles can be completely ignored, so the particles can be stably trapped. At the same time according to figure 2 (b) and figure 2 (f) It can be seen that there are three stable trapping points on the optical axis. At point A and point B, particles with a refractive index larger t...

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Abstract

The invention provides a method and device for capturing and manipulating particles through a partially coherent light beam. The device comprises a special correlation structure, a particle capturing module and an imaging module. The special correlation structure generates the partially coherent light beam to enter the particle capture module, the particle capture module performs strong focusing on the partially coherent light beam, the light beam forms a plurality of stable optical potential traps with different properties near a focal point, the optical potential traps capture particles with different refractive indexes at a plurality of positions at the same time and display the particles on the imaging module. Meanwhile, the particles are manipulated by regulating and controlling a partially coherent light beam construction module.

Description

technical field [0001] The disclosure belongs to the field of particle trapping and manipulation, and in particular relates to a method and device for trapping and manipulating particles with partially coherent light beams. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] The photoradiative force arises from the momentum exchange between the photon and the particle when incident light is scattered by a particle as a whole. One of Ashkin's greatest works is the single-beam gradient force optical trap of dielectric particles ranging in size from Mie particles to Rayleigh particles. In this optical trap, a strongly focused laser beam is required to obtain a stable single-beam axial trap. In 1970, Ashkin demonstrated for the first time how to use radiation pressure to trap and manipulate tiny particles. Since then, a large number of theoret...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21K1/00
CPCG21K1/006
Inventor 徐颖刘永雷蔺淑琴蔡阳健余佳益
Owner SHANDONG NORMAL UNIV
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