Optical tweezers control method based on hollow light dimension adjustment and optical tweezers control device based on hollow light dimension adjustment

Abstract

The invention provides an optical tweezers control method based on hollow light dimension adjustment and an optical tweezers control device based on hollow light dimension adjustment. The optical tweezers control method comprises the steps that one modulated laser beam and another modulated laser beam are incident to a nonlinear medium and hollow light is acquired; the hollow light is expanded andcollimated and then divided into two beams of child hollow light through a third polarizing beam splitting cube; the two beams of child hollow light is the first child hollow light and the second child hollow light; the first child hollow light is incident to a first imaging device; the second child hollow light is converged to a sample pool through a fourth focusing lens, wherein sample participles are sprayed in the sample pool and the sample participles are captured at the light trap position by the second child hollow light; and movement of the sample participles is adjusted by adjustingthe light intensity of the modulated laser beams. The phase of the modulated laser beams is changed by the modulated laser beams so that the modulated laser beam far field light intensity distributionpresents in a way that the middle intensity is zero and the surrounding is a circle of high intensity laser, and then three-dimensional operation is performed on the light absorbing particles in theair by using the dimension adjustable hollow light beams.

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...

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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

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