Light capture and three-dimensional control device for light absorption particles in air based on hollow light

Abstract

The invention discloses a light capture and three-dimensional control device for light absorption particles in air based on hollow light. The device comprises a laser, a hollow light generation unit and a polarizing beam splitter which are arranged in sequence; the device further comprises an illumination unit, a transverse capture unit and a vertical capture unit; the transverse capture unit comprises a first deflection mirror, and the vertical capture unit comprises a second deflection mirror. Through the first deflection mirror and the second deflection mirror which are rotatably arranged in the transverse capture unit and the vertical capture unit respectively, captured particles can rotate in a transverse plane and a vertical plane which are perpendicular to the propagation direction of captured laser in a two-dimensional manner, and the rotation direction is controllable; the problem that the rotation direction of light absorption particles cannot be controlled under low capturing power when the light absorption particles in air are captured in the prior art is solved; and in addition, the hollow light is adopted to capture the light absorption particles, and the capture power can be as low as 25mW, so that the problem that the light energy captured by the particles in the two-dimensional rotation process is too high is solved.

Description

technical field [0001] The invention belongs to the field of nonlinear optics application, and relates to a light trapping and three-dimensional manipulation device, in particular to a light trapping and three-dimensional manipulation device for light-absorbing particles in air based on hollow light. Background technique [0002] The optical trapping and manipulation of light-absorbing particles has attracted attention in recent years with the increasing demand for in situ analysis of air pollution particles. Among them, high-precision three-dimensional optical manipulation is a challenging technology, because the trapped particles need to be displaced to the focal position of the excitation laser for spectral analysis. Currently, the manipulation of particles along the z-direction (propagation direction of the trapping laser) is usually achieved by changing the power of the trapping laser. However, this method of displacement requires a large trapping laser power. And due...

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Problems solved by technology

[0004] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a light-capturing and three-dimensional manipulation device for light-absorbing particles in the air based on hollow light, which solves the problem that the light-absorbing particles in the air cannot be captured at a low temperature in the prior art. The technical problems of controlling the rotation direction of particles under the trapping power and the inability to realize one-dimensional manipulation and two-dimensional rotation of trapped particles at the same time

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