Method and device for suspending large-size particles based on photo-induced heating effect

Abstract

The invention discloses a method and device for suspending large-size particles based on a photo-induced heating effect. The suspension device comprises a single-beam suspension module, a vacuum module and a supporting module, the single-beam suspension module is used for constructing focused laser transmitted from bottom to top, the laser acts on particles to be suspended, temperature differenceis generated on two sides of the particles, and generated photo-induced heating acting force can overcome the gravity of the particles to enable the particles to be suspended in the air; the vacuum module is used for controlling the air pressure around the suspended particles to maximize the photo-induced heating acting force, and the supporting module is used for initially supporting the particles to enable the particles to freely fall to a to-be-captured area. According to the invention, the suspension of particles is completed by using the photo-induced heating effect, the defect that traditional light trap suspension can only capture small-size particles is overcome, and the suspension capture of large-size particles can be realized.

Description

technical field [0001] The invention relates to a method and a device for suspending large-sized particles based on a photoheating effect, and a method for achieving suspension capture by heating the particles with a laser to be subjected to thermal force. Background technique [0002] For the suspension capture method of particles, the most common method is to use focused laser light to form an optical trap, and use the optical trap force generated by light momentum transfer to overcome the gravity of the particle to suspend it in the air, but the suspension method based on the light trap force, light momentum transfer The generated force is small and can suspend particles up to 10-20 microns in size. [0003] In addition to the optical trapping force generated by the transfer of light momentum, after the particles are heated due to the absorption of laser light, they will also generate photoinduced heating forces. The specific principle is: when one side of the particle is...

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the defect that traditional optical traps are difficult to capture large-sized particles, the present invention proposes a method and device for suspending large-sized particles based on the photoheating effect

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