Research On Microparticle Arrangement Based On Laser-induced Thermal Convection Effect

Optical tweezers technology is an emerging technology developed in recent years to study microparticles on a microscopic scale.It plays an important role in many fields such as biomedicine and physics because of its non-contact,no damage and many other advantages.This paper proposes a microparticle arrangement method based on laser-induced thermal convection effect.It combines thermal steering and fiber optic diaphragm technology using fiber-coupled methods.By using only one fiber,we realize not only the manipulation of a large number of microparticles,but also the precise manipulation of individual microparticles,and achieve the regular and special arrangement of the microparticles in space.Firstly,the function of the microparticle arrangement method based on laser-induced thermal convection effect is designed,whose simulation results are obtained by analyzing and calculating this physical process.The optical trap force is calculated using the finite difference time domain method and the basic principles of heat transfer and fluid dynamics are briefly described.Secondly,according to the experimental needs,the instrument with the appropriate parameters is selected to build the experimental platform.The source of the appropriate wavelength and power is chosen by setting the criteria for the laser source.In addition,several methods for processing fiber optic probes are outlined in this paper.The temperature of the experimental environment is measured using a fluorescence method.Thirdly,on the basis of the functional design and experimental platform construction of the manipulation technology,experimental researches are carried out including the regular and multi-layer arrangement of a large number of microparticle,manipulation of single microparticle,separating and sorting microparticles of different sizes.In addition,we also achieves the special shape alignment manipulation of microparticles in space,which combines fiber optic diaphragm technology with thermal effect capture manipulation technology.