Simulation Research On Polarization Transmission Characteristics Of Non-spherical Particles Based On T-matrix

In the transmission process,natural light will generate polarized light due to the scattering of the medium.Polarization is an important attribute of light,and it carries a wealth of target information.Light scattering of non-spherical particles is very important and complex,and it has always been a hot topic in the study of optical properties of particles at home and abroad.Researching the polarization transmission characteristics of non-spherical particles has important implications for solving non-spherical problems and developing a more suitable climate model.In view of the ubiquitous non-spherical problem,the polarization transmission characteristics of non-spherical particles are taken as the main research object.When the Tmatrix algorithm is applied to the three non-spherical particles of ellipsoidal,cylindrical,and Chebyshev as natural light transmission media,the polarization of light The characteristics of the particles were simulated with the morphological,dimensional,and physical parameters(refractive index)of the particles.The polarization characteristics were simulated with the regularity of the morphological parameters,size parameters,and physical property parameters(refractive index)of the particles.Secondly,the spherical particle scattering parameters calculated by T-matrix method and Mie scattering theory method are compared to verify the validity of T-matrix algorithm.Comparing calculation results of equivalent spherical method based on Mie scattering theory to calculate the polarization properties of non spherical particles with the T matrix,calculating degree of polarization error with the method of equivalent spherical,analyzing the effect of particle shape and size on the error of calculating the polarization characteristics by the equivalent spherical method.The following conclusions are drawn: The increase of the real part of the refractive index will make the maximum value of the polarization degree of non-spherical particles decrease;the polarization degree curve corresponding to the three kinds of particles will follow similar rules as the imaginary part of the refractive index of the particles increases.The degree of polarization is less and less affected by the shape of the particles,and when the imaginary part of the refractive index is large enough,the degree of polarization is positive(except for the 0 and 180 degree scattering angle positions);when the effective radius increases,the maximum value of the degree of polarization of the particles decreases;the polarization degree error caused by the equivalent spherical method is affected by the shape and size of the particles.The effect of shape of the particles on the polarization error is mainly reflected in the backscattered region.The error is related to the size of particles.