Scattering of a high-order vector Bessel Gaussian beam by a spherical marine aerosol

Based on the generalized Lorenz-Mie theory (GLMT) and the angular spectrum decomposition method (ASDM), we derive the beam shape coefficients (BSCs) of high-order vector Bessel Gaussian beams (HVBGB), and investigate the interaction mechanism of H-VBGB illuminating a spherical marine aerosol. Linear (x, y), circular (left, right), azimuthal and radial polarizations are considered. The effects of various parameters characterizing the incident beam and the aerosol on the normalized differential scattering cross section (DSCS) are investigated. Numerical results show that the normalized DSCS is very sensitive to fluctuations in the parameters, and that the distinctions of incident beams may highly influence results. The relative humidity of aerosol performs similar effects on results for all polarizations, so it is not feasible to recognize the relative humidity of aerosol environment by using the differences of normalized DSCS for various polarization states. We provide a reference for the practical use of the scattering features of non-diffractive beams illuminating spherical calibrators. (C) 2021 Published by Elsevier Ltd.

Automated summary

This study derives the beam shape coefficients of HVBGB and investigates the interaction mechanism with spherical marine aerosols using GLMT and ASDM. The sensitivity of normalized DSCS to parameter fluctuations and the significant influence of differences in incident beams on results are highlighted. The study also emphasizes the inability to recognize the relative humidity of aerosol environment solely based on the differences in normalized DSCS for various polarization states.