Scattering of a high-order vector Bessel Gaussian beam by a spherical marine aerosol. (May 2021) - Shi, Chenge
Highlights: Beam shape coefficients of high-order vector Bessel-Gaussian beams are derived. Incident beam and scatterer parameters can highly influence the scattering results. It is not feasible to recognize the relative humidity of aerosol environment by using the differences of scattering intensities. Abstract: 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 (H-VBGB), 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.