Abstract
Mie theory is widely used for the simulation and characterization of optical interaction with scattering media, such atmospheric pollutants. The complex refractive index of particle plays an important role in determining the scattering and absorption of light. Complex optical fields, such as vortex beams, will interact with scattering particulates differently to plane wave or Gaussian optical fields. By considering the three typical aerosol particles compositions that lead to haze in the atmosphere, distinctive scattering dynamic were identified for vortex beams as compared to Gaussian beams. Using parameters similar to real world atmospheric conditions, a new aerosol particle model is proposed to efficiently and concisely describe the aerosol scattering. Numerical simulations indicate unique signatures in the scattering dynamics of the vortex beams that can indicate particles composition and also suggest that potentially there is higher optical transmission of vortex beams propagating in certain hazy environments.
Highlights
Aerosol pollution has influenced the atmospheric environment, e.g., alterations of the local weather [1,2,3] and the deterioration of visibility and air quality [4]
This study investigated the scattering models of vortex beams in hazy atmosphere for three typical aerosol particles and analyzed their absorption and scattering characteristics
Numerical simulations indicate that the complex refractive index of aerosol particles play an important role in determining the scattering and absorption characteristics of vortex beams
Summary
Aerosol pollution has influenced the atmospheric environment, e.g., alterations of the local weather (and climate) [1,2,3] and the deterioration of visibility and air quality [4]. Based on the generalized Lorenz-Mie theory (GLMT) [12], the scattering problem of elliptical beams can be solved [13,14], and the scattering models of spherical coated and multilayered particles located in an arbitrary beam have been developed [15,16] When it comes to the light scattering of non-spherical aerosol particles (arbitrary shapes or aggregation particles), several numerical computation methods have been adopted, such as Finite-difference time domain (FDTD) method [17], Discrete Dipole Approximation, Ray Tracing [18], physical-geometric optics hybrid method [19], and so on. The interaction mechanism between particles and vortex beams has hardly been applied to aerosol environments, Huang [32] investigated the scattering and polarization characteristics of marine atmospheric aerosol illuminated by HG incident beams using an equivalent humidity model. A geometric relationship is proposed to modified the description model of aerosol and proved that can achieve the purpose of better describing the physical characteristic of deliquescence in a neutral manner
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