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Heng Zhang

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Proceedings Article | 4 January 2023 Poster + Presentation + Paper

Analysis light scattering properties of particles with porous structure based on discrete dipole approximation

Heng Zhang, Nan Zeng, Hui Ma

Proceedings Volume 12322, 123220T (2023) https://doi.org/10.1117/12.2644117

KEYWORDS: Particles, Polarization, Light scattering, Atmospheric particles, Scattering, Solid modeling, Analytical research, Algorithm development, 3D modeling, Spherical lenses

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Atmospheric suspended particles are an important component of atmospheric pollutants and pose a great threat to human health and the ecological environment. Suspended particles have various properties such as wide size distribution, complex composition and morphology (including porous structure). Particles with porous structure usually have a larger internal surface area and will adsorb more toxic substances. In the present work, we developed an algorithm to generate particles with porous structure and adjustable pore size. Then we used Discrete Dipole Approximation (DDA) method to calculate the light scattering matrix of particles with different pore sizes and study the effect of pore size on their light scattering properties. In order to obtain polarization indicators to characterize pore size, measured the polarization scattering signals of porous particles at four different angles, namely 30°, 60°, 85° and 115°. The combination of simulation and experimentation provides the basis for future identification of porous particles and differentiation of particles with different pore sizes. This work will facilitate real-time monitoring of porous particles with high adsorption capacity of toxic and hazardous substances in the field of environmental protection.

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