Influence of activity on extinction characteristics of non-spherical bioparticle aggregates

The influence of biological activity on the extinction properties of bioparticle materials remains unclear, despite its significance. In this work, according to the alterations in the absorption functional groups and the monomer shape of bioparticles before and after deactivation, the complex refractive indices are obtained using the Kramers-Kronig relation, and the mass extinction coefficients of non-spherical bioparticle aggregates are calculated using the discrete dipole approximation method and verified by smoke box experiments. The results show that the main reason for the decrease of extinction performance is the decrease of scattering ability. For future research with the non-spherical bioparticle aggregates, it would be valuable to consider the monomer shape for quantitative determination of activity based on the mass extinction coefficients.