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When considering particles produced in reactive plasmas, their basicproperties, such as refractive index and grain size often need to be known.They can be constrained both ex-situ, e.g., by microscopy, and in-situ bypolarimetry, i.e., analyzing the polarization state of scattered light.Polarimetry has the advantage of temporal resolution and real-time measurement,but the analysis is often limited by the assumption of single scattering andthus optically thin dust clouds. This limits the investigation of the growthprocess typically to grain sizes smaller than about 200 nm. Using 3D polarizedradiative transfer simulations, however, it is possible to consider multiplescattering and to analyze the properties of dense particle clouds.  We study the impact of various properties of dust clouds on the scatteringpolarization, namely the optical depth of the cloud, the spatial densitydistribution of the particles, their refractive index as well as the particlesize dispersion. We find that ambiguities can occur regarding optical depth andspatial density distribution as well as regarding refractive index and particlesize dispersion. Determining the refractive index correctly is especiallyimportant as it has a strong impact on the derived particle sizes. With thisknowledge, we are able to design an in-situ diagnostics strategy for theinvestigation of the particle growth process based on radiative transfersimulations which are used to model the polarization over the whole growthprocess. The application of this strategy allows us for the first time toanalyze the polarization measured during a growth experiment in a reactiveargon-acetylene plasma for particle radii up to 280 nm.

Radiative transfer simulations for in-situ particle size diagnostic in reactive, particle growing plasmas