# In-situ analysis of optically thick nanoparticle clouds

## TL;DR

This paper introduces a novel 3D Monte Carlo radiative transfer simulation method for analyzing optically thick nanoparticle clouds, enabling in-situ diagnostics where multiple scattering effects are significant.

## Contribution

It presents the first 3D polarized radiative transfer simulations for dense nanoparticle clouds, extending existing diagnostics to account for multiple scattering effects.

## Key findings

- First 3D Monte Carlo polarized radiative transfer model for dense nanoparticle clouds.
- Enables in-situ nanoparticle analysis considering multiple scattering.
- Improves accuracy of nanoparticle property diagnostics in dense plasmas.

## Abstract

Nanoparticles grown in reactive plasmas and nanodusty plasmas gain high interest from basic science and technology. One of the great challenges of nanodusty plasmas is the in-situ diagnostic of the nanoparticle size and refractive index. The analysis of scattered light by means of the Mie solution of the Maxwell equations was proposed and used as an in-situ size diagnostic during the past two decades. Today, imaging ellipsometry techniques and the investigation of dense, i. e. optically thick nanoparticle clouds demand for analysis methods to take multiple scattering into account. We present the first 3D Monte-Carlo polarized radiative transfer simulations of the scattered light in a dense nanodusty plasma. This technique extends the existing diagnostic methods for the in-situ analysis of the properties of nanoparticles to systems where multiple scattering can not be neglected.