Göttingen 2025 – scientific programme

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P: Fachverband Plasmaphysik

P 16: Complex Plasmas and Dusty Plasmas II

P 16.5: Talk

Wednesday, April 2, 2025, 17:15–17:30, ZHG006

Modern imaging polarimetry as diagnostics for plasma-grown nanoparticles: Challenges and first results — •Alexander Schmitz, Andreas Petersen, and Franko Greiner — IEAP, Kiel University, Kiel, Germany

Full-Stokes Mie polarimetry is an established diagnostic technique for plasma-grown nanoparticles. It enables the in situ measurement and monitoring of the particle size and complex refractive index. Both parameters are also essential for other diagnostics, such as dust density measurements via extinction. Expanding prior 1D measuring techniques to an imaging polarimeter system presents a number of challenges, such as precise alignment and impurities and aberrations in commercially available polarization optics.

To solve this, a calibration method based on the null-space method for the device's transfer matrix has been applied to a new high-resolution, imaging polarimeter. First 2D polarisation measurements on a dust cloud have been conducted and the spatial and temporal evolution of the particle size evaluated.

Keywords: nanoparticles; polarimetry; dusty plasma; mie scattering; plasma diagnostics