Berlin 2014 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 18: Laser development and applications III

Q 18.2: Talk

Tuesday, March 18, 2014, 10:45–11:00, DO26 207

Single particle interferometry in the generalized Lorenz-Mie framework — •Markus Selmke, Irene Neugebauer, and Frank Cichos — Universität Leipzig, Linnéstr. 5, 04103 Leipzig

The change in laser transmission due to spherical particles under tightly-focused illumination is probably the most conveniently measurable quantity in optical microscopy setups. Sensitive techniques such as the spatial modulation spectroscopy for extinction spectroscopy, molecular sensors applications and photothermal single particle microscopy for absorption-based imaging have been put forward. The incidence beam interferes with the scattered field provides a contrast which contains detailed information about the scatterer itself and the illuminating focused field point-spread-function. However, a convenient framework for the description of such transmission signals for large particles, e.g. thermal lenses, was missing so far. Here, we present an extension of the generalized Lorenz-Mie theory which delivers such transmission signals for nanoparticle characterization and robust PSF mapping, alongside the commonly computed radiation forces and total cross-sections.