Regensburg 2013 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 34: Poster: Wetting, Micro and Nano Fluidics

CPP 34.1: Poster

Wednesday, March 13, 2013, 16:30–18:30, Poster C

3D-Velocimetry by Photonic Rutherford Scattering — •Markus Selmke and Frank Cichos — Universität Leipzig, molecular nanophotonics

We propose of a new kind of 3D-velocimetry using absorbing nanoparticles and a variant of photothermal single particle microscopy. Using a Quadrant photodiode detector we reveal that photons are deflected by a photonic potential which is created by a local refractive index change around a laser-heated absorbing nanoparticle. The deflection experienced is shown to be the analog to the deflection of a massive particle wave-packet in unscreened (spin-less) Coulomb scattering, i.e. the quantum mechanical analog to Rutherford Scattering. The experimentally found focal detection geometry reveals an adjustable lateral split sub-volume feature which allows new (cross-) correlation-based 3D-velocimetry experiments of absorbing particles with ultra-high sensitivity.