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Q: Fachverband Quantenoptik und Photonik

Q 9: Photonics I

Q 9.8: Talk

Monday, March 18, 2013, 15:45–16:00, A 310

Photonic Rutherford Scattering — •Markus Selmke and Frank Cichos — Universität Leipzig, molecular nanophotonics

We show that the quantum mechanical (QM) description of Rutherford scattering has a photonic counterpart in a new form of single particle photothermal (PT) microscopy. Using a split detector we provide experimental evidence, 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. The experimentally found focal detection geometry reveals an adjustable lateral split sub-volume feature which allows new correlation-based 3D-velocimetry experiments of absorbing nanoparticles with ultra-high sensitivity. Further, a framing of the whole spectrum of phenomena in PT single particle microscopy into the well-known QM scattering framework is hereby achieved.