Mainz 2017 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 20: Nano-Optics II
Q 20.7: Talk
Tuesday, March 7, 2017, 12:30–12:45, P 11
Measuring the Polarizability of Individual Nanoparticles — •Matthias Mader1,2, Theodor W. Hänsch1,2, and David Hunger1,2,3 — 1Ludwig-Maximilians-Universität München, Schellingstraße 4, 80799 München — 2Max-Planck-Insitut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching — 3KIT, Physikalisches Institut, Wolfgang-Gaede-Straße 1, 76131 Karlsruhe
Optical characterisation of individual nanosystems gives deep insight into their chemical and physical structure. Getting spectroscopy signals beyond flourescence on a single particle level is very demanding. Here we present a method to quantitatively retrieve the full polarizability tensor of an individual nanosystem within a single measurement using a Fabry-Perot microcavity. [1].
The cavity is built of a micro-machined and high-reflective coated end facet of a single mode optical fibre and a macroscopic plane mirror. By scanning it with respect to the fibre tip, the cavity mode is used as an ultra-sensitive spatially resolving probe for the optical properties of a sample placed on top of the plane mirror. We measure differential frequency shifts as well as the linewidth of several cavity modes to simultaneously infer the sample extinction and dispersion. Combining extinction and dispersion measurements allow for reconstruction of the polarizability tensor of individual paricles.
[1] D. Hunger, T. Steinmetz, Y. Colombe, C. Deutsch, T. W. Hänsch, J. Reichel, New J. Phys. 12, 065038 (2010)
[2] M. Mader, J. Reichel, T. W. Hänsch, D. Hunger, Nature Commun. 6 7249 (2015)