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Heidelberg 2015 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 62: Poster: Quantum Optics and Photonics III

Q 62.52: Poster

Donnerstag, 26. März 2015, 17:00–19:00, C/Foyer

A Scanning Cavity Microscope — •Matthias Mader1,2, Jakob Reichel3, Theodor W. Hänsch1,2, and David Hunger1,21Ludwig-Maximilians-Universität München, Fakultät für Physik, Schellingstraße 4, 80799 München — 2Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching — 3Laboratoire Kastler Brossel, ENS/UPMC-Paris 6/CNRS, 24 rue Lhomond, F-75005 Paris

We present a versatile tool for ultra-sensitive and spatially resolved optical characterization of single nanoparticles.

Using signal enhancement in a scanning optical microcavity made of a micromachined optical fiber and a plane mirror [1] together with higher order cavity modes, we measure the polarization dependent extinction and polarizability of a single nanoparticle. Harnessing multiple interactions of probe light with a sample within the optical resonator, we achieve a 1700-fold signal enhancement compared to diffraction-limited microscopy [2]. We demonstrate first quantitative simultaneous measurements of the extinction cross section and polarizability of a single nanoparticle.

These measurements demonstrate the potential of our technique for very sensitive imaging of dispersive nanoparticles like viruses or biomolecules.

[1] D. Hunger, T. Steinmetz, Y. Colombe, C. Deutsch, T. W. Hänsch and J. Reichel, New J. Phys. 12, pp. 065038(2010) [2] M. Mader, J. Reichel, T. W. Hänsch and D. Hunger, arXiv preprint arXiv:1411.7180 (2014)

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