Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 30: Poster: Photonics, laser development and applications, ultrashort laser pulses, quantum effects

Q 30.25: Poster

Dienstag, 18. März 2014, 16:30–18:30, Spree-Palais

A Scanning Cavity Microscope — •Matthias Mader1,2, Thomas Hümmer1,2, Hanno Kaupp1,2, Jakob Reichel3, Theodor W. Hänsch1,2, and David Hunger1,21Ludwig-Maximilians-Universität München, Schellingstraße 4, 80799 München — 2Max-Planck-Insitut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching — 3Laboratoire Kastler-Brossel, ENS, CNRS, UPMC, 24 rue Lhomond, 75005 Paris

We present a novel tool for ultra sensitive and spatially resolved absorption spectroscopy on nanoscale objects. To boost sensitivity, multiple interactions of probe light with an object are realized by placing the sample inside a high finesse scanning optical microcavity. It is based on a laser machined and mirror-coated end facet of a single mode fiber and a plane mirror forming a fully tunable open access Fabry-Perot cavity [1, 2]. Scanning the sample placed on the plane mirror through the cavity mode yields a spatial map of absorptivity of the sample.

We show proof-of-principle experiments with individual gold nanospheres, demonstrating very sensitive absorption and dispersion measurements.

Our results open the perspective to use scanning cavity microscopy as a versatile tool for spectroscopy on weakly absorbing nanoparticles, for bio sensing, and single molecule detection.

[1] D. Hunger, T. Steinmetz, Y. Colombe, C.Deutsch, T. W. Hänsch and J. Reichel, New J. Phys. 12, pp. 065038(2010)

[2] D. Hunger, C. Deutsch, R. J. Barbour, R. J. Warburton and J. Reichel, AIP Advances 2, 012119 (2012)

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DPG-Physik > DPG-Verhandlungen > 2014 > Berlin