Hannover 2013 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 43: Poster II
Q 43.57: Poster
Wednesday, March 20, 2013, 16:00–18:30, Empore Lichthof
A Cavity Nanoscope — •Matthias Mader1,2, Hanno Kaupp1,2, Thomas Hümmer1,2, Jakob Reichel3, Theodor W. Hänsch1,2, and David Hunger1,2 — 1Ludwig-Maximilians-Universität München, Schellingstraße 4, 80799 München — 2Max-Planck-Institut 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 extremely 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 an high finesse scanning optical microcavity. It is based on a laser machined and mirror-coated end facet of a single mode fiber and a macroscopic plane mirror forming a fully tunable open access Fabry-Perot cavity [1]. Scanning the sample placed on the plane mirror through the microscopic cavity mode yields a spatially resolved map of absorptivity of the sample.
We show first proof-of-principle experiments with single gold nanospheres. We demonstrate polarization sensitive absorption measurements as well as measurements on dispersive and birefringent effects of the samples.
[1] D. Hunger, T. Steinmetz, Y. Colombe, C.Deutsch, T. W. Hänsch and J. Reichel A fiber Fabry-Perot Cavity with high finesse, New J. Phys. 12, pp. 065038(2010)