Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 62: Poster: Quantum Optics and Photonics III
Q 62.51: Poster
Donnerstag, 26. März 2015, 17:00–19:00, C/Foyer
Cavity-enhanced Scanning Raman-Spectroscopy of single Carbon Nanotubes — •Thomas Hümmer1,2, Matthias S. Hofmann1, Jonathan Noe1, Alexander Högele1, Theodor W. Hänsch1,2, and David Hunger1,2 — 1Ludwig-Maximilians-Universität München, Deutschland — 2Max-Planck Institut für Quantenoptik, Garching, Deutschland
We use fully tunable fiber-based optical microcavities [1] with small mode volumes and high quality factors to study carbon nanotubes.
We detect Raman scattering of individual CNTs strongly enhanced by the Purcell effect. Since the spectral emission is increased on the order of the cavity Finesse, which can be as large as 105, this enables us to measure Raman spectra with high sensitivity and spectral resolution.
Harnessing the full tunability and open access of these micro-cavities allows us to perform scanning measurements, addressing a variety of nanotubes individually at different locations and wavelengths.
We compare the cavity enhanced detection to diffraction limited confocal measurements carried out on exactly the same CNTs. This yields a more than an order of magnitude enhanced collection efficiency, in agreement with theoretical predictions. Straightforward improvements are expected to lead to significantly larger signals.
Hunger, Reichel et al., NJP 12, 065038 (2010)