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Q: Fachverband Quantenoptik und Photonik
Q 39: Nano-Optics II
Q 39.1: Talk
Wednesday, March 2, 2016, 14:30–14:45, f342
Cavity-enhanced Raman Microscopy of Individual 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 a tunable high-finesse optical microcavity[1] to demonstrate Purcell enhancement of Raman scattering in combination with high-resolution scanning-cavity imaging[2]. We detect cavity-enhanced Raman spectra[3] of individual single-walled carbon nanotubes and co-localize measurements with cavity-enhanced absorption microscopy. Direct comparison with confocal Raman microscopy yields a 1000-times enhanced collectable Raman scattering spectral density and a 20-fold enhancement of the integrated count rate for the same excitation intensity. We expand the technique to hyperspectral imaging, where we can deduce information such as the diameter and the metallic or semiconducting character of the nanotubes. The quantitative character, the inherent spectral filtering, and the absence of intrinsic background in cavity-vacuum stimulated Raman scattering renders our technique a promising tool for molecular imaging.
Hunger et al., NJP 12, 065038 (2010)
[2] Mader et al., Nat Commun 6, 7249 (2015)
[3] Hümmer et al., arXiv:1508.06810 (2015)