Cavity-enhanced Raman microscopy of individual carbon nanotubes

Thomas Hümmer, Jonathan Noe, Matthias S. Hofmann, Theodor W. Hänsch, Alexander Högele () and David Hunger ()
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Thomas Hümmer: Fakultät für Physik, Ludwig-Maximilians-Universität
Jonathan Noe: Fakultät für Physik, Ludwig-Maximilians-Universität
Matthias S. Hofmann: Fakultät für Physik, Ludwig-Maximilians-Universität
Theodor W. Hänsch: Fakultät für Physik, Ludwig-Maximilians-Universität
Alexander Högele: Fakultät für Physik, Ludwig-Maximilians-Universität
David Hunger: Fakultät für Physik, Ludwig-Maximilians-Universität

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: Abstract Raman spectroscopy reveals chemically specific information and provides label-free insight into the molecular world. However, the signals are intrinsically weak and call for enhancement techniques. Here, we demonstrate Purcell enhancement of Raman scattering in a tunable high-finesse microcavity, and utilize it for molecular diagnostics by combined Raman and absorption imaging. Studying individual single-wall carbon nanotubes, we identify crucial structural parameters such as nanotube radius, electronic structure and extinction cross-section. We observe a 320-times enhanced Raman scattering spectral density and an effective Purcell factor of 6.2, together with a collection efficiency of 60%. Potential for significantly higher enhancement, quantitative signals, inherent spectral filtering and absence of intrinsic background in cavity-vacuum stimulated Raman scattering render the technique a promising tool for molecular imaging. Furthermore, cavity-enhanced Raman transitions involving localized excitons could potentially be used for gaining quantum control over nanomechanical motion and open a route for molecular cavity optomechanics.

Date: 2016
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DOI: 10.1038/ncomms12155

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