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Cavity-enhanced Raman microscopy of individual carbon nanotubes

Hümmer, T.; Noe, J.; Hofmann, M. S.; Hänsch, T. W.; Högele, A.; Hunger, D.

Abstract (englisch):
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.

Zugehörige Institution(en) am KIT Physikalisches Institut (PHI)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator DOI: 10.1038/ncomms12155
ISSN: 2041-1723
URN: urn:nbn:de:swb:90-648739
KITopen ID: 1000064873
Erschienen in Nature Communications
Band 7
Seiten 12155
Schlagworte Carbon nanotubes and fullerenes; Optical physics; Raman spectroscopy
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