Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 67: Photonics III
Q 67.5: Vortrag
Freitag, 21. März 2014, 17:30–17:45, UDL HS3038
Microcavity-enhanced Spectroscopy of Carbon Nanotubes — •T Hümmer1,2, H Kaupp1,2, M Mader1,2, J Noe2, M Hofmann2, A Högele2, TW Hänsch1,2, and D Hunger1,2 — 1Max-Planck-Institut für Quantenoptik, Garching — 2Ludwig-Maximilians-Universität, München
We use fiber-based Fabry-Perot optical microcavities [1] with mode volumes down to a few tens of wavelengths cubed and high quality factors up to 107 to study single-walled carbon nanotubes (SWCNTs). Harnessing the full tunability and open access of these cavities allows us to address a variety of nanotubes individually at different locations and wavelengths with.
We achieve high sensitivity for absorption spectroscopy, allowing to locate and characterize individual SWCNTs. Furthermore, we detect Raman scattering 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.
Recent progress in the growth of freestanding SWCNTs has demonstrated that this system can show exceptional fluorescence properties, including a strong optical dipole transition, single photon emission characteristics, and potentially Fourier limited linewidth [2]. This promises an extensive potential for cavity QED in the strong coupling regime and access to novel regimes of cavity optomechanics.
[1] Hunger et al., NJP 12, 065038 (2010) [2] Hofmann et al., Nature Nanotechnology, Vol. 8 (7) (2013)