Heidelberg 2015 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 62: Poster: Quantum Optics and Photonics III
Q 62.66: Poster
Thursday, March 26, 2015, 17:00–19:00, C/Foyer
Resonant excitation of nitrogen-vacancy centers at room temperature — •Martin Zeitlmair1, Lars Liebermeister1, Niko Heinrichs1, Florian Boehm1, Peter Fischer1, Lukas Worthmann1, Harald Weinfurter1,2, and Markus Weber1,2 — 1Ludwig-Maximilians-Universität, München — 2Max-Planck-Institut für Quantenoptik, Garching
The development of efficient single-photon sources is a crucial prerequisite for future applications in applied physical and quantum information science. Our interest lies in the evanescent coupling of a single defect center in diamond to dielectric nanostructures like the tapered region of an optical fiber. Previous studies on a single NV-center coupled to a tapered optical fiber showed a coupling efficiency of 10% [1], however with the drawback of strong unwanted fiber fluorescence caused during off-resonant excitation at 532nm. In this context, resonant excitation at the zero-phonon line at 637nm promises reduced background fluorescence.
Here, we present first room temperature experiments on the pulsed resonant excitation of a single NV-center with pulse lengths of a few nanoseconds. As excitation also populates the undesired neutral charge state, which cannot be addressed via resonant excitation, periodic off-resonant reinitialization of the negative charge state is applied. Clear antibunching characteristics in the autocorrelation measurement indicate the possible application of this resonant excitation scheme for efficient single-photon sources with low background fluorescence.
[1] Liebermeister et. al., APL 104(3) (2014): 031101