Hannover 2003 – scientific programme

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Q: Quantenoptik

Q 9: Quanteneffekte 1

Q 9.1: Talk

Monday, March 24, 2003, 14:00–14:15, F107

Coupling single nanoparticles to a high-Q microsphere resonator — •Stephan Götzinger¹, Leonardo de S. Menezes¹, Andrea Mazzei¹, Vahid Sandoghdar², and Oliver Benson¹ — ¹Humboldt-Universität zu Berlin, Institut für Physik, 10117 Berlin, Germany — ²ETH Zürich, Laboratorium für Physikalische Chemie, 8093 Zürich, Switzerland

Single nanoparticles coupled to high-Q whispering-gallery modes in silica microspheres are promising candidates for controlled cavity-QED experiments or the realization of a single quantum emitter laser. In our experiment we realized the coupling of a single 200 nm dye-doped bead to a high-Q microsphere as well as the detection of the fluorescence via a well defined and controllable output port.

We coated the microspheres with dye-doped beads or CdS/ZnS nanocrystals [1]. By using a homemade laser scanning microscope we were able to select and to address a single nanoparticle on the microsphere surface. The emission spectra observed via the prism outcoupler revealed a very pronounced modulation, agreeing well with the calculated free spectral range of the microsphere.

[1] Nanocrystals were provided by A. Rogach, Univ. Munich, N. Gaponik, D. Talapin, and H. Weller, Univ. Hamburg