Berlin 2005 – wissenschaftliches Programm

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Q: Quantenoptik und Photonik

Q 36: Quanteneffekte II

Q 36.6: Vortrag

Dienstag, 8. März 2005, 12:00–12:15, HU 1072

Modification of spontaneous emission and energy transfer by high-Q modes of a microsphere resonator — •Andrea Mazzei¹, Leonardo Menezes¹, Stephan Götzinger¹, Vahid Sandoghdar², and Oliver Benson¹ — ¹Humboldt Universität zu Berlin, Institut für Physik - AG Nanooptik, Hausvogteiplatz 5-7 10247 Berlin — ²Laboratory of Physical Chemistry, Swiss Federal Institue of Technology, Ch-8093, Zürich, Switzerland

Coupling single quantum emitters to the modes of a high-Q microsphere, the so-called Whispering Gallery Modes (WGM), is a research topic of great interest, e.g. for Cavity-QED experiments and for the realization a nanolaser. To perform such experiments, a detailed knowledge of the structure of the modes and of the coupling efficiency of active material to the modes is crucial [1, 2]. Using techniques developed in near-field optical microscopy we could measure the so called beta-factor (defined as the ratio of the emission into a certain mode and the total spontaneous emission) of the emission of a single nano-emitter (realized by a 200nm dye-doped bead) into the fundamental WGM. In the same experimental configuration we also studied cavity mediated energy transfer between single nano-emitters as well as induced coupling between the clockwise and counter-clockwise propagating modes.

[1] S. Götzinger, O. Benson, V. Sandoghdar, App. Phys. B 73, 825 (2001)

[2] S. Götzinger et al., Proc SPIE 4969, 207 (2003)