Frankfurt 2006 – scientific programme

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Q: Quantenoptik und Photonik

Q 18: Photonik in komplexen und periodischen Strukturen II

Q 18.1: Talk

Monday, March 13, 2006, 17:00–17:15, H14

Modification of Spontaneous Emission of Nanoscopic Particles near Interfaces — •Gesine Steudle, Michael Barth, and Oliver Benson — Nano Optics, Institute of Physics, Humboldt University Berlin

It is well known that the spontaneous emission rate of chromophores depends on the local photonic mode structure, which can be significantly altered in the presence of interfaces. We investigate the influence of a nearby mirror on the fluorescence emission of dye-doped nanospheres using an optical tweezer to actively move the particles. Not only changes in the radiative lifetime are considered, but also changes in the angular emission characteristics. It is shown that angle-dependent measurements of the intensity as a function of the mirror-particle distance can be used to determine the quantum efficiency of the chromophore with high accuracy. Our approach can be generalized to study quantum electrodynamic effects of nanoscopic particles in more complex environments in a novel experimental configuration.