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Berlin 2008 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 31: Poster II

HL 31.51: Poster

Tuesday, February 26, 2008, 16:30–19:00, Poster D

Coupling of quantum-dot excitons with nanoantennas — •Markus Pfeiffer1,2, Thomas Zentgraf1,2, Markus Lippitz1,2, and Harald Giessen114. Physikalisches Institut, Universität Stuttgart — 2Max Planck Institut für Festkörperforschung, Stuttgart

Our goal is to increase the coupling efficiency of single quantum systems to light with optical nanoantennas. As particle plasmon polaritons in metal nanostructures show a strong coupling to the light field, they seem to be promising candidates for this. We try to engineer the emission properties of quantum objects, such as excitons in semiconductor quantum dots, by utilizing the local field enhancement of metal nanostructures. For the experimental investigation of the emission rate, we use a streak camera which provides spectral and temporal resolution of the photoluminescence of the quantum dots. From such measurements the ensemble luminescence lifetime can be determined with an (multi)exponential fit of the spectrally integrated intensity profile. The goal is to increase the radiative decay rate of the excitons in the quantum dots by designing the local field enhancement of metal nanostructures. For different quantum dot systems, the dependence of the coupling process on the thickness of the capping layer between quantum dots and metal structures is studied. We will demonstrate limitations of these ensemble measurements and show first steps towards characterization of well defined single quantum dot–nanoantenna pairs.

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