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Nano Lett. 2016 Aug 10;16(8):4811-8. doi: 10.1021/acs.nanolett.6b00982. Epub 2016 Jul 5.

Metal-Semiconductor Nanoparticle Hybrids Formed by Self-Organization: A Platform to Address Exciton-Plasmon Coupling.

Author information

1
Institut für Physikalische Chemie, Universität Hamburg , 20148 Hamburg, Germany.
2
Institut für Theoretische Physik, Technische Universität Berlin , 10623 Berlin, Germany.
3
The Hamburg Centre for Ultrafast Imaging , 22761 Hamburg, Germany.
4
Department of Applied Physics, Stanford University , Stanford, California 94305, United States.
5
Department of Chemistry, Faculty of Science, King Abdulaziz University , Jeddah, Saudi Arabia.
6
SLAC National Accelerator Laboratory , Menlo Park, California 94025, United States.

Abstract

Hybrid nanosystems composed of excitonic and plasmonic constituents can have different properties than the sum of of the two constituents, due to the exciton-plasmon interaction. Here, we report on a flexible model system based on colloidal nanoparticles that can form hybrid combinations by self-organization. The system allows us to tune the interparticle distance and to combine nanoparticles of different sizes and thus enables a systematic investigation of the exciton-plasmon coupling by a combination of optical spectroscopy and quantum-optical theory. We experimentally observe a strong influence of the energy difference between exciton and plasmon, as well as an interplay of nanoparticle size and distance on the coupling. We develop a full quantum theory for the luminescence dynamics and discuss the experimental results in terms of the Purcell effect. As the theory describes excitation as well as coherent and incoherent emission, we also consider possible quantum optical effects. We find a good agreement of the observed and the calculated luminescence dynamics induced by the Purcell effect. This also suggests that the self-organized hybrid system can be used as platform to address quantum optical effects.

KEYWORDS:

Colloidal nanocrystals; exciton−plasmon coupling; self-organization; time-resolved photoluminescence

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