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Direct Observation of Highly Polarized Non-Linear Absorption Dipole of Single Semiconductor Quantum Rods

Published online by Cambridge University Press:  21 March 2011

Eli Rothenberg ,
Yuval Ebenstein ,
Miri Kazes  and
Uri Banin
Eli Rothenberg
Affiliation:
Institute of Chemistry, the Farkas Center for Light Induced Processes and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
Yuval Ebenstein
Affiliation:
Institute of Chemistry, the Farkas Center for Light Induced Processes and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
Miri Kazes
Affiliation:
Institute of Chemistry, the Farkas Center for Light Induced Processes and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
Uri Banin
Affiliation:
Institute of Chemistry, the Farkas Center for Light Induced Processes and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
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Abstract

Polarization fluorescence microscopy was used to study the nature of the emission and nonlinear absorption dipole of single CdSe/ZnS quantum rods. Rods, with aspect ratios ranging from 2.75 to 15, showed strongly polarized emission consistent with previous one-photon studies. Non- linear excitation showed a sharp angular dependence fully consistent with the predicted two- photon absorption process. Two-photon absorption probes different transitions than linear absorption due to modified parity and angular momentum selection rules. The two-photon absorption dipole was found to be parallel to the emission polarization, and allows achieving highly orientation selective excitation of quantum rods. This is yet a further demonstration of single molecule measurements in unraveling basic principles of light-matter interaction that are otherwise masked by ensemble averaging.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 818: Symposium M – Nanoparticles and Nanowire Building Blocks-Synthesis, Processing, Characterization and Theory , 2004 , M6.5.1
Copyright
Copyright © Materials Research Society 2004

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