Direct observation of highly polarized non-linear absorption dipole of single semiconductor quantum rods

Eli Rothenberg*, Yuval Ebenstein, Miri Kazes, Uri Banin

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

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. Nonlinear 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.

Original languageAmerican English
Pages (from-to)171-176
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume818
DOIs
StatePublished - 2004
EventNanoparticles and Nanowire Building Blocks - Synthesis, Processing, Characterization and Theory - San Francisco, CA, United States
Duration: 13 Apr 200416 Apr 2004

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