Two-photon fluorescence microscopy of single semiconductor quantum rods: Direct observation of highly polarized nonlinear absorption dipole

Eli Rothenberg, Yuval Ebenstein, Miri Kazes, Uri Banin

Research output: Contribution to journalLetterpeer-review

Abstract

Two-photon polarization fluorescence microscopy is used to study the nature of the emission and nonlinear absorption dipole of single CdSe/ZnS quantum rods. Rods showed strongly polarized nonlinear excitation with sharp angular dependence, following a cos4(φ) functional form, in agreement with the predicted two-photon absorption process. The two-photon absorption is parallel to the emission polarization and allows high orientation selectivity in excitation to be achieved. This further demonstrates the role of single molecule measurements in unraveling basic principles of light-matter interactions otherwise masked by ensemble averaging.

Original languageEnglish
Pages (from-to)2797-2800
Number of pages4
JournalJournal of Physical Chemistry B
Volume108
Issue number9
DOIs
StatePublished - 4 Mar 2004
Externally publishedYes

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