TY - JOUR
T1 - Direct observation of highly polarized non-linear absorption dipole of single semiconductor quantum rods
AU - Rothenberg, Eli
AU - Ebenstein, Yuval
AU - Kazes, Miri
AU - Banin, Uri
PY - 2004
Y1 - 2004
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=12744271505&partnerID=8YFLogxK
U2 - 10.1557/proc-818-m6.5.1
DO - 10.1557/proc-818-m6.5.1
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AN - SCOPUS:12744271505
SN - 0272-9172
VL - 818
SP - 171
EP - 176
JO - Materials Research Society Symposium - Proceedings
JF - Materials Research Society Symposium - Proceedings
T2 - Nanoparticles and Nanowire Building Blocks - Synthesis, Processing, Characterization and Theory
Y2 - 13 April 2004 through 16 April 2004
ER -