Monitoring of Orientation in Molecular Ensembles by Polarization Sensitive Nonlinear Microscopy

Details Monitoring of Orientation in Molecular Ensembles by Polarization Sensitive Nonlinear Microscopy Monitoring of Orientation in Molecular Ensembles by Polarization Sensitive Nonlinear Microscopy

2003-07-29

arxiv.org/abs/cond-mat/0307708v1

Physics

Condensed Matter

Soft Condensed Matter

submitted April 9th, 2003 to J. Phys. Chem. B

Scientific paper

We present high resolution two-photon excitation microscopy studies combining two-photon fluorescence (TPF) and second harmonic generation (SHG) in order to probe orientational distributions of molecular ensembles at room temperature. A detailed polarization analysis of TPF and SHG signals is used in order to unravel the parameters of the molecular orientational statistical distribution, using a technique which can be extended and generalized to a broad variety of molecular arrangements. A polymer film containing molecules active for TPF and/or SHG emission is studied as a model system. Polarized TPF is shown to provide information on specific properties pertaining to incoherent emission in molecular media, such as excitation transfer. SHG, being highly sensitive to a slight departure from centrosymmetry such as induced by an external electric field in the medium, complements TPF. The response of each signal to a variable excitation polarization allows investigation of molecular behavior in complex environments which affect their orientations and interactions.

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