Title

Two-Photon Absorption Cross Section Determination For Fluorene Derivatives: Analysis Of The Methodology And Elucidation Of The Origin Of The Absorption Processes

Abstract

A comprehensive analysis of the well-known open aperture Z-scan method, using a modified equation for the change in transmittance, is presented and accounts for discrepancies in two-photon absorption (2PA) cross sections between picosecond and femtosecond excitation. This new approach takes into account excited-state absorption and stimulated emission of the molecules studied. The two-photon absorption cross-section spectra of a series of six fluorene-based derivatives, determined using picosecond pulses, over a broad spectral range (500-900 nm), and this approach using a modified fitting procedure in the open aperture Z-scan is reported. We demonstrate that the fluorene derivatives exhibit two-photon absorption cross-section values between 700 and 5000 GM, when excited into the two-photon allowed electronic state. Excitation anisotropy spectra, measured to investigate the nature of the observed linear and nonlinear absorption bands, are presented and provide insight into the 2PA process. © 2007 American Chemical Society.

Publication Date

11-8-2007

Publication Title

Journal of Physical Chemistry B

Volume

111

Issue

44

Number of Pages

12723-12729

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1021/jp074456f

Socpus ID

36248952640 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/36248952640

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