TY - JOUR
T1 - Two-photon absorption cross section determination for fluorene derivatives
T2 - Analysis of the methodology and elucidation of the origin of the absorption processes
AU - Belfield, Kevin D.
AU - Bondar, Mykhailo V.
AU - Hernandez, Florencio E.
AU - Przhonska, Olga V.
AU - Yao, Sheng
PY - 2007/11/8
Y1 - 2007/11/8
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=36248952640&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=36248952640&partnerID=8YFLogxK
U2 - 10.1021/jp074456f
DO - 10.1021/jp074456f
M3 - Article
C2 - 17939706
AN - SCOPUS:36248952640
SN - 1520-6106
VL - 111
SP - 12723
EP - 12729
JO - Journal of Physical Chemistry B
JF - Journal of Physical Chemistry B
IS - 44
ER -