Saturable absorption and absorption recovery of indocyanine green J-aggregates in water

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Concentrated aqueous indocyanine green solutions form J-aggregates (absorption peak at 890 nm). Nonlinear energy transmission measurements using femtosecond pulses of a cw mode-locked Ti:sapphire laser were performed to determine the number density, the ground-state absorption cross section, and the excited-state absorption cross section of the J-aggregate chromophores (Frenkel excitons). The chromophore number density was found to be approximately one sixteenth of the molecule density (coherent exciton extension over approximately sixteen molecules). In a Michelson-type transmission correlation measurement a ground-state absorption recovery time of (4.5 +/- 1) ps was deduced. The absorption and emission dynamics including results from previous fluorescence quantum yield measurements are discussed
Publisher
SPRINGER
Issue Date
1998-04
Language
English
Article Type
Article
Keywords

OPTICAL-DYNAMICS; PSEUDOISOCYANINE; SPECTROSCOPY; EXCITONS; PICOSECOND; LINESHAPES; MONOMERS; SPECTRA

Citation

APPLIED PHYSICS B-LASERS AND OPTICS, v.66, no.4, pp.453 - 459

ISSN
0946-2171
DOI
10.1007/s003400050418
URI
http://hdl.handle.net/10203/212806
Appears in Collection
PH-Journal Papers(저널논문)
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