Wittmann, T. and Rotermund, F. and Weigand, R. and Penzkofer, Alfons (1998) Saturable absorption and absorption recovery of indocyanine green J-aggregates in water. APPLIED PHYSICS B-LASERS AND OPTICS, 66 (4). pp. 453-459. ISSN 0946-2171, 1432-0649
Full text not available from this repository.Abstract
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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | OPTICAL-DYNAMICS; PSEUDOISOCYANINE; SPECTROSCOPY; EXCITONS; PICOSECOND; LINESHAPES; MONOMERS; SPECTRA |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Alumni or Retired Professors > Group Alfons Penzkofer |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 24 Feb 2023 11:08 |
| Last Modified: | 24 Feb 2023 11:08 |
| URI: | https://pred.uni-regensburg.de/id/eprint/49949 |
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