Fluence-induced reversal of saturable absorption in a ruthenium-based porphyrin

Experimental nonlinear absorption data obtained using the open-aperture Z-scan technique are presented for 2, 3, 7, 8, 12, 17, 18-octaethyl-21H, 23H-porphine ruthenium (II) carbonyl in tetrahydrofuran. These data show saturation of nonlinear absorption dominating at low fluence but being overcome by...

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Bibliographic Details
Published in:Applied optics (2004) 2017-01, Vol.56 (3), p.B14-B17
Main Authors: Pritchett, Timothy M, Hoffman, Robert C, Mott, Andrew G, Ferry, Michael J
Format: Article
Language:English
Subjects:
Absorption
Absorption cross sections
Fluence
Mathematical analysis
Mathematical models
Nonlinearity
Ruthenium
Scattering
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Summary:Experimental nonlinear absorption data obtained using the open-aperture Z-scan technique are presented for 2, 3, 7, 8, 12, 17, 18-octaethyl-21H, 23H-porphine ruthenium (II) carbonyl in tetrahydrofuran. These data show saturation of nonlinear absorption dominating at low fluence but being overcome by induced absorption (reverse saturable absorption) at high fluence. Large-angle scattering measurements demonstrate that the induced absorption is real and not merely the result of scattering of light outside of the collection aperture of the detector by scattering centers induced at high fluence. A possible mechanism based on a four-band effective rate equation model is proposed. The model is used to accurately predict the results of Z scans taken at different pulse energies and to extract values for excited-state lifetimes and absorption cross sections from the experimental data.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.56.000B14