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Effects of solvent on nonlinear absorption properties of tetraphenylporphyrin compounds in the nanosecond regime
- Source :
- Optik. 123:1015-1018
- Publication Year :
- 2012
- Publisher :
- Elsevier BV, 2012.
-
Abstract
- The nonlinear absorption properties of tetraphenylporphyrins (TPP) in different solvents and excitation intensities are investigated with nanosecond pulses by the Z-scan technique. The nonlinear absorption behaviour observed presents a distinct difference between in solvent mixtures and in pure solvents. A crossover from reverse saturable absorption (RSA) to saturable absorption (SA) and then again to RSA is observed with the increases of excitation intensity in chloroform and pyridine mixed solvents. However, porphyrin molecules in pure solvents show good RSA behaviour under the studied intensity range, no saturation absorption is observed with nanosecond excitation. Excited state absorption parameters and two-photon absorption coefficients are obtained by theoretical fit using rate equations for population densities in a seven-level energy scheme.
- Subjects :
- Materials science
Analytical chemistry
Saturable absorption
Rate equation
Nanosecond
Two-photon absorption
Atomic and Molecular Physics, and Optics
Electronic, Optical and Magnetic Materials
Solvent
chemistry.chemical_compound
chemistry
Tetraphenylporphyrin
Physics::Chemical Physics
Electrical and Electronic Engineering
Solvent effects
Absorption (electromagnetic radiation)
Subjects
Details
- ISSN :
- 00304026
- Volume :
- 123
- Database :
- OpenAIRE
- Journal :
- Optik
- Accession number :
- edsair.doi...........e195495823131192a24f983a7748804b
- Full Text :
- https://doi.org/10.1016/j.ijleo.2011.07.020