Contribution of two-photon and excited state absorption in axial-bonding type hybrid porphyrin arrays under resonant electronic excitation
نویسندگان
چکیده
Two-photon absorption (2PA) and excited state absorption (ESA) properties of axial-bonding type hybrid porphyrin arrays are investigated in the picosecond regime under single-photon resonant excitation condition. A crossover from reverse saturable absorption (RSA) to saturable absorption (SA) and back to RSA is observed with the increase of excitation intensity. In the corresponding intensity ranges, thirdand fifth-order phase conjugate signals from degenerate four wave mixing are observed. These observations are explained using rate equations for population densities in a three-level energy scheme. At higher intensities, 2PA is found to be dominant contributor to nonlinear absorption compared to ESA. 2005 Elsevier B.V. All rights reserved.
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