Nonlinear optical response of tetra and mono substituted zinc phthalocyanine complexes

The nonlinear absorption properties of 6 mono-substituted and 3 symmetric zinc phthalocyanine complexes have been studied in dimethylsulfoxide (DMSO) using 10 ns pulses at 532 nm. The non linear absorption of the complexes has been studied using the Z-scan technique. The study showed that both the singlet and triplet excited states contribute to the non linear absorption behavior. The nonlinear third-order susceptibility and second-order hyperpolarizability values of the complexes are reported. It was observed that two of the symmetric phthalocyanine complexes (5-alpha substituted with aminophenoxy and 9-beta substituted with carboxyphenoxy) showed better and promising optical nonlinearity when compared to the other complexes studied. (C) 2015 Elsevier B.V. All rights reserved.