Abstract
The nonlinear optical (NLO) properties of Tetra-tert-butyl-phthalocyanine (H2PC), Copper (II) Tetra-tert-butyl-phthalocyanine (CuPc) and Zinc (II) Tetra-tert-butyl-Phthalocyanine (ZnPC) thin films have been measured by using a single beam Z-scan technique with 250 fs laser pulse of 1064nm central wavelength at a repetition rate of 664 KHz. The choice of Phthalocyanines (Pc) amongst other organic thin films for NLO properties is essentially motivated by architectural flexibility, high thermal stability and the ease of tailoring their physical and chemical properties. The observed nonlinear absorption (NLA) in Pc thin films at 1064 nm may be explained by using a model that includes Q band transition. The results showed that NLA increases on annealing the as prepared Pc films. This could be because of aggregation of Pc molecules on annealing. We found that nonlinear refractive index is affected by the nature of the central metal atom. Nonlinear refractive index values for CuPc are negative as compared to positive values for ZnPc and H 2 Pc. We also observed nonlinear optical switching and the presence of large fifth order nonlinearity in as prepared H 2 Pc films which could be attributed to two photon absorption (TPA) generated excited state refraction (ESR).
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