Abstract
The third-order nonlinear optical properties of the sol-gel derived Pb(Fe1/2Nb1/2)O3-PbTiO3 (PFN-PT) thin films have been investigated by the THG method. The (3) values of PFN-PT thin films increased from 3.2 × 10-12 esu (PT) to 8.5 × 10-12 esu (PFN) with increasing content of Fe3+ ions which possessed very high second-hyperpolarizability, γ (Fe2/3O). It was experimentally confirmed that complex oxides such as ABO3-type perovskites consisting of large non-transition metal A-site cations and small transition metal B-site cations exhibited high χ(3) as expected from Lines' model. It was also found that the χ(3) values of complex oxides could be estimated from the second-hyperpolarizabilities of the constituent single oxides reported so far. Because of the large remanent polarization, PT thin films may exhibit the highest χ(3) among the ferroelectric PFN-PT thin films studied in the present work. The maximum dielectric constant,ɛ , of 1990 at room temperature was obtained for 0.5PFN · 0.5PT thin films, whose composition corresponds to so-called morphotropic phase boundary (MPB).
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Hashimoto, T., Ishibashi, K. & Yoko, T. Third-Order Nonlinear Optical Properties and Dielectric Properties of Pb-Complex Perovskite Thin Films Prepared by Sol-Gel Method. Journal of Sol-Gel Science and Technology 9, 211–218 (1997). https://doi.org/10.1023/A:1026429600633
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DOI: https://doi.org/10.1023/A:1026429600633