Abstract
Electro-optic effects of PbZr0.52Ti0.48O3 (PZT) and BaTiO3 (BTO) ferroelectric thin films in the terahertz frequency range are studied with high-sensitive terahertz time-domain spectroscopy. A linear response of PZT film with the linear electro-optic coefficient rc = 6.73 × 10−l1 m/V and a quadratic response of BTO film with the second-order electro-optic coefficient Rc = 1.42 × 10−l7 m2/V2 are observed at the frequency of 1 terahertz under the applied static electric field less than 80 kV/cm. The calculation of rc and Rc based on the Landau-Devonshire free energy theory explains the different electro-optic effects of PZT and BTO well.
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