Abstract
ABSTRACT We have deposited Na0.5K0.5NbO3 (NKN) films on single crystal Al2O3(1102) and SrTiO3(001) substrates using rf-magnetron sputtering of a stoichiometric, high-density ceramic target. Using x-ray diffraction it was confirmed that NKN grows preferentially c-axis oriented on sapphire substrate and epitaxially on the perovskite SrTiO3(001) substrate. Electro-optical (EO) properties were measured in visible light through a transverse method. With an applied dc field up to 20 kV/cm, the effective linear EO response was determined to r eff = 28 pm/V for NKN/Al2O3 and r eff = 11 pm/V for NKN/SrTiO3, where a superlinear dependence was observed.
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