Abstract
Heteroepitaxial Na0.5K0.5NbO3(1.5μm)/La0.5Sr0.5CoO3(0.5μm) (NKN/LSCO) films were grown on an Al2O3(011̱2) single crystal (r-cut sapphire) by rf-magnetron sputtering (NKN) and pulsed laser deposition (LSCO) techniques. Prism coupling waveguide refractometry has been employed to characterize vertical capacitive electro-optical cells with 2×8mm2 semitransparent Au top electrodes. Fitting reflectivity spectra to Fresnel formulas yields extraordinary and ordinary refractive indices ne=2.232 and no=2.234 as well as electro-optic coefficient r13=17.4pm∕V. Dispersion of the refraction index follows the Sellmeier formula n2=1+3.46∕[1−(244nm∕λ)2] in the range from 400 nm to 850 nm.
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