Abstract
LiTaO3(LT)/LiNbO3(LN) super-lattice thin films with different LT/LN ratios are fabricated on (0001) sapphire (α-Al2O3) substrates using the pulsed laser deposition method. Well-defined X-ray super-lattice reflections are observed, and the SL period are calculated from these super-lattice positions, which coincide well with design ones estimated from the deposition velocities of LN and LT. X-ray θ–2θ and in-plane φ-scans confirm the epitaxial growth of the films. Photon energy dependence of complex refractive indices n* of these super-lattice thin films are measured by a spectroscopic ellipsometer. The blue shift of n* with increase of LT ratio is observed.
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