Structural and optical properties of Ca_xBa_1-xNb_2O_6 thin films deposited by radio frequency magnetron sputtering
Source abstract
Abstract
Highly (001)-oriented Calcium Barium Niobate (CaxBa1-xNb2O6, CBN) thin films were grown on MgO by Radio-Frequency magnetron sputtering. Close-to-bulk film stoichiometry (Ca0.28Ba0.72Nb2O6) is obtained for an O2 fraction of 5% in the deposition chamber. At the annealing temperature of 1000 °C, (001) oriented thin films are achieved with lattice parameter in the c-direction and a chemical composition very close to that of the bulk, and a surface roughness of 2.8 nm RMS. The refractive index of the films is 2.21 at λ = 630 nm and 2.13 at λ = 1550 nm and a strong second harmonic signal can be generated nonlinearly in the films.
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Research context
OpenAlex topics: Ferroelectric and Piezoelectric Materials · Acoustic Wave Resonator Technologies · Photorefractive and Nonlinear Optics
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