Abstract
We present the optical and structural characterization of films of ${{\rm Ta}_2}{{\rm O}_5}$, ${{\rm Sc}_2}{{\rm O}_3}$, and ${{\rm Sc}_2}{{\rm O}_3}$ doped ${{\rm Ta}_2}{{\rm O}_5}$ with a cation ratio around 0.1 grown by reactive sputtering. The addition of ${{\rm Sc}_2}{{\rm O}_3}$ as a dopant induces the formation of tantalum suboxide due to the “oxygen getter” property of scandium. The presence of tantalum suboxide greatly affects the optical properties of the coating, resulting in higher absorption loss at $\lambda=1064\,\,{\rm nm}$. The refractive index and optical band gap of the mixed film do not correspond to those of a mixture of ${{\rm Ta}_2}{{\rm O}_5}$ and ${{\rm Sc}_2}{{\rm O}_3}$, given the profound structural modifications induced by the dopant.
© 2019 Optical Society of America
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