Optical constants of BaTiO3 (Barium titanate)
Kang et al. 2026: n,k(o) 0.193–39.3 µm
Complex refractive index (n+ik)
Derived optical constants
Conditions
optical_component: o temperature: 293
Comments
Single-domain bulk BaTiO3 single crystal (tetragonal P4mm, uniaxial at room temperature). Ordinary ray (o), E ⊥ c. Intrinsic optical constants obtained from a simultaneous analysis of spectroscopic ellipsometry and transmission measurements on a-cut and c-cut samples. k = 0 denotes absorption below the detection limit.
References
J. Kang, N. Hong, C. M. Yi, Y. S. Go, M. Thomaschewski, H. J. Woo, P. Thureja, J. Jahng, H. A. Atwater, M. S. Jang. Broadband optical characterization of tetragonal barium titanate by Mueller-matrix spectroscopic ellipsometry. ACS Photonics 13, XXX (2026) (Numerical data kindly provided by Jiwon Kang)
Data
Additional information
About Barium titanate
BaTiO3, or barium titanate, is a ferroelectric crystal with a perovskite structure that is highly prized for its dielectric and piezoelectric properties. In the realm of optics, this material is particularly important for its electro-optic and nonlinear optical capabilities. It exhibits a high refractive index, and its electro-optic coefficients are among the highest of the known crystals, making it well-suited for applications such as optical modulators and beam deflectors. In addition to its electro-optic uses, BaTiO3 is employed in the fabrication of photonic devices like waveguides and resonators. Its ferroelectric nature also enables applications in data storage and other memory devices. BaTiO3 can be grown using various techniques such as the Bridgman or Czochralski methods and can be doped with different elements to fine-tune its properties. While it is a robust and versatile material, it is sensitive to defects and impurities, which can impact its optical performance. Overall, BaTiO3 is a multifunctional material with a wide range of applications in both the electronic and optical domains, making it a subject of continued research and technological development.
Other names and variations
- BaTiO3
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