Optical constants of Al2O3 (Aluminium sesquioxide, Sapphire, Alumina)
Rodríguez de Marcos et al. 2025: n,k 3.1e-6–993 µm
Complex refractive index (n+ik)
Derived optical constants
Conditions
deposition_temperature: 573
Comments
The aluminum oxide films were deposited by plasma-enhanced atomic layer deposition (PEALD) onto Si and MgF2 substrates heated at 300 °C. Optical measurements (transmittance, reflectance, and ellipsometry) were performed over a very broad spectral range jointly covering from 58.4 nm to 43 μm. Using these measurements, along with suitable extrapolations, a Kramers-Kronig analysis procedure was applied to obtain a self-consistent set of optical properties that successfully reproduces the experimental data. Global and local self-consistency of the derived properties were satisfactorily evaluated through the application of sum rules.
References
L. V. Rodriguez de Marcos, M. Christophersen, M. F. Batkis, J. G. del Hoyo, J. Patel, E. J. Wollack, J. A. Christodoulides, J. I. Larruquert, M. A. Quijada. Self-consistent optical properties of PEALD-Al2O3 thin films. Opt. Express 7, 1750-1764 (2016) (Numerical data kindly provided by Luis Rodriguez de Marcos)
Data
Additional information
About Aluminium sesquioxide
Al2O3, commonly known as alumina or aluminum oxide, is a ceramic material that has a wide range of applications due to its excellent mechanical and optical properties. This compound crystallizes in various phases, the most stable and common of which is the corundum structure. Alumina is transparent in the ultraviolet to the infrared range, making it a versatile material for a variety of optical applications such as protective windows and lenses. It has a high refractive index and is also known for its strong dielectric properties. One of the key attributes of Al2O3 is its remarkable thermal stability and resistance to chemical attack, which makes it suitable for harsh environment applications. Furthermore, the material has been investigated for its nonlinear optical characteristics, although it is generally less efficient in this regard compared to other nonlinear optical materials. Alumina can also serve as a substrate material for thin-film optical coatings. In summary, Al2O3 is a robust and multifunctional material that is extensively studied for its enduring relevance in both traditional and advanced optical systems. Mineral: Corundum Gemstones: Sapphire, Ruby
Other names and variations:- Al2O3
- Alumina
- Aluminium oxide
- Aloxite
- Aluminium oxide (α)
- Aluminium(III) oxide
- Dialuminium trioxide
- Corundum
- Sapphire
- Ruby