Optical constants of Ta2O5 (Tantalum pentoxide)
Franta et al. 2025: n,k 0.116–400 µm
Complex refractive index (n+ik)
Derived optical constants
Comments
Films Ta2O5; Deposited by e-beam evaporation on c-Si; Five samples with a polycrystalline structure and nominal thicknesses 20–250 nm; Multi-sample method; Heterogenous data processing combining ellipsometric and spectrophotometric measurements; Slightly inhomogeneous layers; Optical constants correspond to the characterization with homogeneous films; Room temperature.
References
D. Franta, J. Vohánka, J. Dvořák, P. Franta, I. Ohlídal, P. Klapek, J. Březina, D. Škoda. Wide spectral range optical characterization of tantalum pentoxide (Ta2O5) films by the universal dispersion model. Opt. Mater. Express 15, 903–919 (2025) (Numerical data kindly provided by Daniel Franta)
Data
Additional information
About Tantalum pentoxide
Tantalum pentoxide (Ta2O5) is a high-refractive-index, white solid material that is insoluble in water. It is known for its high dielectric constant and is widely used in the electronics industry to produce capacitors, particularly in mobile phones, DVD players, video game systems, and computers. The high dielectric constant allows for a large amount of charge to be stored, thus enabling the production of small-sized capacitors with a significant amount of capacitance. Moreover, Ta2O5 has excellent optical properties and is used as a coating material for lenses and other optical components due to its ability to increase the refractive index and provide anti-reflective coatings. It also finds applications in the development of thin films in various optical and electronic devices.
Other names and variations:- Ta2O5
- Tantalum oxide
- Tantalum pentaoxide
- Ditantalum pentoxide
- Ditantalum pentaoxide