Refractive index database

nk database   |   n2 database   |   about




Optical constants of Ta2O5 (Tantalum pentoxide)
Rodríguez-de Marcos et al. 2016: n,k 0.03–1.5 µm

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants

Conditions & Spec sheet

n_is_absolute: true
wavelength_is_vacuum: true
deposition_temperature: 300 °C


Oxide films were deposited by reactive electron-beam evaporation onto various sorts of substrates at 300 °C


L. V. Rodríguez-de Marcos, J. I. Larruquert, J. A. Méndez, J. A. Aznárez. Self-consistent optical constants of SiO2 and Ta2O5 films, Opt. Mater. Express 6, 3622-3637 (2016) (Numerical data kindly provided by Juan Larruquert)


[CSV - comma separated]   [TXT - tab separated]   [Full database record]


Tantalum pentoxide, Ta2O5

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

  • Tantalum oxide
  • Tantalum pentaoxide
  • Ditantalum pentoxide
  • Ditantalum pentaoxide

External links