Refractive index database

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Optical constants of Ta2O5 (Tantalum pentoxide)
Bright et al. 2013: Amorphous film; n,k 0.5–1000 µm

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants


Amporphous thin film


T. J. Bright, J. I. Watjen, Z. M. Zhang, C. Muratore, A. A. Voevodin, D. I. Koukis, D. B. Tanner and D. J. Arenas. Infrared optical properties of amorphous and nanocrystalline Ta2O5 thin films, J. Appl. Phys 114, 083515 (2013)
[Calculation script (Python)]


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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