Refractive index database

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Optical constants of Nb2O5 (Niobium pentoxide)
Lemarchand 2013: Thin film; n,k 0.25–2.5 µm

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants


500-nm monolayer deposited on BK7 substrate using the magnetron sputtering technique.


F. Lemarchand, private communications (2013). Measurement method described in:
L. Gao, F. Lemarchand, and M. Lequime. Exploitation of multiple incidences spectrometric measurements for thin film reverse engineering, Opt. Express 20, 15734-15751 (2012)


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Niobium pentoxide, Nb2O5

Niobium pentoxide (Nb2O5) is a pale yellow compound that is commonly used in the manufacture of certain optical glasses, where it imparts a high refractive index. In addition to its use in specialty glasses, Nb2O5 has garnered attention in the photonics industry due to its nonlinear optical properties, making it suitable for devices like waveguides and modulators. The material also finds application in the field of electronics as a dielectric layer in capacitors and has potential in the development of electrochromic devices. Its high dielectric constant further positions it as a candidate for thin film capacitors and transistors.

Other names

  • Niobium(V) oxide
  • Niobium pentaoxide
  • Dininiobium pentoxide
  • Diniobium pentaoxide

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