Refractive index database

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Optical constants of TiO2 (Titanium dioxide)
Siefke et al. 2016: Thin film; n,k 0.120–125 µm

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants


Film: prepared by ALD, 350 nm TiO2. See Ratzsch et al. Nanotechnology 26, 024003 (2015).
Measurement: ellipsometer Jobin Yvon UVISEL2 VUV: 1.5-8.7 eV; ellipsometer Jobin Yvon UVISEL: 0.6-6.5 eV; ellipsometer Woollam IRVASE: 300-6500 cm-1; spectrophotometer McPhersom VUVas 2000: 5.6-10.3 eV; spectrophotometer Perkin Elmer Lambda 1050: 0.5-6.7 eV; spectrophotometer Bruker Vertex 80v: 80-7500 cm-1.
Fit model: universal dispersion model. See Franta et al. Appl. Opt. 54, 9108-9119 (2015).


T. Siefke, S. Kroker, K. Pfeiffer, O. Puffky, K. Dietrich, D. Franta, I. Ohlídal, A. Szeghalmi, E.-B. Kley, A. Tünnermann. Materials pushing the application limits of wire grid polarizers further into the deep ultraviolet spectral range, Adv. Opt. Mater. 4, 1780–1786 (2016) (Numerical data kindly provided by Thomas Siefke)


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Titanium dioxide, TiO2

Titanium dioxide (TiO2) is a naturally occurring oxide of titanium. It possesses a high refractive index, making it an important material in optical coatings and components, especially as a white pigment in paints, cosmetics, and sunscreens due to its UV absorbing properties. The two main crystal forms used in industry are the rutile and anatase forms. Additionally, its photovoltaic and photocatalytic properties have led to research and applications in solar cells and air purification, respectively. TiO2 also has a robust chemical stability under various conditions, which makes it a preferred material for use in harsh environments.

Other names

  • Titanium(IV) oxide
  • Titania


  • Rutile
  • Anatase
  • Brookite

External links