Refractive index database

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Optical constants of TiO2 (Titanium dioxide)
Zhukovsky et al. 2015: Thin film; n 0.211–1.69 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
film_thickness: 20e-9
substrate: Si


20 nm thick films on Si substrate deposited by atomic layer deposition (ALD) at 120 °C deposition temperature.


S. V. Zhukovsky, A. Andryieuski, O. Takayama, E. Shkondin, R. Malureanu, F. Jensen, A. V. Lavrinenko. Experimental demonstration of effective medium approximation breakdown in deeply subwavelength all-dielectric multilayers, Phys. Rev. Lett. 115, 177402 (2015) (Numerical data kindly provided by Osamu Takayama)


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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