Refractive index database

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Optical constants of VO2 (Vanadium dioxide)
Beaini et al. 2020: n,k 0.5–25 µm; 25 °C

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
temperature: 25 °C
film_thickness: 70e-9
substrate: SiO2


70 nm-thick VO2 film deposited on SiO2 substrate. 25 °C.


R. Beaini, B. Baloukas, S. Loquai, J.E. Klemberg-Sapieha, L. Martinu. Thermochromic VO2-based smart radiator devices with ultralow refractive index cavities for increased performance, Sol. Energy Mater. Sol. Cells 205, 110260 (2020) (Data points extracted from Fig. 1)


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Vanadium dioxide, VO2

Vanadium dioxide (VO2) is a unique compound with a characteristic metal-insulator transition. At temperatures below 67°C, VO2 acts as an insulator but rapidly becomes a conductor when heated above this threshold. This swift phase transition is accompanied by a structural change from a monoclinic to a tetragonal lattice. Because of this distinctive property, VO2 has garnered significant attention for potential applications in electronics, particularly as a switch or in thermochromic devices. For example, its use in smart windows allows for the regulation of infrared radiation, enabling energy savings by blocking heat during summer or retaining it during winter. Furthermore, researchers have been exploring its potential in high-frequency electronics and optoelectronic devices.

Other names

  • Divanadium tetroxide
  • Vanadium(IV) oxide

External links