Refractive index database

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Optical constants of SiO (Silicon monoxide)
Fernandez-Perea et al. 2009: n,k 0.00155–0.177 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


Density: 2.17 g/cm3. Film deposited at room temperature.


M. Fernández-Perea, M. Vidal-Dasilva, J. I. Larruquert, J. A. Aznárez, J. A. Méndez, E. Gullikson, A. Aquila and R. Soufli. Optical constants of evaporation-deposited silicon monoxide films in the 7.1-800 eV photon energy range, J. Appl. Phys. 105, 113505 (2009) (Numerical data kindly provided by Juan Larruquert)


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Silicon monoxide, SiO

Silicon monoxide (SiO) is an inorganic compound that is a dark brown or black powder at room temperature. Unlike its stable counterpart silicon dioxide (SiO2), SiO is a highly reactive compound. SiO sublimates (converts directly from a solid to a gas) at elevated temperatures and can further oxidize to SiO2 upon exposure to air. Due to its reactivity, it is typically prepared and handled under controlled conditions. In the realm of thin-film deposition, SiO is utilized for its dielectric properties and as a component for various optical coatings. It's often evaporated in a vacuum to produce films that are used as protective or antireflection coatings in optics and electronics. The ability of SiO to act as a barrier against oxygen and moisture has also garnered interest for potential applications in encapsulating sensitive devices.

Other name

  • Silicon oxide

External links