Refractive index database

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Optical constants of SiO (Silicon monoxide)
Herguedas and Carretero 2023: n,k 5.0–25 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


SiO1.10. Sputtered Si with 30 sccm O2 and 170 sccm Ar, which is equivalent to a oxygen partial pressure of 2.5 × 10-4 mbar and a total pressure of 1.8 × 10-3 mbar. Room temperature.


N. Herguedas and E. Carretero. Optical properties in mid-infrared range of silicon oxide thin films with different stoichiometries, Nanomaterials 13, 2749 (2023)


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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