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Optical constants of SiO2 (Silicon dioxide, Silica, Quartz)
Franta et al. 2016: n,k 0.0275–125 µm; 25 °C

Wavelength: µm
 (0.0275043–125.141)  
 

Complex refractive index (n+ik)[ i ]


n   k   LogX   LogY   eV

Derived optical constants

Comments

Film SiO2; Deposited by e-beam evaporation on c-Si at 25 °C; 878.4 nm thick film with a fine polycrystalline structure containing water and organic adsorbed contaminants in pores; Heterogenous data processing combining ellipsometric and spectrophotometric measurements; Room temperature.

References

D. Franta, D. Nečas, I. Ohlídal. A. Giglia, Optical characterization of SiO2 thin films using universal dispersion model over wide spectral range Proc. of SPIE 9890, 989014 (2016) (Numerical data kindly provided by Daniel Franta)

Data

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INFO

Silicon dioxide, SiO2

Silicon dioxide (SiO2), commonly known as silica, is found naturally in several crystalline forms, the most notable being quartz. Additionally, when silicon dioxide is manufactured without the crystalline structure, it forms what is known as fused silica. Fused silica is a non-crystalline (or amorphous) form of silicon dioxide and is produced by melting high purity silica at extremely high temperatures. It has superior optical clarity, especially in the ultraviolet (UV) range, and is resistant to thermal shock, making it valuable for many high-end optical applications, including lenses and windows in spacecraft and satellites. SiO2 is extensively used in electronics as an insulator and serves as a primary ingredient in the production of glass. It's also used in thin-film optics, often as antireflection coatings on optical devices. Beyond its optical applications, silicon dioxide finds use in ceramics, construction, and even as a food additive.

Other names

  • Quartz
  • Silica
  • Silicon oxide
  • Silicon(IV) dioxide

Polymorphs

  • Alpha quartz (α-quartz, most common)
  • Beta quartz (β-quartz, only stable at temperatures above 573 °C)
  • Tridymite
  • Cristobalite
  • Coesite
  • Stishovite
  • Lechatelierite
  • Chalcedony

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