Optical constants of SiO2 (Silicon dioxide, Silica, Quartz)
Herguedas and Carretero 2023: n,k 5.0–25 µm
Wavelength:
µm
(5.000–25.000)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Conditions & Spec sheet
n_is_absolute: true wavelength_is_vacuum: true
Comments
SiO1.92. Sputtered Si with 120 sccm O2 and 80 sccm Ar, which is equivalent to a oxygen partial pressure of 7.3 × 10-4 mbar and a total pressure of 1.5 × 10-3 mbar. Room temperature.
References
N. Herguedas and E. Carretero. Optical properties in mid-infrared range of silicon oxide thin films with different stoichiometries, Nanomaterials 13, 2749 (2023)
Data
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