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Optical Engineering

Optical performance of amorphous hydrogenated carbon layers: range of optical constants achievable
Author(s): Olaf Stenzel; Ralf Petrich
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Paper Abstract

The optical properties of differently deposited amorphous carbon layers have been investigated by spectrophotometric means from the middle infrared up to the visible spectral region. The optical constants of the layers could be calculated by a numerical procedure that combines features of single-wavelength methods and multiwavelength methods. Depending on the deposition technique applied, the optical constants of the layers have been found to vary over a wide range. Thus, refractive index values could be established between 1.6 and 2.9, while IR-absorption coefficients vary between 20/cm and 40,000/cm. The optical performance of the layers is thus nonuniform and may be influenced by the selection of suitable deposition parameters. Due to the potentially wide range of optical constants of amorphous carbon, various possibilities exist for the application as an optical thin film material. Applications such as selective absorber coatings for solar physical purposes are discussed as well as mechanically and chemically resistant antireflection coatings on high-refractive index semiconducting materials (silicon, germanium).

Paper Details

Date Published: 1 November 1993
PDF: 9 pages
Opt. Eng. 32(11) doi: 10.1117/12.147696
Published in: Optical Engineering Volume 32, Issue 11
Show Author Affiliations
Olaf Stenzel, Chemnitz Univ. of Technology (Germany)
Ralf Petrich, Chemnitz Univ. of Technology (Germany)

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