Determination of the Optical Constants of Thin Chemical-Vapor-Deposited Diamond Windows from 0.5 to 6.5 eV
Abstract
The optical constants of thin chemical-vapor-deposited diamond windows were determined as a function of photon energy from 0.5 to 6.5 eV by fitting experimental transmittance and a reflectance data to model that includes the effects of surface optical scatter. Root-mean-squared surface roughness values were also obtained from the analysis. The windows were fabricated by microwave plasma assisted CVD on silicon substrates, followed by partial removal of the substrates by etching. The values of the refractive index were diamonds. Substantial adsorption was found to occur in the visible to near ultraviolet region (2 to 5 eV) where single-crystal diamond is transparent. The spectrum of the low-energy absorption spectrum is diamond like amorphous carbon. There is a steep increase in absorption above the indirect bandgap of diamond (5.5 eV).
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 27, 1991
- Accession Number
- ADA243094
Entities
People
- Albert R. Feldman
- Edward N. Farabaugh
- Lawrence H. Robins
Organizations
- National Institute of Standards and Technology