This article discusses the use of the Cary Absolute Specular Reflectance accessory for measuring the optical constants of thin films. By measuring the transmittance and reflectance, the dispersion and extinction coefficient of the films can be obtained, and various useful quantities such as the dielectric function and absorption coefficient can be calculated.
The document presents a preliminary evaluation of the new Cary absolute specular reflectance accessory (SRA) designed for use with the Cary 2400 spectrophotometer. It details how the accessory measures transmittance and reflectance to determine the dispersion and extinction coefficient of thin absorbing films.
It is used for the measurement of optical constants of thin films.
The instrument measures wavelengths between 200 nm and 3000 nm.
The measured reflectance varied by less than 1.5% for displacements of the slide of up to 1 mm.