Optical techniques are usually the preferred method for measuring thin films because they are accurate, non-destructive, and require little or no sample preparation.

Optical techniques can determine the thickness, roughness and optical constants of a film. Spectrophotometry is an optical technique where the reflectivity is measured over a wide range of different wavelengths. Reflection occurs whenever light passes through an interface between different materials and the amount of light that is reflected depends on the different in the optical properties (n and k) at the interface.

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Optical profilers like ProFilm3D are interference microscopes and are used to measure height variations – such as surface roughness – on surfaces with great precision using the wavelength of light.


Surface measurement, synonymous with surface metrology is able to determine surface topography, which is essential for confirming a surface’s suitability for its function.


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