The interaction between light and electronics is central to many devices in common use; these include bar code readers (lasers), infra-red security cameras (photodetectors), solar cells, optical modulators for telecommunications signals, photodiodes, phototransistor, photomultipliers.

 Major advantages of spectroscopic ellipsometry for this application are:

• Non-destructive analysis

• Multi layer stack analysis

• NIR measurement capability

• Optical bandgap and determination of optical constants