On the morning of my professional career, as research and development engineer, I had the chance to work at the Institute of Micro Electronic Center (IMEC). This book presents the work I have done from February till September 2007 and its focuses on the investigation of mechanical properties of low-k materials using opto-acoustic technique. Before approaching the opto-acoustic method itself, I practiced the techniques of thin films deposition, plasma treatment and spectro-ellipsometric characterization of materials. Unlike spectro-ellipsometric thin films study, the opto-acoustic...