Inelastic light scattering by a molecule with the quantized vibrational signature, is the physical phenomenon behind Raman spectroscopy. Raman spectroscopy has continued to find applications in a variety of fields, which include material science, biomedical and environmental monitoring, reaction monitoring and industrial processes, chemical sensing and trace detection. With the advent of modern optical systems and the discovery of surface enhancement effect, Raman spectroscopy is considered an important analytical tool with extremely high sensitivity (down to single molecule sensitivity).  SemaDyne is involved in the development of extremely sensitive chemical sensors (explosives, biological and chemical warfare agents) based on surface enhanced Raman spectroscopy (SERS). SemaDyne also actively pursues the development of non-destructive confocal Raman microscopy for monitoring the structural health of engineering structures.