Surface Plasmon Resonance ("SPR") technology is a leading biosensor technology in molecular biology. SPR is the excitation of surface plasmons by light on planar surfaces or localized surface of nanometer-sized metallic structures. The absorption of the material onto planar metal (i.e. gold or silver) surfaces or onto the surfaces of metal nanoparticales is being measured. SPR technology has been successfully used for the analysis of proteins, nucleic acids and viruses for the past 20 years and has become as a powerful platform for life sciences, drug discovery, medicine and food safety.