Theoretical models of SERS

Theoretical models of Surface-Enhanced Raman Scattering (SERS) explain how certain surfaces amplify the detection of molecules. They suggest that when light hits a metallic surface (like gold or silver), it excites collective electron movements called surface plasmons. These create intense localized electromagnetic fields, especially in tiny gaps or rough areas. When molecules are near these spots, their vibrations produce stronger signals, greatly increasing the Raman scattering. These models help us understand the physical mechanisms behind SERS, guiding the design of better sensors for detecting small amounts of chemicals or biological molecules.