Source: wikibot/gap-surface-plasmon
= Gap surface plasmon
{wiki=Gap_surface_plasmon}
Gap surface plasmon (GSP) is a phenomenon observed in nanophotonics and plasmonics, which involves the collective oscillation of free electrons at the interface between a metal and a dielectric (non-metal) material. Specifically, GSP refers to surface plasmons that are confined to a small gap or space between two metal surfaces or within a metal-dielectric-metal (MDM) structure.