Surface plasmon refers to the collective oscillation of electron density at the surface of a metal, particularly in materials like gold (Au), silver (Ag), and copper (Cu). This phenomenon occurs due to the low imaginary part of the dielectric constant in these metals, resulting in pronounced and less dampened oscillations. Surface plasmons specifically propagate along the metal's surface or at the interface between two materials, distinguishing them from general plasmon modes, which involve the entire electron gas around the positive lattice.
PREREQUISITESPhysicists, materials scientists, and engineers interested in nanotechnology, photonics, and surface science will benefit from this discussion on surface plasmons.