The Localized Enhancement of Surface Plasmon Standing Waves Interacting with Single Nanoparticles

Real-time, high-sensitivity, and label-free detection to single nanoparticles has been achieved via visualizing the interaction between surface plasmon polaritons (SPPs) nanoparticles, which is widely applied chemistry biology. In this work, aiming enhance sensitivity we explore of SPP standing waves with nanoparticles. Compared SPPs, inhomogeneous fields modulate charge distributions around particle excite different electric dipole modes that tailor localized enhancements. For situating at antinodes waves, a vertical excited high-density charges are stimulated nanoparticle-film nanocavities, leading further increased enhancement. The enhancement experiences more increase smaller size, lower refractive index, dielectric constant surrounding medium, real part metal constant. Via tailoring by microscopy can be improved, would broaden its applications on nanotechnology, biomedicine, environmental monitoring.