Properties Of Surface Plasmons:from Classical To Quantum

Surface plasmons polaritons (SPPs) is the collective oscillation of electrons on metal surface stimulated by incident light. SPPs can propagate in structures beyond light diffraction limit and extremely enhanced the local electromagnetic field, which are useful for nano optical devices, enhanced Raman spectra and ultra-sensitively detection. Excitingly, the properties of SPPs depend strongly on the materials, sizes, shapes and dielectric environments of the metallic nanostructures, which opens the door for designing functionalized optical devices at the nanoscale. In this dissertation, we focused on the properties of SPPs and its applications, including plasmon chirality of helix arranged nanoparticles, propagation on nanowire waveguide and tip enhanced Raman scattering.Basically, this thesis can be divided into five main part. First, introduction of surface plasmonics. Second, we investigate the optical properties of linear chains of twisted nanoparticles and the multipole resonance of core-shell nanorods with big size. Theoretically and experimentally, we find that a giant optical activity can be achieved in linear chains of twisted nanoparticles by controlling the shapes, gap widths and arrangements. Third, we study the electromagnetic enhancement in the tip enhanced Raman scattering in high vacuum (HV-TERS) and find that nonlinear components of Raman can be detected due to the strong gradient field in TERS system. Additionally, we analysis the electromagnetic modes in thin silver nano wire and the optical properties along with. We find some intesting plasmon modes distribution in silver nanowire on silver film with spacer layer system. At last, by combining classical description and quantum description of optical response in metallic nanostructures, we investigate the properties of surface plasmon resonance with tunneling effect in metallic dimer.