The physics models of plasmonics for single nanoparticle, complex single nanoparticle, nanodimer, and single nanoparticle over a metallic thin film with an isolation layer, have been reviewed in this article. In nanoscale, the localized plasmonics from the single nanoparticle, hybrid single nanoparticle, and nanodimer, can be illustrated by classical electrodynamics. When the space of a nanodimer downs to subnanometer, the classical electrodynamics would fail to predict the resonance spectrum or dispersion of the nanostructures. The quantum model and quantum-corrected electrodynamics model, are introduced to deal with this problem. For the single nanoparticle over a metallic thin film with an isolation layer, the plasmonic resonance and the enhanced local field depend on the thickness of the isolation layer strongly. When the isolation layer thickness goes down to subnanometer, the classical electromagnetics model would be replaced by the quantum model for illustrating of the plasmonics. The physics models of plasmonics have wide applications in design and fabrication of the metallic nanostructure for further research.
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