ABSTRACT
This chapter shows that the relationship between near-field enhancement, super-resolution, and modal dispersion characteristics. It explores the mechanism of field transportation and resolution on the other side of the layered material. The layers’ resonances are able to reproduce part of the evanescent spectrum to the other side of these layers, which otherwise would decay rapidly. In order to obtain a high-quality subwavelength image, one has to transport a broad range of the spatial spectrum of evanescent waves uniformly across the gap between two resonant grids. To investigate the possibility of near-field enhancement by arrays of plasmonic nanoparticles, different approaches could be used. To gain understanding into the physics of near-field enhancement, it is useful to plot and observe the dispersion curves relative to modal propagation along the array plane. The chapter suggests that three properties related to the layered arrays of nanoparticles, the near-field enhancement, the subwavelength field concentration, and the presence of modes excited by the single source.
