Abstract
By changing or fine-tuning the surface structure of the metal, the characteristics of surface plasmon – especially the interaction with light – can be customized. In this work, we numerically design a plasmonic nanostructure composed of a pair of symmetrical bifurcation nanostructures. An underlying optical property of the observed scattering and absorption cross section spectra and physical mechanism is illustrated by analyzing spatial distributions of the magnetic field, electric field, and surface current component at resonant wavelengths. Moreover, the extremely intense and highly confined electromagnetic fields induced in the bifurcation plasmonic nanostructure provide a sensitive environment to probe minor changes in the dielectric environment. Such high-performance composite nanostructure provides great potential for the application of sensing.
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