Interaction between Nanoprisms with Different Coupling Strength

The aggregated noble metal system, consisting of two or more nanoparticles, possesses unique optical properties. The most important is the ability to generate larger local electric field enhancement than a single particle. In this work, we have modeled the system composed of silver nanoprisms with different geometries. For this purpose, the optical properties of the single silver nanoprism and the aggregated nanoprism dimer with adjacent and coplanar bases configuration have been studied by the finite integration technique. The relationship between the geometrical parameters, in particular the radius of the edges of curvature of a single nanoprism, and the position of the extinction peak has been described in a form of a mathematical equation. By moving and rotating one of the nanoprisms relative to the other in the dimer system, the coupling strength between them has been investigated by analyzing the near-field and far-field properties. On the basis of these results, a hybridization model of the nanoprism dimer has been proposed. Our theoretical considerations presented in this article can be a useful tool for predicting the optical properties of the organized metal nanoparticles and the optimization of the assembly process.