Plasmon hybridization in stacked nanorods dimer

In this paper, we investigate the coupling effects of three dimensional Au nanorods dimer. Structural arrangement determines the electromagnetic properties of matter. Plasmon hybridization theory can explain the mode split phenomenon. A theoretical model based on a Langrangian formalism is used to interpret the evolution of the coupling effects as a function of twist angle which demonstrate that the optical properties of these Au nanorod dimers can be substantially modified by altering the twist angles between the two rods, arising from the variation of electromagnetic interactions between them. Furthermore, it shows that the dependence of the resonance frequencies and the frequency gap on the distance between two rods. We find that by increasing the twist angle or the distance between two rods, the two resonance branches tend to converge. Last, we use the 3D-finite-difference time-domain (FDTD) method to do numerical simulation, which reveals that the theoretical model can quantitatively corroborate the results from the numerical simulations.