Abstract
In this paper, Nano-Plasmonic Optical Resonator design of Fabry-Perot type is proposed. It is an array of metal nanorods separated from a metal film by a dielectric layer. Some plasmonic optical resonators are briefly reviewed. Modeling and simulation of the spectral properties of the electric field in the resonator are presented. Tuning the resonance wavelengths at various resonator parameters of dimensions and materials is studied. The highest electric field enhancement is obtained for silver (similar to 370). The field enhancement in Aluminum is almost one third that of Noble metals. Comparison of the field enhancement (between Al versus Be, Cr, Ni, Pd, Pt, Ti, and W) as non-plasmonic metals is investigated. Among all considered metals, Aluminum has the largest spectral width spans NIR, visible, and UV regimes. Nearly complete absorption is obtained at certain resonance wavelengths. The numerical calculations are carried out using the finite difference time domain (FDTD) method. The proposed design is simple to be manufactured and quite efficient for many applications in nanophotonics, surface sensing, and plasmonic solar cells.