Hybrid plasmonic nanoprisms in the form of gold (Au)-dielectric- silver (Ag) sandwich structures have been designed and simulated using Finite-difference time-domain (FDTD) simulation technique. Simulations results show two dipole resonant peaks for the hybrid sandwich structure. Also, a strong wavelength dependence of the plasmonic resonance peaks on the edge length and the thickness of gold and silver layers. The increase in edge length and thicknesses were found red shift to the plasmonic peak of the nanostructures. Furthermore, the resonant wavelengths and relative strength of the two dipole plasmonic peaks are demonstrated to be tunable.
We studied the effect of truncation on the plasmonic resonance of triangular nanoprisms. Perfect Ag triangular prisms and Ag truncated triangular prisms have been designed and simulated using finite-difference time-domain (FDTD) simulation technique. Simulation results show that the increase of the truncations depth in triangular nanoprisms causes a resonance blue shift. However, for the case of truncation depth of up to 15 nm, the number of truncated corners has no effect on the position of the peak or the strength.