Enhanced transmission of a plasmonic ellipsoid array via combining with double continuous metal films

Abstract

We propose a tunable plasmon-induced transparency metal nanostructure which can be performed by double continuous metal films with a two-dimensional hexagonal periodic array of metal ellipsoidal nanoparticles in between them. The optical features of this structure are simulated by using the three-dimensional finite-difference time-domain (3D-FDTD) method. It is discovered that the structure shows an enhanced optical transmission behavior in the optical regime, and the optical response in this structure can be efficiently modified by varying the aspect ratio of ellipsoidal nanoparticles, the thickness of metal film, and the environmental refractive index, and the period of the plasmonic array. The structure proposed here may provide a new alternative approach to obtain transparent metal structures with potential applications in optoelectronic integrated circuits, plasmonic filters and sensors.