Dispersion of magnetic plasmon polaritons in perforated trilayer metamaterials

Abstract

Multiple magnetic plasmon polariton (MPP) modes were recently explored in a well-known system-metalinsulatormetal layered structure perforated with periodic holes array [Appl. Phys. Lett. 90, 251112 (2007)]. Now, we consequently study the dispersions of the MPP modes in similar systems with rectangular hole arrays by analyzing the detailed optical transmittances at oblique incidences. Significantly, our results provide a definite polarization-dependent dispersion property of MPP modes: strong dispersive MPP (±1,±1) modes with the degeneration broken up and a remained degenerate MPP (0,±1) mode for s -polarization and almost flat dispersions of all MPP modes for p -polarization. Such a phenomenon is explained by the different coupling intensities among the artificial "magnetic atoms." This finding helps us to make a deeper understanding on the artificial magnetic excitations in this trilayer metamaterial. © 2008 American Institute of Physics.