Extraordinary surface polaritons in obliquely truncated dielectric/metal metamaterials

摘要

The surface plasmonic polariton (SPP) of an obliquely truncated metal/dielectric metamaterial is investigated in a particular geometry. The dispersion relations are obtained, and we predict an extraordinary SPP mode whose propagation seriously deviates from the metamaterial surface. Extraordinary behaviors of the SPP mode are found in the vicinities of the divergence and zero points of effective permittivity. Its energy-flux density reverses in direction when the mode frequency passes the divergence point, changing from parallel to antiparallel to the in-plane wave vector. The dispersion curves terminate at the zero point for the metal filling ratio smaller than the dielectric filling ratio. The numerical results are presented based on 1D metal/SiO2 metamaterial. (C) 2016 Optical Society of America