Zero extinction and topological edge modes in PT-symmetric plasmonic chains

By considering an array of plasmonic nanoparticles coated alternatively by gainloss balanced dielectrics, we demonstrate that a PT-symmetric chain can support topological edge modes with quantized Zak phases if the bulk modes for all real Bloch's wavevectors are in the PT symmetric unbroken phase. We show that the coupled dipole equation of the system can… CONTINUE READING