Coaxial multi-layer hybrid plasmonic waveguide at subwavelength scale Jinping Tian, Miao Sun, Rongcao Yang and Lijun Song Eur. Phys. J. D, 68 10 (2014) 285 Published online: 02 October 2014 DOI: 10.1140/epjd/e2014-50237-9