Coherent magnetic plasmon modes in a contacting gold nano-sphere chain   on a gold Slab
  A coupled magnetic resonator waveguide, composed of a contacting gold nanosphere chain on a gold slab, is proposed and investigated. A broadband coherent magnetic plasmon mode can be excited in this one dimensional nanostructure. By employing the Lagrangian formalism and the Fourier transform method, the dispersion properties of the wave vector and group velocity of the magnetic plasmon mode are investigated. Small group velocity can be obtained from this system which can be applied as subwavelength slow wave waveguides. 
K. N. Chen, H. Liu, S. M. Wang, Y. J. Zheng, C. Zhu, Y. Wang and S. N.   Zhu
physics.optics