Slow-light dispersion by transparent waveguide plasmon polaritons

Atsushi Ishikawa,1,2 Rupert F. Oulton,1,3 Thomas Zentgraf,1,4 and Xiang Zhang1,5 1NSF Nanoscale Science and Engineering Center, University of California, 3112 Etcheverry Hall, Berkeley, California 94720, USA 2Metamaterials Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan 3Experimental Solid State Physics, The Blackett Laboratory, Imperial College London, London SW7 2BZ, United Kingdom 4Department of Physics, University of Paderborn, Warburger Straße 100, D-33098 Paderborn, Germany 5Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA (Received 31 May 2011; revised manuscript received 30 January 2012; published 5 April 2012)