TY - JOUR T1 - Enhanced directed emission from metamaterial based radiation source A1 - Saenz, E. A1 - Guven, K. A1 - Ozbay, E. A1 - Ederra, I. A1 - Gonzalo, R. JA - Applied Physics Letters Y1 - 2008 VL - 92 SP - 204103-1 EP - 3 ER -