THz radiation from an ultrashort-laser-induced fast spark dense plasma N. Yugami, F. Suzuki, H. Kashiwazaki, T. Higashiguchi, Y. Sentoku, A. Nishida and R. Kodama EPJ Web of Conferences, 59 (2013) 18007 Published online: 15 November 2013 DOI: 10.1051/epjconf/20135918007