THz radiation from an ultrashort-laser-induced fast spark dense plasmaN. Yugami, F. Suzuki, H. Kashiwazaki, T. Higashiguchi, Y. Sentoku, A. Nishida and R. KodamaEPJ Web of Conferences, 59 (2013) 18007DOI: https://doi.org/10.1051/epjconf/20135918007