Pseudospark excited sub-THz frequency sources H. Yin, L. Zhang, Y. Yin, J. Zhao, G. Shu, W. He, A. W. Cross and A. D. R. Phelps EPJ Web Conf., 149 (2017) 05015 Published online: 04 August 2017 DOI: 10.1051/epjconf/201714905015