Terahertz twisted beams generation in plasma Hassan Sobhani, Mohammad Vaziri (Khamedi), Hossien Rooholamininejad and Alireza Bahrampour Eur. Phys. J. D, 70 8 (2016) 168 Published online: 30 August 2016 DOI: 10.1140/epjd/e2016-70035-7