*Hamad Ahmed1, Prokopis Hadjisolomou1, Simon Ferguson1, Stephanie Brauckmann2, Domenico Doria1, Aaron Alejo1, Thomas Hodge 1, Rajendra Prasad2, Mirela Cerchez2, Oswald Willi2, Marco Borghesi1, Satyabrata Kar1
(1. School of Mathematics and Physics, Queen's University Belfast, 2. Institut für Laser-und Plasmaphysik, Heinrich-Heine-Universität, Düsseldorf, Germany)