Observation of ultrafast THz self-actions in graphene based modulators - Koulouklidis, Anastasios D.; Kyriakou, Eudokia; Daskalaki, Christina; Ergoktas, M. Said; Tasolamprou, Anna C.; Kafesaki, Maria; Kocabas, Coskun; Tzortzakis, Stelios (Optics InfoBase Conference Papers, 2021)