Ultrafast Terahertz Self-Induced Absorption and Phase Modulation on a Graphene-Based Thin Film Absorber - Koulouklidis, Anastasios D.; Tasolamprou, Anna C.; Doukas, Spyros; Kyriakou, Eudokia; Ergoktas, M. Said; Daskalaki, Christina; Economou, Eleftherios N.; Kocabas, Coskun; Lidorikis, Elefterios; Kafesaki, Maria; Tzortzakis, Stelios (ACS Photonics, 2022)