High-speed and broadband terahertz wave modulators based on large-area graphene field-effect transistors Mao, Qi ; Wen, Qi-Ye ; Tian, Wei ; Wen, Tian-Long ; Chen, Zhi ; Yang, Qing-Hui ; Zhang, Huai-Wu Abstract Publication: Optics Letters Pub Date: October 2014 DOI: 10.1364/OL.39.005649 Bibcode: 2014OptL...39.5649M