• DOI:10.1021/ACSPHOTONICS.0C00991
• Corpus ID: 219176890

Video-Speed Graphene Modulator Arrays for Terahertz Imaging Applications

@article{Malevich2020VideoSpeedGM,
  title={Video-Speed Graphene Modulator Arrays for Terahertz Imaging Applications},
  author={Y. V. Malevich and M. Said Ergoktas and Gokhan Bakan and Pietro Steiner and Coskun Kocabas},
  journal={arXiv: Applied Physics},
  year={2020}
}

• Y. Malevich, M. S. Ergoktas, +2 authors C. Kocabas
• Published 1 June 2020
• Physics
• arXiv: Applied Physics

Electrically tuneable high mobility charges on graphene yield an efficient electro-optical platform to control and manipulate terahertz (THz) waves. Real-world applications require a multiplex THz device with efficient modulation over a large active area. The trade-off between the efficient gating and switching speed, however, hinders the realization of these applications. Here, we demonstrate a large-format 256-pixel THz modulator which provides high-frame-rate reconfigurable transmission patterns. The time-domain and frequency-domain THz characterizations of graphene devices reveal the relaxation pathways of gate-induced charges and ion packing at graphene-electrolyte interface. The fundamental understanding of these limiting factors enables us to break the trade-off permitting switching frequencies up to 1 kHz. To show the promises of these devices, we demonstrate a single-pixel THz camera which allows spatial and spectroscopic imaging of large-area objects without any moving components. These results provide a significant advancement towards the achievement of non-invasive THz imaging systems using graphene-based platforms.