Applied Physics Letters
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The efficient modulation and control of ultrafast signals on-chip is of central importance in terahertz (THz) communications and a promis- ing route toward sub-diffraction limit THz spectroscopy. Two-dimensional (2D) materials may provide a platform for these endeavors. We explore this potential, integrating high-quality graphene p–n junctions within two types of planar transmission line circuits to modulate and emit picosecond pulses. In a coplanar strip line geometry, we demonstrate the electrical modulation of THz signal transmission by 95%. In a Goubau waveguide geometry, we achieve complete gate-tunable control over THz emission from a photoexcited graphene junction. These studies inform the development of on-chip signal manipulation and highlight prospects for 2D materials in THz applications.
Materials Science and Engineering | Physics
Island, J. O.,
Haque, S. R.,
Averitt, R. D.,
Young, A. F.
On-Chip Terahertz Modulation and Emission With Integrated Graphene Junctions.
Applied Physics Letters, 116
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