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On-chip terahertz modulation and emission with integrated graphene junctions
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The efficient modulation and control of ultrafast signals on-chip is of central importance in terahertz (THz) communications and a promising 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 stripline geometry, we demonstrate 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.
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Cited by 1 Pith paper
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Monolithic optoelectronic circuit design for on-chip terahertz applications
A capacitively coupled coplanar stripline circuit produces purer odd-mode terahertz propagation with higher bandwidth and field strength than conventional DC-coupled designs.
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