On-chip terahertz modulation and emission with integrated graphene junctions

Abstract

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.

11 pages, 9 figures, including supplementary materials

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Cited by in corpus (6)

• On-chip time-domain terahertz spectroscopy of superconducting films below the diffraction limit
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• Cavity electrodynamics of van der Waals heterostructures
• On-chip coherent frequency-domain THz spectroscopy for electrical transport
• Efficient free-space to chip coupling of ultrafast sub-ps THz pulse for biomolecule fingerprint sensing
• Monolithic optoelectronic circuit design for on-chip terahertz applications