Efficient terahertz emission from InAs nanowires

Abstract

We observe intense pulses of far-infrared electromagnetic radiation emitted from arrays of InAs nanowires. The THz radiation power efficiency of these structures is about 15 times higher compared to a planar InAs substrate. This is explained by the preferential orientation of coherent plasma motion to the wire surface, which overcomes radiation trapping by total-internal reflection. We present evidence that this radiation originates from a low-energy acoustic surface plasmon mode of the nanowire. This is supported by independent measurements of electronic transport on individual nanowires, ultrafast THz spectroscopy and theoretical analysis. Our combined experiments and analysis further indicate that these plasmon modes are specific to high aspect ratio geometries.

12 pages, 7 figures

References in corpus (3)

• Unusually strong space-charge-limited current in thin wires
• Diameter-Dependent Electronic Transport Properties of Au-Catalyst/Ge-Nanowire Schottky Diodes
• Observation of Space-Charge-Limited Transport in InAs Nanowires

Cited by in corpus (5)

• Ultrafast single-nanowire multi-terahertz spectroscopy with sub-cycle temporal resolution
• Cavity-excited Huygens' metasurface antennas: near-unity aperture efficiency from arbitrarily-large apertures
• Persistent enhancement of the carrier density in electron irradiated InAs nanowires
• Nanorod Size Dependence of Coherent Coupling between Individual and Collective Excitations via Transverse Electromagnetic Field
• Kinetic theory of surface plasmon polariton in semiconductor nanowires