Single-cycle surface plasmon polaritons on a bare metal wire excited by relativistic electrons

W.P.E.M. op ‘t Root, G.J.H. Brussaard, P.W. Smorenburg and O.J. Luiten ()
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W.P.E.M. op ‘t Root: Coherence and Quantum Technology, Eindhoven University of Technology
G.J.H. Brussaard: Coherence and Quantum Technology, Eindhoven University of Technology
P.W. Smorenburg: Coherence and Quantum Technology, Eindhoven University of Technology
O.J. Luiten: Coherence and Quantum Technology, Eindhoven University of Technology

Nature Communications, 2016, vol. 7, issue 1, 1-6

Abstract: Abstract Terahertz (THz) pulses are applied in areas as diverse as materials science, communication and biosensing. Techniques for subwavelength concentration of THz pulses give access to a rapidly growing range of spatial scales and field intensities. Here we experimentally demonstrate a method to generate intense THz pulses on a metal wire, thereby introducing the possibility of wave-guiding and focussing of the full THz pulse energy to subwavelength spotsizes. This enables endoscopic sensing, single-shot subwavelength THz imaging and study of strongly nonlinear THz phenomena. We generate THz surface plasmon polaritons (SPPs) by launching electron bunches onto the tip of a bare metal wire. Bunches with 160 pC charge and ≈6 ps duration yield SPPs with 6–10 ps duration and 0.4±0.1 MV m−1 electric field strength on a 1.5 mm diameter aluminium wire. These are the most intense SPPs reported on a wire. The SPPs are shown to propagate around a 90° bend.

Date: 2016
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DOI: 10.1038/ncomms13769

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