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

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.

SUBMITTER: Op 't Root WP 

PROVIDER: S-EPMC5196230 | biostudies-other | 2016 Dec

REPOSITORIES: biostudies-other

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

Op 't Root W P E M WP   Brussaard G J H GJ   Smorenburg P W PW   Luiten O J OJ  

Nature communications 20161223

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-s  ...[more]