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arXiv · 2502.08048

Efficiently Laser Driven Terahertz Surface Plasmon Polaritons on Long Metal Wire

Shuoting Shao·Xiangbing Wang·Rong Huang·Guangyue Hu·Min Chen·Huibo Tang·Longyu Kuang·Yuxi Liu·Yuqiu Gu·Yongkun Ding·Ruxin Li·Hongbin Zhuo·Mingyang Yu
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Abstract

We experimentally demonstrate a novel scheme for efficiently generating intense terahertz (THz) surface plasmon polaritons (SPPs) on a sub-wavelength-diameter meter-long metal wire. Driven by a subrelativistic femtosecond laser (a0=0.3, 3 mJ) focused at the wire's midpoint, single-cycle ten-megawatt THz SPPs are excited and propagating bidirectionally along it over 25 cm. The measured laser-to-SPPs energy conversion efficiency is reaching up to ~2.4%, which is the highest value at present. It is proved that the THz SPPs are excited by coherent transition radiation of the subrelativistic laser produced escaping electrons. Particle-in-cell together with CST simulations confirm the experimental observations. Our scheme of using readily available subrelativistic laser should thus be useful to applications requiring terawatt level single-cycle THz SPPs.

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Shuoting Shao, Xiangbing Wang, Rong Huang, Guangyue Hu, Min Chen, Huibo Tang, Longyu Kuang, Yuxi Liu, Yuqiu Gu, Yongkun Ding, Ruxin Li, Hongbin Zhuo, Mingyang Yu. 2025-02-12. Efficiently Laser Driven Terahertz Surface Plasmon Polaritons on Long Metal Wire. https://arxiv.org/abs/2502.08048

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