Enhanced terahertz radiation from nanorod array targets irradiated by ultraintense laser pulses

Ultraintense laser interactions with a metal foil offer an emerging approach toward the generation of intense terahertz (THz) radiation, and how to improve the THz generation efficiency remains an open question. Here, we report the enhanced generation of THz radiation from ultraintense laser-irradiated nanostructured targets where metallic nanorod arrays are fabricated on the front surface of foil targets. The influences of nanorod lengths on the THz radiation emitted from the foil rear surface are investigated experimentally. Compared to the case of flat foil targets, a maximum enhancement in the THz pulse energy by a factor of 2.3 is observed by varying the nanorod length, and the THz peak emission direction moves toward the target surface with longer nanorods. Measurements of escaping fast electrons imply that the boosted THz yield is attributed to the enhanced laser absorption, and thus, the substantial increase in the fast-electron number. Particle-in-cell simulations reproduce well the experimental results.

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Publication Details

Journal
Physics of Plasmas
Published
2025-04-01
DOI
https://doi.org/10.1063/5.0255950
Primary Topic
Terahertz technology and applications
Type
article
Field-Weighted Citation Impact
0.00

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article

Enhanced terahertz radiation from nanorod array targets irradiated by ultraintense laser pulses

Huihui Song, Guoqian Liao, Tianze Wang, Hao Liu et al.
Physics of Plasmas
Terahertz technology and applications
article

Enhanced terahertz radiation from nanorod array targets irradiated by ultraintense laser pulses

Huihui Song, Guoqian Liao, Tianze Wang, Hao Liu, Zhangsen Chen, Shangqing Li, S. Mondal, X. Zhang, Shuhui Sun, T. Ozaki, Yutong Li, Dan Wang, J. Ruan
article en

Abstract

Ultraintense laser interactions with a metal foil offer an emerging approach toward the generation of intense terahertz (THz) radiation, and how to improve the THz generation efficiency remains an open question. Here, we report the enhanced generation of THz radiation from ultraintense laser-irradiated nanostructured targets where metallic nanorod arrays are fabricated on the front surface of foil targets. The influences of nanorod lengths on the THz radiation emitted from the foil rear surface are investigated experimentally. Compared to the case of flat foil targets, a maximum enhancement in the THz pulse energy by a factor of 2.3 is observed by varying the nanorod length, and the THz peak emission direction moves toward the target surface with longer nanorods. Measurements of escaping fast electrons imply that the boosted THz yield is attributed to the enhanced laser absorption, and thus, the substantial increase in the fast-electron number. Particle-in-cell simulations reproduce well the experimental results.

Physics of PlasmasVol. 32(4)
Chinese Academy of Sciences (CN), Institut National de la Recherche Scientifique (CA), ELI-HU Research and Development Non-Profit (HU), Physical Sciences (United States) (US), Songshan Lake Materials Laboratory (CN), FZU ‒ Institute of Physics of the Academy of Sciences of the Czech Republic (CZ), University of Chinese Academy of Sciences (CN)
National Natural Science Foundation of China
Openalex Percentile: Top 95%
Terahertz technology and applications
DOIOpen Access PDFOpenAlex
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