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    Terahertz waveform shifting and broadening along a dc-electric-field-biased femtosecond laser plasma filament

    Juan Long1,2, Tiejun Wang1,2,*, Yaoxiang Liu1,2, Yingxia Wei1,2, Chaopeng Yang1,2, Xianwang Li1,3, Rao Adeel Un Nabi1,2, Ying Xu1,4, and Yuxin Leng1,2

    • 1State Key Laboratory of Ultra-intense Laser Science and Technology, Shanghai Institute of Optics and Fine Mechanics and CAS Center for Excellence in Ultra-intense Laser Science, Chinese Academy of Sciences, Shanghai 201800, China
    • 2Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
    • 3College of Physics, Guizhou University, Guiyang, Guizhou 550025, China
    • 4MOE Key Laboratory of Advanced Micro-structured Materials, Shanghai Frontiers Science Center of Digital Optics, Institute of Precision Optical Engineering, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China

    • *Contact author: tiejunwang@siom.ac.cn
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    Phys. Rev. A 112, 023519 – Published 27 August, 2025

    DOI: https://doi.org/10.1103/55w8-m9jv

    Abstract

    Longitudinally resolved terahertz radiations from tip-electrodes dc-electric-field-biased laser filament were generated. The terahertz waveform undergoes a shifting of 0.43 ps and broadening of 0.46 ps in the time domain during its propagation in the 40-mm-long filament. Both experimental and numerical results have proved that the propagation of THz in a dc-biased filament waveguide lead to the terahertz waveform shifting and broadening.

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    Phys. Rev. A 112, 023519– Published 27 August, 2025
    • Received 25 June 2025
    • Accepted 11 August 2025
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