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Modeling terahertz emission from the target rear side during intense laser-solid interactions.

A Woldegeorgis1,2, S Herzer1, M Almassarani1,2

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Summary

Relativistic laser-solid target interactions generate broadband terahertz radiation. This study presents a numerical model explaining the physical processes behind terahertz emission from the target rear surface.

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Area of Science:

  • Physics
  • Plasma Physics
  • Laser-Matter Interaction

Background:

  • Relativistic laser-solid target interactions are known sources of terahertz (THz) radiation.
  • Broadband THz radiation is emitted from both front and rear surfaces of laser-irradiated targets.
  • Experimental generation of high-power, ultrashort THz pulses from the rear surface is established, but the underlying physics remains unclear.

Purpose of the Study:

  • To present a numerical model for simulating relativistic laser-solid target interactions.
  • To elucidate the physical mechanisms responsible for broadband THz radiation generation at the target rear surface.
  • To reproduce and explain key aspects of experimental observations.

Main Methods:

  • Development of a numerical model focusing on charged particle dynamics at the target rear surface.
  • Simulation of the evolution of the charge separation field.
  • Analysis of the model to identify dominant contributors to THz emission.

Main Results:

  • The numerical model successfully reproduces several experimental findings.
  • The model highlights the crucial role of charged particle dynamics and charge separation fields.
  • Key physical processes contributing to broadband THz emission from the rear surface are identified.

Conclusions:

  • The presented numerical model provides a framework for understanding THz generation in laser-solid interactions.
  • Charged particle dynamics and charge separation fields are critical for rear-surface THz emission.
  • This work advances the understanding of high-power THz pulse generation mechanisms.