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Abstract <p>In this work, we present a model to study dynamical configurations of plasma created through the ionization of small gas targets by intense bichromatic femtosecond laser pulses. Strong time-dependent currents excited in this interaction lead to the emission of high-power terahertz waves. After the release of a short terahertz pulse, a nearly non-radiating plasma configuration is formed, even though the charge and current distributions remain time-dependent. It is known from classical electrodynamics that accelerated charged particles emit electromagnetic radiation. However, this statement may not be true if a continuous distribution modeling charges and currents in macroscopic systems is considered. In this case, time-dependent space-limited, non-radiating arrangements of charges and currents may exist [<CitationRef CitationID="CR1">1</CitationRef>, <CitationRef CitationID="CR2">2</CitationRef>]. In theory, the number of such configurations is large, but their practical realization was believed to be impossible for a long time. The experimental evidence of the toroidal multipoles [<CitationRef CitationID="CR3">3</CitationRef>, <CitationRef CitationID="CR4">4</CitationRef>] allowing the construction of non-radiating states was observed recently while studying the optical properties of metamaterials [<CitationRef CitationID="CR5">5</CitationRef>]. We examine the formation of non-radiating distributions in a plasma arising from the ionization of atomic gases by an intense laser pulse by means of particle-in-cell simulations.</p>

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Numerical Simulations of Nonstationary Non-radiating States of Laser-plasma

  • 期刊论文

  • 发表日期：

    2026年1月1日

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  • T. V. Liseykina,
  • V. A. Vshivkov

摘要

Abstract

In this work, we present a model to study dynamical configurations of plasma created through the ionization of small gas targets by intense bichromatic femtosecond laser pulses. Strong time-dependent currents excited in this interaction lead to the emission of high-power terahertz waves. After the release of a short terahertz pulse, a nearly non-radiating plasma configuration is formed, even though the charge and current distributions remain time-dependent. It is known from classical electrodynamics that accelerated charged particles emit electromagnetic radiation. However, this statement may not be true if a continuous distribution modeling charges and currents in macroscopic systems is considered. In this case, time-dependent space-limited, non-radiating arrangements of charges and currents may exist [1, 2]. In theory, the number of such configurations is large, but their practical realization was believed to be impossible for a long time. The experimental evidence of the toroidal multipoles [3, 4] allowing the construction of non-radiating states was observed recently while studying the optical properties of metamaterials [5]. We examine the formation of non-radiating distributions in a plasma arising from the ionization of atomic gases by an intense laser pulse by means of particle-in-cell simulations.