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<p>The excitation of a surface plasma wave (SPW) by a laser incident on a metal surface is found to be efficient in generating terahertz (THz) radiation, having multiple applications in imaging and optics. In this paper, an amplitude-modulated laser, incident on an ATR geometry, resonantly excites a surface plasma wave (SPW) over a rippled metal-free space interface. The generated SPW, which is the effect of mode conversion of laser and externally applied magnetic field at the surface of the metal, exerts a ponderomotive force on electrons at the surface of the metal, providing them with an oscillatory velocity at the laser’s modulation frequency. The beating of the oscillatory velocity with the ripples at the surface produces a nonlinear current, which drives the SPW and becomes a source of THz radiation generation. THz field expression is derived theoretically, and its variations with different parameters are estimated. Our result shows increased THz field strength with increasing magnetic field. The amplitude modulation also plays a crucial role in enhancing the THz field. The results of this model offer a workable technique for THz generation from an amplitude-modulated laser in an ATR geometry.</p>

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Optical terahertz emission from a magnetized metallic surfaces using an amplitude-modulated laser

  • 期刊论文

  • 发表日期：

    2025年4月14日

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  • Avijit Chamoli,
  • Devki Nandan Gupta,
  • Amit Raj Singh,
  • Vijay Kumar

摘要

The excitation of a surface plasma wave (SPW) by a laser incident on a metal surface is found to be efficient in generating terahertz (THz) radiation, having multiple applications in imaging and optics. In this paper, an amplitude-modulated laser, incident on an ATR geometry, resonantly excites a surface plasma wave (SPW) over a rippled metal-free space interface. The generated SPW, which is the effect of mode conversion of laser and externally applied magnetic field at the surface of the metal, exerts a ponderomotive force on electrons at the surface of the metal, providing them with an oscillatory velocity at the laser’s modulation frequency. The beating of the oscillatory velocity with the ripples at the surface produces a nonlinear current, which drives the SPW and becomes a source of THz radiation generation. THz field expression is derived theoretically, and its variations with different parameters are estimated. Our result shows increased THz field strength with increasing magnetic field. The amplitude modulation also plays a crucial role in enhancing the THz field. The results of this model offer a workable technique for THz generation from an amplitude-modulated laser in an ATR geometry.