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<p>This study presents an analytical investigation of terahertz (THz) generation from obliquely incident laser beams interacting with the anharmonic nanoparticles. The model incorporates the effects of nanoparticle density gradients, described by an exponential ramp profile, and the nonlinear response of nanoparticles. Numerical simulations were performed to analyze the influence of incidence angle, density gradient, interparticle spacing, and anharmonicity on THz amplitude. The results demonstrate a strong angular dependence of THz generation, with maximum amplitude at near-normal incidence. The THz amplitude decreases with the increasing slope parameter of the density ramp. The presence of a density ramp enhances THz generation. Smaller interparticle spacings result in higher THz amplitudes, emphasizing the importance of collective effects, while anharmonicity amplifies THz output by increasing the system’s nonlinearity. By exploring the effects of density gradients, inter-particle spacing, and anharmonicity, the model reveals broadband THz emission capabilities. The findings provide insights for optimizing the THz generation from nanoparticles by controlling these parameters and hold significant promise for applications in next-generation wireless communications (5&#xa0;G/6&#xa0;G), spectroscopic analysis, and non-invasive medical imaging, where efficient and broadband THz sources are crucial.</p>

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Terahertz Generation from Anharmonic Nanoparticles under Oblique Laser Excitation

  • 期刊论文

  • 发表日期：

    2025年5月31日

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  • Anuj Dandain,
  • Shivani Vij,
  • Niti Kant,
  • Oriza Kamboj

摘要

This study presents an analytical investigation of terahertz (THz) generation from obliquely incident laser beams interacting with the anharmonic nanoparticles. The model incorporates the effects of nanoparticle density gradients, described by an exponential ramp profile, and the nonlinear response of nanoparticles. Numerical simulations were performed to analyze the influence of incidence angle, density gradient, interparticle spacing, and anharmonicity on THz amplitude. The results demonstrate a strong angular dependence of THz generation, with maximum amplitude at near-normal incidence. The THz amplitude decreases with the increasing slope parameter of the density ramp. The presence of a density ramp enhances THz generation. Smaller interparticle spacings result in higher THz amplitudes, emphasizing the importance of collective effects, while anharmonicity amplifies THz output by increasing the system’s nonlinearity. By exploring the effects of density gradients, inter-particle spacing, and anharmonicity, the model reveals broadband THz emission capabilities. The findings provide insights for optimizing the THz generation from nanoparticles by controlling these parameters and hold significant promise for applications in next-generation wireless communications (5 G/6 G), spectroscopic analysis, and non-invasive medical imaging, where efficient and broadband THz sources are crucial.