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Abstract <p>The discrete source method was adapted to calculate the field intensity in a nanometer gap of a pair of plasmonic nanoparticles taking into account quantum effects described by mesoscopic boundary conditions with Feibelman parameters. Based on a computational experiment, it was found that, for noble metal particles, taking into account the quantum effect leads to a blue shift of the surface plasmon resonance (SPR) and to damping of its amplitude. In the case of an alkali metal, taking into account the quantum effect leads to a red shift of SPR, and the field intensity in the gap enhances when the gap is reduced to 1–2 nm. Analysis of the intensity distribution over the particle surface revealed that its highest values are achieved at the ends of the particles, with an absolute maximum observed at the ends facing toward the gap. In addition, it was found that the field intensity along the particle surface can vary by four orders of magnitude over a length of only 12 nm, which is only 1.5% of the incident wavelength.</p>

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Study of Resonance Properties of Paired Nanoparticles with Mesoscopic Boundary Conditions by the Discrete Source Method

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • Yu. A. Eremin,
  • V. V. Lopushenko

摘要

Abstract

The discrete source method was adapted to calculate the field intensity in a nanometer gap of a pair of plasmonic nanoparticles taking into account quantum effects described by mesoscopic boundary conditions with Feibelman parameters. Based on a computational experiment, it was found that, for noble metal particles, taking into account the quantum effect leads to a blue shift of the surface plasmon resonance (SPR) and to damping of its amplitude. In the case of an alkali metal, taking into account the quantum effect leads to a red shift of SPR, and the field intensity in the gap enhances when the gap is reduced to 1–2 nm. Analysis of the intensity distribution over the particle surface revealed that its highest values are achieved at the ends of the particles, with an absolute maximum observed at the ends facing toward the gap. In addition, it was found that the field intensity along the particle surface can vary by four orders of magnitude over a length of only 12 nm, which is only 1.5% of the incident wavelength.