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<p>This article analyzes the near-field response of a multi-layer bow tie nanoantenna consisting of consecutive silica (sio<sub>2</sub>) and gold layers located on a platform of sapphire to an electric field with linear polarity. It is demonstrated that with interaction control between surface-localized plasmons, a proper linear amplifier with linear polarity in the central wavelength of 800&#xa0;nm can be achieved. The highest and lowest amplification is about 70 and 44.5 times. In other words, in a volume of dimensions 5&#xa0;nm * 50&#xa0;nm * 2&#xa0;nm, an amplification of more than 44 times (16.45&#xa0;dB) can be achieved. Compared to a structure similar to this in which the material of all layers is from gold (gold bow tie antenna), the suggested multi-layer structure can bring five times more amplification in the electric field. This proper amplifier can be utilized in different applications in the photonic field, such as optical imaging, particle manipulation, bioassay, and improvement of solar cell performance, and in the laser field, especially the generation of high-order harmonic pulses and attosecond pulses.</p> Graphical abstract <p></p>

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Extra field enhancement in multi-layer bowtie nanoantenna for titanium sapphire laser beam

  • 期刊论文

  • 发表日期：

    2026年7月20日

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  • Sakineh Nazarpoor,
  • Masoud Mohebbi,
  • Abdolrahim Baharvand

摘要

This article analyzes the near-field response of a multi-layer bow tie nanoantenna consisting of consecutive silica (sio2) and gold layers located on a platform of sapphire to an electric field with linear polarity. It is demonstrated that with interaction control between surface-localized plasmons, a proper linear amplifier with linear polarity in the central wavelength of 800 nm can be achieved. The highest and lowest amplification is about 70 and 44.5 times. In other words, in a volume of dimensions 5 nm * 50 nm * 2 nm, an amplification of more than 44 times (16.45 dB) can be achieved. Compared to a structure similar to this in which the material of all layers is from gold (gold bow tie antenna), the suggested multi-layer structure can bring five times more amplification in the electric field. This proper amplifier can be utilized in different applications in the photonic field, such as optical imaging, particle manipulation, bioassay, and improvement of solar cell performance, and in the laser field, especially the generation of high-order harmonic pulses and attosecond pulses.

Graphical abstract