Scholarlink

<p>This study presents a technique for achieving high third-harmonic generation (THG) conversion efficiency using a bilayer graphene/dielectric/graphene metasurface structure in the terahertz (THz) range. The enhanced THG mechanism leverages gap- and cavity-plasmon resonances at the resonant frequency, leading to effective localization and significant amplification of the electromagnetic (EM) wave on the graphene surface and within the gap region. This is due to the induction of both gap- and cavity-plasmon resonances. Introducing a metallic substrate beneath the bilayer structure narrows the resonant response bandwidth, resulting in zero transmittance and forming oscillating Fabry-Pérot (FP) waves within the cavity. This field enhancement, combined with graphene’s high nonlinear conductivity, boosts the THG conversion efficiency (CE) by several orders of magnitude, achieving − 24.905&#xa0;dB at relatively low fundamental frequency (FF) input intensities. This device holds promise for various nonlinear optics and THz-integrated circuit applications, including terahertz switches and modulators.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Enhancement of Third-Harmonic Generation Through Plasmonic Gap and Cavity Resonance Modes in Bilayer Graphene/Dielectric/Graphene Metasurfaces

  • 期刊论文

  • 发表日期：

    2025年1月11日

查看全文
  • Chung-Ting Chou Chao,
  • Sy-Hann Chen,
  • Roshan Thotagamuge,
  • Muhammad Raziq Rahimi Kooh,
  • Yuan-Fong Chou Chau

摘要

This study presents a technique for achieving high third-harmonic generation (THG) conversion efficiency using a bilayer graphene/dielectric/graphene metasurface structure in the terahertz (THz) range. The enhanced THG mechanism leverages gap- and cavity-plasmon resonances at the resonant frequency, leading to effective localization and significant amplification of the electromagnetic (EM) wave on the graphene surface and within the gap region. This is due to the induction of both gap- and cavity-plasmon resonances. Introducing a metallic substrate beneath the bilayer structure narrows the resonant response bandwidth, resulting in zero transmittance and forming oscillating Fabry-Pérot (FP) waves within the cavity. This field enhancement, combined with graphene’s high nonlinear conductivity, boosts the THG conversion efficiency (CE) by several orders of magnitude, achieving − 24.905 dB at relatively low fundamental frequency (FF) input intensities. This device holds promise for various nonlinear optics and THz-integrated circuit applications, including terahertz switches and modulators.