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<p>Dielectric metasurfaces with high refractive indices show considerable potential for enhancing the efficiency of nanophotonic devices by effectively manipulating and confining electromagnetic waves at the nanoscale. In this study, we utilize numerical simulations to investigate a slotted dimer metasurface structure fabricated on silicon and quartz substrates. This design exploits the excitation of anapole states to achieve a substantial local electric field enhancement within the slots, reaching an enhancement factor of 280. The proposed structure exhibits a narrow resonant linewidth of 0.16&#xa0;nm, corresponding to an exceptional <i>Q</i> of 6900. This work presents a novel dielectric resonator design paradigm that simultaneously achieves strong near-field localization and ultra-narrowband far-field radiation, demonstrating significant potential for optical sensing and nonlinear applications.</p>

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Multifunctional Dielectric Metasurfaces with High Q Factor Based on Tailored Nonradiative Dark State

  • 期刊论文

  • 发表日期：

    2025年6月14日

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  • Qiao Qiao Wang,
  • Jun Qiao Wang,
  • Hao Zhang,
  • Ye Wen Mei,
  • Jin Yuan Yang

摘要

Dielectric metasurfaces with high refractive indices show considerable potential for enhancing the efficiency of nanophotonic devices by effectively manipulating and confining electromagnetic waves at the nanoscale. In this study, we utilize numerical simulations to investigate a slotted dimer metasurface structure fabricated on silicon and quartz substrates. This design exploits the excitation of anapole states to achieve a substantial local electric field enhancement within the slots, reaching an enhancement factor of 280. The proposed structure exhibits a narrow resonant linewidth of 0.16 nm, corresponding to an exceptional Q of 6900. This work presents a novel dielectric resonator design paradigm that simultaneously achieves strong near-field localization and ultra-narrowband far-field radiation, demonstrating significant potential for optical sensing and nonlinear applications.