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<p>We numerically investigate the near-infrared light absorption enhancement of a graphene monolayer, demonstrating ultra-broad bandwidth and nearly 100% electric modulation depth. This broadband absorption arises from multiple closely spaced magnetic resonance modes, which are generated by the plasmonic hybridization of silver (Ag) nanostrips and an Ag substrate. The absorption of graphene exhibits a sharp transition from its maximum value to nearly zero within a narrow Fermi energy range, enabling the exceptional modulation depth and the electric switching effect. The broadband absorption with high electric tunability can significantly enhance the performance of graphene-based optoelectronic devices, such as broadband photodetectors and high-speed modulators in optical fiber telecommunication system.</p>

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Graphene absorption enhancement with ultrabroad bandwidth and complete modulation near 1550 nm communication wavelength

  • 期刊论文

  • 发表日期：

    2025年12月3日

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  • Chaojun Tang,
  • Hongyi Cao,
  • Qingmiao Nie,
  • Fan Gao,
  • Juan Deng,
  • Yijun Tang,
  • Bo Yan,
  • Fanxin Liu,
  • Zhendong Yan,
  • Ping Gu

摘要

We numerically investigate the near-infrared light absorption enhancement of a graphene monolayer, demonstrating ultra-broad bandwidth and nearly 100% electric modulation depth. This broadband absorption arises from multiple closely spaced magnetic resonance modes, which are generated by the plasmonic hybridization of silver (Ag) nanostrips and an Ag substrate. The absorption of graphene exhibits a sharp transition from its maximum value to nearly zero within a narrow Fermi energy range, enabling the exceptional modulation depth and the electric switching effect. The broadband absorption with high electric tunability can significantly enhance the performance of graphene-based optoelectronic devices, such as broadband photodetectors and high-speed modulators in optical fiber telecommunication system.