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<p>Two-dimensional (2D) materials hold promise for miniaturized photodetectors. With ample exciton resonances, the photodetection range of transition metal dichalcogenides (TMDCs) can be further extended to long wavelengths on a large scale by two-photon absorption (TPA), breaking the limit of their bandgaps. However, the conversion efficiency of TPA usually remains low despite resonant nonlinear optical effects. Here, we present a plasmonic metasurface-enhanced 2D TMDC photodetector by means of high-order multipoles with anapole states, as well as quasi-bound states in the continuum, operating efficiently in the near-infrared second (NIR-Ⅱ) window at room temperature. The optical response of the MoS<sub>2</sub>/WSe<sub>2</sub> heterostructure is simultaneously enhanced by the interlayer exciton resonances and by the hot carrier injection from the plasmonic metasurface. By optimizing the metasurface design, the responsivity can reach 1.35 A/W at 1550 nm, which is ~5 × 10<sup>4</sup> times larger than that of a MoS<sub>2</sub>/WSe<sub>2</sub> heterostructure on SiO<sub>2</sub>/Si substrate. Furthermore, the broken mirror symmetry of the structure enables a chiral photoelectric response with discrimination ratios up to 7.2. Our study offers a promising platform for applications in NIR-Ⅱ bio-imaging, telecommunication, and on-chip spectroscopic sensing.</p>

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Anapole-state-enhanced 2D chiral photodetector operating in the near-infrared second window

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月18日

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  • Qi-hang Zhang,
  • Zi-hao Dong,
  • Kai Liu,
  • Shao-jie Fu,
  • Xu-hao Hong,
  • Yu-lin Cao,
  • Chao Zhang,
  • Jun Du,
  • Yan-qing Lu,
  • Yong-yuan Zhu,
  • Yan-feng Chen,
  • Xue-jin Zhang

摘要

Two-dimensional (2D) materials hold promise for miniaturized photodetectors. With ample exciton resonances, the photodetection range of transition metal dichalcogenides (TMDCs) can be further extended to long wavelengths on a large scale by two-photon absorption (TPA), breaking the limit of their bandgaps. However, the conversion efficiency of TPA usually remains low despite resonant nonlinear optical effects. Here, we present a plasmonic metasurface-enhanced 2D TMDC photodetector by means of high-order multipoles with anapole states, as well as quasi-bound states in the continuum, operating efficiently in the near-infrared second (NIR-Ⅱ) window at room temperature. The optical response of the MoS2/WSe2 heterostructure is simultaneously enhanced by the interlayer exciton resonances and by the hot carrier injection from the plasmonic metasurface. By optimizing the metasurface design, the responsivity can reach 1.35 A/W at 1550 nm, which is ~5 × 104 times larger than that of a MoS2/WSe2 heterostructure on SiO2/Si substrate. Furthermore, the broken mirror symmetry of the structure enables a chiral photoelectric response with discrimination ratios up to 7.2. Our study offers a promising platform for applications in NIR-Ⅱ bio-imaging, telecommunication, and on-chip spectroscopic sensing.