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<p>Surface plasmons (SPs) can generate hot electrons through a non-radiative decay process, which makes it possible to produce a hot electron photodetector that is not limited by the width of the material band gap. In this paper, a polarization-independent 2D array based on composite metal grating is proposed. The 2D array exhibits excellent broadband characteristics within the long-wave near-infrared(LW-NIR) range of 1200&#xa0;nm to 1800&#xa0;nm. Specifically, the average absorption coefficient between 1200&#xa0;nm and 1510&#xa0;nm exceeds 0.8, with a peak value of 0.91 at 1360&#xa0;nm. This is because there are multiple boundary angles in the composite metal grating structure, which can effectively excite the surface plasmons, thereby increasing the absorption bandwidth of the device. In terms of electrical performance, the 2D array demonstrates a responsivity exceeding 20&#xa0;mA/W in the wavelength range of 1200&#xa0;nm to 1460&#xa0;nm, with a peak responsivity of 30.9&#xa0;mA/W near 1200&#xa0;nm. Consequently, this 2D array holds significant potential for applications in remote sensing, communication, detection, and other related fields.</p>

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Wideband polarization-independent 2D-array hot electron photodetector

  • 期刊论文

  • 发表日期：

    2025年6月28日

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  • Hao Huang,
  • Zidong Chen,
  • Bowen Zhang,
  • Ailing Zhang,
  • Fei Liu

摘要

Surface plasmons (SPs) can generate hot electrons through a non-radiative decay process, which makes it possible to produce a hot electron photodetector that is not limited by the width of the material band gap. In this paper, a polarization-independent 2D array based on composite metal grating is proposed. The 2D array exhibits excellent broadband characteristics within the long-wave near-infrared(LW-NIR) range of 1200 nm to 1800 nm. Specifically, the average absorption coefficient between 1200 nm and 1510 nm exceeds 0.8, with a peak value of 0.91 at 1360 nm. This is because there are multiple boundary angles in the composite metal grating structure, which can effectively excite the surface plasmons, thereby increasing the absorption bandwidth of the device. In terms of electrical performance, the 2D array demonstrates a responsivity exceeding 20 mA/W in the wavelength range of 1200 nm to 1460 nm, with a peak responsivity of 30.9 mA/W near 1200 nm. Consequently, this 2D array holds significant potential for applications in remote sensing, communication, detection, and other related fields.