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<p>We present a method to enhance the sensitivity of detectors that feature a metallic antenna on top of a conducting film with a dielectric substrate. We propose leveraging the Fabry–Pérot interference effect to maximize the electromagnetic energy within the film. To demonstrate this concept, we fabricated THz detectors consisting of a bow-tie antenna on a p-type HgCdTe film with a CdZnTe substrate and examined their sensitivity to THz radiation. We observed that the electromagnetic energy in the film oscillates with frequency due to the Fabry–Pérot interference effect. Consequently, the detector sensitivity can be significantly improved by adjusting the substrate thickness. The experimental results are consistent with the proposed method, which can be effective for optimizing single-frequency or narrow-band detectors, even beyond the THz frequency range.</p>

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Using Fabry–Pérot Interference Effect for Enhancing Sensitivity of HgCdTe-Based THz Detectors

  • 期刊论文

  • 发表日期：

    2026年2月27日

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  • Z. Tsybrii,
  • S. Kukhtaruk,
  • N. Kukhtaruk,
  • V. Zabudsky,
  • I. Lysiuk,
  • M. Vuichyk,
  • A. Korchovyi,
  • M. Boltovets,
  • K. Svezhentsova,
  • V. Dzhagan

摘要

We present a method to enhance the sensitivity of detectors that feature a metallic antenna on top of a conducting film with a dielectric substrate. We propose leveraging the Fabry–Pérot interference effect to maximize the electromagnetic energy within the film. To demonstrate this concept, we fabricated THz detectors consisting of a bow-tie antenna on a p-type HgCdTe film with a CdZnTe substrate and examined their sensitivity to THz radiation. We observed that the electromagnetic energy in the film oscillates with frequency due to the Fabry–Pérot interference effect. Consequently, the detector sensitivity can be significantly improved by adjusting the substrate thickness. The experimental results are consistent with the proposed method, which can be effective for optimizing single-frequency or narrow-band detectors, even beyond the THz frequency range.