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<p>The development of highly sensitive nanosensors for temperature measurement is essential in various fields such as biomedical diagnostics, environmental monitoring, and industrial applications. In this paper, we propose a temperature nanosensor based on multiple Fano resonances in a waveguide-cavity integrated system. The unique interference between discrete cavity modes and continuous waveguide modes generates asymmetric Fano line shapes, which are highly sensitive to temperature, resulting in a sensitivity of 0.2042&#xa0;nm/℃ and a figure of merit (FOM) of 28.2. By carefully engineering the waveguide-cavity structure and leveraging multiple Fano resonances, we demonstrate that this system offers enhanced precision and sensitivity for temperature detection, achieving a sensitivity of 0.3083&#xa0;nm/℃ and an exceptionally high FOM of 76.1. Moreover, a multimode interference–coupled-mode theory is developed to quantitatively clarify the origin of multiple Fano resonances, and the exceptionally high FOM in the visible and near-infrared region opens a new avenue for nanoscale thermometer design.</p>

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Temperature Nanosensor Based on Multiple Fano Resonances in a Waveguide-Cavity Integrated System

  • 期刊论文

  • 发表日期：

    2026年2月8日

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  • Yilin Wang,
  • Jinyu Zhang,
  • Jiaqi He,
  • Zhao Chen

摘要

The development of highly sensitive nanosensors for temperature measurement is essential in various fields such as biomedical diagnostics, environmental monitoring, and industrial applications. In this paper, we propose a temperature nanosensor based on multiple Fano resonances in a waveguide-cavity integrated system. The unique interference between discrete cavity modes and continuous waveguide modes generates asymmetric Fano line shapes, which are highly sensitive to temperature, resulting in a sensitivity of 0.2042 nm/℃ and a figure of merit (FOM) of 28.2. By carefully engineering the waveguide-cavity structure and leveraging multiple Fano resonances, we demonstrate that this system offers enhanced precision and sensitivity for temperature detection, achieving a sensitivity of 0.3083 nm/℃ and an exceptionally high FOM of 76.1. Moreover, a multimode interference–coupled-mode theory is developed to quantitatively clarify the origin of multiple Fano resonances, and the exceptionally high FOM in the visible and near-infrared region opens a new avenue for nanoscale thermometer design.