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<p>This paper presents a novel metal–insulator-metal (MIM) microbolometer structure incorporating plasmonic metamaterial absorbers to enhance long-wave infrared (LWIR) detection significantly. Utilizing an innovative Al–LiNbO<sub>3</sub>–Au configuration, the proposed design strategically employs aluminum for its superior absorbance and cost-effectiveness, coupled with a gold mirror to prevent light penetration and ensure high reflectance. This structure aims to achieve high and selective absorption in the midwave infrared (MWIR) and LWIR regions. By optimizing the geometry of the absorber, specifically the lateral dimensions of the aluminum resonator within the array, our results demonstrate high absorbance rates of up to 99.26% at 10.75&#xa0;µm, a significant improvement over the previous design. The integration of a VO<sub>x</sub> thermistor enhances temperature sensitivity, making this microbolometer suitable for high-performance applications in thermal imaging and photothermal detection. The adaptability of the design enables precise tuning of the absorption spectrum, catering to specific infrared (IR) applications and enhancing the capabilities of uncooled infrared detectors.</p>

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Simulation-Based Design and Optimization of a Plasmonic Metamaterial Absorber for Long-Wave Infrared Microbolometers

  • 期刊论文

  • 发表日期：

    2026年7月12日

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  • Asrafuzzaman Khan Nahin,
  • A. Abdur Rahman Akib,
  • Rabiul Al Mahmud,
  • Khurram Karim Qureshi

摘要

This paper presents a novel metal–insulator-metal (MIM) microbolometer structure incorporating plasmonic metamaterial absorbers to enhance long-wave infrared (LWIR) detection significantly. Utilizing an innovative Al–LiNbO3–Au configuration, the proposed design strategically employs aluminum for its superior absorbance and cost-effectiveness, coupled with a gold mirror to prevent light penetration and ensure high reflectance. This structure aims to achieve high and selective absorption in the midwave infrared (MWIR) and LWIR regions. By optimizing the geometry of the absorber, specifically the lateral dimensions of the aluminum resonator within the array, our results demonstrate high absorbance rates of up to 99.26% at 10.75 µm, a significant improvement over the previous design. The integration of a VOx thermistor enhances temperature sensitivity, making this microbolometer suitable for high-performance applications in thermal imaging and photothermal detection. The adaptability of the design enables precise tuning of the absorption spectrum, catering to specific infrared (IR) applications and enhancing the capabilities of uncooled infrared detectors.