Ultra-narrow-band Infrared Absorbers Based on Surface Plasmon Resonance


Due to the advantage of improving the sensing performance, narrow-band metamaterial perfect absorbers (MPAs) have attracted much attention in the sensor field. Here, we propose an ultra-narrow-band infrared absorber (UNBIRA) based on localized surface plasmon resonance. The peak absorption of the UNBIRA exceeds 99% with the full width at half maximum (FWHM) of 1.94 nm and 6.32 nm for transverse electric (TE) wave and transverse magnetic (TM) wave in 1.5–1.8 μm. The corresponding Q-factors for TE wave and TM wave are 817 and 266, respectively. When used as an infrared refractive index sensor, the sensitivity of UNBIRA is as high as 1632.5 nm/RIU for TE wave and 1647.5 nm/RIU for TM wave. Accordingly, the figure of merits (FOMs) of 816.2/RIU for TE wave and 260.7/RIU for TM wave are achieved. This UNBIRA possesses a simple geometry structure and an excellent sensing performance, implying a great potential for application of ultra-narrow infrared sensing or detecting.

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Data Availability

All data generated or analyzed during this study are included in this article.



Metamaterial perfect absorber


Ultra-narrow-band infrared absorber


Full width at half maximum


The figure of merit


Quality factor




Transverse electric


Transverse magnetic


Perfectly matched layer


Refractive index of the ambient environment


Refractive index change unit


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This work was supported by the National Natural Science Foundation of China under Grant 61901268 and 61975209, the Sichuan Science and Technology Program under Grant 2020JDJQ0006, and Postdoctoral Foundation of China under Grant 2019M663464.

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All authors contributed to the study. Liming Yuan, Aobo Ren and Jiang Wu contributed to the conception of the study. Jianming Liao performed the simulation. Xiangang Luo and Cheng Huang contributed significantly to analysis and manuscript preparation. Liming Yuan and Aobo Ren performed the data analyses and wrote the manuscript. Chen Ji helped perform the analysis with constructive discussions. All authors read and approved the final manuscript.

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Correspondence to Xiangang Luo.

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Yuan, L., Liao, J., Ren, A. et al. Ultra-narrow-band Infrared Absorbers Based on Surface Plasmon Resonance. Plasmonics (2021). https://doi.org/10.1007/s11468-021-01384-y

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  • Metamaterial
  • Ultra-narrow absorber
  • Refractive index sensor
  • Surface plasmon resonance