Photonics (Apr 2024)

The Application of Optical Sensors with Built-in Anchor-like Cavities in the Detection of Hemoglobin Concentration

  • Wen Jiang,
  • Shubin Yan,
  • Yiru Su,
  • Chong Wang,
  • Taiquan Wu,
  • Yang Cui,
  • Chuanhui Zhu,
  • Yi Zhang,
  • Xiangyang Mu,
  • Guowang Gao

DOI
https://doi.org/10.3390/photonics11050402
Journal volume & issue
Vol. 11, no. 5
p. 402

Abstract

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This paper introduces a refractive index sensor based on Fano resonance, utilizing a metal–insulator–metal (MIM) waveguide structure with an Anchor-like cavity. This study utilizes the finite element method (FEM) for analyzing the propagation characteristics of the structure. The evaluation concentrated on assessing how the refractive index and the structure’s geometric parameters affect its sensing characteristics. The designed structure demonstrates optimum performance, achieving a maximum sensitivity of 2440 nm/RIU and an FOM of 63. Given its high sensitivity, this nanoscale refractive index sensor is ideal for detecting hemoglobin concentrations in blood, and the sensor’s sensitivity is 0.6 nm·g/L, aiding in clinical prevention and treatment.

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