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Microbial biosensors are analytical devices that utilize living microbes to detect specific substances through measurable signals. These devices consist of two main components: biosensing organisms and signal-transducing elements. Biosensing organisms, such as Escherichia coli or Saccharomyces cerevisiae, are typically housed in multiwell plates connected to transducers, enabling rapid, real-time detection of target analytes.Signal Generation MechanismWhen a target analyte—such as...

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2D Gallium Sulfide-Based 1D Photonic Crystal Biosensor for Glucose Concentration Detection.

Abdelkader Abderrahmane1,2, Khaled Senouci2, Belkacem Hachemi3

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Summary

Two novel 2D Van der Waals material-based photonic crystal biosensors were designed for blood glucose monitoring. These label-free sensors demonstrate high sensitivity and a low limit of detection, offering a promising platform for accurate glucose level assessment.

Keywords:
1D photonic crystalBragg reflectorbiosensordiabetesglucose detector

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Area of Science:

  • Photonics
  • Materials Science
  • Biomedical Engineering

Background:

  • Unidimensional photonic crystals are widely researched for blood glucose measurement.
  • Existing biosensors often require labels, complicating detection processes.

Purpose of the Study:

  • To propose and analyze two novel 1D photonic crystal biosensor designs using 2D Van der Waals materials.
  • To evaluate the performance of these biosensors for blood glucose concentration detection.

Main Methods:

  • Numerical analysis using the transfer matrix method.
  • Investigation of photonic crystal properties with and without defect layers.
  • Assessment of biosensor performance as a function of glucose concentration.

Main Results:

  • Two designs utilizing [GaS/Mica] and [GaS/G] multilayers were proposed.
  • High sensitivity (832 nm/RIU), figure-of-merit (1.46 × 10^5 RIU^-1), and Q-factor (>10^5) were achieved.
  • A minimum limit of detection of 3.4 × 10^-7 RIU was determined, with sensitivity enhanced nearly 5-fold in one design.

Conclusions:

  • The proposed 2D Van der Waals material-based photonic crystal biosensors are suitable for sensitive and reliable blood glucose detection.
  • These label-free biosensors represent a promising advancement in glucose monitoring technology.
  • Further structural modifications can significantly enhance sensor sensitivity.