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This study introduces a terahertz metamaterial perfect absorber biosensor for detecting fungi, yeast, and pesticides. The sensor demonstrates high absorption and significant frequency shifts, offering potential for agricultural and biomedical applications.

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Area of Science:

  • Terahertz (THz) technology
  • Metamaterials
  • Biosensing

Background:

  • Terahertz metamaterial perfect absorbers (MPAs) offer unique electromagnetic properties.
  • Existing biosensing methods may lack sensitivity or specificity for certain analytes.
  • Microorganisms and pesticide residues pose significant challenges in agriculture and food safety.

Purpose of the Study:

  • To develop and characterize a multi-resonant THz MPA-based biosensor.
  • To enable sensitive detection of microorganisms and wheat pesticides.
  • To explore the sensor's potential for label-free biosensing in various applications.

Main Methods:

  • Design and simulation of a THz MPA with resonators sized for target analytes.
  • Optimization of MPA performance through structural parameter mapping.
  • Development of an equivalent circuit model for validation.
  • Investigation of THz wave incidence angle effects.

Main Results:

  • Achieved nearly 100% absorption in the 0-3.8 THz range.
  • Observed significant frequency shifts for various fungi, yeast, and pesticides.
  • Confirmed model predictions align with simulation results.
  • Demonstrated stability of the lower resonance peak (1.79 THz) against incidence angle variations.

Conclusions:

  • The THz MPA biosensor is highly effective for detecting a wide range of pesticides and microorganisms.
  • The sensor's sensitivity to dielectric changes makes it suitable for label-free biosensing.
  • This technology holds promise for agricultural monitoring, food safety, and future biomedical diagnostics.