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An Optical Universal Plasmon-Based Biosensor for Virus ‎‎Detection.

Adel Shaaban1,2, Yi-Chun Du1,3

  • 1Department of Biomedical Engineering, National Cheng Kung University, Tainan, 704 Taiwan.

Journal of Medical and Biological Engineering
|June 26, 2023
PubMed
Summary
This summary is machine-generated.

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A new theoretical framework using a reformulated Fast Fourier Transform Beam Propagation Method (FFT-BPM) enhances surface plasmonic waveguide biosensor simulations. This approach offers reliable assessments for detecting biomaterial refractive index changes.

Area of Science:

  • Optics and Photonics
  • Biomedical Engineering
  • Materials Science

Background:

  • Kretschmann configuration is a subwavelength framework for detecting refractive index changes in biomaterials.
  • Traditional assessments often rely on plane wave excitation transfer matrix methods (TMM), which may lack accuracy for complex simulations.
  • A more robust theoretical framework is needed for precise evaluation of plasmonic biosensors.

Purpose of the Study:

  • To adapt a reformulated Fast Fourier Transform Beam Propagation Method (FFT-BPM) for theoretical assessment of surface plasmonic waveguide biosensors.
  • To provide a more accurate and reliable simulation framework compared to the plane wave approximation.
  • To evaluate the performance characteristics of the proposed biosensor design.

Main Methods:

Keywords:
BiosensorFull width at half maximum (FWHM)Plasmonic waveguideTransfer matrix method (TMM)Waveguides

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  • Excitation of surface plasmon mode using a sub-wavelength narrow light beam.
  • Utilizing the highly confined optical energy of the plasmonic mode for sensitive detection of analyte composition variations.
  • Electronic detection of plasmonic guided power via an optical MOS capacitor.

Main Results:

  • The guided plasmonic power was used to assess sensor performance.
  • Key characteristics evaluated include linearity, sensitivity, figure of merit, and full width at half maximum (FWHM).

Conclusions:

  • The proposed sensor offers integration with angular measurement systems (e.g., goniometers) or electronic detection.
  • This work is valuable for researchers and developers of sensitive biosensors, particularly when complex analysis tools are undesirable.