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Guided mode biosensor based on grating coupled porous silicon waveguide.

Xing Wei1, Sharon M Weiss

  • 1Department of Electrical Engineering and Computer Science, Vanderbilt University, Nashville, Tennessee 37235, USA.

Optics Express
|July 1, 2011
PubMed
Summary
This summary is machine-generated.

Porous silicon waveguide biosensors with integrated grating couplers enhance molecular detection. This novel design improves optical field interaction for sensitive nucleic acid hybridization detection.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biophotonics

Background:

  • Biosensors are crucial for molecular detection.
  • Porous silicon offers unique optical and physical properties.
  • Grating couplers can enhance light-matter interaction in waveguides.

Purpose of the Study:

  • To demonstrate porous silicon waveguide biosensors utilizing grating couplers for improved molecular detection.
  • To investigate the sensitivity and selectivity of these biosensors for nucleic acid hybridization.
  • To compare the performance with traditional evanescent wave-based biosensors.

Main Methods:

  • Fabrication of porous silicon waveguides with integrated grating couplers.
  • Infiltration of molecules into the waveguide through grating couplers.
  • Detection of nucleic acid hybridization via angle-resolved reflectance measurements.
  • Rigorous coupled wave analysis for theoretical validation.

Main Results:

  • Demonstrated improved molecular detection capabilities using porous silicon grating couplers.
  • Achieved a detection sensitivity of 7.3°/mM for nucleic acid hybridization.
  • Showcased selectivity better than 6:1 compared to mismatched sequences.
  • Experimental results aligned well with theoretical calculations.

Conclusions:

  • The all-porous silicon grating-coupled waveguide offers enhanced interaction between the optical field and surface-bound molecules.
  • This technology presents a promising platform for sensitive and selective biosensing applications.
  • The demonstrated biosensor design surpasses the performance of conventional evanescent wave-based sensors.