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Related Experiment Videos

Surface plasmon resonance: theoretical evolutionary design optimization for a model analyte sensitive absorbing-layer

James M Rooney1, Elizabeth A H Hall

  • 1Institute of Biotechnology, University of Cambridge, Tennis Court Road, Cambridge CB2 1QT, UK.

Analytical Chemistry
|December 2, 2004
PubMed
Summary
This summary is machine-generated.

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Surface plasmon resonance (SPR) is evaluated for absorbing overlayers. Thinner gold layers or gold-free solutions offer enhanced contrast and tolerance for nitrogen dioxide detection.

Area of Science:

  • Optical physics
  • Materials science
  • Chemical sensing

Background:

  • Surface plasmon resonance (SPR) in Kretschmann configuration is standard for optical thickness monitoring.
  • Optimization for protein layers is common, but less so for absorbing overlayers.
  • The suitability of SPR for absorbing overlayers, especially those absorbing incident light, requires investigation.

Purpose of the Study:

  • To assess if surface plasmon resonance (SPR) is the optimal attenuated total reflectivity format for absorbing overlayers.
  • To explore alternative configurations and materials for enhanced SPR sensing.
  • To improve the performance of SPR for detecting analytes like nitrogen dioxide.

Main Methods:

  • Utilized experimental SPR data from copper phthalocyanine films exposed to nitrogen dioxide.

Related Experiment Videos

  • Employed an evolutionary algorithm for a design process based on experimental data.
  • Investigated thinner gold layers, gold-free solutions, and multilayer designs with low refractive index materials.

    • Main Results:

    • Thinner gold layers (approx. 25 nm) showed a 42.9% contrast enhancement over thicker layers (approx. 50 nm).
    • Gold-free solutions utilizing a low refractive index layer (Teflon AF 1600, n≈1.3) were predicted as viable alternatives.
    • The evolutionary algorithm suggested designs with improved nitrogen dioxide response and tolerance to incident angle variations.

    Conclusions:

    • SPR can be optimized for absorbing overlayers through material and layer thickness adjustments.
    • Gold-free or reduced-gold SPR systems offer promising alternatives for enhanced sensitivity and robustness.
    • The evolutionary design approach facilitates the optimization of SPR configurations for specific sensing applications.