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Related Experiment Videos

Bandgap-assisted surface-plasmon sensing.

Arnaud J Benahmed1, Chih-Ming Ho

  • 1Department of Mechanical Engineering, University of California, Los Angeles, CA 90095, USA. arnaud@seas.ucla.edu

Applied Optics
|May 22, 2007
PubMed
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Surface-plasmon resonance (SPR) sensors achieve greater sensitivity and reliability by utilizing a bandgap-assisted configuration. This method minimizes performance dependency on excitation beam divergence, outperforming traditional SPR for broader applications.

Area of Science:

  • Photonics and Plasmonics
  • Optical Sensing Technologies
  • Nanoscale Material Characterization

Background:

  • Surface-plasmon resonance (SPR) is a label-free sensing technique crucial for biomolecular interaction analysis.
  • Traditional SPR sensitivity is limited by the divergence angle of the excitation beam, especially with low-cost light sources like LEDs.
  • Compact SPR systems face challenges in maintaining high sensitivity due to beam divergence.

Purpose of the Study:

  • To investigate a novel SPR bandgap-assisted sensor design to overcome limitations of traditional SPR.
  • To evaluate the performance of the bandgap-assisted SPR sensor concerning excitation beam divergence.
  • To compare the efficacy of bandgap-assisted SPR with the conventional Kretschmann configuration.

Main Methods:

Related Experiment Videos

  • Utilized rigorous coupled-wave analysis (RCWA) for numerical simulations.
  • Investigated periodically modulated surfaces to create a surface-plasmon bandgap.
  • Analyzed amplitude-based SPR sensor performance with bandgap structures.

    • Main Results:

    • The bandgap-assisted SPR sensor demonstrated near-independence of sensitivity, detection limit, and minimum reflectivity from excitation beam divergence.
    • The high density of modes at the bandgap edge facilitated broader photon coupling to surface-plasmon polaritons.
    • Bandgap-assisted SPR outperformed traditional SPR when excitation beam angular standard deviation exceeded 1 degree.

    Conclusions:

    • SPR bandgap-assisted sensing offers enhanced robustness against excitation beam divergence.
    • This technique improves the performance of SPR sensors, particularly in compact systems using low-cost light sources.
    • The findings suggest a significant advancement for label-free sensing applications requiring high sensitivity and reliability.