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Cavity-enhanced biosensing utilizing plasmon resonance modes.

D Razansky1, P D Einziger, D R Adam

  • 1Dept. of Biomed. Eng., Israel Inst. of Technol., Haifa, Israel. danir@tx.technion.ac.il

Conference Proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference
|October 20, 2007
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Cavity plasmon resonance (CPR) extends surface plasmon resonance (SPR) biosensing to below critical angles. CPR offers flexible, highly efficient, and sensitive biosensing for both TE and TM fields, even at normal incidence.

Area of Science:

  • Optoelectronics
  • Nanotechnology
  • Biosensing

Background:

  • Surface plasmon resonance (SPR) biosensors traditionally rely on light absorption above critical angles.
  • SPR requires specific conditions, limiting practical applications.
  • TM polarized light is typically required for SPR.

Purpose of the Study:

  • To introduce and explore cavity plasmon resonance (CPR) for biosensing.
  • To demonstrate CPR's advantages over traditional SPR.
  • To enable more flexible and efficient biosensor designs.

Main Methods:

  • Excitation of metallic films using CPR at incidence angles below the critical angle.
  • Implementation of CPR for both transverse electric (TE) and transverse magnetic (TM) fields.

Related Experiment Videos

  • Demonstration of CPR under normal incidence (TEM).

    • Main Results:

    • CPR allows excitation below the critical angle, unlike SPR.
    • CPR is compatible with both TE and TM polarizations.
    • CPR functions effectively even under normal incidence.

    Conclusions:

    • CPR offers a more flexible alternative to SPR for biosensor design.
    • CPR enables highly efficient and sensitive biosensing devices.
    • CPR overcomes limitations of traditional SPR excitation conditions.