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High-resolution surface plasmon resonance sensor based on linewidth-optimized nanohole array transmittance.

Kevin A Tetz1, Lin Pang, Yeshaiahu Fainman

  • 1Department of Electrical and Computer Engineering, University of California, San Diego 92093, USA. ktetz@ucsd.edu

Optics Letters
|April 28, 2006
PubMed
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We developed a novel nanohole-array surface plasmon resonance sensor for high-resolution imaging. This sensor achieves high refractive index sensitivity, enabling precise detection of minute changes.

Area of Science:

  • Optics and Photonics
  • Nanotechnology
  • Sensors and Sensing

Background:

  • Surface plasmon resonance (SPR) sensors are crucial for label-free biosensing.
  • Traditional SPR sensors often face limitations in resolution and imaging capabilities.
  • Nanohole arrays offer unique plasmonic properties for sensor development.

Purpose of the Study:

  • To present a high spectral resolution, 2D nanohole-array SPR sensor.
  • To demonstrate enhanced sensor resolution through tailored spectral line shapes.
  • To facilitate high spatial resolution imaging at normal incidence.

Main Methods:

  • Fabrication of a 2D nanohole-array structure.
  • Utilizing a polarizer-analyzer pair to modify transmittance.

Related Experiment Videos

  • Analyzing angular and spectral transmittance to observe Fano-to-Lorentzian line shape conversion.
  • Characterizing sensor performance by measuring refractive index sensitivity.

    • Main Results:

    • The sensor operates effectively at normal or near-normal incidence, enabling high spatial resolution imaging.
    • Modification of the spectral transmittance from Fano to Lorentzian line shape was achieved.
    • Linewidth narrowing resulted in maximized sensor resolution.
    • Achieved a demonstrated resolution of the order of 10⁻⁵ refractive index units (RIU).

    Conclusions:

    • The developed nanohole-array SPR sensor offers significantly improved resolution.
    • The system shows potential for achieving resolutions of the order of 10⁻⁶ RIU under optimal conditions.
    • This technology advances the capabilities of SPR sensing for high-precision measurements.