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Angular Goos-Hänchen Shift Sensor Using a Gold Film Enhanced by Surface Plasmon Resonance.

Cherrie May Olaya1,2, Norihiko Hayazawa1,2, Nathaniel Hermosa1

  • 1National Institute of Physics, University of the Philippines, Quezon City 1101, Philippines.

The Journal of Physical Chemistry. A
|December 22, 2020
PubMed
Summary
This summary is machine-generated.

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This study enhances the angular Goos-Hänchen (GH) shift using surface plasmon resonance (SPR) with a focused beam. This technique shows potential for sensitive environmental monitoring applications.

Area of Science:

  • Optics
  • Nanotechnology
  • Sensing

Background:

  • The Goos-Hänchen (GH) shift describes the spatial or angular displacement of a reflected light beam at an interface.
  • Surface plasmon resonance (SPR) is a phenomenon sensitive to changes at a metal-dielectric interface, often used for sensing.

Purpose of the Study:

  • To demonstrate and enhance the angular GH shift using SPR.
  • To investigate the effect of a focused incident beam on SPR-enhanced GH shift.
  • To explore the potential of this enhanced angular GH shift for sensing applications.

Main Methods:

  • Utilized a Kretschmann configuration with a gold (Au) film on a substrate to excite surface plasmons.
  • Employed a focused incident beam to induce an enhanced angular GH shift (Θ).

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  • Simultaneously measured reflectivity for SPR and beam shift for GH shift.

    • Main Results:

    • Achieved a significantly large enhancement in the angular GH shift (Θ) using a focused beam, despite a decrease in spatial GH shift (Δ).
    • Demonstrated that focused geometry, while reducing SPR excitation efficiency, still induces a substantial Θ.
    • Showcased the potential for sensing applications by measuring enhanced Θ in response to local environmental changes.

    Conclusions:

    • Focused beam SPR configuration effectively enhances the angular GH shift.
    • The enhanced angular GH shift is a promising parameter for developing sensitive optical sensors.
    • This method offers a viable approach for detecting local environmental changes using simple thin-film structures.