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Molecular Monolayer Sensing Using Surface Plasmon Resonance and Angular Goos-Hänchen Shift.

Cherrie May Olaya1,2, Norihiko Hayazawa1,2, Maria Vanessa Balois-Oguchi2

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

Sensors (Basel, Switzerland)
|July 20, 2021
PubMed
Summary

This study shows how surface plasmon resonance (SPR) and angular Goos-Hänchen (GH) shift can detect molecular monolayers. Benzenethiol self-assembled monolayers (BT-SAM) on gold substrates offer a hydrophobic surface, minimizing contamination for accurate sensing.

Keywords:
fresnelgoos-hänchen shiftplasmonself-assembled monolayersurface plasmon resonance

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Area of Science:

  • Surface science
  • Nanotechnology
  • Optical physics

Background:

  • Surface plasmon resonance (SPR) and angular Goos-Hänchen (GH) shift are sensitive optical techniques.
  • Molecular monolayers, such as benzenethiol self-assembled monolayers (BT-SAM) on gold (Au) substrates, are crucial in various applications.
  • Surface contamination can significantly affect optical measurements.

Purpose of the Study:

  • To demonstrate the potential of SPR and GH shift for detecting molecular monolayers.
  • To investigate the role of surface properties, specifically hydrophobicity, in molecular monolayer sensing.
  • To analyze the impact of surface modification on SPR angle measurements.

Main Methods:

  • Utilizing surface plasmon resonance (SPR) measurements.
  • Employing angular Goos-Hänchen (GH) shift measurements, focusing on the angular component.
  • Creating benzenethiol self-assembled monolayers (BT-SAM) on gold (Au) substrates for surface modification.

Main Results:

  • Excitation of surface plasmons significantly enhanced the GH shift.
  • The hydrophobic nature of BT-SAM on Au reduced surface contamination compared to a clean Au surface.
  • A smaller SPR angle was observed for BT-SAM coated Au substrates, indicating successful surface modification and reduced contamination.

Conclusions:

  • SPR and GH shift measurements show potential for molecular monolayer detection.
  • Surface modification with BT-SAM enhances sensing capabilities by minimizing contamination.
  • The study highlights the importance of surface properties in achieving accurate optical sensing.