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Highly Sensitive Plasmonic Structures Utilizing a Silicon Dioxide Overlayer.

Jakub Chylek1, Petra Maniakova2, Petr Hlubina1

  • 1Department of Physics, Technical University Ostrava, 17. Listopadu 2172/15, 708 00 Ostrava-Poruba, Czech Republic.

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|September 23, 2022
PubMed
Summary
This summary is machine-generated.

This study presents a highly sensitive plasmonic sensor for liquid analyte detection. A thicker silicon dioxide overlayer significantly enhances sensitivity and the figure of merit (FOM).

Keywords:
Kretschmann configurationaqueous analyte sensingreflectancesilicon dioxide overlayersurface plasmon resonance

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Area of Science:

  • Plasmonics
  • Nanotechnology
  • Chemical Sensing

Background:

  • Plasmonic sensors offer high sensitivity for detecting analytes.
  • Optimizing protective overlayers is crucial for enhancing sensor performance and durability.

Purpose of the Study:

  • To theoretically and experimentally analyze simple, highly sensitive plasmonic structures for liquid analyte sensing.
  • To investigate the impact of silicon dioxide overlayer thickness on sensor sensitivity and figure of merit (FOM).

Main Methods:

  • Fabrication of plasmonic structures on a glass substrate with gold, chromium, and silicon dioxide layers.
  • Wavelength interrogation method and Kretschmann configuration with a BK7 prism for spectral reflectance measurements.
  • Spectral ellipsometry for determining layer thicknesses.

Main Results:

  • A pronounced dip in spectral reflectance was observed, red-shifting with increased analyte refractive index (RI).
  • A sensitivity of 15,785 nm/RIU and FOM of 37.9 RIU⁻¹ were achieved with a 147.5 nm silicon dioxide overlayer.
  • Theoretical and experimental results confirmed that a thicker silicon dioxide overlayer enhances both sensitivity and FOM.

Conclusions:

  • The plasmonic structures demonstrate enhanced sensitivity and FOM with increased silicon dioxide overlayer thickness.
  • The durable design ensures measurement repeatability and offers advantages over conventional aqueous analyte sensing structures.