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IP-Dip-Based SPR Structure for Refractive Index Sensing of Liquid Analytes.

Petra Urbancova1, Dusan Pudis1, Matej Goraus1

  • 1Department of Physics, Faculty of Electrical Engineering and Information Technology, University of Zilina, Univerzitna 1, 01026 Zilina, Slovakia.

Nanomaterials (Basel, Switzerland)
|May 5, 2021
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Summary

We developed a novel two-dimensional surface plasmon resonance structure for precise refractive index sensing of liquids. This polymer-based sensor achieved high sensitivity for detecting alcohol concentrations in water.

Keywords:
2D grating structurerefractive index sensingsurface plasmon resonance

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Area of Science:

  • Nanotechnology
  • Optical Sensors
  • Materials Science

Background:

  • Surface Plasmon Resonance (SPR) is a label-free optical sensing technique.
  • SPR sensors are widely used for detecting changes in refractive index.
  • Developing novel SPR structures can enhance sensor performance.

Purpose of the Study:

  • To present a novel two-dimensional (2D) surface plasmon resonance (SPR) structure.
  • To utilize the 2D SPR structure for refractive index sensing of liquid analytes.
  • To investigate the sensing capabilities of the fabricated SPR structure.

Main Methods:

  • A 2D polymer structure with a 500 nm period was fabricated using direct laser writing (DLW) with two-photon absorption (TPA) in IP-Dip polymer.
  • The polymer structure was coated with a 40 nm thin gold layer.
  • The sensing performance was evaluated by angular measurements using varying concentrations of isopropyl alcohol in deionized water.

Main Results:

  • The fabricated 2D SPR structure demonstrated effective refractive index sensing.
  • A sensitivity of 478-617 nm per refractive index unit (RIU) was achieved.
  • Optimal performance was observed at an external angle of incidence of 20°.

Conclusions:

  • The developed 2D SPR structure is a promising platform for liquid analyte sensing.
  • The fabrication method using DLW and IP-Dip polymer is suitable for creating such sensing structures.
  • The achieved sensitivity highlights the potential for practical applications in chemical and biological sensing.