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Outstanding surface plasmon resonance performance enabled by templated oxide gratings.

Baeck Choi1, Xuan Dou1, Yin Fang1

  • 1Department of Chemical Engineering, University of Florida, Gainesville, FL 32611, USA. pjiang@che.ufl.edu.

Physical Chemistry Chemical Physics : PCCP
|October 7, 2016
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Summary

Researchers developed a novel templating method using DVDs to create gold-covered oxide gratings. These plasmonic gratings show high surface plasmon resonance (SPR) sensitivity and figure of merit (FOM), ideal for advanced sensing applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Plasmonics

Background:

  • Surface Plasmon Resonance (SPR) is a powerful optical sensing technique.
  • Developing cost-effective and high-performance SPR substrates is crucial for widespread application.
  • Existing fabrication methods can be complex and expensive.

Purpose of the Study:

  • To develop a simple, scalable, and cost-effective method for fabricating plasmonic gratings.
  • To investigate the impact of thermal annealing on the plasmonic properties of these gratings.
  • To evaluate the potential of these gratings for sensing applications.

Main Methods:

  • Soft-lithography-based templating using discarded DVDs.
  • Fabrication of gold-covered titania and zirconia gratings.
  • Systematic investigation using experimental techniques (SEM, XRD) and finite-difference time-domain (FDTD) simulations.
  • Analysis of surface plasmon resonance (SPR) sensitivity and figure of merit (FOM).

Main Results:

  • Achieved high SPR sensitivity (up to ~940 nm/RIU) and FOM (up to 62.5).
  • Thermal annealing increased SPR sensitivity but slightly decreased FOM.
  • Annealing led to larger oxide crystal domains and smoother surfaces, affecting SPR properties.
  • FDTD simulations confirmed the influence of structural deformation on SPR characteristics.

Conclusions:

  • The DVD-templated plasmonic gratings offer excellent SPR performance.
  • Thermal annealing can tune SPR properties, with trade-offs in sensitivity and FOM.
  • The high performance and thermal stability make these gratings promising for sensing, including in situ catalysis monitoring.