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Observation and Analysis of Blinking Surface-enhanced Raman Scattering
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Surface-enhanced Raman scattering from silver-coated opals.

Weiqiang Mu1, Dae-Kue Hwang, Robert P H Chang

  • 1Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208, USA. w-mu@northwestern.edu

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|April 5, 2011
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Surface-enhanced Raman scattering (SERS) on silver-coated artificial opals achieved large enhancement factors up to 10^7. Simulations helped explain the electric field enhancements at the opal surface.

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Area of Science:

  • Nanophotonics
  • Surface Science
  • Spectroscopy

Background:

  • Artificial opals, as 3D photonic crystals, offer unique optical properties.
  • Surface-enhanced Raman scattering (SERS) requires plasmonic nanostructures for signal amplification.
  • Combining opals with plasmonic films can create novel SERS substrates.

Purpose of the Study:

  • To investigate SERS performance of silver-coated artificial opals.
  • To explore the influence of sphere size, silver thickness, and laser wavelength on SERS.
  • To understand the underlying electromagnetic field enhancements.

Main Methods:

  • Fabrication of silver-coated artificial opals with varying parameters.
  • Performing SERS measurements using benzenethiol as a probe molecule.
  • Conducting finite-difference time-domain (FDTD) simulations of electric fields.

Main Results:

  • Achieved SERS enhancement factors as high as 10^7.
  • Observed significant influence of sphere size, silver thickness, and excitation wavelength.
  • Simulations correlated well with experimental observations of field localization.

Conclusions:

  • Silver-coated artificial opals are effective SERS substrates.
  • Optimizing structural parameters and laser wavelength is crucial for maximizing SERS enhancement.
  • FDTD simulations provide valuable insights into the plasmonic field enhancements.