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Related Concept Videos

Propagation of Waves01:07

Propagation of Waves

When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
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Attaching Biological Probes to Silica Optical Biosensors Using Silane Coupling Agents
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Comparison of Free-Space and Waveguide-Based SERS Platforms.

Nina Turk1,2, Ali Raza3,4, Pieter Wuytens5

  • 1Photonics Research Group, Department of Information Technology, Ghent University-IMEC, Technologiepark 126, 9052 Ghent, Belgium. nina.turk@ugent.be.

Nanomaterials (Basel, Switzerland)
|October 5, 2019
PubMed
Summary

This study compares gold nanodomes and waveguide-based nanoplasmonic slot waveguides for Surface-Enhanced Raman Spectroscopy (SERS). Waveguide platforms show comparable signal-to-background ratios to nanodomes and enable peptide detection for lab-on-a-chip applications.

Keywords:
Raman spectroscopySERSgold nanodomesnanoplasmonic slot waveguidepeptide detectionphotonic integrated circuitwaveguide-based SERS

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Area of Science:

  • Nanophotonics and Spectroscopy
  • Plasmonics and Nanomaterials

Background:

  • Surface-Enhanced Raman Spectroscopy (SERS) offers highly specific molecular detection by amplifying weak Raman signals using plasmonic nanostructures.
  • Gold nanodomes provide significant SERS enhancement in conventional free-space microscopy.
  • Nanophotonic waveguides present an alternative for efficient Raman signal excitation and collection.

Purpose of the Study:

  • To compare the SERS performance of gold nanodomes (free-space excitation/collection) with waveguide-based nanoplasmonic slot waveguides.
  • To evaluate signal enhancement and background noise for both SERS platforms.
  • To demonstrate the potential of waveguide-based SERS for detecting biologically relevant molecules.

Main Methods:

  • Utilized gold nanodomes and nanoplasmonic slot waveguides as SERS platforms.
  • Employed a monolayer of nitrothiophenol to assess SERS signal enhancement and background.
  • Investigated the detection of a peptide monolayer on the waveguide platform.

Main Results:

  • Nanoplasmonic slot waveguides achieved signal-to-background ratios comparable to gold nanodomes.
  • Demonstrated the first-time detection of a peptide monolayer using a waveguide-based SERS platform.
  • Validated the efficiency of waveguide-based SERS for sensitive molecular detection.

Conclusions:

  • Waveguide-based nanoplasmonic slot waveguides are a promising alternative to conventional SERS microscopy.
  • This technology facilitates reproducible SERS measurements and paves the way for integrated lab-on-a-chip devices.
  • Enables future monitoring of biologically relevant molecules with high specificity.