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Updated: Jun 16, 2026

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
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Localized surface plasmons, surface plasmon polaritons, and their coupling in 2D metallic array for SERS.

Luping Du1, Xuejin Zhang, Ting Mei

  • 1Institute of Optoelectronic Materials and Technology, South China Normal University, Guangzhou 510631, China.

Optics Express
|February 23, 2010
PubMed
Summary

A novel substrate for surface-enhanced Raman spectroscopy (SERS) was developed. This easily fabricated dielectric grating with a silver film achieves significant Raman enhancement (2 x 10^9) through coupled plasmons.

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Area of Science:

  • Plasmonics
  • Nanophotonics
  • Spectroscopy

Background:

  • Surface-enhanced Raman spectroscopy (SERS) requires substrates with high sensitivity and uniform hotspots.
  • Existing SERS substrates face challenges in fabrication and achieving consistent enhancement.

Purpose of the Study:

  • To propose and simulate an easily fabricated substrate for SERS.
  • To investigate the plasmonic properties of a novel dielectric grating structure.
  • To achieve significant and uniform Raman signal enhancement.

Main Methods:

  • Fabrication of a two-dimensional dielectric grating.
  • Coating the grating with a thin silver film.
  • Finite-difference time-domain (FDTD) simulations to analyze plasmon excitation and near-field distribution.

Main Results:

  • The proposed substrate enables the excitation of both localized surface plasmons (LSPs) and surface plasmon polaritons (SPPs).
  • Simulations show strong coupling between LSPs and SPPs, leading to a high Raman enhancement factor of 2 x 10^9.
  • A highly regular hotspot pattern was observed in the near-field distribution, crucial for ideal SERS performance.

Conclusions:

  • The developed dielectric grating silver-film substrate offers a promising platform for highly sensitive SERS applications.
  • The substrate's design facilitates efficient coupling of plasmon modes for enhanced Raman signals.
  • The regular hotspot distribution ensures reproducibility and reliability in SERS measurements.