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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and the...
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...

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Surface Enhanced Raman Spectroscopy Detection of Biomolecules Using EBL Fabricated Nanostructured Substrates
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Raman Scattering Enhancements Due to Super- and Subradiant Collective Plasmon Modes on Large-Area 2D-Au Arrays.

Ephraim T Mathew1,2, Andriy E Serebryannikov1, Jacek Jenczyk2

  • 1Faculty of Physics and Astronomy, Adam Mickiewicz University, Uniwersytetu Poznańskiego 2, 61-614 Poznań, Poland.

ACS Applied Materials & Interfaces
|May 22, 2025
PubMed
Summary

Ordered metal nanoparticle arrays with tiny gaps create strong electromagnetic hotspots for surface-enhanced Raman spectroscopy (SERS) sensing. Gap size, not ordering, primarily dictates SERS enhancement, crucial for designing effective SERS substrates.

Keywords:
SERS dichroismanisotropic plasmonic effectcollective plasmon modenonpercolated filmsperiodically corrugated sapphiresuper- and subradiant plasmon modes

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Area of Science:

  • Plasmonics and Nanophotonics
  • Surface-Enhanced Raman Spectroscopy (SERS)
  • Materials Science

Background:

  • Ordered metal nanoparticle (MNP) arrays with small interparticle gaps (S) generate intense electromagnetic (EM) near-field enhancements, known as hotspots.
  • These hotspots are critical for sensitive detection in surface-enhanced Raman spectroscopy (SERS).
  • Uniform gap sizes are essential for studying nonlinear Raman scattering and surface selection rules.

Purpose of the Study:

  • To investigate the role of interparticle gap distance (S) and MNP ordering in SERS enhancement.
  • To understand the excitation of hybridized-collective plasmon modes and their impact on EM near-field enhancement.
  • To explore the anisotropy-induced SERS dichroism effect and its dependence on excitation polarization and wavelength.

Main Methods:

  • Fabrication of large-area 2D gold (Au) nanoparticle arrays with ultrasmall interparticle gaps (S ≪ r, where r is MNP radius).
  • Optical characterization to analyze plasmon modes and EM near-field enhancement.
  • Polarization-dependent SERS measurements to study anisotropy and dichroism effects.

Main Results:

  • SERS enhancement is primarily governed by the interparticle gap distance (S), not the ordering of MNPs.
  • Ordered arrays influence far-field scattering of super-radiant modes, leading to anisotropic SERS enhancements dependent on excitation polarization angle (σ).
  • An anisotropy-induced SERS dichroism effect was observed, with polarization-dependent SERS intensities showing distinct dependencies (cos²(σ) or sin²(σ)) based on Stokes wavelength.

Conclusions:

  • The interparticle gap distance is the dominant factor for SERS enhancement in ordered MNP arrays.
  • Understanding the interplay between gap size and ordering is crucial for designing efficient SERS substrates with numerous, intense hotspots.
  • The observed SERS dichroism validates the EM near-field mechanism and highlights the potential for polarization-controlled SERS sensing.