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Electrotunable Nanoplasmonics for Amplified Surface Enhanced Raman Spectroscopy.

Ye Ma1,2, Debabrata Sikdar1,3, Aleksandra Fedosyuk1

  • 1Department of Chemistry , Imperial College London , Molecular Sciences Research Hub, White City Campus , London W12 0BZ , U.K.

ACS Nano
|December 7, 2019
PubMed
Summary

Real-time tuning of optical metamaterials is achieved by electrovariable nanoparticle assembly. This enables adaptive photonic materials with tunable optical reflectivity and amplified SERS signals through electrochemical nanoplasmonics.

Keywords:
electrotunablemetasurfacenanoparticlesplasmonicsself-assemblysurface enhanced Raman spectroscopy

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Area of Science:

  • Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Tuning optical metamaterial properties in real-time is a significant challenge.
  • Adaptive photonic materials are crucial for applications like SERS and tunable reflectors/absorbers.

Purpose of the Study:

  • To demonstrate real-time tuning of optical metamaterials.
  • To explore electrovariable self-assembly of nanoparticle arrays for adaptive photonics.

Main Methods:

  • Utilized voltage-controlled assembly of gold nanoparticle arrays at a TiN/Ag electrode interface.
  • Investigated plasmonic coupling between nanoparticles and the metal surface.

Main Results:

  • Achieved reversible control over nanoparticle array density via electrode potential variation.
  • Demonstrated a dramatic optical reflectivity change (93% to 1%) with <1 V potential change.
  • Showcased SERS signal amplification by up to 5 orders of magnitude.

Conclusions:

  • Electrochemical nanoplasmonics offers a promising route for adaptive photonic materials.
  • Experimental results align with theoretical predictions for collective plasmon-coupling effects.