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Influence of Random Plasmonic Metasurfaces on Fluorescence Enhancement.

Veronica Anăstăsoaie1, Roxana Tomescu1, Cristian Kusko1

  • 1National Institute for Research and Development in Microtechnologies-IMT Bucharest, 126A, Erou Iancu Nicolae Street, 077190 Voluntari, Romania.

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Summary
This summary is machine-generated.

Random metal nanoparticle aggregates on substrates significantly enhance fluorescence. This offers a low-cost, scalable platform for sensitive fluorescent biosensors, overcoming limitations of engineered metasurfaces.

Keywords:
fluorescencefluorescence enhancementlocalized field enhancementnanophononicsplasmonic metasurface

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Area of Science:

  • Plasmonics
  • Nanotechnology
  • Biosensing

Background:

  • Plasmonic metasurfaces enhance fluorescence biosensors by controlling electromagnetic fields.
  • Engineered metasurfaces are costly and difficult to mass-produce.
  • Random metallic nanoparticle aggregates offer a potential alternative for fluorescence enhancement.

Purpose of the Study:

  • To investigate the use of random metal nanoparticle aggregates as a low-cost platform for fluorescence enhancement in biosensors.
  • To evaluate the fluorescence enhancement capabilities of these nanoparticle aggregates on silicon and glass substrates.

Main Methods:

  • Finite difference time domain (FDTD) simulations to model electromagnetic field enhancement.
  • Experimental investigation using Rhodamine 6G dye dispersed in polymethylmethacrylate (PMMA).
  • Fabrication of metasurfaces using random aggregates of metal nanoparticles on silicon and glass.

Main Results:

  • Simulations showed significant excitation field enhancement due to resonant plasmonic modes in nanoparticle aggregates.
  • Experimental results demonstrated a 423-fold fluorescence enhancement for Rhodamine 6G.
  • Nanoparticle aggregates effectively enhance fluorescence compared to engineered metasurfaces.

Conclusions:

  • Randomly distributed metal nanoparticle aggregates are a viable, low-cost alternative to engineered metasurfaces for fluorescence enhancement.
  • This approach holds significant potential for the mass production of sensitive fluorescent biosensors.
  • The findings pave the way for more accessible and affordable biosensing technologies.