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Medium dependent optical response in ultra-fine plasmonic nanoparticles.

Lasse K Sørensen1,2,3, Daniil E Khrennikov4, Valeriy S Gerasimov4,5

  • 1Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden. lasse.kragh.soerensen@gmail.com.

Physical Chemistry Chemical Physics : PCCP
|September 29, 2022
PubMed
Summary

We investigated how media affects ultra-fine plasmonic nanoparticles (≤ 8 nm) and radiation. A distinct surface layer significantly influences their optical properties, especially in different surrounding media.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Optics

Background:

  • Ultra-fine plasmonic nanoparticles exhibit unique optical properties influenced by their surface.
  • The interaction of nanoparticles with radiation is crucial for various applications.
  • Understanding the role of the nanoparticle surface layer is key to controlling their behavior.

Purpose of the Study:

  • To investigate the influence of the surrounding medium on ultra-fine plasmonic nanoparticles (≤ 8 nm) and their interaction with radiation.
  • To elucidate the role of the nanoparticle surface layer in determining optical properties.
  • To explore the relationship between electric field distribution and nanoparticle characteristics.

Main Methods:

  • Atomistic modeling of nanoparticle material and light interaction.
  • Simulation of electric field distribution within and around nanoparticles.
  • Analysis of plasmon resonance shifts and refractive index sensitivity.

Main Results:

  • A distinct surface layer with different properties from the inner core was identified.
  • An inhomogeneous electric field distribution was observed inside and around the nanoparticles.
  • Increased ambient refractive index led to an extended surface layer, red-shifted plasmon resonance, and enhanced local fields.
  • Refractive index sensitivity decreases with size in the ultra-fine regime, contrary to larger particles.

Conclusions:

  • The surface layer plays a critical role in the optical properties of ultra-fine plasmonic nanoparticles.
  • Anisotropy in the local atomic environment drives the formation and properties of the surface layer.
  • The findings highlight the strong correlation between electric field distribution and the behavior of ultra-fine nanoparticles, offering insights for material design and sensing applications.