Scattering of surface electromagnetic waves by Sn nanoparticles

Area of Science:

• Physics
• Materials Science
• Nanotechnology

Background:

• Surface plasmon-polaritons (SPPs) are crucial for light manipulation at the nanoscale.
• Scattering of SPPs by nanoparticles (NPs) is a key phenomenon in plasmonics.
• Understanding the relationship between NP size and scattered light is vital for optical sensor development.

Purpose of the Study:

• To numerically investigate the relationship between nanoparticle size and scattered light distribution.
• To explain the origin of observed maxima in angular scattering patterns.
• To assess the utility of scattered light polarization for analyzing multiple scattering effects.

Main Methods:

• Numerical simulations were employed to model SPP scattering by NPs.
• Analysis focused on the angular position of maxima in scattered light distributions.
• Polarization properties of scattered light were examined to quantify multiple scattering.

Main Results:

• Nanoparticle size directly correlates with the angular position of maximum scattered light.
• Bimodal NP size distributions explain the presence of one or two experimental maxima.
• Scattered light maxima are observable over a broader range of NP sizes than reflectivity minima.

Conclusions:

• The study provides a clear link between NP size distribution and observed scattering patterns.
• Scattered light maxima offer a robust indicator for SPP excitation, even with varying NP sizes or surface roughness.
• These findings are significant for advancing the design and application of SPP-based optical sensors.