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Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle
Published on: January 3, 2016
Two-dimensional quasistatic stationary short range surface plasmons in flat nanoprisms
J Nelayah1, M Kociak, O Stéphan
1Laboratoire de Physique des Solides, Batiment 510, CNRS UMR 8502, Universite Paris Sud XI, F 91405 Orsay, France.
Nano Letters
|February 19, 2010
Summary
We visualized surface plasmons in silver nanoprisms using electron energy loss spectroscopy. Their energy and intensity depend on prism size, a finding useful for designing optical properties of metallic nanoplatelets.
Area of Science:
- Plasmonics
- Nanophotonics
- Materials Science
Background:
- Surface plasmons are collective electron oscillations on metal surfaces.
- Understanding plasmon behavior in nanostructures is crucial for optical applications.
- Silver nanoprisms offer unique plasmonic properties due to their shape.
Purpose of the Study:
- To investigate the spectral imaging of surface plasmons in individual silver triangular nanoprisms.
- To correlate plasmon energy and intensity with nanoprism geometry.
- To develop a model for predicting optical properties of metallic nanoplatelets.
Main Methods:
- Nanometer scale spectral imaging using electron energy loss spectroscopy (EELS).
- Computational modeling using discrete dipole approximation (DDA) simulations.
- Analysis of plasmon mode dependence on nanoprism edge length and aspect ratio.
Main Results:
- Identified a clear dependence of plasmon mode energy and intensity on nanoprism edge length, confirmed by EELS and DDA.
- Observed monotonic relationships between mode properties and aspect ratio for experimentally relevant sizes (70-300 nm).
- Simulations revealed deviations for shorter/longer prisms and explained mode behavior via coupled surface plasmons.
Conclusions:
- The study elucidates quasistatic short-range surface plasmons in silver nanoprisms.
- A continuum dielectric model successfully explains the observed and simulated changes in plasmon energy and intensity.
- The findings provide a unified understanding of surface plasmons in platelets, aiding in the engineering of optical properties for metallic nanoplatelets.
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