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Surface plasmon damping quantified with an electron nanoprobe.

Michel Bosman¹, Enyi Ye, Shu Fen Tan

¹Institute of Materials Research and Engineering, A*STAR-Agency for Science, Technology and Research, 3 Research Link, Singapore 117602. michel.bosman@gmail.com

Scientific Reports

|February 22, 2013

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Quantitative electron energy-loss spectroscopy (EELS) now probes plasmon damping in single gold nanostructures. This technique reveals plasmon quality factors and dephasing times across various nanoparticle shapes.

Area of Science:

Plasmonics and Nanophotonics
Materials Science
Spectroscopy

Background:

Advancements in fabricating plasmonic structures enable sub-nanometer control over shape and inter-particle distance.
This precision promises novel device components leveraging non-classical electro-optical effects.
Monochromatized electron energy-loss spectroscopy (EELS) offers high spatial resolution for nano-optics and plasmonics.

Purpose of the Study:

To demonstrate the quantitative application of EELS for probing surface plasmon kinetics and damping in individual nanostructures.
To measure plasmon Quality factors and dephasing times as a function of energy/frequency in gold nanoparticles.
To establish EELS as a quantitative tool for nanoplasmonics research.

Main Methods:

Utilizing monochromatized electron energy-loss spectroscopy (EELS) with sub-nanometer spatial resolution.

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Analyzing a series of over 50 individual gold nanoparticles, including regular (spheres, rods) and irregular (dendritic, branched) morphologies.

Correlating EELS data with direct sub-nanometer imaging.

Main Results:

EELS was successfully employed quantitatively to determine plasmon Quality factors and plasmon Dephasing times in single gold nanostructures.
The study presents trends in plasmon kinetics and damping across diverse nanoparticle shapes.
A general trend was observed for both regular and irregular particle morphologies.

Conclusions:

EELS can be quantitatively applied to study surface plasmon kinetics and damping in single nanostructures.
This quantitative EELS approach provides insights into plasmon behavior across different nanoparticle geometries.
The integration of sub-nanometer imaging with EELS-based damping analysis advances quantitative nanoplasmonics into the sub-nanometer regime.