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Multipolar surface plasmon peaks on gold nanotriangles.

N Félidj¹, J Grand, G Laurent

¹Laboratoire ITODYS, Université Paris 7-Denis Diderot, CNRS UMR 7086, F-75005 Paris, France. felidj@paris7.jussieu.fr

The Journal of Chemical Physics

|March 12, 2008

Summary

Researchers observed multipolar surface plasmon excitation in gold nanotriangles using microspectroscopy. These findings reveal new spectral features in the visible and near-infrared range, promising for nanooptics and sensing applications.

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Area of Science:

* Plasmonics and Nanophotonics
* Optical Spectroscopy

Background:

* Surface plasmon resonance (SPR) in metallic nanoparticles is sensitive to their size, shape, and surrounding environment.
* Understanding multipolar plasmon excitations is crucial for advancing nanoscale optical phenomena.

Purpose of the Study:

* To investigate and characterize multipolar surface plasmon excitation in lithographically fabricated gold nanotriangles.
* To explore the relationship between nanotriangle dimensions and observed plasmonic bands.
* To demonstrate the potential of these phenomena for advanced applications.

Main Methods:

* Far-field extinction microspectroscopy was employed to analyze gold nanotriangles across the 400–1000 nm wavelength range.
* Discrete dipole approximation (DDA) calculations were performed to support experimental observations and mode assignments.

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Main Results:

* Observation of distinct spectral bands corresponding to multipolar surface plasmon excitations in gold nanotriangles.
* Correlation between increasing triangle side length and the emergence of multiple plasmonic bands in the visible and near-infrared spectra.
* Clear resolution of the lowest three multipolar excitations.

Conclusions:

* The study successfully demonstrates the excitation and characterization of multipolar plasmon modes in gold nanotriangles.
* The observed spectral features offer new possibilities for tailoring optical properties at the nanoscale.
* These findings hold significant promise for applications in nanooptics, chemosensing, and biosensing.