Projects per year
Abstract
The plasmonic properties of individual subwavelength-sized silver nanocubes are mapped with nanometric spatial resolution by means of electron energy-loss spectroscopy in a scanning transmission electron microscope. Three main features with different energies and spatial behavior (two peaked at the corners, one on the edges) are identified and related to previous measurements on ensemble or individual nanoparticles. The highly subwavelength mapping of the energy position and intensity of the excitations shows that the surface plasmon modes, localized at specific areas of the particles, for example, the corners or the edges, are modified by their size, the presence of a substrate, and the very local environment. Helped by discrete dipole approximation numerical simulations, we discuss how local modifications of the environment affect the global modes of the particles. In particular, we show both experimentally and theoretically that absorption resonances at different corners of the same nanocube are largely independent of each other in energy and intensity. Our findings provide a better understanding of the spatial coherence of the surface plasmons in nanoparticles but also give useful insights about their roles in the nanoparticle sensing properties.
Original language | English |
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Pages (from-to) | 1288-1294 |
Number of pages | 7 |
Journal | Nano Letters |
Volume | 12 |
Issue number | 3 |
DOIs | |
Publication status | Published - 14 Mar 2012 |
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Projects
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Numerical simulation of the collective electronic excitation of metallic nanoparticules by an electronic beam
Henrard, L., GEUQUET, N. & SCHIEVEKAMP, I.
1/09/05 → 31/08/11
Project: PHD
Equipment
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High Performance Computing Technology Platform
Benoît Champagne (Manager)
Technological Platform High Performance ComputingFacility/equipment: Technological Platform
Activities
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Raoul ARENAL de la CONCHA
Luc Henrard (Host)
9 Dec 2013 → 13 Dec 2013Activity: Hosting a visitor types › Hosting an academic visitor
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Recent Advances in Spectromicroscopy: Experimental and Theoretical Tools
Luc Henrard (Speaker)
4 Sep 2013 → 6 Sep 2013Activity: Participating in or organising an event types › Participation in conference