Single particle plasmon spectroscopy of silver nanowires and gold nanorods

Moussa N'Gom, Jan Ringnalda, John F Mansfield, Ashish Agarwal, Nicholas Kotov, Nestor J Zaluzec, Theodore B Norris
Nano Letters 2008, 8 (10): 3200-4
The excitation of surface plasmons in individual silver nanowires and gold nanorods is investigated by means of high-resolution electron energy loss spectroscopy in a transmission electron microscope. The transverse and longitudinal modes of these nanostructures are resolved, and the size variation of the plasmon peaks is studied. The effect of electromagnetic coupling between closely spaced nanoparticles is also observed. Finally, the relation between energy-loss measurements and optical spectroscopy of nanoparticle plasmon modes is discussed.

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