Abstract
AbstractPlasmonic excitation in atomic‐level one‐dimensional (1D) structure is characterized by use of electron diffraction and electron scattering spectroscopy with highly collimated slow electron beam. The high momentum resolution of the technique unveils the presence of steeply dispersing plasmon dispersion of the atom chains in the infrared region that is usually smeared out as broad feature near the Bragg beams. Two different Au and In chain structures on stepped silicon surfaces are measured to show plasmon dispersion only along the chains, which indicates strong plasmon confinement in each chain. On the other hand, different slope of the plasmon dispersion are found, which is due to the difference in their 1D electronic band and chain width. Copyright © 2008 John Wiley & Sons, Ltd.
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