ABSTRACT
Plasmons can be confined and propagated in ultimately thin media down to the scale of atomic sheets and atomic wires. This new class of plasmons exhibits resonance frequency in the infrared (IR) spectral region and shows extremely small phase velocity compared with conventional surface plasmons in larger systems. Recently, such atomic-scale slow plasmons are also found to support standing-wave plasmons similar to cases with thicker and longer nanoantennas prepared by electron beam lithography. In this chapter, dispersion relations of propagating plasmon modes and plasmonic standing-wave modes in some atomic-scale systems are briefly overviewed.
