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The propagation of azimuthally symmetric guided waves in multiwalled carbonnanotubes (MWCNTs) was analyzed theoretically in the mid-infrared and thevisible regimes. The MWCNTs were modeled as ensembles of concentric,cylindrical, conducting shells. Slightly attenuated guided waves and antennaresonances due to the edge effect exist for not-too-thick MWCNTs in the far-and mid-infrared regimes. Interband transitions hinder the propagation ofguided waves and have a deleterious effect on the performance of afinite-length MWCNT as an antenna. Propagation of surface-plasmon waves alongan MWCNT with a gold core was also analyzed. In the near-infrared and thevisible regimes, the shells behave effectively as lossy dielectrics suppressingsurface-plasmon-wave propagation along the gold core.

Analysis of Multiwalled Carbon Nanotubes as Waveguides and Antennas in the Infrared and the Visible Regimes