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An equivalent-multishell approach for the approximate calculation of thecharacteristics of electromagnetic waves propagating in almost circular(azimuthally symmetric), closely packed bundles of parallel, identical, andmetallic carbon nanotubes (CNTs) yields results in reasonably good agreementwith a many-body technique, for infinitely long bundles when the number of CNTsis moderately high. The slow-wave coefficients for azimunthally symmetricguided waves increase with the number of metallic CNTs in the bundle, tendingfor thick bundles to unity, which is characteristic of macroscopic metallicwires. The existence of an azimuthally nonsymmetric guided wave at lowfrequencies in a bundle of a large number of finite-length CNTs stands incontrast to the characteristics of guided-wave propagation in a single CNT. Theequivalent-multishell approach yields the polarizability scalar and the antennaefficiency of a bundle of finite-length CNTs in the long-wavelength regime overa wide frequency range spanning the terahertz and the near-infrared regimes.Edge effects give rise to geometric resonances in such bundles.  The antenna efficiency of a CNT bundle at the first resonance can exceed thatof a single CNT by four orders of magnitude, which is promising for the designand development of CNT-bundle antennas and composite materials containingCNT-bundles as inclusions.

Electromagnetic wave propagation in an almost circular bundle of closely packed, metallic, carbon nanotubes