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首页> 外文期刊>Physical review >Electromagnetic wave propagation in an almost circular bundle of closely packed metallic carbon nanotubes
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Electromagnetic wave propagation in an almost circular bundle of closely packed metallic carbon nanotubes

机译：电磁波在紧密堆积的金属碳纳米管的几乎圆形束中的传播

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摘要

An equivalent-multishell approach for the approximate calculation of the characteristics of electromagnetic waves propagating in almost circular (azimuthally symmetric), closely packed bundles of parallel, identical, and metallic carbon nanotubes (CNTs) yields results in reasonably good agreement with a many-body technique, for infinitely long bundles when the number of CNTs is moderately high. The slow-wave coefficients for azimuthally symmetric guided waves increase with the number of metallic CNTs in the bundle, tending for thick bundles to unity, which is characteristic of macroscopic metallic wires. The existence of an azimuthally nonsymmetric guided wave at low frequencies in a bundle of a large number of finite-length CNTs stands in contrast to the characteristics of guided-wave propagation in a single CNT. The equivalent-multishell approach yields the polarizability scalar and the antenna efficiency of a bundle of finite-length CNTs in the long-wavelength regime over a 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 that of a single CNT by 4 orders of magnitude, which is promising for the design and development of CNT-bundle antennas and composite materials containing CNT bundles as inclusions.
机译：一种近似多壳方法，用于近似计算在几乎圆形（方位角对称），紧密堆积的平行，相同和金属碳纳米管（CNT）束中传播的电磁波的特性，从而可以与多体合理地很好地吻合碳纳米管的数量适中时，对于无限长的束来说，这种技术是可行的。方位对称导波的慢波系数随线束中金属CNT的数量增加而增加，使粗线束趋于统一，这是宏观金属线的特征。与单个CNT中的导波传播特性相反，大量有限长度的CNT束中存在低频的方位角非对称导波。等效多壳方法在跨越太赫兹和近红外范围的宽频率范围内，在长波长范围内产生了一束有限长度的CNT的极化率标量和天线效率。边缘效应在这种束中引起几何共振。第一次共振时，CNT束的天线效率可以比单个CNT高4个数量级，这对于CNT束天线和包含CNT束作为内含物的复合材料的设计和开发是有前途的。

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