Electrodynamical properties of Cross-Stacked Carbon Nanotube Networks

Abstract

We analyse the electromagnetic properties of Cross-Stacked Carbon Nanotube Networks
(CSCNNs) that consist of metallic and semiconducting single-wall carbon nanotubes (CNTs). These networks form a three-dimensional periodic lattice with the CNTs arranged in a single plane. The spacing between the CNTs is determined by the Van-der-Waals forces, which are calculated separately for metallic and semiconducting carbon nanotubes. We also examined CSCNNs with greater horizontal distances between CNTs. To determine the effective permittivity of these CSCNNs, we utilized the loaded wires theory. The CNT model we used is based on the $\pi$-electron approximation, which considers intraband and interband transitions and applies to both metallic and semiconducting CNTs.
The calculation of inductive, capacitive, and resistive loads of wires includes the electromagnetic and kinetic inductances of CNTs, which are regarded as wires with intricate surface impedances, along with the quantum and electrostatic capacitances of CNTs. Our study focused on the transmission of terahertz and mid-infrared radiation through CSCNNs that have multiple CNT layers. We computed the transmission, reflection, and absorption coefficients relative to frequency and incidence angle. Additionally, we examined the eigenmode spectrum in a finite-thickness layer of CSCNN and discovered that these modes have low dispersion.
The obtained results enable the selection of a suitable type of carbon nanotube and its arrangement to achieve the best possible performance for terahertz field-emitting structures.

Speaker

Igor Nefedov
Saratov State University
Russia

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