Evolution of Airy beams in a mixed carbon nanotube medium
Natalia N. Yanyushkina; Volgograd State University
Abstract
This work investigates the propagation dynamics of ultrashort optical Airy and tri-Airy pulses in a medium composed of a mixed array of carbon nanotubes. The relevance of this study stems from the search for regimes of stable light-pulse propagation in nonlinear media, which is crucial for the development of information processing devices and the component base of optoelectronics.
Within the framework of numerical modeling, we solve the evolution problem for the vector potential of the electric field of the pulse, taking into account the nonlinear properties of the medium, which is a combined array of zigzag and armchair carbon nanotubes. Considering such a mixed environment is important because in synthesized structures it is impossible to obtain 100% pure arrays consisting of nanotubes of a single chirality. The initial pulse profile is specified by an Airy or tri Airy function. Notably, the first type of beams possesses the ability to propagate with virtually no diffraction or dispersion broadening, as well as the property of self healing after passing obstacles. Tri Airy beams represent a more complex class of light fields formed by the superposition of three deformed two dimensional Airy beams. Their key feature is pronounced autofocusing, i.e., upon propagation they sharply concentrate their energy in a small region.
The key result of this work is the demonstration of stable diffraction free propagation of Airy pulses in such a medium. It is shown that, despite the presence of dispersive and diffractive broadening, these effects are effectively compensated by the nonlinearity introduced by the nanotube array. As a result, the pulse keeps its energy localized within a limited spatial region. The obtained results indicate the promise of using carbon nanotube arrays as a controllable medium for the generation and transmission of ultrashort optical Airy pulses.
Speaker
Natalia Yanyushkina
Volgograd State University
Россия
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