| Issue |
EPL
Volume 106, Number 3, May 2014
|
|
|---|---|---|
| Article Number | 37005 | |
| Number of page(s) | 5 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/106/37005 | |
| Published online | 09 May 2014 | |
Influence of multi-level impurities on the dynamics of ultrashort electromagnetic pulses in carbon nanotubes
1 Singapore University of Technology and Design - 138682 Singapore
2 Volgograd State University - 400062 Volgograd, Russia
3 Lab of Nanotechnology, Volgograd Institute of Business - 400048 Volgograd, Russia
4 Office of the Chancellor and Center for Nanoscience, Department of Chemistry & Biochemistry and Department of Physics & Astronomy, University of Missouri-St. Louis - St. Louis, MO 63121, USA
Received: 20 January 2014
Accepted: 17 April 2014
Based on Maxwell's equations, we study the propagation of an ultrashort electromagnetic pulse through an array of carbon nanotubes with multi-level impurities. The effective equation for the vector potential of the electromagnetic field is first derived analytically and then solved numerically. We subsequently analyze the dependence of the pulse shape on the parameters of the energy spectrum of impurities, and more precisely on the impurity levels. Our analysis predicts a significant decrease in the pulse amplitude during the transient, which is associated with the competitive effects of dispersion and other nonlinear effects. We also uncover the effects of the hopping integrals and band gap of deep impurities on the pulse tail decay.
PACS: 78.67.-n – Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures / 78.67.Wj – Optical properties of graphene / 78.70.Gq – Microwave and radio-frequency interactions
© EPLA, 2014
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