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year 27, Issue 2 (ICOP & ICPET 2021 2021)
ICOP & ICPET _ INPC _ ICOFS 2021, 27(2): 76-79 |
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Ghayemmoniri Z, Nemati Siahmazgi R, Jafari S. THz generation via the interaction of chirped laser pulse with plasma in presence of the external tapered magnetic field in carbon nanotubes. ICOP & ICPET _ INPC _ ICOFS 2021; 27 (2) :76-79
URL: http://opsi.ir/article-1-2310-en.html
URL: http://opsi.ir/article-1-2310-en.html
1- Department of Physics, University of Guilan
Abstract: (1119 Views)
In this paper, we discuss the effect of a tapered magnetic field on terahertz generation in carbon nanotubes. Terahertz radiation is generated by beating of two lasers (w1,k1) and (w2,k2) in nanotube array on a dielectric substrate. The free electrons of nanotubes acquire a large oscillatory velocity. In the presence of a tapered magnetic field, the laser exerts a ponderomotive force on the free electrons of carbon nanotubes. This force causes a nonlinear current density. Each nanotube acts as an oscillating electric dipole to produce terahertz radiation at beat frequency, i.e. w2-w1. Our numerical simulations reveal that terahertz generation power noticeably increases at plasmon resonance wT~0.7wp in the presence of a tapered magnetic field.
Keywords: Terahertz generation, Nonlinear current density, Tapered magnetic field, Carbon nanotubes, Ponderomotive forces.
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