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Moradi A.,Iran University of Science and Technology | Moradi A.,Institute for Studies in Theoretical Physics and Mathematics IPM
Optics Communications | Year: 2010

Propagation of surface plasma waves in a metallic single-walled carbon nanotube that either is encapsulated in a solid metallic channel or encapsulates a metallic nanowire are studied within the framework of the classical electrodynamics. The linearized hydrodynamic theory is used to describe the electronic excitations on the nanotube's surface, while the dielectric function of dielectric media is modeled on the basis of the Drude approximation. It is shown that for all wavelengths, only the transverse magnetic wave with no angular dependence can propagate in these systems and the dispersion relations of this mode are obtained. © 2009 Elsevier B.V. All rights reserved. Source


Moradi A.,Iran University of Science and Technology | Moradi A.,Institute for Studies in Theoretical Physics and Mathematics IPM
Physics of Plasmas | Year: 2011

We apply the plasmon hybridization method to a double-nano-wire system, providing a simple and intuitive description of the plasmon excitations in the system. We apply the two-center cylindrical coordinate system for mathematical convenience and find an explicit form of the surface plasmon oscillations, in terms of the interaction between the bare plasmon modes of the individual surfaces of the nano-wires. We present numerical results to display how the plasmon excitations of the system depend on nano-wire separation when there is no angular momentum transfer, i.e., when m=f0. © 2011 American Institute of Physics. Source


Moradi A.,Kermanshah University of Technology | Moradi A.,Institute for Studies in Theoretical Physics and Mathematics IPM
Physics Letters, Section A: General, Atomic and Solid State Physics | Year: 2015

The propagation of bulk and surface plasma waves in a thin quantum plasma film is investigated, taking into account the quantum effects. The generalized bulk and surface plasma dispersion relation due to quantum effects is derived, using the quantum hydrodynamic dielectric function and applying appropriate additional boundary conditions. The quantum mechanical and film geometric effects on the bulk and surface modes are discussed. It is found that quantum effects become important for a thin film of small thickness. © 2015 Elsevier B.V. Source


Moradi A.,Iran University of Science and Technology | Moradi A.,Institute for Studies in Theoretical Physics and Mathematics IPM
Solid State Communications | Year: 2014

We study the extinction spectra of an isolated C60 molecule, within the framework of the vector wave function method. Electronic excitations on the C60 molecule surface are modeled by an infinitesimally thin spherical layer of the σ and π electrons, which is described by means of the two-dimensional two-fluid model. Numerical results show that a strong interaction between the fluids gives rise to the splitting of the extinction spectra into two peaks in a quantitative agreement with the π and σ+π plasmon energies. © 2014 Elsevier Ltd. Source


Moradi A.,Kermanshah University of Technology | Moradi A.,Institute for Studies in Theoretical Physics and Mathematics IPM
Physics of Plasmas | Year: 2015

To study the scattering of electromagnetic radiation by a spherical metallic nanoparticle with quantum spatial dispersion, we develop the standard nonlocal Mie theory by allowing for the excitation of the quantum longitudinal plasmon modes. To describe the quantum nonlocal effects, we use the quantum longitudinal dielectric function of the system. As in the standard Mie theory, the electromagnetic fields are expanded in terms of spherical vector wavefunctions. Then, the usual Maxwell boundary conditions are imposed plus the appropriate additional boundary conditions. Examples of calculated extinction spectra are presented, and it is found that the frequencies of the subsidiary peaks, due to quantum bulk plasmon excitations exhibit strong dependence on the quantum spatial dispersion. © 2015 AIP Publishing LLC. Source

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