0000000000185741

AUTHOR

R. Moussa

showing 3 related works from this author

Analytical investigation of solitary waves in nonlinear Kerr medium

2004

Abstract We study analytically the solution of nonlinear equation which result from the propagation of electromagnetic waves within a nonlinear Kerr medium. The medium is characterized by a dielectric constant which varies periodically and depends on the local field intensity. As a first step, we detail the resolution of the nonlinear equations with a quadratic nonlinearity. After that, we apply the slowly varying envelope approximation to obtain a Sine–Gordon equation. In this kind of nonlinearity, a gap solitons occurs. Moreover we verify that the solutions of the nonlinear equation for all frequencies within the gap are solitons solutions. After that we study the conditions of apparition…

PhysicsSlowly varying envelope approximationKerr effectWave propagationOrganic ChemistryMathematical analysisNonlinear opticssine-Gordon equationAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic MaterialsInorganic ChemistryNonlinear systemsymbols.namesakeClassical mechanicssymbolsSolitonElectrical and Electronic EngineeringPhysical and Theoretical ChemistryNonlinear Sciences::Pattern Formation and SolitonsNonlinear Schrödinger equationSpectroscopyOptical Materials
researchProduct

Numerical study on localized defect modes in two-dimensional lattices: a high Q-resonant cavity

2003

Abstract The spectral widths and the quality factors of defect modes localized for different defects structures formed in a 2D photonic crystal composed of a square lattice of circular rods of indium antimonide (InSb) are theoretically investigated. It is first shown that some factors such as the lattice nature, the line defect orientation, the nature and the defect width have a significant influence on the optical properties of the studied structures and can improve the Q factor and defect peak transmission intensity. Particularly, the transmission spectra of the defects calculated by means the transfer-matrix-method for a particular structure of eight line defects introduced in its center…

FabricationMaterials scienceCondensed matter physicsbusiness.industryIndium antimonideCondensed Matter PhysicsSquare latticeSpectral lineRodElectronic Optical and Magnetic Materialschemistry.chemical_compoundOpticschemistryQ factorLattice (order)Electrical and Electronic EngineeringbusinessPhotonic crystalPhysica B: Condensed Matter
researchProduct

Photonic band gaps in highly ionic medium: CuCl, CuBr, CuI

2003

Abstract Using the transfer-matrix-method, we have studied the propagation of electromagnetic waves through two-dimensional (2D) and three-dimensional (3D) dispersive photonic band gap (PBG) structures constructed from copper halides materials, especially from CuCl compounds. A special attention has been paid to the effect of the polariton gap on the PBG properties. This study reveals that “Twin gaps” and “Twin brothers” concepts and the flattened bands phenomena in both polarizations and for both structures (i.e. 2D and 3D) are all consequences of the strong photon–phonon coupling, particularly near the long wave length transverse optical phonon frequency. Furthermore, results for comparis…

Materials scienceCondensed matter physicsBand gapWave propagationPhononTransfer-matrix method (optics)Physics::OpticsCondensed Matter PhysicsAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic MaterialsWavelengthPolaritonCondensed Matter::Strongly Correlated ElectronsElectronic band structurePhotonic crystalInfrared Physics & Technology
researchProduct