Search results for "Electromagnetic wave propagation"

showing 3 items of 3 documents

Modulational instability and generation of self-induced transparency solitons in resonant optical fibers

2009

International audience; We consider continuous-wave propagation through a fiber doped with two-level resonant atoms, which is described by a system of nonlinear Schrodinger-Maxwell-Bloch (NLS-MB) equations. We identify the modulational instability (MI) conditions required for the generation of ultrashort pulses, in cases of both anomalous and normal GVD (group-velocity dispersion). It is shown that the self-induced transparency (SIT) induces non-conventional MI sidebands. The main result is a prediction of the existence of both bright and dark SIT solitons in the anomalous and normal GVD regimes.

Dark solitonOptical fiberNonlinear opticsElectromagnetic wave propagationWave propagationSelf-induced transparency01 natural sciencesDoped materialslaw.invention010309 opticsOpticslawVelocity dispersion0103 physical sciencesDispersion (optics)Optical solitonsGroup velocityOptical fibers010306 general physicsSelf-phase modulationNonlinear Sciences::Pattern Formation and SolitonsModulation instabilityTwo level atomPhysicsUltrashort pulsebusiness.industryNonlinear opticsSelf-phase modulationNonlinear equationsAtomic and Molecular Physics and Optics[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistryModulational instability[CHIM.THEO] Chemical Sciences/Theoretical and/or physical chemistry[ CHIM.THEO ] Chemical Sciences/Theoretical and/or physical chemistryGroup velocitySchroedinger equationLinear stabilitybusinessUltrashort pulse
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Modulational instability in optical fibers with arbitrary higher-order dispersion and delayed Raman response

2006

International audience; We analyse modulational instability (MI) of electromagnetic waves in a large variety of optical fibers having different refractive-index profiles. For the normal-, anomalous-, and zero-dispersion regimes of the wave propagation, we show that whenever the second-order dispersion competes with higher-order dispersion (HOD), propagation of plane waves leads to a rich variety of dynamical behaviors. Most of the richness comes from the existence of critical behaviors, which include situations in which the HOD suppresses MI in the anomalous dispersion regime, and other situations in which the HOD acts in the opposite way by inducing non-conventional MI processes in the nor…

Optical fiberElectromagnetic wave propagationWave propagationPlane waveRefractive indexPlane wavesElectromagnetic radiationlaw.inventionsymbols.namesakeOpticslawDispersion (optics)Optical fibersElectrical and Electronic EngineeringPhysical and Theoretical ChemistryModulation instabilityPhysicsbusiness.industryAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic MaterialsModulational instability[CHIM.THEO] Chemical Sciences/Theoretical and/or physical chemistry[ PHYS.PHYS.PHYS-AO-PH ] Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph][ CHIM.THEO ] Chemical Sciences/Theoretical and/or physical chemistrysymbolsbusinessRaman spectroscopyRefractive index
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Propagation of Dyakonon Wave-Packets at the Boundary of Metallodielectric Lattices

2013

We rigorously analyze the propagation of localized surface waves that takes place at the boundary between a semi-infinite layered metal-dielectric (MD) nanostructure cut normally to the layers and a isotropic medium. It is demonstrated that Dyakonov-like surface waves (also coined dyakonons) with hybrid polarization may propagate in a wide angular range. As a consequence, dyakonon-based wave-packets (DWPs) may feature sub-wavelength beamwidths. Due to the hyperbolic-dispersion regime in plasmonic crystals, supported DWPs are still in the canalization regime. The apparent quadratic beam spreading, however, is driven by dissipation effects in metal. This work was supported by the Spanish Mini…

PhysicsBirefringenceElectromagnetic wave propagationCondensed matter physicsWave propagationWave packetSurface plasmonIsotropyNanophotonicsPhysics::OpticsSurface plasmonsDissipationPolarization (waves)01 natural sciencesAtomic and Molecular Physics and Optics010309 opticsSurface wave0103 physical sciencesElectrical and Electronic Engineering010306 general physicsÓptica
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