Journal ArticleDOI
Effects of higher order nonlinearities on modulational instability in nonlinear oppositely directed coupler
Alidou Mohamadou,Patrick Herbert Tatsing,C.G. Latchio Tiofack,Conrad Bertrand Tabi,Timoleon Crepin Kofane +4 more
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In this article, the authors investigated the gain spectrum of a nonlinear optical coupler with a negative-index metamaterial channel whose nonlinear response includes third and fifth-order terms.Abstract:
We are motivated by recent studies in medium formed by two tunnel-coupled waveguides. One of the waveguides is manufactured from an ordinary dielectric, while the second has negative refraction. We present an investigation of the gain spectrum permitting modulation instability in the nonlinear optical coupler with a negative-index metamaterial channel whose non-linear response includes third- and fifth-order terms. The principal motivation for our analysis stems from the impact of the inevitable presence of the effective cubic–quintic nonlinearity. We emphasize the influence of higher order nonlinear terms, over the MI phenomena, and the outcome of its development achieved by using linear stability analysis. Gain spectrum investigation has been carried out for both anomalous and normal dispersion regime in the focusing and defocusing cases of nonlinearity and near-zero dispersion regime where higher order linear dispersive effects emerge. Our results show that the MI gain spectra consist of multiple spect...read more
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Plasma instabilities and nonlinear effects
TL;DR: In this paper, the authors present an analysis of the effect of magnetic mirror and drift wave instability on the field-aligned current-anomalous resistivity of a Cylindrical current with infinite conductivity.
Journal ArticleDOI
Modulation instability in a nonlinear oppositely directed coupler with saturable nonlinearities and higher-order effects
TL;DR: In this paper, the influence of a saturable nonlinearity on the modulation instability in an oppositely directed coupler in the presence of high-order effects is investigated, and the instability gain is attained by using standard linear stability analysis.
Journal ArticleDOI
Electronegative nonlinear oscillating modes in plasmas
TL;DR: The theory of modulational instability is used to show the correlation between the parametric analysis and the formation of modulated solitons, obtained here as bright envelopes and kink-wavesolitons.
Journal ArticleDOI
Saturable higher nonlinearity effects on the modulational instabilities in three-core triangular configuration couplers
P Mohanraj,R Sivakumar +1 more
TL;DR: In this article, the modulational instability (MI) regions due to modified nonlinear saturability over and above other high-order nonlinearities for the triangular configuration of a three-core oppositely directed coupler were observed.
Journal ArticleDOI
Modulation instability in a triangular three-core coupler with a negative-index material channel
TL;DR: In this article, a theoretical analysis of the modulation instability in the three core triangular oppositely directed coupler with negative index material channel is presented, and new ways to generate and manipulate the MI and solitons in three-core triangular diametric couplers with a particular emphasis on a negative-index material (NIM) channel.
References
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Negative Refraction Makes a Perfect Lens
TL;DR: The authors' simulations show that a version of the lens operating at the frequency of visible light can be realized in the form of a thin slab of silver, which resolves objects only a few nanometers across.
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The Electrodynamics of Substances with Simultaneously Negative Values of ∊ and μ
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Composite Medium with Simultaneously Negative Permeability and Permittivity
TL;DR: A composite medium, based on a periodic array of interspaced conducting nonmagnetic split ring resonators and continuous wires, that exhibits a frequency region in the microwave regime with simultaneously negative values of effective permeability and permittivity varepsilon(eff)(omega).
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Controlling Electromagnetic Fields
TL;DR: This work shows how electromagnetic fields can be redirected at will and proposes a design strategy that has relevance to exotic lens design and to the cloaking of objects from electromagnetic fields.
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Optical negative-index metamaterials
TL;DR: In this paper, a review describes the recent progress made in creating nanostructured metamaterials with a negative index at optical wavelengths, and discusses some of the devices that could result from these new materials.