Modulational instability of copropagating light beams induced by cubic-quintic nonlinearity in nonlinear negative-index material

被引：16

作者：

Gupta, Rama ^{[2
]}

Raju, Thokala Soloman ^{[1
]}

Kumar, Choragudi Nagaraja ^{[2
]}

Panigrahi, Prasanta K. ^{[3
]}

机构：

[1] Karunya Univ, Dept Phys, Coimbatore 641114, Tamil Nadu, India

[2] Panjab Univ, Dept Phys, Chandigarh 160014, India

[3] Indian Inst Sci Educ & Res, Mohanpur 741252, Nadia, India

来源：

JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS | 2012年 / 29卷 / 12期

关键词：

METAMATERIALS; PERMITTIVITY; PERMEABILITY; PULSES;

D O I：

10.1364/JOSAB.29.003360

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We study the modulational instability (MI) of the continuous wave propagating through negative-index materials, based on the coupled cubic-quintic nonlinear Schrodinger equations. A comparison is made with the already available results on MI without including the quintic term. We find that this term helps in achieving MI, in otherwise impossible combinations of dispersion and nonlinearity. For example, spatial MI can occur in the focusing regime, and temporal MI becomes possible in the anomalous dispersion for defocusing nonlinearity, while in the case of the normal dispersion regime, it occurs for focusing nonlinearity, and spatiotemporal MI can occur in the focusing nonlinearity and normal dispersion. Moreover, this additional term provides extra freedom to control the amplitude of the MI gain profile. (c) 2012 Optical Society of America

引用

页码：3360 / 3366

页数：7

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