Modulational instability of optically induced nematicon propagation  

作　　者：L. Kavitha M. Venkatesh S. Dhamayanthi D. Gopi 

机构地区：[1]Department of Physics, Periyar University [2]The Abdus Salam International Center for Theoretical Physics [3]Center for Nanoscience and Nanotechnology, Periyar University [4]Department of Chemistry, Periyar University

出　　处：《Chinese Physics B》2013年第12期578-588,共11页中国物理B（英文版）

基　　金：One of the authors (L. Kavitha) gratefully acknowledges the financial support from NBHM, India in the form of major research project, BRNS, India in the form of Young Scientist Research Award and ICTP, Italy in the form of Junior Associateship;UGC, India for financial assistance in the form of Research Award;M. Venkatesh acknowledges BSR-Research Fellowship under UGC Non-SAP Scheme, India;S. Dhamayanthi thanks the University Research Fellowship (URF) given by Periyar Uni- versity, India.

摘　　要：We report the modulational instability （MI） analysis for the modulation equations governing the propagation of coherent polarized light through a nematic liquid crystal （NLC） slab, in the limit of low light intensity and local material response. The linear stability analysis of the nonlinear plane wave solutions is performed by considering both the wave vectors （k,l） of the basic states and wave vectors （K,L） of the perturbations as free parameters. We compute the MI gain, and the MI gain peak is reduced and the stable bandwidth is widened with the increase of the strength of the applied electric field. Further, we invoke the extended homogeneous balance method and Exp-function method aided with symbolic computation and obtain a series of periodic solitonic humps of nematicon profiles admitting the propagation of laser light in the NLC medium.We report the modulational instability （MI） analysis for the modulation equations governing the propagation of coherent polarized light through a nematic liquid crystal （NLC） slab, in the limit of low light intensity and local material response. The linear stability analysis of the nonlinear plane wave solutions is performed by considering both the wave vectors （k,l） of the basic states and wave vectors （K,L） of the perturbations as free parameters. We compute the MI gain, and the MI gain peak is reduced and the stable bandwidth is widened with the increase of the strength of the applied electric field. Further, we invoke the extended homogeneous balance method and Exp-function method aided with symbolic computation and obtain a series of periodic solitonic humps of nematicon profiles admitting the propagation of laser light in the NLC medium.

关 键 词：solitons computational methods liquid crystals nonlinearity 

分 类 号：O437[机械工程—光学工程]