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Chin. Phys. B, 2013, Vol. 22(12): 129401    DOI: 10.1088/1674-1056/22/12/129401
GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS Prev   Next  

Modulational instability of optically induced nematicon propagation

L. Kavithaa b c, M. Venkatesha, S. Dhamayanthia, D. Gopic d
a Department of Physics, Periyar University, Salem-636 011, India;
b The Abdus Salam International Center for Theoretical Physics, Trieste, Italy;
c Center for Nanoscience and Nanotechnology, Periyar University, Salem-636 011, India;
d Department of Chemistry, Periyar University, Salem-636 011, India
Abstract  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.
Keywords:  solitons      computational methods      liquid crystals      nonlinearity  
Received:  01 February 2013      Revised:  30 May 2013      Accepted manuscript online: 
PACS:  94.05.Fg (Solitons and solitary waves)  
  46.15.-x (Computational methods in continuum mechanics)  
  64.70.pp (Liquid crystals)  
  47.20.Ky (Nonlinearity, bifurcation, and symmetry breaking)  
Corresponding Authors:  L. Kavitha     E-mail:  louiskavitha@yahoo.co.in

Cite this article: 

L. Kavitha, M. Venkatesh, S. Dhamayanthi, D. Gopi Modulational instability of optically induced nematicon propagation 2013 Chin. Phys. B 22 129401

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