Abstract
Received 28 August 2008; published 17 October 2008We study theoretically light beam propagation in one-dimensional periodic media with intensity-resonantnonlinearity. The phenomenon of discrete modulational instability is investigated in detail as well as theconditions for the existence and stability of fundamental lattice and surface soliton modes. According to thelinear stability analysis, only on-site solitons are stable. The mobility of lattice solitons is analyzed by both freeenergy and mapping concepts. Only broad solitons may freely traverse the lattice.DOI: 10.1103/PhysRevA.78.043819 PACS number s : 42.65.Tg, 63.20.Pw, 42.25.Gy
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