Abstract

We report the existence and stability of surface defect gap solitons in one-dimensional semi-infinite dual- frequency lattices and semi-infinite simple lattices with a defect between them in the saturable nonlinear medium. By changing the defect intensity, defect solitons can exist in different gaps. For a positive defect, solitons only exist in the semi-infinite gap and can be stable in the low power region. With an increase of the negative defect depth, defect solitons will exist in the semi-infinite gap, first gap, and the second gap.

© 2011 Optical Society of America

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