Nonlocal defect solitons in parity–time-symmetric photonic lattices with spatially modulated nonlinearity

We report the existence and stability of nonlocal defect solitons (NDSs) in parity-time-symmetric photonic lattices with spatially modulated nonlocal nonlinearity. We reveal that solitons exist in the semi-infinite gap and a defect in the real part of nonlinear lattices plays a significant role in controlling the extent of the stability domains. We show that the existence and stability of the NDSs can be profoundly affected by the parameters of the nonlinear lattice structures. (C) 2013 Optical Society of America