We report the existence and stability of gap solitons in parity-time (PT) complex periodic optical lattices with the real part of superlattices. These solitons can stably exist in the semi-infinite gap. We have studied the effects of different relative strengths of the superlattices and different amplitudes of the imaginary part on soliton propagation. It was found that the relative strength of the superlattices and the amplitude of the imaginary part significantly affect the PT symmetry and the stability of solitons in the PT complex periodic optical lattices.
© 2011 Optical Society of America
Optics in Computing
Original Manuscript: February 24, 2011
Revised Manuscript: June 11, 2011
Manuscript Accepted: June 16, 2011
Published: July 13, 2011
Xing Zhu, Hong Wang, Li-Xian Zheng, Huagang Li, and Ying-Ji He, "Gap solitons in parity-time complex periodic optical lattices with the real part of superlattices," Opt. Lett. 36, 2680-2682 (2011)