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Opt Express. 2011 Jun 6;19(12):11457-62. doi: 10.1364/OE.19.011457.

Defect solitons in parity-time symmetric superlattices.

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  • 1Laboratory of Photonic Information Technology, SIPSE & LQIT, South China Normal University, Guangzhou, China.


We study defect solitons (DSs) in a parity-time (PT) symmetric superlattice with focusing Kerr nonlinearity. The properties of the DSs with a PT symmetrical potential are obviously different from those in a superlattice with a real refractive index. Unusual features stemming from PT symmetry can be found. Research results show that the solitons with a zero defect or a positive defect can exist and stably propagate in the semi-infinite gap, but they cannot exist in the first gap. For the case of a negative defect, the soliton can stably exist in both the semi-infinite gap and the first gap.

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