Surface defect gap solitons in one-dimensional dual-frequency lattices
Zhu Wei-Ling(朱伟玲)a), Luo Li(罗莉)b), He Ying-Ji(何影记)c)†, and Wang He-Zhou(汪河洲)d)
a School of Science, Maoming University, Maoming 525000, China; b School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China; c School of Electronics and Information, Guangdong Polytechnic Normal University, Guangzhou 510665, China; d State Key Laboratory of Optoelectronic Materials and Technologies, Zhongshan (Sun Yat-Sen) University, Guangzhou 510275, China
Abstract We study the surface defect gap solitons in an interface between a defect of one-dimensional dual-frequency lattices and the uniform media. Some unique properties are revealed that such lattices can broaden the region of semi-finite gap, and the semi-finite gap exists not only in the positive and zero defects but also in the negative defect; unlike in the regular lattices, the semi-finite gap exists in the positive and zero defects but does not exist in the negative defect. In particular, stable solitons exist almost in the whole semi-finite gap for the positive and zero defects. These properties are different from other lattices with defects. In addition, it is found that the existence of surface dual-frequency lattice solitons does not need a threshold power.
Received: 13 November 2008
Revised: 18 May 2009
Accepted manuscript online:
Fund: Project supported by the National
Natural Science Foundation of China (Grant No 10774031) and Natural
Science Foundation of Guangdong Province of China (Grant No
07001790).
Cite this article:
Zhu Wei-Ling(朱伟玲), Luo Li(罗莉), He Ying-Ji(何影记), and Wang He-Zhou(汪河洲) Surface defect gap solitons in one-dimensional dual-frequency lattices 2009 Chin. Phys. B 18 4319
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