中国物理B ›› 2009, Vol. 18 ›› Issue (10): 4319-4325.doi: 10.1088/1674-1056/18/10/038

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Surface defect gap solitons in one-dimensional dual-frequency lattices

何影记1, 罗莉2, 朱伟玲3, 汪河洲4   

  1. (1)School of Electronics and Information, Guangdong Polytechnic Normal University, Guangzhou 510665, China; (2)School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China; (3)School of Science, Maoming University, Maoming 525000, China; (4)State Key Laboratory of Optoelectronic Materials and Technologies, Zhongshan (Sun Yat-Sen) University, Guangzhou 510275, China
  • 收稿日期:2008-11-13 修回日期:2009-05-18 出版日期:2009-10-20 发布日期:2009-10-20
  • 基金资助:
    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).

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)   

  1. 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
  • Received:2008-11-13 Revised:2009-05-18 Online:2009-10-20 Published:2009-10-20
  • Supported by:
    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).

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摘要： 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.

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.

Key words: dual-frequency lattices, surface defect gap solitons

中图分类号:  (Photonic bandgap materials)

  • 42.70.Qs
42.65.Tg (Optical solitons; nonlinear guided waves) 42.65.Wi (Nonlinear waveguides) 78.68.+m (Optical properties of surfaces)