before 2011
           
            
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        32. P. Zhang, C. Lou, S. Liu, J. Zhao, J. Xu, and Z. Chen, Tuning of Bloch modes, diffraction and refraction by two-dimensional lattice reconfiguration, Optics Letters, 35, 892 (2010). 
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        31. Daohong Song, Xiaosheng Wang, Daniel Shuldman, Jiandong Wang, Liqin Tang, Cibo Lou, Jingjun Xu, Jianke Yang, and Z. Chen, Observation of bandgap guidance of optical vortices in a tunable negative defect, Opt. Lett., 35, 2106 (2010). 
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        30. P. Zhang, C. Lou, S. Liu, F. Xiao, J. Zhao, J. Xu, and Z. Chen, Hybrid nonlinearity supported by nonconventionally biased photorefractive crystal, Applied Phys B, 95, 559 (2009). 
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