[1] Segev M, Crosignani B, Yariv A. Spatial solitons in photorefractive media [J]. Phys. Rev. Lett., 1992, 68(7): 923-926.
[2] Christodulides D N, Carvalho M. Bright, dark and gray spatial soliton states in photorefractive media [J]. J. Opt. Soc. Am. B, 1995, 12(9): 1628-1633.
[3] Valley G C, Segev M, Crosighani B, et al. Dark and bright photovoltaic solitons [J]. Phys. Rev. A, 1994, 50(6): R4457-R4460.
[4] Segev M, Valley G C, Bashaw M C, et al. Photovoltaic spatial solitons [J]. J. Opt. Soc. Am. B, 1997, 14(7): 1772-1781.
[6] Hou C F, Pei Y B, Zhou Z X, et al. Bright-dark incoherently coupled photovoltaic soliton pair [J]. Chinese Physics, 2005, 14(2): 349-352.
[9] Liphardt M, Goonesekera A, Jones B E, et al. High-performance photorefractive polymers [J]. Science, 1994, 263: 367-369.
[10] Ducharame S, Scott J C, Twieg R J, et al. Observation of the photorefractive effect in a polymer [J]. Phys. Rev. Lett., 1991, 66: 1846-1849.
[11] Moerner W E, Silence S M. Polymer photorefractive materials [J]. Chem. Rev., 1994, 94: 127-155.
[12] Shih M F, Sheu F W. Photorefractive polymeric optical spatial solitons [J]. Opt. Lett., 1999, 24: 1852-1855.
[14] Hou C F, Jiang Y Y, Yuan B H, et al. Incoherently coupled soliton pairs in photorefractive polymer [J]. Optical Materials, 2002, 19: 377-381.
[15] Srivastava S. Coupled bright-dark soliton pairs in polymeric photorefractive materials [J]. J. of Electromagnetic Wave and Applications, 2008, 22: 335-342.
[16] Zhao Y Y, Li L Y, et al. Orientation-enhanced photorefractive effect in PVK-PBA: DR1: TNT polymer [J]. Chin. Phys. Lett., 2004, 21: 1535-1538.