[1] Huang Shihua, Wu Fengmin, Hu Bo. Formula for the phase velocity of electromagnetic waves[J]. Phys. Rev. E, 2009, 79(4): 047601

[2] Huang Xiaoqing, Liao Xuhong, Cui Xiaohua et al.. Nonlinear waves with negative phase velocity[J]. Phys. Rev. E, 2009, 80(3): 036211

[3] Guo Qizhi, Tan Weihan. Superluminal group velocity and effective velocity of information transfer[J]. Acta Optica Sinica, 2007, 27(2): 344～349

[4] Wang Hao, Zhang Yundong, Ye Jianbo et al.. Direct observation of signal evolution of slow and fast light in erbium-doped optical fiber[J]. Acta Optica Sinica, 2009, 29(7): 1938～1942

[5] M. A. I. Talukder, Y. Amagishi, M. Tomita. Superluminal to subluminal transition in the pulse propagation in a resonantly absorbing medium[J]. Phys. Rev. Lett., 2001, 86(16): 3546～3549

[6] D. R. Solli, C. F. McCormick, C. Ropers et al.. Demonstration of superluminal effects in an absorptionless nonrefective system[J]. Phys. Rev. Lett., 2003, 91(14): 143906

[7] H. Chang, D. D. Smith. Gain-assisted superluminal propagation in coupled optical resonators[J]. J. Opt. Soc. Am. B, 2005, 22(10): 2237～2241

[8] A. V. Turukhin, V. S. Sudarshanam, M. S. Shahriar. Observation of ultraslow and stored light pulses in a solid[J]. Phys. Rev. Lett., 2002, 88(2): 023602

[9] T. Jiang, J. M. Zhao, Y. J. Feng. Stopping light by an air waveguide with anisotropic metamaterial cladding[J]. Opt. Express, 2009, 17(1): 170～177

[10] G. Dolling, C. Enkrich, M. Wegener et al.. Simultaneous negative phase and group velocity of light in a metamaterial[J]. Science, 2006, 312(5775): 892～894

[11] Wang Hao, Zhang Chunguang, Li Hui. Informaion speed in controllable light velocity[J]. Laser & Optoelectonics Progress, 2011, 48(3): 031902

[12] Xing Liang, Zhan Li, Yi Lilin et al.. Latest developments of research on controllable slow light in optical fibers[J]. Laser & Optoelectonics Progress, 2006, 43(7): 16～21

[13] Wang Hao, Zhang Chunguang, Li Hui. Optical interferometer with high sensitivity based on controllable group velocity[J]. Laser & Optoelectonics Progress, 2011, 48(4): 041902

[14] D. Han, Y. G. Zeng, Y. F. Bai et al.. Superluminal optical solitons in a four-level tripod atomic system[J]. J. Phys. B., 2006, 39(7): 3029～3035

[15] V. Yannopapas, E. Paspalakis, N. V. Vitanov. Electromagnetically induced transparency and slow light in an array of metallic nanoparticles[J]. Phys. Rev. B, 2009, 80(3): 035104

[16] M. A. Porras, R. Borghi, M. Santarsiero. Superluminality in Gaussian beams[J]. Opt. Commun., 2002, 203(3): 183～189

[17] S. Banerjee, S. Sepke, R. Shah et al.. Optical deflection and temporal characterization of an ultrafast laser-produced electron beam[J]. Phys. Rev. Lett., 2005, 95(3): 035004

[18] S. Weber, G. Riazuelo, P. Michel et al.. Modeling of laser-plasma interaction on hydrodynamic scales: physics development and comparison with experiments[J]. Laser & Partcle Beams, 2004, 22(4): 189～195

[19] D. M. Deng, H. Guo, D. A. Han et al.. Effects of dispersion and longitudinal chromatic aberration on the focusing of isodiffracting pulsed Gaussian light beam[J]. Phys.Lett. A, 2005, 334(1): 73～80

[20] M. Born, E. Wolf. Principles of Optics[M]. Cambridge: Cambridge University Press, 1999