[1] F. Zernike. Phase contrast, a new method for the microscopic observation of transparent objects [J]. Physica, 1942, 19(7): 686～698

[2] Chen Juntang. Differential interference contrast [J]. Optical Instrumentation, 1984, 6(1): 1～15

[3] A. W. Lohmann, D. Mendlovic, Z. Zalevsky. Fractional Hilbert transform［J］. Opt. Lett., 1996, 21(4): 281～283

[4] A. W. Lohmann, E. Tepichin, J. G. Ramirez. Optical implementation of the fractional Hilbert transform for two-dimensional objects［J］. Appl. Opt., 1997, 36(26): 6620～6626

[5] Jeffrey A. Davis, Dylan E. McNamara, Don M. Cottrell. Image processing with the radial Hilbert transform: theory and experiments［J］. Opt. Lett., 2000, 25(2): 99～101

[6] Severin Furhapter, Alexander Jesacher, Stefan Bernet et al.. Spiral phase contrast imaging in microscopy［J］. Opt. Express, 2005, 13(3): 689～694

[7] Alexander Jesacher, Severin Furhapter, Stefan Bernet et al.. Shadow effects in spiral phase contrast microscopy［J］. Phys. Rev. Lett., 2005, 94(23): 233902

[8] S. S. R. Oemrawsingh, J. A. W. van Houwelingen, E. R. Eliel et al.. Production and characterization of spiral phase plates for optical wavelengths［J］. Appl. Opt., 2004, 43(3): 688～694

[9] Carmel Rotschild, Shachaf Zommer, Shulamit Moed et al.. Adjustable spiral phase plate［J］. Appl. Opt., 2004, 43(12): 2397～2399

[10] Shibiao Wei, Jing Bu, Siwei Zhu et al.. Image edge-enhancement in optical microscopy with a phase mismatched spiral phase plate［J］. Chin. Opt. Lett., 2011, 9(3): 031001

[11] Liu Tingting, Hong Zhengping, Guo Chengshan. Common path phase-shifting digital holography based on a spiral phase filtering［J］. J. Optoelectronics·Laser, 2008, 19(1): 96～99

[12] M. W. Beijersbergen, R. P. C. Coerwinkel, M. Kristensen et al.. Helical-wavefront laser beams produced with a spiral phase plate［J］. Opt. Commun., 1994, 112(5-6): 321～327

[13] V. V. Kotlyar, A. A. Almazov, S. N. Khonina et al.. Generation of phase singularity through diffraction of a plane or Gaussian beam by a spiral phase plate［J］. J. Opt. Soc. Am. A, 2005, 22(5): 849～861

[14] V. V. Kotlyar, S. N. Khonina, A. A. Kovalev et al.. Diffraction of a plane, finite radius wave by a spiral phase plate［J］. Opt. Lett., 2006, 31(11): 1597～1599

[15] V. V. Kotlyar, A. A. Kovalev, R. V. Skidanov et al.. Diffraction of a finite-radius plane wave and a Gaussian beam by a helical axicon and a spiral phase plate［J］. J. Opt. Soc. Am. A, 2007, 24(7): 1955～1964

[16] L. Allen, M. W. Beijersbergen, R. J. C. Spreeuw et al.. Orbital angular momentum of light and the transformation of Laguerre-Gaussian laser modes［J］. Phys. Rev. A, 1992, 45(11): 8185～8190

[17] Q. Xie, D. Zhao. Generation of dark hollow beams by using a fractional radial Hilbert transform system［J］. Opt. Commun., 2007, 275(2): 394～398

[18] Xue Dongmei, Liu Tingting, Guo Chengshan. Localized hollow beams generated through interference of double zero-order Bessel beams［J］. Acta Optica Sinica, 2007, 27(5): 771～775

[19] Xie Xinglong, Chen Shaohe, Deng Ximing. Light diffraction and diffraction-free beams［J］. Chinese J. Lasers, 1999, 26(1): 65～69

[20] Zhao Bin. Theory and experiments of coaxial di-nondiffracting beam［J］. Acta Optica Sinica, 2003, 23(12): 1460～1463

[21] Chen Jiabi, Su Xianyu. Optical Information Technique—Principles & Applications［M］. Beijing: Higher Education Press, 2002. 64