[1] ASHKIN A, DZIEDZIC J M, BJORKHOLM J E， et al. Observation of a single-beam gradient force optical trap for dielectric particles ［J］. Opt. Lett. , 1986, 11: 288-290.

[2] ASHKIN A, DZIEDZIC J M,YAMANE T. Optical trapping and manipulation of single cells using infrared laser beams［J］. Nature, 1987, 330: 769-771.

[3] BROUHARD G J, SCHEK H T, HUNT A J. Advanced optical tweezers for the study of cellular and molecular biomechanics ［J］. IEEE Transactions on Biomedical Engineering, 2003, 50(1): 121-125.

[4] 李剑平,李栋. OCT技术在发育生物学中的应用［J］. 应用光学，2005,26(2):60-64.

    LI Jian-ping, LI Dong. Applications of OCT technique in developmental biology ［J］. Journal of Applied Optics, 2005, 26(2):60-64. (in Chinese with an English abstract)

[5] 李文成, 谷晋骐, 王涌萍. 激光光斑及束腰光斑尺寸的测量研究［J］. 应用光学，2002,23(3):30-33.

    LI Wen-cheng, GU Jin-qi, WANG Yong-ping. Research on laser spot and beam waist spot size measurement ［J］. Journal of Applied Optics, 2002, 23(3):30-33. (in Chinese with an English abstract)

[6] LI Y, WOLF E. Focal shifts diffracted converging spherical waves ［J］. Optics Communication, 1981, 39(4):211-215.

[7] LI Y, WOLF E. Focal shift in focused truncated Gaussian beams ［J］. Optics Communication, 1982, 42(3): 151-156.

[8] MARTINEZ M, CLIMENT V. Focal switch: a new effect in low-Fresnel- number systems ［J］. Applied Optics, 1996, 35(1):24-27.

[9] GAO Xiu-min , ZHOU Fei, XU Wen-dong , et al. Gradient force pattern, focal shift, and focal switch in an apodized optical system ［J］. Optik，2005，116：99-106.

[10] 郝中骐, 文伟. 余弦平方高斯光束的双焦开关和焦平面［J］. 激光技术，2008, 32(6):663-666.

    HAO Zhong-qi，WEN Wei. Double focal switch and focal plane of cosine-squared Gaussian beams ［J］. Laser Technology, 2008, 32(6):663-666. (in Chinese with an English abstract)

[11] GARCES-CHAVES V, Mc GOIN D, MELVILLE H, et al. Simultaneous micromanipulation in multiple planes using a self reconstruction light beam ［J］. Nature, 2002, 419:145-147.

[12] 王于刚, 徐建波, 吴福燕，等. 光镊中轴向光阱力的研究［J］. 激光与红外, 2008, 38(2):109-111.

    WANG Yu-gang, XU Jian-bo, WU Fu-yan,et al. Study on the axial force in optical tweezers ［J］. Laser & Infrared, 2008, 38(2):109-111. (in Chinese with an English abstract)