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4pi聚焦系统中振幅和相位调制的径向偏振涡旋光束聚焦特性的研究

常强 杨艳芳 何英 刘海港 刘键

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4pi聚焦系统中振幅和相位调制的径向偏振涡旋光束聚焦特性的研究

常强, 杨艳芳, 何英, 刘海港, 刘键

Study of the focusing features of spatial amplitude and phase modulated radially polarized vortex beams in a 4pi focusing system

Chang Qiang, Yang Yan-Fang, He Ying, Liu Hai-Gang, Liu Jian
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  • 基于Richards-Wolf矢量衍射积分公式, 研究了径向偏振涡旋光束在振幅和相位调制下的4pi聚焦特性.振幅调制是通过振幅滤波实现, 即改变入射光束起始积分值达到调节,相位调制是通过添加相位延迟角δ 的液晶相位延迟器来改变入射光束的偏振态.模拟结果显示,随着振幅的减小, 4pi聚焦系统焦点附近的光轴上呈现出多光球结构; 而相位调制对焦点附近的光强分布产生拉伸作用, 即调节入射光束的拓扑核m和相位延迟器的延迟角δ,可以得到特殊的光强分布. 随着相位δ增大, m=0产生的多光球结构慢慢向光链结构转变,最终变成暗通道;而m=1产生的光链结构慢慢变成光球结构; m=2产生的暗通道变成光球和光链叠加的结构, 这种特殊聚焦光束在光学微操纵领域具有潜在的应用价值.
    The focusing properties of phase and amplitude modulated radially polarized vortex beams in a 4pi focusing system are theoretically investigated near the focal plane by using Richards-Wolf vectorial diffraction method. The amplitude modulation of vortex beams can be adjusted by changing the start integration value. The phase modulation of vortex beams can be realized by adding liquid crystal variable retarder with the phase delay angle δ. The simulated results show that multiple spherical spots can be obtained near the focus of the 4pi focusing system with the decrease of amplitude. The phase delay angle δ of the input beams can generate extruding effect for the electrical field distribution near the focus of the 4pi focusing system. Some special intensity distributions can be obtained by changing topological charge m and phase delay angle δ. Optical chain can be generated in the case of m=1. Dark channel can be obtained in the case of m=2. These special focusing beams can also transform with phase modulation. With the increase of phase δ, the multiple spherical spots at m=0 change slowly into an optical chain, and finally become a dark channel. In contrast, the optical chain at m=1 changes slowly into multiple spherical spots; and the dark channel at m=2 changes into the superposition of optical spherical spots and the optical chain. These special focusing beams have potential applications in optical trapping and micro-manipulation.
    • 基金项目: 国家自然科学基金(批准号: 61108010, 11204170)、上海市自然科学基金(批准号: 11ZR1412300)、上海市重点学科建设项目(批准号: S30105)和上海大学科技创新基金资助的课题.
    • Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 61108010, 11204170), the Natural Science Foundation of Shanghai, China (Grant No. 11ZR1412300), the Key Disciplines Construction Project of Shanghai of China (Grant No. S30105) and the Science and Technology Innovation Fund of Shanghai University, China.
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    Ashkin A, Dziedzic J M, Yamane T 1987 Nature 330 769

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    Brouhard G J, Schek H T, Hunt A J 2003 IEEE T. Bio-med. Eng. 50 121

    [3]

    Kawata S, Inouye Y, Sugiura T 1994 Jpn. J. Appl. Phys. 33 1725

    [4]

    Parthenopoulos D A, Rentzepis P M 1989 Science 25 843

    [5]

    Ignatovich F V, Hartschuh A, Novotny L 2003 J. Mod. Opt. 50 1509

    [6]

    Li C F 2009 Phys. Rev. A 80 063814

    [7]

    Eriksen R L, Mogensen P C, Glckstad J 2002 Opt. Lett. 27 267

    [8]

    Li J L, Ueda K, Musha M, Shirakawa A, Zhong L X 2006 Opt. Lett. 31 2969

    [9]

    Hell S, Stelzer E H K 1992 J. Opt. Soc. Am. A 9 2159

    [10]

    Bokor N, Davidson N 2004 Opt. Lett. 29 1968

    [11]

    Chen W B, Zhan Q W 2009 Opt. Lett. 34 2444

    [12]

    Yan S H, Yao B L, Zhao W, Lei M 2010 J. Opt. Soc. Am. A 27 2033

    [13]

    Yan S H, Yao B L, Rupp R 2011 Opt. Express 19 673

    [14]

    Chen Z Y, Zhao D M 2012 Opt. Lett. 37 1286

    [15]

    Chang Q, Yang Y F, He Y, Leng M, Liu H G 2012 Acta Opt. Sin. 32 0626001 (in Chinese) [常强, 杨艳芳, 何英, 冷梅, 刘海港 2012 光学学报 32 0626001]

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    Xu K, Yang Y F, He Y, Han X H, Li C F 2010 Acta Phys. Sin. 59 6125 (in Chinese) [徐凯, 杨艳芳, 何英, 韩小红, 李春芳 2010 物理学报 59 6125]

    [17]

    Richards B, Wolf E 1959 Proc. R. Soc. Lond. A 253 358

    [18]

    Fang G J, Tian B, Pu J X 2012 Opt. Laser Technol. 44 441

    [19]

    Wang X L, Ding J P, Qin J Q, Chen J, Fan Y X, Wang H T 2009 Opt. Commun. 282 3421

    [20]

    Zhao Y Q, Zhan Q W, Zhang Y L, Li Y P 2005 Opt. Lett. 30 848

    [21]

    Iketaki Y, Watanabe T, Bokor N, Fujii M 2007 Opt. Lett. 32 2357

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出版历程
  • 收稿日期:  2012-10-30
  • 修回日期:  2012-12-07
  • 刊出日期:  2013-05-05

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