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轴向位置可调的双中空环形光斑

田玉元 张佳琦 姜潇桐 孙美玉 史强 朱林伟

田玉元, 张佳琦, 姜潇桐, 孙美玉, 史强, 朱林伟. 轴向位置可调的双中空环形光斑[J]. 中国光学(中英文), 2023, 16(2): 329-338. doi: 10.37188/CO.2022-0036
引用本文: 田玉元, 张佳琦, 姜潇桐, 孙美玉, 史强, 朱林伟. 轴向位置可调的双中空环形光斑[J]. 中国光学(中英文), 2023, 16(2): 329-338. doi: 10.37188/CO.2022-0036
TIAN Yu-yuan, ZHANG Jia-qi, JIANG Xiao-tong, SUN Mei-yu, SHI Qiang, ZHU Lin-wei. Double doughnut-shaped focal spots with controllable position in axial direction[J]. Chinese Optics, 2023, 16(2): 329-338. doi: 10.37188/CO.2022-0036
Citation: TIAN Yu-yuan, ZHANG Jia-qi, JIANG Xiao-tong, SUN Mei-yu, SHI Qiang, ZHU Lin-wei. Double doughnut-shaped focal spots with controllable position in axial direction[J]. Chinese Optics, 2023, 16(2): 329-338. doi: 10.37188/CO.2022-0036

轴向位置可调的双中空环形光斑

doi: 10.37188/CO.2022-0036
基金项目: 国家自然科学基金(No. 62174073, No. 61675093);山东省重大科技创新工程项目(No. 2019JZZY020219);烟台市科技创新发展计划(No. 2020XDRH095)
详细信息
    作者简介:

    田玉元(1999—),男,山东淄博人,硕士研究生,2021年于鲁东大学获得理学学士学位,现为鲁东大学物理与光电工程学院硕士研究生,主要从事光场调制方面的研究。E-mail:tyy198535676379@126.com

    孙美玉(1982—),女,山东烟台人,硕士,讲师,2008年于鲁东大学获得硕士学位,2008年至今于鲁东大学物理与光电工程学院任教。主要从事信息光学与衍射光学以及超高分辨率成像方面的研究。E-mail:s.m.y.2008@168.com

    史 强(1987—),男,山东烟台人,博士,教授,硕士生导师,2010年于山东大学获得学士学位,2017年于德国卡尔斯鲁厄理工学院获得博士学位,2018年于新加坡国立大学做博士后,2018年回国创办烟台魔技纳米科技有限公司,2020年于鲁东大学物理与光电工程学院任教。主要从事微纳激光三维制造方面的研究。E-mail:shi.qiang@magie-nano.com

  • 中图分类号: O436

Double doughnut-shaped focal spots with controllable position in axial direction

Funds: Supported by National Natural Science Foundation of China (No. 62174073, No. 61675093); Key Research and Innovation Project of Shandong Province (No. 2019JZZY020219); Program of Science and Technology Development of Yantai (No. 2020XDRH095).
More Information
  • 摘要:

    为了产生轴向双焦点中空环形光斑,基于矢量衍射积分得出的环带半径公式,设计产生了呈环带分布的轴向双焦点的螺旋相位,并研究了这种螺旋相位在高数值孔径物镜聚焦区域的光斑特性。首先,给出了线偏振以及圆偏振的涡旋光束在高数值孔径物镜聚焦条件下的积分表达式。然后,利用此积分表达式数值模拟了线偏振光与圆偏振光在不同轴向偏移距离及螺旋拓扑荷值时的聚焦光场分布。最后,将轴向双焦点螺旋相位加载到纯相位空间光调制器上,分别对圆偏振光与线偏振光入射进行实验研究。线偏振光入射时,实验产生了拓扑荷为1且轴向距离为±10 μm、±15 μm的双聚焦环形光斑;圆偏振光入射时,产生了轴向距离为±20 μm且拓扑荷为1到4时的双聚焦环形光斑。数值模拟与实验结果表明:圆偏振光与线偏振光经此螺旋相位调制后,在紧聚焦区域可产生轴向距离与暗斑大小可调的中空环形双焦点;圆偏振光较线偏振光产生的空心光斑光强分布更均匀,呈圆对称分布。此轴向双焦点螺旋相位有望在光学微操控、双光束超分辨纳米光刻以及STED显微成像方面获得一定的应用。

     

  • 图 1  涡旋相位波带片结构示意图

    Figure 1.  Schematic diagram of the vortex phase zone plate

    图 2  线偏振光入射时的数值模拟结果,其中拓扑荷n=1,数值孔径NA=0.85。涡旋相位图中的轴向偏移距离分布为:(a) |Δz|=10 μm,(c) |Δz|=15 μm,(e) |Δz|=20 μm。(b)、 (d)、 (f)分别为对应的yz截面光强分布图

    Figure 2.  The simulation results of incident linearly polarized light with n=1 and NA=0.85. The axial shift distances of the vortex phase zone plate are: (a) |Δz|=10 μm; (c) |Δz|=15 μm; (e) |Δz| = 20 μm. (b), (d) and (f) are the corresponding yz cross-section distributions of the total intensity in (a), (b) and (c), respectively

    图 3  线偏振光 (a)~(c)和圆偏振光 (d)~(f)入射时的数值模拟结果,其中拓扑荷n = 1,轴向偏移距离|Δz|=10 μm,数值孔径NA=0.85。(a)、 (d)为聚焦光斑在xy截面上的光强分布; (b)、 (e)为聚焦光斑在一维x轴和y轴方向上的归一化光强分布; (c)、 (f)为聚焦场的三维强度等值面分布图,其中的等值面为I1 = 0.5ImaxI2 = 0.3Imax

    Figure 3.  The simulation results of linearly polarized light (a)−(c) and circularly polarized light (d)−(f) with n=1, |Δz|=10 μm and NA=0.85. (a), (d) are the xy cross-section distributions of total intensity; (b), (e) are the normalized intensity along x and y axis directions; (c), (f) are the 3D iso-surface plots of the total intensity with I1 = 0.5Imax, I2 = 0.3Imax

    图 4  圆偏振光入射时的相位分布图 (a)~(d) 及其对应的紧聚焦xy截面的光场强度分布 (e)~(h)。其中,数值孔径NA=0.85,|Δz|=20 μm涡旋波带片的拓扑荷数: (a), (e) n=1;(b), (f) n=2;(c), (g) n=3;(d), (h) n=4

    Figure 4.  (a)−(d) are the phase distributions of vortex phase zone plate, (e)−(h) are the corresponding xy cross-section distributions of light intensity in the tight focusing field illuminated by circularly polarized light, in which NA=0.85, |Δz|=20 μm and the topology charge: (a), (e) n=1; (b), (f) n=2; (c), (g) n=3; (d), (h) n=4

    图 5  实验光路示意图。其中:PHF为针孔滤波器;CL为准直镜;BS为分束棱镜;P为偏振片;SLM为空间光调制器;PM为平面反射镜

    Figure 5.  Schematic diagram of the optical path in experiment, where PHF is a pin hole filter, CL is a collimation lens, BS is a beam splitter, P is a polarizer, SLM is a spatial light modulator, PM is a plane mirror

    图 6  不同轴向距离的实验结果图。(a)、 (d)分别为轴向偏移|Δz|=10 μm和|Δz|=15 μm时的涡旋相位波带片的相位分布图; (b)、 (c)分别是±10 μm处xy截面的光场强度分布;图 (e)、 (f)分别是±15 μm处xy截面的光场强度分布图

    Figure 6.  The experimental results with different axial shift distances. (a), (d) are the vortex phase distributions with |Δz|=10 μm and |Δz|=15 μm; (b), (c) are the total intensity distributions on xy cross-section at 10 μm and −10 μm, respectively; (e), (f) are the total intensity distributions on xy cross-section at 15 μm and −15 μm, respectively

    图 7  不同拓扑荷数xy截面光场分布实验图。图 (a)、 (b)、 (c)、 (d)分别为n=1、n=2、n=3和n=4时的波带片的相位分布图; (e)、 (f)、 (g)、 (h)分别为 (a)、 (b)、 (c)、 (d)对应波带片调制后的聚焦场在xy截面的光场分布

    Figure 7.  The experimental results of the focusing distribution on xy cross-section with different topology charges. (a), (b), (c), (d) are the phase distributions of the zone plate with n=1, n=2, n=3 and n=4, respectively; (e), (f), (g), (h) are the corresponding experimental results for (a), (b), (c) and (d) after zone plate modulation, respectively

    图 8  中空环形光斑的暗斑大小随拓扑荷值的变化曲线图

    Figure 8.  The curve of the size of the dark spot of doughnut-shaped spot as a function of the topology charge n

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  • 收稿日期:  2022-03-08
  • 修回日期:  2022-04-06
  • 录用日期:  2022-06-28
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