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非相干照明条件下的ptychographic iterative engine成像技术

余伟 何小亮 刘诚 朱健强

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非相干照明条件下的ptychographic iterative engine成像技术

余伟, 何小亮, 刘诚, 朱健强

Ptychographic iterative engine with the incoherent illumination

Yu Wei, He Xiao-Liang, Liu-Cheng, Zhu Jian-Qiang
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  • 在传统多波长相干衍射成像理论的基础上提出适用于 X-射线和电子束等非相干光源照明成像的改进多波长ptychographic iterative engine 方法, 同时将小孔形状和照明光谱信息用于叠代计算, 可以在非相干照明条件下精确重建出物体的强度透射像和相位透射像, 并对光源带宽对重建精度的影响进行了分析, 对于解决如何在非相干照明条件下对大尺寸物体进行精确相位成像的问题具有较好的科研和实用价值.
    Ptychographic iterative engine (PIE) is an ideal phase microscopic method for imaging with short wavelength including X-ray and electron beam. The traditional PIE algorithm requires a purely coherent illumination. Since the coherencies of X-ray and electron beam are always much lower than coherency of the laser, it is greatly important to develop new algorithm for enhancing the capability of PIE in handling the incoherence of the illumination. A method, named polyCDI (coherent diffraction imaging), which can generate clear reconstruction with the illumination of partial coherency, was proposed recently, however due to the use of tiny pinhole in the data acquisition the view field of the reconstructed image is limited. The polyPIE algorithm, which combines the principles of polyCDI with PIE, can realize the imaging of large object with partially coherent illumination. In this paper, an improved polyPIE algorithm is developed to realize the high-resolution phase imaging under incoherent illumination by bringing the shape of the illuminating pinhole and the spectral distribution of the light source into the iterative computation. The image of the object and the illuminating probe are reconstructed for each spectral component, and the shape of the pinhole forming the illumination is used as the same spatial constraint for all the reconstructed probes on the pinhole plane. With this method a very high convergence speed and reconstruction accuracy as well as a wide view field can be achieved. This method can find many applications in the imaging with X-ray and electron beam, which are of low coherence in most of cases. The influence of the spectral width on reconstruction accuracy is also analyzed by imaging the object with illuminations of different spectral widths. It is found that the improved polyPIE algorithm can accurately reconstruct the phase and modulus images of the object when the width of the incoherent illuminating source is smaller than 10% of the central wavelength, otherwise, the convergence speed and reconstruction accuracy will become remarkably lower. By bringing the shape of the pinhole into the iterative computation, the relevance of the reconstructed illuminating probes of different spectral components is used and accordingly the reconstruction speed can be obviously accelerated. The feasibility of this suggested method is verified by a series of numerical simulations.
      通信作者: 刘诚, cheng.liu@hotmail.co.uk
    • 基金项目: 江苏省自然科学基金(批准号: BK2012548)和江南大学校基金资助的课题.
      Corresponding author: Liu-Cheng, cheng.liu@hotmail.co.uk
    • Funds: Project supported by the Natural Science Foundation of Jiangsu Province, China (Grant No. BK2012548) and the Funds from Jiannan Univeristy, China.
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    Fienup J R 1982 Appl. Opt. 21 2578

    [2]

    Williams G J, Quiney H M, Dhal B B, Tran C Q, Nugent K A, Peele A G, Paterson D, de Jonge M D 2006 Phys. Rev. Lett. 97 025506

    [3]

    Miao J, Charalambous P, Kirz J, Sayre D 1999 Nature 400 342

    [4]

    Rodenburg J M, Faulkner H M L 2004 Appl. Phys. Lett. 85 4795

    [5]

    Faulkner H M A, Rodenburg J M 2004 Phys. Rev. Lett. 93 023903

    [6]

    Elser V 2003 Opt. Soc. Am. A 20 40

    [7]

    Maiden M A, Rodenburg J M 2009 Ultramicroscopy 109 1256

    [8]

    Claus D, Maiden M A, Zhang F, Sweeney F, Humphry M, Rodenburg J 2011 SPIE 8001 800109

    [9]

    Rodenburg J M, Hurst A C, Cullis A G, Dobson B R, Pfeiffer F, Bunk O, David C, Jefimovs K, Johnson I 2007 Phys. Rev. Lett. 98 034801

    [10]

    Rodenburg J M 2008 Adv. Imaging. Electron. Phys. 150 87

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    Fienup J R 1978 Opt. Lett. 31 27

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    Spence C H, Weierstall U, Howells M 2004 Ultramicroscopy 101 149

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    Liu C, Pan X C, Zhu J Q 2013 Acta Phys. Sin. 62 184204 (in Chinese) [刘诚, 潘星辰, 朱健强 2013 物理学报 62 184204]

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    He J, Liu C, Gao S M, Wang J C, Wang Y K, Zhu J Q 2014 Acta Opt. Sin. 34 0511008 (in Chinese) [何靖, 刘诚, 高淑梅, 王继成, 王跃科, 朱健强 2014 光学学报 34 0511008]

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    Wang Y X, Yun W B, Jacobsen C 2003 Nature 424 50

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    Thibault P, Menzel A 2013 Nature 494 68

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    Claus D, Robinson D J, Chetwynd D G, Shuo Y, Pike W T, Garcia J, Rodenburg J M 2013 J. Opt. 15 035702

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出版历程
  • 收稿日期:  2015-07-05
  • 修回日期:  2015-08-17
  • 刊出日期:  2015-12-05

非相干照明条件下的ptychographic iterative engine成像技术

  • 1. 江南大学理学院, 无锡 214122;
  • 2. 中国科学院上海光学精密机械研究所, 上海 201800
  • 通信作者: 刘诚, cheng.liu@hotmail.co.uk
    基金项目: 江苏省自然科学基金(批准号: BK2012548)和江南大学校基金资助的课题.

摘要: 在传统多波长相干衍射成像理论的基础上提出适用于 X-射线和电子束等非相干光源照明成像的改进多波长ptychographic iterative engine 方法, 同时将小孔形状和照明光谱信息用于叠代计算, 可以在非相干照明条件下精确重建出物体的强度透射像和相位透射像, 并对光源带宽对重建精度的影响进行了分析, 对于解决如何在非相干照明条件下对大尺寸物体进行精确相位成像的问题具有较好的科研和实用价值.

English Abstract

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