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

CORC > 上海光学精密机械研究所 > 中国科学院上海光学精密机械研究所 > 高功率激光物理国家实验室

	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
刊名	物理学报
	2015
卷号	64 期号:24 页码:244201
其他题名	Ptychographic iterative engine with the incoherent illumination
通讯作者	Yu Wei, School of Science, Jiangnan University, Wuxi, Jiangsu 214122, China. ; He Xiaoliang, School of Science, Jiangnan University, Wuxi, Jiangsu 214122, China. ; Liu Cheng, School of Science, Jiangnan University, Wuxi, Jiangsu 214122, China. ; Zhu Jianqiang, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China.
中文摘要	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.
英文摘要	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.
收录类别	SCI
语种	中文
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.siom.ac.cn/handle/181231/14005]
专题	上海光学精密机械研究所_高功率激光物理国家实验室
作者单位	1.余伟, 江南大学理学院, 无锡, 江苏 214122, 中国. 2.何小亮, 江南大学理学院, 无锡, 江苏 214122, 中国. 3.刘诚, 江南大学理学院, 无锡, 江苏 214122, 中国. 4.朱健强, 中国科学院上海光学精密机械研究所, 上海 201800, 中国.
推荐引用方式 GB/T 7714	余伟,何小亮,刘诚,等. 非相干照明条件下的ptychographic iterative engine成像技术[J]. 物理学报,2015,64(24):244201.
APA	余伟,何小亮,刘诚,&朱健强.(2015).非相干照明条件下的ptychographic iterative engine成像技术.物理学报,64(24),244201.
MLA	余伟,et al."非相干照明条件下的ptychographic iterative engine成像技术".物理学报 64.24(2015):244201.