电子全息实验中参考波相位变化对物波相位测量的影响  

Effect of reference wave phase on phase measurement in electron holography experiments

作　　者：杨阳[1] 姚湲[1] 王志宏[1] Habermeier H U 禹日成[1] 

机构地区：[1]中国科学院物理研究所,北京100190 [2]Max-Planck-Institute for Solid State Research, Heisenbergstrasse 1, D-70569, Stuttgart, Germany

出　　处：《电子显微学报》2012年第6期498-502,共5页Journal of Chinese Electron Microscopy Society

基　　金：国家科技部纳米专项资助(No.2012CB932302);国家自然科学基金资助项目(No.10974235,No.50921091)

摘　　要：本文根据电子全息的成像原理,分析了在测量La0.5Ca0.5MnO3(LCMO)平均内势的实验中,出现全息相位图中样品两部分的相位分别高于和低于真空区相位的现象,并进一步研究了参考波的相位变化对物波相位测量的影响。In experiment of electron holography,the phenomenon that the simultaneous existence of plus and minus phases in two parts of La0.5Ca0.5MnO3 cross sectional sample,respectively,has been analyzed according to the electron holographic principle.We pointed out that this phenomenon was caused by phase disturbance of the reference wave which would influence the reconstructed phase diagram and distort the measured mean inner potential.We further studied the effect of such phase disturbance on the phase measurements in electron holography experiments and discussed several possible cases which have been confirmed by the experimental results.Our study indicates that the phenomena mentioned here are complex and sometimes results in a wrong understanding of the acquired phase diagram in electron holography experiments.It should be careful to distinguish the hologram formation status of the experiment to avoid such mistakes.

关 键 词：电子全息 参考波相位 透射电镜 截面样品 

分 类 号：O438.1[机械工程—光学工程]