scholarly journals Experimental demonstration of three-dimensional high energy electron radiography

2021 ◽  
Vol 70 (18) ◽  
pp. 184204-184204
Author(s):  
Li Shuang-Shuang ◽  
◽  
Zhao Quan-Tang ◽  
Cao Shu-Chun ◽  
Ran Zhao-Hui ◽  
...  
Keyword(s):  
Three Dimensional ◽  
High Energy ◽  
Energy Electron ◽  
Experimental Demonstration ◽  
High Energy Electron

scholarly journals Three-Dimensional High-Energy Electron Radiography Method for Static Mesoscale Samples Diagnostics

2019 ◽  
Vol 9 (18) ◽  
pp. 3764
Author(s):  
Quantang Zhao ◽  
Yuanyuan Ma ◽  
Jiahao Xiao ◽  
Shuchun Cao ◽  
Xiaokang Shen ◽  
...  
Keyword(s):  
Three Dimensional ◽  
High Energy ◽  
Energy Electron ◽  
New Method ◽  
Reconstruction Method ◽  
High Energy Electron ◽  
Spherical Sample ◽  
Internal Structures ◽  
Dimensional Reconstruction ◽  
Application Potential

In this paper, we propose a new method for static mesoscale sample diagnosis using three-dimensional radiography with high-energy electron radiography (HEER). The principle of three-dimensional high-energy electron radiography (TDHEER) is elucidated, and the feasibility of this method is confirmed by start-to-end simulation results. TDHEER is realized by combining HEER with the three-dimensional reconstruction method, by which more information about the samples can be attained, especially regarding the samples’ internal structures. With our study, the internal structures and the three-dimensional positions of the spherical sample are determined with a ~3 μm resolution. We believe that this new method enhances the HEER diagnostic capability and extends its application potential in mesoscale sciences.

Kinematical Analysis of the Evolution of Reflection High Energy Electron Diffraction Patterns of Quantum Dot Heterostructures: Correlation with Strain and Anisotropy

2006 ◽  
Vol 924 ◽  
Author(s):  
Andrea Feltrin ◽  
Alexandre Freundlich
Keyword(s):  
Quantum Dots ◽  
Electron Diffraction ◽  
Quantum Dot ◽  
Three Dimensional ◽  
High Energy ◽  
Image Features ◽  
Energy Electron ◽  
Clear Correlation ◽  
High Energy Electron ◽  
Strain Anisotropy

ABSTRACTThe strain distributions and of reflection high energy electron diffraction (RHEED) patterns of uncapped pyramidal shape InAs Stranski-Krastanov quantum dots fabricated on GaAs(001) substrate are investigated theoretically. The three dimensional strain anisotropy is computed with an atomistic elasticity approach, using inter-atomic Keating potentials and the strain energy is minimized using the conjugate gradient numerical method. RHEED images are predicted in the framework of the kinematical theory, by taking into account the refraction of the electron beam at the quantum dot/vacuum interface. Clear correlation between RHEED image features and quantum dot structural properties is established. The study stresses the potential of RHEED for future experimental real-time (during growth) detections and deciphering of strain anisotropies in quantum dots.

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