Production of micro X-ray vortex beam with variable orbital angular momentum and its application to magnetic imaging and absorption spectroscopy

Research Project

Project/Area Number	26600143
Research Category	Grant-in-Aid for Challenging Exploratory Research
Allocation Type	Multi-year Fund
Research Field	Quantum beam science
Research Institution	Osaka University
Principal Investigator	Takahashi Yukio 大阪大学, 工学(系)研究科(研究院), 准教授 (00415217)
Project Period (FY)	2014-04-01 – 2016-03-31
Project Status	Completed (Fiscal Year 2015)
Budget Amount *help	¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000) Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000) Fiscal Year 2014: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Keywords	量子ビーム科学 / 量子ビーム
Outline of Final Research Achievements	We experimentally visualized nanoscale dislocation strain fields in a thick silicon single crystal by Bragg X-ray ptychography. We found that the X-ray microbeam carrying orbital angular momentum is selectively produced by coherent Bragg diffraction from dislocation singularities in crystals. This work not only provides us with a tool for characterizing dislocation strain fields buried within extended crystals but also opens up new scientific opportunities in spectroscopy.