Electron holography on Fraunhofer diffraction
| Autor: | Ken Harada, Yoshimasa A. Ono, Tetsuji Kodama, Daisuke Shindo, Tetsuya Akashi, Keiko Shimada, Kodai Niitsu, Shigeo Mori, Hiroyuki Shinada |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
electron holography
genetic structures Plane wave Phase (waves) Holography Physics::Optics 02 engineering and technology Fraunhofer diffraction 01 natural sciences Article Electron holography law.invention symbols.namesake Optics Structural Biology law Condensed Matter::Superconductivity 0103 physical sciences Radiology Nuclear Medicine and imaging double slit phase distribution Instrumentation 010302 applied physics Physics business.industry interferometry 021001 nanoscience & nanotechnology eye diseases Reciprocal lattice Interferometry Amplitude biological sciences symbols bacteria sense organs 0210 nano-technology business |
| Zdroj: | Microscopy |
| ISSN: | 2050-5701 2050-5698 |
| Popis: | Fraunhofer electron holography using an asymmetric double slit was realized. A Fraunhofer diffraction wave from the wider slit was recorded in a hologram interfered with a plane wave from the narrower slit. The phase distribution of the diffraction wave was succeeded in reconstructing as a step pattern of π radians. Electron holography in Fraunhofer region was realized by using an asymmetric double slit. A Fraunhofer diffraction wave from a wider slit worked as an objective wave interfered with a plane wave from a narrower slit as a reference wave under the pre-Fraunhofer condition and recorded as a hologram. Here, the pre-Fraunhofer condition means that the following conditions are simultaneously satisfied: single-slit observations are performed under the Fraunhofer condition and the double-slit observations are performed under the Fresnel condition. Amplitude and phase distributions of the Fraunhofer diffraction wave were reconstructed from the hologram by the Fourier transform reconstruction method. The reconstructed amplitude and phase images corresponded to Fraunhofer diffraction patterns; in particular, the phase steps of π at each band pattern in the phase image were confirmed. We hope that the developed Fraunhofer electron holography can be extended to a direct phase detection method in the reciprocal space. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|