Electron Holography of Electromagnetic Fields
Electron holography was originally proposed by Gabor130 as a means to compensate for the lens aberrations and improve the resolution of transmission electron microscopes (TEMs). Within the last decade dramatic improvements in coherent field-emission electron sources,440 and in TEM instrumentation, have allowed the promise of holography to come to fruition.451 Improvements in TEMs notwithstanding, it has been the application of holographic techniques and coherent-beam imaging to the investigation of magnetic and electric fields that has sparked the interest of materials scientists. Holography is a unique tool to probe phenomena in the microscopic world in that all the information about the object is contained in the hologram (both the amplitude and phase), whereas conventional microscopy records only the intensity. It is in this sensitivity to the phase that materials scientists find holography’s true potential.
KeywordsVortex Ferrite Helium Coherence GaAs
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