TEM Contrast/fringes at Interface/edge between Two Materials
- Practical Electron Microscopy and Database -
- An Online Book -

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This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.
 

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Fresnel diffraction occurs at the interface between two materials with different densities. At underfocus a bright halo presents outside the area of greater density, while at overfocus a dark fringe appears there.

Fresnel fringes are produced along the edges of TEM objects when the objects are out of focus under a coherent illumination. For instance, the edge between the carbon film and vacuum, or the aperture edges in the TEM present such fringes.

 

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