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The strain field of dislocations shifts the polarization plane of light. A specimen (with two polished surfaces) between almost crossed polarizers thus transmits more or less light than the bulk around defects | ||
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The picture shows two edge dislocations in GaAs parallel to the optical axis. The contrast is directly proportional to the sign and magnitude of the strain field (or stress-field, which is shown for comparison) | ||
Stress Field of an Edge Dislocation
© H. Föll
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