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Mainly on the Fresnel Mode in Lorentz Microscopy
Author(s) -
Guigay J. P.,
Wade R. H.
Publication year - 1968
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19680290230
Subject(s) - fresnel diffraction , fresnel integral , diffraction , optics , fresnel number , plane (geometry) , physics , lorentz transformation , phase (matter) , kirchhoff's diffraction formula , mathematics , geometry , classical mechanics , quantum mechanics
We consider the problem of the determination of magnetic structures by transmission electron microscopy. A stationary phase approximation to the Kirchoff diffraction integral yields a criterion for the validity of geometrical optics in calculating image intensity distributions at any diffraction plane. Our criterion is particularly useful for the Fresnel diffraction case since the usual criterion Δφ ≫ h c / e [1] is strictly valid only for the Fraunhofer diffraction condition.