Energy-filtered phase retrieval using the transport of intensity equation
Author(s) -
Vicki J. Keast,
M. J. Gladys,
Timothy C. Petersen,
Christian Dwyer,
Christoph T. Koch,
Thomas Haber,
Gerald Kothleitner
Publication year - 2011
Publication title -
applied physics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 442
eISSN - 1077-3118
pISSN - 0003-6951
DOI - 10.1063/1.3663572
Subject(s) - plasmon , scattering , phase (matter) , phase retrieval , intensity (physics) , optics , physics , computational physics , materials science , molecular physics , quantum mechanics , fourier transform
Energy-filtered imaging was combined with phase retrieval to study plasmon scattering contributions to electron phase shifts surrounding gold nanoparticles. Spectral windows with sufficient energy resolution to exclude plasmon scattering were used to measure through-focal intensity derivatives and retrieve phase maps via the transport of intensity equation. Phase excursions in the phase maps that included plasmon scattering were found to disagree with theory by at least an order of magnitude. This discrepancy was attributed to subtle particle instabilities under the electron beam, which lead to systematic errors in the retrieved phase maps
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