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Dispersion Relations and Phase Retrieval in Infrared Reflection Spectra Analysis

Volume 55, Number 6 (June 2001) Page 774-780

Brun, Jean-Francois; de Sousa Meneses, Domingos; Rousseau, Benoit; Echegut, Patrick

A variant of the maximum entropy method (MEM), recently developed by Vartiainen et al., is proposed for infrared reflectivity spectra analysis. The procedure uses a new interpolation algorithm to estimate the so-called error phase that is the key step of the model. As shown by several examples, this approach is a good alternative to the well known Kramers-Kronig phase retrieval relation for the determination of the dielectric function and proved to be particularly efficient in dealing with conductor materials.