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The Dielectric Function and Reflectivity in KDP‐Type Ferroelectrics
Author(s) -
Wesselinowa J. M.
Publication year - 1990
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.2221600230
Subject(s) - refractive index , reflectivity , dielectric function , dielectric , materials science , type (biology) , optics , kramers–kronig relations , function (biology) , energy (signal processing) , index (typography) , condensed matter physics , absorption (acoustics) , analytical chemistry (journal) , physics , chemistry , quantum mechanics , optoelectronics , evolutionary biology , biology , ecology , chromatography , world wide web , computer science
A Green function technique is developed to study the real and imaginary parts of the dielectric function ε( k , E ) for KDP‐type ferroelectrics below and above T c . The dependence of the numerically calculated ε( k , E ) on energy E and temperature T is discussed. Using the Kramers‐Kronig analysis the refractive index n , the absorption index χ and reflectivity R are obtained for T = 120 and 300 K and are found to be in very good agreement with the experimental data for KDP.