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Optical Constants of Al x Ga 1—x N: Modeling over a Wide Spectral Range
Author(s) -
Djurišić A.B.,
Li E.H.
Publication year - 1999
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/(sici)1521-3951(199911)216:1<199::aid-pssb199>3.0.co;2-x
Subject(s) - range (aeronautics) , refractive index , function (biology) , gaussian , dielectric function , computational physics , hexagonal crystal system , dielectric , optics , spectral function , materials science , physics , condensed matter physics , chemistry , optoelectronics , quantum mechanics , crystallography , evolutionary biology , composite material , biology
Abstract The optical constants of Al x Ga 1— x N have been modeled over a wide spectral range (up to 10 eV) and for all compositions 0 ≤ x ≤ 1. The employed model is the modified Adachi model for the dielectric function of hexagonal materials which utilizes an adjustable broadening function instead of the conventional Lorentzian one. The broadening function can vary over a range of functions including Lorentzian and Gaussian, enabling the model to deal with inhomogeneous broadening. Excellent agreement with the experimental data is obtained for all compositions. Obtained relative rms errors for all individual compositions are below 1.5% for the real part and below 2.5% for the imaginary part of the index of refraction.