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Comparison of Optical Activity and Faraday Rotation in Crystalline Si0 2
Author(s) -
van den Keybus P.,
Grevendonk W.
Publication year - 1986
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.2221360231
Subject(s) - faraday effect , formalism (music) , wavelength , physics , optical rotation , rotational symmetry , optics , mathematical analysis , mathematics , quantum mechanics , magnetic field , mechanics , art , musical , visual arts
Optical activity (OA) and Faraday rotation (FR) in SiO 2 are compared from both a theoretical and an experimental points of view. A simultaneous derivation of the one‐oscillator formulas of FR and OA is presented. For OA this formula is extended to a semi‐classical expression, in analogy with earlier derivations of FR formulae. Starting from dispersion relations for crystals without inversion symmetry, it is possible to derive the OA formula, obtained earlier by Natori with the Kubo‐Greenwood formalism. Within the limits of accuracy and in the wavelength range 300 to 700 nm the experimental curves of OA and FR differ by a numerical factor only. Nevertheless the gap energies, obtained by fitting these curves with OA and FR formulas are different. The energy E g FR= 9 eV is believed to correspond to the real direct band gap.