Infrared Study of Sapphire α-Al2O3 by Small-Angle Oblique-Incidence Reflectometry

概要

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Infrared properties of the multimode polar optical phonons in sapphire have been studied by the small-angle oblique-incidence reflectometry (SAOIR) using the a- and c-face of the crystal. It is found that the reststrahlen reflection accompanies the total reflection due to Snell's law and the null reflection due to Brewster's law in the form of line structures at frequencies very close to longitudinal optical (LO) phonons. The analysis of the observations in terms of Gervais and Piriou's four-parameter semi-quantum oscillator model yields the frequencies and damping energies of all modes of the polar optical phonons. In addition, three weak bands which are allowed for E||c and ascribed to the multiphonon absorptions are observed on the wing of the reststrahlen band of an A2u mode.
社団法人日本物理学会の論文
2012-02-00