期刊
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
卷 252, 期 10, 页码 2191-2198出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssb.201552115
关键词
dielectric function; garnets; Gd3Ga5O12; optical phonons; spectroscopic ellipsometry
资金
- University of Toledo
Optical properties of commercially available gadolinium gallium garnet (Gd3Ga5O12) single crystals have been studied over a spectral range from 0.034 to 5.887eV using spectroscopic ellipsometry and transmittance measurements via a near infrared to ultraviolet spectral range multichannel ellipsometer and a Fourier transform infrared (FTIR) ellipsometer. The complex dielectric function (E=E-1+iE(2)) spectra from 0.034 to 5.887eV have been determined. Transmission measurements have been performed to more accurately extract the absorption coefficient near the band edge and identify sub band gap features. Analysis of E for Gd3Ga5O12 indicates a direct band gap at 5.66 +/- 0.01eV, sub band gap absorption features from 3.95 to 5.06eV, and nine transverse optical phonon modes at 288, 313, 329, 361, 370, 467, 577, 609, and 670cm(-1) and longitudinal optical phonon modes at 288, 327, 338, 370, 461, 490, 592, 663, and 707cm(-1).
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