Optical properties of single‐crystal Gd3Ga5O12 from the infrared to ultraviolet. Issue 10 (17th June 2015)

• Record Type: Journal Article
• Authors: Ghimire, Kiran; Haneef, Hamna F.; Collins, Robert W.; Podraza, Nikolas J.
• Is Part Of: Physica status solidi. Volume 252:Issue 10(2015:Oct.)
• Page Start: 2191
• Page End: 2198
• Publication Date: 2015-06-17
• Subjects: Solid state physics -- Periodicals; Solids -- Periodicals; Atomic structure -- Periodicals; 530.41
• DOI: 10.1002/pssb.201552115
• Languages: English
• ISSNs: 0370-1972

Abstract

<abstract abstract-type="main" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <sec id="pssb201552115-sec-0001" sec-type="section"> <p>Optical properties of commercially available gadolinium gallium garnet (Gd₃Ga₅O₁₂) single crystals have been studied over a spectral range from 0.034 to 5.887 eV 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 (<italic>ϵ</italic> = <italic>ϵ</italic>₁ + i<italic>ϵ</italic>₂) spectra from 0.034 to 5.887 eV 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 <italic>ϵ</italic> for Gd₃Ga₅O₁₂ indicates a direct band gap at 5.66 ± 0.01 eV, sub band gap absorption features from 3.95 to 5.06 eV, and nine transverse optical phonon modes at 288, 313, 329, 361, 370, 467, 577, 609, and 670 cm⁻¹ and longitudinal optical phonon modes at 288, 327, 338, 370, 461, 490, 592, 663, and 707 cm⁻¹.</p> </sec> </abstract>