Title

Crystal coherence length effects on the infrared optical response of MgO thin films

Authors

Authors

J. F. Ihlefeld; J. C. Ginn; D. J. Shelton; V. Matias; M. A. Rodriguez; P. G. Kotula; J. F. Carroll; G. D. Boreman; P. G. Clem;M. B. Sinclair

Comments

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Abbreviated Journal Title

Appl. Phys. Lett.

Keywords

MAGNESIUM OXIDE; REFLECTANCE; SPECTROSCOPY; DISPERSION; SCATTERING; SPECTRA; Physics, Applied

Abstract

The role of crystal coherence length on the infrared optical response of MgO thin films was investigated with regard to Reststrahlen band photon-phonon coupling. Preferentially (001)-oriented sputtered and evaporated ion-beam assisted deposited thin films were prepared on silicon and annealed to vary film microstructure. Film crystalline coherence was characterized by x-ray diffraction line broadening and transmission electron microscopy. The infrared dielectric response revealed a strong dependence of dielectric resonance magnitude on crystalline coherence. Shifts to lower transverse optical phonon frequencies were observed with increased crystalline coherence. Increased optical phonon damping is attributed to increasing granularity and intergrain misorientation. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3515901]

Journal Title

Applied Physics Letters

Volume

97

Issue/Number

19

Publication Date

1-1-2010

Document Type

Article

Language

English

First Page

3

WOS Identifier

WOS:000284169900029

ISSN

0003-6951

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