Crystal coherence length effects on the infrared optical response of MgO thin films.
- University of Central Florida, Orlando, FL
- Los Alamos National Laboratory, Los Alamos, NM
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.
- Research Organization:
- Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 1021614
- Report Number(s):
- SAND2010-4979C; TRN: US201117%%208
- Resource Relation:
- Conference: Proposed for presentation at the Electronic Materials and Applications 2011 held January 19-21, 2011 in Orlando, FL.
- Country of Publication:
- United States
- Language:
- English
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