Dielectric Response of Nonpolar a-plane (11(2)over-bar0) ZnO Crystals in the Terahertz Frequency
- Authors
- Jang, Soohwan; Parke, Jaehun; Kim, Seongheun; Baik, Kwang Hyeon
- Issue Date
- Nov-2016
- Publisher
- AMER SCIENTIFIC PUBLISHERS
- Keywords
- Terahertz; Time-Domain Spectroscopy; ZnO; Birefringence
- Citation
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.16, no.11, pp.11599 - 11602
- Journal Title
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
- Volume
- 16
- Number
- 11
- Start Page
- 11599
- End Page
- 11602
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/7207
- DOI
- 10.1166/jnn.2016.13558
- ISSN
- 1533-4880
- Abstract
- We investigated the dielectric response of nonpolar a-plane (11 (2) over bar0) ZnO (a-ZnO) bulk crystals in the terahertz (THz) frequency using femto-second THz time-domain spectroscopy. The peak amplitude of the transmitted output pulse for nonpolar a-ZnO crystal decreased down to about 25% of c-plane ZnO (c-ZnO), showing strong absorptions in a-ZnO when compared with polar c-ZnO. While the polar c-ZnO did not show any azimuthal angle dependence, nonpolar a-ZnO crystals exhibited significant variation as a function of azimuthal angle, presumably due to the birefringence in a-ZnO crystal. We believe that the discrepancy in the refractive index originates from the difference of the transverse-optical and the longitudinal optical phonon splitting between the optical phonon branches.
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