Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7988128 | Solid State Communications | 2016 | 4 Pages |
Abstract
We report on the characterization of the intrinsic, anisotropic, dielectric properties of wurtzite gallium nitride in the spectral range of 0.5-11 THz, using terahertz time-domain spectroscopy. The ordinary (εËâ¥) and extraordinary (εËâ¥) components of the complex dielectric function were determined experimentally for a semi-insulating, m-plane gallium nitride single crystal, providing measurements of the refractive indices (nâ¥,â¥) and absorption coefficients (αâ¥,â¥). These material parameters were successfully modeled by considering the contribution of the optical phonon modes, measured using Raman spectroscopy, to the dielectric function, giving values for the relative static dielectric constants of ε0â¥=9.22±0.02 and ε0â¥=10.32±0.03 for wurtzite gallium nitride.
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Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
M.T. Hibberd, V. Frey, B.F. Spencer, P.W. Mitchell, P. Dawson, M.J. Kappers, R.A. Oliver, C.J. Humphreys, D.M. Graham,