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題名: | Tuning linear and nonlinear optical properties of wurtzite GaN by c-axial stress | 作者: | 郭光宇 Guo, Guang-Yu |
貢獻者: | 應物所 | 日期: | 2009 | 上傳時間: | 24-Jan-2014 | 摘要: | We study the linear and nonlinear optical properties of wurtzite GaN under c-axial stress field, using density functional theory calculations. The fully structural optimization at each c-axial strain was performed. The calculated dielectric functions show that tensile c-axial strain effectively improves the linear optical efficiency, especially for the band-edge transitions, and significantly increase the mobility of electrons in the conduction band. Second-order nonlinear optical susceptibilities show that the tensile c-axial strain will enhance the zero- and low-frequency nonlinear responses of GaN. The enhancement of the nonlinear optical property is explained by the reduction of the polarization of wurtzite GaN under tensile c-axial strains. Based on these findings, we propose a method for improving the electrical and optical properties of the crystal through imposing appropriate stress on the high symmetry crystalline directions. | 關聯: | Journal of physics. D, Applied physics, 42,185107 | 資料來源: | http://dx.doi.org/10.1088/0022-3727/42/18/185107 | 資料類型: | article | DOI: | http://dx.doi.org/10.1088/0022-3727/42/18/185107 |
Appears in Collections: | 期刊論文 |
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