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我们在室温下测量采用反射差分光谱测量了r面蓝宝石衬底上生长的a面氧化锌的平面内光学各向异性。由于a面氧化锌为C2v对称性,我们观察到在平行c轴的方向和垂直于c轴的方向存在巨大的平面内光学各向异性。在带隙处观察到了非常尖锐的跃迁振荡信号,这个信号来源于偏振相关的能带移动。激子跃迁产生了尖锐的线形。谱线的拟合和微分光谱给出了偏振相关的带隙能量。垂直于c轴和平行于c轴方向上的各向异性应变产生了巨大的平面内光学各向异性。介电函数模型给出了拟合的结果,估计了带隙附近的偏振度。 相似文献
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We have measured the in-plane optical anisotropy (IPOA) of (1120) ZnO (a-plane) on (10]-2) sapphire (r-plane) by reflectance difference spectroscopy (RDS) at room temperature. Giant IPOA has been observed be- tween the light polarized direction parallel and perpendicular to the c axis of ZnO, since the symmetry of a-plane is C2v. A sharp resonance has been observed near the fundamental band gap, which is induced by the polarization- depend band gap shift. The sharp line shape is attributed to the exciton transition. The spectra fitting and differential spectra indicate the polarization-depend band energies. The giant IPOA is possible enhanced by anisotropy strain along and perpendicular to the c axis in the a-plane. 相似文献
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