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Raman tensor determination of transparent uniaxial crystals and their thin films—a-plane GaN as exemplary case
Applied Physics Letters ( IF 4 ) Pub Date : 2021-09-23 , DOI: 10.1063/5.0060198 R. Hildebrandt 1 , C. Sturm 1 , M. Wieneke 2 , A. Dadgar 2 , M. Grundmann 1
Applied Physics Letters ( IF 4 ) Pub Date : 2021-09-23 , DOI: 10.1063/5.0060198 R. Hildebrandt 1 , C. Sturm 1 , M. Wieneke 2 , A. Dadgar 2 , M. Grundmann 1
Affiliation
The classical Raman tensor approach does not work for optically anisotropic materials in general. For the transparency regime, this can be circumvented by using an effective Raman tensor that considers the material's birefringence. In the specific case of an uniaxial crystal with in-plane orientation of principal axis, this effective Raman tensor is similar to the classical one, except for an additional phase factor for each tensor element. This phase is dependent on the sample thickness, which is demonstrated here experimentally via polarization resolved Raman scattering of a-plane GaN thin films. The experimental observations coincide very well with our model predictions.
中文翻译:
透明单轴晶体及其薄膜的拉曼张量测定——以 a 面 GaN 为例
经典的拉曼张量方法通常不适用于光学各向异性材料。对于透明度机制,这可以通过使用考虑材料双折射的有效拉曼张量来规避。在具有主轴面内取向的单轴晶体的特定情况下,这种有效拉曼张量类似于经典拉曼张量,除了每个张量元素的附加相位因子。该相位取决于样品厚度,这里通过 a 面 GaN 薄膜的偏振分辨拉曼散射实验证明了这一点。实验观察结果与我们的模型预测非常吻合。
更新日期:2021-09-24
中文翻译:
透明单轴晶体及其薄膜的拉曼张量测定——以 a 面 GaN 为例
经典的拉曼张量方法通常不适用于光学各向异性材料。对于透明度机制,这可以通过使用考虑材料双折射的有效拉曼张量来规避。在具有主轴面内取向的单轴晶体的特定情况下,这种有效拉曼张量类似于经典拉曼张量,除了每个张量元素的附加相位因子。该相位取决于样品厚度,这里通过 a 面 GaN 薄膜的偏振分辨拉曼散射实验证明了这一点。实验观察结果与我们的模型预测非常吻合。