Raman tensor determination of transparent uniaxial crystals and their thin films—a-plane GaN as exemplary case

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 orien...

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Bibliographic Details
Published in:Applied physics letters 2021-09, Vol.119 (12), p.121109
Main Authors: Hildebrandt, R., Sturm, C., Wieneke, M., Dadgar, A., Grundmann, M.
Format: Article
Language:English
Subjects:
Applied physics
Birefringence
Crystal optics
Crystal structure
Mathematical analysis
Raman spectra
Tensors
Thin films
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Summary: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.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0060198