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In-Plane Optical Anisotropies of AlxGa1−xN Films in Their Regions of Transparency

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Abstract

GaN, AlxGa1−xN, and AlN layers exhibit interference oscillations and bandgap-related features in their reflectance-difference (-anisotropy) (RD/RA) spectra. We concentrate on the interpretation of interference-related data, providing a general expression for these optical anisotropics and discussing mechanisms that originate in the layers themselves. These include anisotropic strain in the plane of the layer, a tilt of the c axis with respect to the surface normal, and non-normal-incidence illumination. We estimate the magnitudes of these contributions, and show that they are consistent with those observed. In principle these contributions can be separated by their different azimuthal dependences. The complex pattern of the data for AlxGa1−xN and AlN indicate that contributions from several layers are present.

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Author information

Author notes

  1. U. Rossow

    Present address: Now at the Department of Physics, University of Ilmenau, Ilmenau, Germany

  2. H. Liu

    Present address: Hewlett-Packard, San Jose, CA, 95131, USA

Authors and Affiliations

  1. Department of Physics, North Carolina State University, Raleigh, NC, 27695-8202, USA

    U. Rossow & D. E. Aspnes

  2. Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC, 27695-7907, USA

    N. V. Edwards, M. D. Bremser, R. S. Kern, R. F. Davis & D. E. Aspnes

  3. Emcore, 35 Elizabeth St., Somerset, NJ, 08873, USA

    H. Liu

Authors
  1. U. Rossow
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  2. N. V. Edwards
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  3. M. D. Bremser
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  4. R. S. Kern
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  5. H. Liu
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  6. R. F. Davis
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  7. D. E. Aspnes
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Correspondence to D. E. Aspnes.

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Rossow, U., Edwards, N.V., Bremser, M.D. et al. In-Plane Optical Anisotropies of AlxGa1−xN Films in Their Regions of Transparency. MRS Online Proceedings Library 449, 835–840 (1996). https://doi.org/10.1557/PROC-449-835

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  • DOI: https://doi.org/10.1557/PROC-449-835

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