Bulk plasmon-phonon polaritons in n-GaN

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Abstract

We studied theoretically and experimentally plasmon-phonon polaritons and longitudinal plasmon-phonon oscillations in n-GaN epitaxial layers. The studies were carried out on the epitaxial layers with various doping levels. Simulation of the reflectivity spectra and dispersion relations of plasmon-phonon polaritons was performed in a wide frequency range. Reflectivity spectra transformation associated with phonon damping and electron relaxation processes has been revealed. Experimental studies of the reflectivity spectra have been performed in the spectral range of 8-80 meV. The experimental spectra are well fitted by the simulated ones. Results of the study can be used for contactless determination of the electron concentration and mobility in GaN epitaxal layers.

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Orlov, E. Y., Melentev, G. A., Shalygin, V. A., & Suihkonen, S. (2017). Bulk plasmon-phonon polaritons in n-GaN. In Journal of Physics: Conference Series (Vol. 816). Institute of Physics Publishing. https://doi.org/10.1088/1742-6596/816/1/012004

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