Optical losses in c-plane (0001) GaN ridge waveguides, containing Mg-doped layers, were measured at 1064 nm, using the Fabry-Perot method. The losses increase linearly with the modal content of the p-layer, indicating that the absorption in these waveguides is dominated by p-layer absorption. The p-layer absorption is strongly anisotropic with E⊥c losses 4 times higher than E∥c. The absorption is temperature independent between 10 °C and 60 °C, supporting the possibility that it is related to Mg-bound holes.
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Research Article| July 10 2017
Optical losses in p-type layers of GaN ridge waveguides in the IR region
Ohad Westreich, Moti Katz, Gil Atar, Yossi Paltiel, Noam Sicron; Optical losses in p-type layers of GaN ridge waveguides in the IR region. Appl. Phys. Lett. 10 July 2017; 111 (2): 022103. https://doi.org/10.1063/1.4992103
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