Brummer, GordieNothern, DenisNikiforov, A. YuMoustakas, T.D.2023-10-172023-10-172015-06-01G. Brummer, D. Nothern, A.Y. Nikiforov, T.D. Moustakas. 2015. "Deep ultraviolet distributed Bragg reflectors based on graded composition AlGaN alloys" Applied Physics Letters, Volume 106, Issue 22. https://doi.org/10.1063/1.49222150003-69511077-3118https://hdl.handle.net/2144/47022Distributed Bragg reflectors (DBRs) with peak reflectivity at approximately 280 nm, based on compositionally graded AlxGa1−xN alloys, were grown on 6H-SiC substrates by plasma-assisted molecular beam epitaxy. DBRs with square, sinusoidal, triangular, and sawtooth composition profiles were designed with the transfer matrix method. The crystal structure of these DBRs was studied with high-resolution x-ray diffraction of the (1¯015) reciprocal lattice point. The periodicity of the DBR profiles was confirmed with cross-sectional Z-contrast scanning transmission electron microscopy. The peak reflectance of these DBRs with 15.5 periods varies from 77% to 56% with corresponding full width at half maximum of 17–14 nm. Coupled mode analysis was used to explain the dependence of the reflectivity characteristics on the profile of the graded composition.221107-221107enCopyright 2015 AIP Publishing LLC.Physical sciencesEngineeringTechnologyApplied physicsArticle2023-02-2410.1063/1.49222150000-0002-7854-8397 (Nothern, Denis)698371