Theoretical Studies on Optical Phonon and Surface Phonon Polariton of Wurtzite AlInN Alloys

Abstract:

The lattice vibrational properties of wurtzite ternary mixed crystal aluminium indium nitride (Al_xIn_1-xN) are investigated thoroughly using modified random element iso-displacement (MREI) model and Born-Huang procedure. MREI model, which considers the nearest neighbour interactions, is used to predict the composition dependence of longitudinal and transverse optical phonon frequencies. For Al_xIn_1-xN alloy, oscillator strength of its weak mode is sufficiently significant for composition range of 0 < x < 0.4. As a result, Al_xIn_1-xN alloy is deduced to exhibit mixed-mode behaviour. Finally, the calculated dielectric functions for the entire composition range (0 < x < 1) are used to simulate the surface phonon polariton characteristics of the Al_xIn_1-xN alloy.

• Periodical: Advanced Materials Research (Volume 1107)
• Pages: 565-570
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1107.565
• Online since: June 2015
• Authors: Pauline Yew, Lee Sai Cheong, Sha Shiong Ng, Yoon Tiem Leong, Haslan Abu Hassan
• Keywords: MREI Model, Phonon, Surface Phonon Polariton, Wurtzite AlInN

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