Photoelastic properties of zinc-blende (AlGa)N in the UV: picosecond ultrasonic studies

Whale, Josh and Akimov, Andrey V. and Novikov, Sergei V. and Mellor, Christopher J. and Kent, Anthony J. (2018) Photoelastic properties of zinc-blende (AlGa)N in the UV: picosecond ultrasonic studies. Physical Review Materials, 2 (3). 034606. ISSN 2475-9953

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Abstract

Picosecond ultrasonics was used to study the photoelastic properties of zinc-blende (cubic) c-AlₓGa₁₋ₓN with x around 0.5 The velocities for longitudinal sound in the alloys were measured using ultrafast UV pump-probe experiments with (AlGa)N membranes. Strong Brillouin oscillations were observed in the (AlGa)N films attached to GaAs substrates. These oscillations are due to the dynamical interference of the probe beams reflected from the sample surface and interfaces and a picosecond-duration strain pulse propagating in the alloy layer. Optical and elasto-optical parameters including the complex refractive index and the fundamental band gap of the cubic nitride alloys are determined and compared with the values obtained by ellipsometry.

Item Type: Article
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Identification Number: https://doi.org/10.1103/PhysRevMaterials.2.034606
Depositing User: Eprints, Support
Date Deposited: 02 Mar 2018 09:56
Last Modified: 27 Apr 2018 08:46
URI: http://eprints.nottingham.ac.uk/id/eprint/50127

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