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

Whale, Josh; Akimov, Andrey V.; Novikov, Sergei V.; Mellor, Christopher J.; Kent, Anthony J.

Authors

Josh Whale

Andrey V. Akimov

Sergei V. Novikov

Christopher J. Mellor

Anthony J. Kent



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.

Journal Article Type Article
Publication Date Mar 29, 2018
Journal Physical Review Materials
Electronic ISSN 2475-9953
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 2
Issue 3
APA6 Citation Whale, J., Akimov, A. V., Novikov, S. V., Mellor, C. J., & Kent, A. J. (2018). Photoelastic properties of zinc-blende (AlGa)N in the UV: picosecond ultrasonic studies. Physical Review Materials, 2(3), https://doi.org/10.1103/PhysRevMaterials.2.034606
DOI https://doi.org/10.1103/PhysRevMaterials.2.034606
Publisher URL https://journals.aps.org/prmaterials/abstract/10.1103/PhysRevMaterials.2.034606
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0





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