Photoelastic properties of zinc-blende AlxGa1-xN in the UV: Picosecond ultrasonic studies

被引：16

作者：

Whale, J. ^{[1
]}

Akimov, A. V. ^{[1
]}

Novikov, S. V. ^{[1
]}

Mellor, C. J. ^{[1
]}

Kent, A. J. ^{[1
]}

机构：

[1] Univ Nottingham, Sch Phys & Astron, Univ Pk, Nottingham NG7 2RD, England

来源：

PHYSICAL REVIEW MATERIALS | 2018年 / 2卷 / 03期

基金：

英国工程与自然科学研究理事会;

关键词：

OPTICAL-PROPERTIES; GAN; CONSTANTS; PHONONS; ALN;

D O I：

10.1103/PhysRevMaterials.2.034606

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 (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.

引用

页数：8

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