The splitting of long-wave optical phonons that arises in biaxially stressed zinc-blende- and diamond-type crystals due to violation of cubic symmetry in such crystals was studied both theoretically and experimentally (using micro-Raman technique). The anglular dispersion of optical phonons near the center of the Brillouin zone was calculated for split modes in biaxially stressed (001)-oriented films. The results obtained were used to analyze the effects due to strain and alloying on optical-phonon frequencies in stressed Ge, InGaAs and InAlAs films grown on GaAs (001) substrates. The developed approach permits a more precise determination of both the composition and the biaxial strain in AIIIBV alloy films based on an analysis of Raman spectra taken from such films.

理论上和实验上（使用微拉曼技术）都研究了由于双轴应力的锌-闪长型和金刚石型晶体违反立方对称性而产生的长波光子分裂。计算了在双轴应力（001）取向薄膜中分裂模的布里渊区中心附近的光子的声子的角度色散。所得结果用于分析应变和合金化对在GaAs（001）衬底上生长的受压Ge，InGaAs和InAlAs薄膜中的光子声子频率的影响。所开发的方法可基于对从AIIIBV合金薄膜获取的拉曼光谱的分析来更精确地确定其成分和双轴应变。