AI 中文总结
研究通过结合偏振角分辨拉曼光谱与新拟合程序，对β-Ga₂O₃单晶多晶面测量，考虑双折射实现全光谱分离，定量确定15种拉曼活性模式的能量及相对拉曼张量元素。
AI 中文摘要
Ga₂O₃单斜相的低对称性导致明显的光学各向异性和双折射，这强烈影响拉曼响应。由于拉曼散射对材料极化率敏感，为提取定量信息必须考虑这种各向异性。本文报道了对β-Ga₂O₃单晶三个主晶面(100)、(010)、(001)以及(201)面的拉曼测量。通过结合偏振角分辨拉曼光谱(PARRS)和新开发的拟合程序，并明确考虑双折射，实现了全光谱分离，定量确定了15种拉曼活性模式的能量和相对拉曼张量元素。
英文摘要
The low symmetry of the monoclinic phase of Ga$_2$O$_3$ leads to pronounced optical anisotropy and, consequently, to birefringence, which strongly affects the Raman response. Because Raman scattering is fundamentally sensitive to the polarizability of a material, this anisotropy must be carefully accounted for in order to extract quantitative information - an effort that has only recently been shown to be feasible in such media. Here, we report Raman measurements from all three principal crystal planes $(100)$, $(010)$, and $(001)$, as well as from the $(\overline{2}01)$-plane of a $β$-Ga$_2$O$_3$ single crystal. By combining polarization angle-resolved Raman spectroscopy (PARRS) with a newly developed fitting procedure and explicitly accounting for birefringence, we achieve full spectral separation and quantitatively determine the energies and relative Raman tensor elements of all 15 Raman-active modes.
