太赫兹辐射
激发
极化(电化学)
单斜晶系
各向异性
椭圆极化
光学
声子
物理
介电常数
极化子
电磁辐射
波传播
凝聚态物理
材料科学
线极化
电介质
光电子学
化学
物理化学
量子力学
分子
激光器
标识
DOI:10.1364/isuptw.2016.it3a.2
摘要
The anisotropic propagation of electromagnetic waves in monoclinic crystals are analyzed in detail. When incident waves travel along the mirror plane normal, the two eigen modes following different dispersion relations are found, which are both elliptically polarized with the same ellipticity and chirality but have spatially orthogonal elliptical axes. The frequency independent features are the unique manifestation of the crystal symmetry. Using polarization sensitive terahertz time domain spectroscopy (THz-TDS) and our developed data processing method, we extract complex values of permittivity tensor elements, as well as the refractive indexes and absorption coefficients of the two eigen modes for a monoclinic crystal BaGa4Se7. The formation and propagation of bulk polariton waves resulted from coherent phonon excitation are also discussed.
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