钆镓石榴石（GGG）和钆钪镓石榴石（SGGG）的太赫兹响应
Terahertz response of gadolinium gallium garnet (GGG) and gadolinium scandium gallium garnet (SGGG)
摘要：
报道了钆镓石榴石（GGG）和钆钪镓石榴石（SGGG）在$300 \, \mathrm{GHz}$ ~ $1 \, \mathrm{THz}$频率范围内的磁光响应，并确定了材料响应张量。在该频率窗口内，材料表现出非色散和低损耗的光学响应。在低温下，在（S）GGG样品中发现了显著的太赫兹法拉第旋转。这种强的旋电响应可能与Gd $^{3+}$离子的高自旋顺磁状态有关。确定的材料响应张量的模型，连同Verdet和磁光常数。
英文摘要：
We report the magneto-optical response of Gadolinium Gallium Garnet (GGG) and Gadolinium Scandium Gallium Garnet (SGGG) at frequencies ranging from $300 \, \mathrm{GHz}$ to $1 \, \mathrm{THz}$, and determine the material response tensor. Within this frequency window, the materials exhibit nondispersive and low-loss optical responses. At low temperatures, significant THz Faraday rotations are found in the (S)GGG samples. Such strong gyroelectric response is likely associated with the high-spin paramagnetic state of the Gd$^{3+}$ ions. A model of the material response tensor is determined, together with the Verdet and magneto-optic constants.
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