Broadbandand phonon-polariton dispersion relation of ferroelectric LiTaO3 crystals
Broadbandand phonon-polariton dispersion relation of ferroelectric LiTaO3 crystals
复制标题
铁电LiTaO3晶体的宽带声子极化子色散关系
DOI：
10.1080/00150193.2018.1470825
复制
发表时间：
2018
期刊：
影响因子：
0.8
通讯作者：
S. Kojima and M. Maczka
中科院分区：
文献类型：
--
作者：
Kikuchi Nobuaki;Shimada Kyohei;Shimatsu Takehito;Okamoto Satoshi;Kitakami Osamu;S. Kojima and M. Maczka
钽酸锂是一种众所周知的光学晶体。研究了钽酸锂铁电晶体中声子-极化激元的色散关系。用FT-IR测量了远红外和中红外区的E//x和E//z偏振的反射率谱，它们分别与E（x，y）和A1（z）对称模有关。确定了声子极化激元频率与极化激元波矢的真实的实部和虚部的色散关系。用前向拉曼散射研究了E（x，y）和A1（z）对称极化激元模。通过与通过前向拉曼散射和太赫兹时域光谱确定的观察到的极化激元色散关系相结合，确定了10 cm-1和1200 cm-1之间的宽带极化激元频率色散。
Lithium tantalate is a well-known optical crystal. The dispersion relation of phonon-polaritons was studied in ferroelectric lithium tantalate crystals. The reflectivity spectra of E//x and E//z polarizations, which are related to E(x,y) and A1(z) symmetry modes respectively, were measured by the FT-IR measurement in the far- and mid-IR regions. The dispersion relation of phonon-polariton frequency against real and imaginary parts of polariton wavevector was determined. E(x,y) and A1(z) symmetry polariton modes were also studied by forward Raman scattering. By the combination with the observed polariton dispersion relation determined by forward Raman scattering and terahertz time-domain spectroscopy, the broadband polariton frequency dispersion was determined between 10 cm−1and 1200 cm−1.