Terahertz time-domain spectroscopy of congruent LiNbO3 and LiTaO3 crystals

被引：29

作者：

Igawa, Hikaru ^{[1
]}

Mori, Tatsuya ^{[1
]}

Kojima, Seiji ^{[1
]}

机构：

[1] Univ Tsukuba, Div Mat Sci, Tsukuba, Ibaraki 3058573, Japan

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS | 2014年 / 53卷 / 05期

关键词：

LITHIUM-NIOBATE CRYSTALS; X-RAY DIFFRACTION; 24 DEGREES C; SINGLE CRYSTAL; TEMPERATURE-DEPENDENCE; DIELECTRIC-PROPERTIES; RAMAN-SCATTERING; PHONONS; THZ; REFLECTIVITY;

D O I：

10.7567/JJAP.53.05FE01

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The complex dielectric constants of congruent LiNbO3 and LiTaO3 single crystals in a THz frequency region have been determined directly by using broadband terahertz time-domain spectroscopy (THz-TDS) with reflection configuration. We have successfully extracted the accurate complex dielectric constants by using corrected phase information derived from the transmission measurement results. The lowest E(TO1) phonon modes of both crystals have been observed clearly. On the other hand, additional bands at approximately 2.5THz below the lowest A(1)(TO1) mode frequency have been observed. These bands have also been reported by Raman and hyper-Raman spectroscopy and attributed to intrinsic defects in congruent crystals. According to the experimental results that these additional bands were observed at almost the same frequency on Raman, hyper-Raman, and THz-TDS, these bands are suggested to be assigned as a first-order scattering process. (C) 2014 The Japan Society of Applied Physics

引用

页数：4

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