New application of terahertz time-domain spectrometry (THz-TDS) to the phonon-polariton observation on ferroelectric crystals

被引：12
|
作者：
Nishizawa, S [1 ]
Tsumura, N
Kitahara, H
Takeda, MW
Kojima, S
机构：
[1] Shinshu Univ, Cooperat Res Ctr, Nagano 3808553, Japan
[2] Shinshu Univ, Fac Sci, Dept Phys, Matsumoto, Nagano 3908621, Japan
[3] Univ Tsukuba, Inst Mat Sci, Tsukuba, Ibaraki 3058573, Japan
来源：
PHYSICS IN MEDICINE AND BIOLOGY | 2002年 / 47卷 / 21期
关键词：
D O I：
10.1088/0031-9155/47/21/315
中图分类号：
R318 [生物医学工程];
学科分类号：
0831 ;
摘要：
A new instrument for terahertz time-domain spectroscopy (THz-TDS) has been developed. It consists of a composite THz-TDS system and a high throughput (Martin-Puplett) interferometer. The instrument is for use in the qualitative study of optoelectronic constants of materials. The spectral transmission intensity and phase shift related to phonon-polariton dispersion have been measured between 100 cm(-1) and 3 cm(-1) on ferroelectric crystals of industrial interest. These include bismuth titanate Bi4Ti3O12 (a key material for FeRAM). lithium niobate LiNbO3 (a typical nonlinear crystal for parametric oscillator applications) and lithium heptagermanate Li2Ge7O15 for surface elastic wave filter applications. The complex dielectric constants are well reproduced by the phonon-polariton dispersion relation based on the Kurosawa formula. The instrument details and phonon-polariton dispersion results are described.
引用
收藏
页码：3771 / 3776
页数：6
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