Open AccessDielectric behavior of CaCu_3Ti_4O_12 ceramics in the terahertz range
Author(s) -
Liang Wu,
Furi Ling,
Ting Liu,
Jinsong Liu,
Yuheng Xu,
Jianquan Yao
Publication year - 2011
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.19.005118
Subject(s) - materials science , dielectric , terahertz radiation , refractive index , ceramic , optics , polarization (electrochemistry) , optoelectronics , composite material , chemistry , physics
The dielectric properties of 1050 °C/12h sintered CaCu3Ti4O12 (CCTO) ceramics have been investigated by using terahertz time domain spectroscopy in the frequency range of 0.2-1.6 THz at room temperature. When applying an external optical field, an obvious variation of dielectric constant was observed and reached up to 7%. However, the dielectric loss does not change appreciably. From the results, we found the change of refractive index has a linear relationship on scale with the applied light intensity. These findings were attributed to the change of spontaneous polarization in the ceramic caused by the excited free carriers.