title: Dielectric behavior of CaCu3Ti4O12 ceramics in the terahertz range.
abstract: 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.
authors: Wuhan National Laboratory for Optoelectronics, School of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
authors: Liang
authors: L
authors: Wu
authors: Furi
authors: F
authors: Ling
authors: Ting
authors: T
authors: Liu
authors: Jinsong
authors: J
authors: Liu
authors: Yebin
authors: Y
authors: Xu
authors: Jianquan
authors: J
authors: Yao