水合TiO_2的太赫兹特性和介电动力学研究

The Characteristics and Dielectric Dynamics of Hydrated TiO_2 in THz Frequency Range

用太赫兹时域光谱技术研究不同加热时间后水合TiO2在0.2～1THz波段的THz时域谱、频域谱、吸收谱、折射率谱和复介电常数。结果表明水合TiO2在THz波段出现明显吸收峰,随加热时间增加,含水量降低,吸收系数减小;样品折射率变化位置与吸收峰位置相对应。水合TiO2在太赫兹波中的电极化响应与频率不存在明显的关系,介电损耗随频率的升高先降低后趋于稳定,介电响应均随加热时间延长而减弱。

Terahertz time-domain spectroscopy（THz-TDS） was used to measure the information of water,the terahertz time-domain and frequency spectroscopy,absorbance,refractive index and the complex dielectric permittivity in the frequency range of 0.2~1 THz of various hydrated TiO2 samples with heating for different times.The result reveals that the absorbance of hydrated TiO2 reduces with heating time increasing,and the location of the absorption peak is corresponded to the refractive index.The response of electric polarization in THz field has no clear relations with the frequency.With frequency increasing,the dielectric dissipation of hydrated TiO2 firstly decreases and then tends to be stable.The dielectric response always reduces with heating time increasing.