太赫兹频率下镁掺杂对氧化锌纳米粉体介电性能的影响(英文)  

Influence of Mg doping on dielectric properties of ZnO nanopowders at terahertz frequencies

作　　者：岳中岳[1] 金钻明[1] 李高芳[1] 马国宏[1] 毛智勇[2] 祝迎春[2] 

机构地区：[1]上海大学物理系,上海200444 [2]中国科学院上海硅酸盐研究所,上海200050

出　　处：《红外与毫米波学报》2014年第5期460-464,共5页Journal of Infrared and Millimeter Waves

基　　金：Supported by National Natural Science Foundation of China(11174195);Research Fund for the Doctoral Program of Higher Education of China(20123108110003)

摘　　要：利用偶极天线LT-GaAs发射的太赫兹时域光谱（THz-TDS）研究单晶氧化锌、未掺杂和Mg掺杂的ZnO纳米粉末（粒子）在室温下的太赫兹光谱特性.在0.2～2 THz频率范围内研究了样品的功率吸收和折射率.结果发现,镁掺杂提高了样品材料的吸收效率,同时降低了氧化锌材料的折射率.相比较氧化锌单晶,未掺杂和Mg掺杂氧化锌纳米颗粒的太赫兹介电性质呈现类似的行为,该结果与横向光学E1（TO）声子模式有关.Transmitted terahertz time-domain spectroscopy （THz-TDS） using dipole-antenna on LT-GaAs was ap- plied to determine the THz spectral characteristics of single-crystal ZnO, pure-and Mg-doped ZnO nanopowders （NPs） at room temperature. The power absorption and refractive index were measured in the frequency range from 0.2 to 2 THz. Mg doping increases the absorption coefficient, while decreases the refractive index of the compound ZnO NPs. The THz dielectric properties of pure-and Mg-doped ZnO NPs exhibit similar behaviors with that of the ZnO single crystal, which are found to be associated with the transverse optical E1 （TO）phonon mode.

关 键 词：太赫兹时域光谱技术 掺杂 复介电常数 氧化锌纳米结构 

分 类 号：O437[机械工程—光学工程]