红外与毫米波学报, 2014, 33 (5): 460, 网络出版: 2014-11-06  

太赫兹频率下镁掺杂对氧化锌纳米粉体介电性能的影响

Influence of Mg doping on dielectric properties of ZnO nanopowders at terahertz frequencies
作者单位
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
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。
Abstract
Transmitted terahertz time-domain spectroscopy (THz-TDS) using dipole-antenna on LT-GaAs was applied 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.
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岳中岳, 金钻明, 李高芳, 马国宏, 毛智勇, 祝迎春. 太赫兹频率下镁掺杂对氧化锌纳米粉体介电性能的影响[J]. 红外与毫米波学报, 2014, 33(5): 460. YUE Zhong-Yue, JIN Zuan-Ming, LI Gao-Fang, MA Guo-Hong, MAO Zhi-Yong, ZHU Ying-Chun. Influence of Mg doping on dielectric properties of ZnO nanopowders at terahertz frequencies[J]. Journal of Infrared and Millimeter Waves, 2014, 33(5): 460.

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