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中文摘要：
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.
英文摘要：
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.
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