氧化铝晶体的太赫兹光谱特性研究  

Properties of Terahertz spectral in aluminium oxide crystal

作　　者：李高芳 许艳霞[1] 胡涛 聂小博[1] 卞正兰 黄志明 褚君浩[2] LI Gao-Fang;XU Yan-Xia;HU Tao;NIE Xiao-Bo;BIAN Zheng-Lan;HUANG Zhi-Ming;CHU Jun-Hao(School of Electronic&Information Engineering,Shanghai University of Electric Power,Shanghai 200090,China;State Key Laboratory of Infrared Physics,Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai 200083,China)

机构地区：[1]上海电力大学电子与信息工程学院,上海200090 [2]中国科学院上海技术物理研究所红外物理国家重点实验室,上海200083

出　　处：《红外与毫米波学报》2021年第1期38-43,共6页Journal of Infrared and Millimeter Waves

基　　金：国家杰出青年科学基金(61625505);国家自然科学基金(11647023);上海市自然科学基金(17ZR1411500)。

摘　　要：利用太赫兹时域光谱(THz-TDS)技术研究了氧化铝(Al2O3)在宽带太赫兹波范围(0.2~3.0 THz)内的光谱特性。改变晶体光轴与太赫兹脉冲偏振方向间的夹角(方位角),得到了Al2O3晶体在不同方位角下的太赫兹时域谱,计算了Al2O3晶体o光和e光的折射率和吸收系数,并画出了Al2O3晶体在太赫兹波段的折射率椭圆图。结果表明,Al2O3在太赫兹频段具有较大的双折射率和较低的吸收系数,双折射率高达0.36,吸收系数低于5 cm^(-1)。基于Al2O3晶体的双折射特性实现了对THz脉冲的相位和振幅的调制。Al2O3晶体可以作为THz脉冲的“整形器”,为太赫兹波在超宽带、超高速通信系统的应用提供重要参考。The spectral characteristics of aluminium oxide(Al2O3)in broadband terahertz wave range(0.2~3.0 THz)were investigated by using terahertz time-domain spectroscopy(THz-TDS).The terahertz time-domain spectra of Al2O3 crystal at different azimuthal angles is obtained by changing the angle between the crystal optical axis and the polarization direction of THz pulse.The refractive index and absorption coefficient of o-and e-waves are calculated,and the index ellipse of Al2O3 in THz band is drawn.The experimental results indicate that Al2O3 has large birefringence and low absorption coefficient in THz,with a birefringence as high as 0.36 and an absorption coefficient lower than 5 cm^(-1).The phase and amplitude of THz pulse can be modulated based on the birefringence of the crystal.Al2O3 crystal can be used as"shaper"of THz pulse,which provides important reference for the application of terahertz wave in ultra-wideband and ultra-high speed communication systems.

关 键 词：氧化铝 太赫兹时域光谱 双折射 脉冲整形 

分 类 号：O433.1[机械工程—光学工程]