Properties of Terahertz spectral in aluminium oxide crystal
Received:August 21, 2020  Revised:January 12, 2021  download
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Author NameAffiliationE-mail
LI Gao-Fang School of Electronic & Information Engineering Shanghai University of Electric Power Shanghai 200082 China
State Key Laboratory of Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China 
ligaofang@shiep.edu.cn 
XU Yan-Xia School of Electronic & Information Engineering Shanghai University of Electric Power Shanghai 200082 China xuyanxia@mail.shiep.edu.cn 
HU Tao State Key Laboratory of Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China  
NIE Xiao-Bo School of Electronic & Information Engineering Shanghai University of Electric Power Shanghai 200082 China  
BIAN Zheng-Lan School of Electronic & Information Engineering Shanghai University of Electric Power Shanghai 200082 China  
HUANG Zhi-Ming State Key Laboratory of Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China  
CHU Jun-Hao State Key Laboratory of Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China  
Abstract: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.
keywords:aluminium oxide  Terahertz time-domain spectroscopy  birefringence  pulse shaping
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