氧化镁单晶在太赫兹波段的介电特性
发布时间：2018-07-14 22:05
【摘要】：利用太赫兹时域光谱系统,在0.5~9.5 THz范围内对氧化镁单晶基片的介电特性进行了研究,并获得折射率、吸收系数以及复介电函数信息。实验数据表明,在低频(2 THz)范围内,氧化镁单晶透过性较好,折射率在3.12~3.15之间。折射率和吸收系数均随频率增加而增大,且在3.16 THz和8.11 THz两处存在明显的吸收峰。通过经典的赝简谐振动理论很好地拟合了实验结果,分析了晶体中的横向光学声子振动模式,为氧化镁单晶在宽带太赫兹波段的应用提供了有益参考。
[Abstract]:The dielectric properties of magnesium oxide single crystal substrate were studied in the range of 0.5 ~ 9.5 THz by terahertz time-domain spectroscopy system, and the information of refractive index, absorption coefficient and complex dielectric function were obtained. The experimental data show that in the range of low frequency (2 THz), the transmission of magnesium oxide single crystal is better, and the refractive index is between 3.12 and 3.15. The refractive index and absorption coefficient increase with the increase of frequency, and there are obvious absorption peaks at 3.16 THz and 8.11 THz. The experimental results are well fitted by the classical pseudo-harmonic vibration theory, and the transverse optical phonon vibration modes in the crystal are analyzed, which provides a useful reference for the application of magnesium oxide single crystal in the wideband terahertz band.
【作者单位】： 天津大学精密仪器与光电子工程学院光电信息技术科学教育部重点实验室太赫兹波研究中心;中国科学院上海应用物理研究所;
【基金】：国家重点基础研究发展计划(2014CB339800) 国家自然科学基金(61427814,61138001,61422509)
【分类号】：TQ132.2
本文编号：2123102
[Abstract]:The dielectric properties of magnesium oxide single crystal substrate were studied in the range of 0.5 ~ 9.5 THz by terahertz time-domain spectroscopy system, and the information of refractive index, absorption coefficient and complex dielectric function were obtained. The experimental data show that in the range of low frequency (2 THz), the transmission of magnesium oxide single crystal is better, and the refractive index is between 3.12 and 3.15. The refractive index and absorption coefficient increase with the increase of frequency, and there are obvious absorption peaks at 3.16 THz and 8.11 THz. The experimental results are well fitted by the classical pseudo-harmonic vibration theory, and the transverse optical phonon vibration modes in the crystal are analyzed, which provides a useful reference for the application of magnesium oxide single crystal in the wideband terahertz band.
【作者单位】： 天津大学精密仪器与光电子工程学院光电信息技术科学教育部重点实验室太赫兹波研究中心;中国科学院上海应用物理研究所;
【基金】：国家重点基础研究发展计划(2014CB339800) 国家自然科学基金(61427814,61138001,61422509)
【分类号】：TQ132.2
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，本文编号：2123102
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