常用衬底材料的宽谱太赫兹透射特性研究  

Research on wideband terahertz transmission characteristics of commonly used substrate materials

作　　者：李恩恩 王天武 方广有 LI En-en;WANG Tian-wu;FANG Guang-you(Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China;Key Laboratory of Electromagnetic Radiation and Sensing Technology,Chinese Academy of Sciences,Beijing100190,China;School of Electronic,Electrical and Communication Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;GBA branch of Aerospace Information Research Institute,Chinese Academy of Sciences,Guangzhou 510700,China;Guangdong Provincial Key Laboratory of Terahertz Quantum Electromagnetics,Guangzhou 510700,China)

机构地区：[1]中国科学院空天信息创新研究院,北京100094 [2]中国科学院电磁辐射与探测技术重点实验室,北京100190 [3]中国科学院大学电子电气与通信工程学院,北京100049 [4]广东大湾区空天信息研究院,广东广州510700 [5]广东省太赫兹量子电磁学重点实验室,广东广州510700

出　　处：《激光与红外》2024年第9期1455-1461,共7页Laser & Infrared

基　　金：国家自然科学基金项目(No.6198810212274424);科技部重点研发计划项目(No.2022YFA1203500);广东省重点研发计划项目(No.2019B090917007);广东省科技计划项目(No.2019B090909011)资助。

摘　　要：宽谱透射式太赫兹时域光谱技术在材料载流子动力学、指纹谱识别等研究领域中有着重要作用。由于低维材料需要衬底的支撑,在太赫兹波与低维材料相互作用的研究中衬底的透射特性十分重要。为了研究不同衬底材料在太赫兹波段的光学特性,首先测试了三种常见的衬底材料的太赫兹透射信号,然后在有效频谱范围内计算各自的折射率和吸收系数。结果表明,CVD金刚石在1 THz~18 THz频率范围内保持较小色散特性的折射率和吸收系数(小于10 cm^(-1)),因此非常适合用于宽谱太赫兹时域系统,而熔融石英和氧化镁晶体在宽谱太赫兹波段色散较为严重,透射时域信号出现较大展宽,仅适用于低频范围内(小于3 THz)的太赫兹时域光谱系统研究。该结果为基于宽谱太赫兹时域光谱技术的研究提供重要的参考。Broadband transmission terahertz time-domain spectroscopy plays a significant role in research fields such as material carrier dynamics and fingerprint spectrum identification.Due to the support required for low-dimensional materials,the transmission characteristics of substrates are crucial in the study of the interaction between terahertz waves and low-dimensional materials.To investigate the optical properties of different substrate materials in the terahertz range,the terahertz transmission signals of three common substrate materials are tested at first.The refractive index and absorption coefficient of each material are then calculated within the effective spectral range.The results show that CVD diamond maintains small-dispersion refractive index and absorption coefficients(less than 10 cm^(-1))in the frequency range of 1 THz~18 THz,making it suitable for use in broadband terahertz time-domain systems.While,fused quartz and magnesium oxide crystals exhibit significant dispersion in the broadband terahertz range,leading to a broadening of the transmitted time-domain signals,and they are only suitable for terahertz time-domain spectroscopy system studies in the low-frequency range(less than 3THz).Thus,the results provide an important reference for research based on broad-spectrum terahertz time-domain spectroscopy.

关 键 词：太赫兹时域光谱 CVD金刚石 熔融石英 氧化镁晶体 色散 透射特性 

分 类 号：O441[理学—电磁学] TN213[理学—物理]