现代科学仪器2024，Vol.41Issue(5)：22-26,5.
基于光电导天线探测的THz-ATR系统设计和性能研究
Design and performance study of THz-ATR system based on photoconductive antenna detection
郝纪轩 1王静崎 1石薇琳 1赵国忠 1赵昊辰 1安明明 1周鑫莉 1舒敬懿 1崔立棋 1张逸辰 1黄熙文 1韩齐志1
作者信息
- 1. 首都师范大学物理系,北京 100048||太赫兹光电子学教育部重点实验室,北京 100048
- 折叠
摘要
Abstract
In this paper,a terahertz attenuated total reflection(THz-ATR)system based on photoconductive antenna detection was designed and built to prepare for the sensing and detection of trace and low-concentration biochemical macromolecular aqueous solutions.Unlike the THz-TDS test,where the terahertz wave is in direct contact with the sample,the THz-ATR system uses the evanescent wave generated at the interface where total reflection occurs to avoid the strong absorption of terahertz waves by the aqueous solution during the test.The system terahertz light is generated by femtosecond light excited by indium arsenide,which detects a photoconductive antenna using a hemispherical silicon lens to delay echoes in the time-domain spectrum,resulting in high-frequency spectral resolution.The performance of the built THz-ATR system was tested,and its frequency range was 0.2-2 THz,the dynamic range was better than 50 dB,the signal-to-noise ratio was 600:1,and the spectral resolution could reach 3 GHz.Finally,the spectral characteristics of different humidity environments were explored to provide support for subsequent experiments.关键词
太赫兹/衰减全反射(ATR)/高频谱分辨率Key words
terahertz/Attenuated Total Reflection(ATR)/High spectral resolution分类
物理学引用本文复制引用
郝纪轩,王静崎,石薇琳,赵国忠,赵昊辰,安明明,周鑫莉,舒敬懿,崔立棋,张逸辰,黄熙文,韩齐志..基于光电导天线探测的THz-ATR系统设计和性能研究[J].现代科学仪器,2024,41(5):22-26,5.
