高分辨太赫兹衰减全反射频域光谱系统  

High resolution Attenuated Total Reflection terahertz frequency-domain spectroscopy

作　　者：方兴[1] 张鹿 张红旗 杨作民 吕治东 余显斌[1] FANG Xing;ZHANG Lu;ZHANG Hongqi;YANG Zuomin;LYU Zhidong;YU Xianbin(College of Information Science and Electronic Engineering,Zhejiang University,Hangzhou Zhejiang 310000,China)

机构地区：[1]浙江大学信息与电子工程学院,浙江杭州310000

出　　处：《太赫兹科学与电子信息学报》2024年第8期823-827,841,共6页Journal of Terahertz Science and Electronic Information Technology

基　　金：国家重点研发计划资助项目(2022YFB2903800);浙江省“尖兵”“领雁”研发攻关计划资助项目(2023C01139);国家自然科学基金资助项目(62101483);浙江省自然科学基金资助项目(LQ21F010015)。

摘　　要：由于水对太赫兹(THz)波具有强烈的吸收,含水样本的太赫兹光谱检测面临重大挑战。为解决太赫兹光谱对含水样本的高灵敏检测问题,本文提出并实验验证了一种太赫兹衰减全反射(ATR)的高分辨频域光谱系统。该系统采用创新式光混频相干检测技术,获得了出色的动态范围和分辨力性能,在0.3~1.2 THz范围内,峰值动态范围超过100 dB,频率分辨力高达100 MHz。创新式的ATR架构有效提升了灵敏度,在对不同浓度α-乳糖水溶液的实验测量中,实现了对水溶液样本的直接、精确定量检测。Due to the strong absorption of terahertz(THz)by water,the detection of terahertz spectroscopy for aqueous samples faces significant challenges.To address the issue of high-sensitivity detection of aqueous samples using terahertz spectroscopy,this paper proposes and experimentally verifies a high-resolution frequency-domain spectroscopy system based on terahertz Attenuated Total Reflection(ATR).The system employs an innovative optical heterodyne coherent detection technique,achieving excellent dynamic range and resolution performance.Within the range of 0.3 to 1.2 THz,the peak dynamic range exceeds 100 dB,and the frequency resolution reaches up to 100 MHz.The innovative ATR architecture effectively enhances sensitivity,and in experimental measurements of aqueous solutions with different concentrations ofα-lactose,the system has realized direct and accurate quantitative detection of the aqueous samples.

关 键 词：高分辨太赫兹频域光谱 相干检测 衰减全反射 α-乳糖 

分 类 号：O433.1[机械工程—光学工程]