Jiang Liwen, Zhang Ke, Yao Yixin, Liang Jiaxuan, Li Jiao, Tian Zhen
Opt Lett. 2024 Feb 1;49(3):490-493. doi: 10.1364/OL.510058.
Terahertz optoacoustics (THz-OA) combines the advantages of abundant molecular characteristic absorptions in a terahertz band and the low attenuation through ultrasonic detection. Frequency-domain THz-OA, benefiting from the compact and the low cost of a continuous-wave THz source, has been used in gas detection and sensing. However, liquid and solid detections are hard to achieve due to the sensitivity limitation of existing technologies. Here we present a high-sensitivity frequency-domain THz-OA system with customized optoacoustic cells to accomplish non-contact quantitative detection of gas, liquid, and solid samples. The relationships between signal amplitudes and sample concentration, volume and temperature are discussed separately, revealing a potential application of this technology.
太赫兹光声（THz - OA）结合了太赫兹波段丰富的分子特征吸收优势以及超声检测时的低衰减特性。频域太赫兹光声技术受益于连续波太赫兹源的紧凑性和低成本，已被用于气体检测与传感。然而，由于现有技术的灵敏度限制，液体和固体检测难以实现。在此，我们展示了一种具有定制光声池的高灵敏度频域太赫兹光声系统，以实现对气体、液体和固体样品的非接触定量检测。分别讨论了信号幅度与样品浓度、体积和温度之间的关系，揭示了该技术的潜在应用。
