Jiang Liwen, Zhang Ke, Yao Yixin, Li Shuai, Li Jiao, Tian Zhen, Zhang Weili
School of Precision Instruments and Optoelectronics Engineering, Tianjin University, No.92 Weijin Road, Nankai District, Tianjin 300072, China.
Center for Terahertz Waves, Tianjin University, No.92 Weijin Road, Nankai District, Tianjin 300072, China.
iScience. 2022 Jun 26;25(7):104668. doi: 10.1016/j.isci.2022.104668. eCollection 2022 Jul 15.
Terahertz radiation has been used to detect aqueous salt solutions; however, strong absorption of water in terahertz regime limits the application of traditional terahertz techniques. Here, we present a novel method in analyzing aqueous salt solutions via terahertz optoacoustics. Terahertz optoacoustic signals can be manipulated by temperature control, which allows the dampening of water background and providing more information of solute. We demonstrate that dynamic and continuous terahertz optoacoustic detections of salt solutions with different solutes, concentrations, temperatures, and terahertz spectral frequencies shows the significant potential of this method in distinguishing different salt solutions and quantitatively analyzing salt concentrations. Terahertz optoacoustics may be a powerful tool for quantitative and label-free detection of aqueous salt solutions to further study the complicated aqueous solutions in terahertz regime.
太赫兹辐射已被用于检测盐水溶液；然而，太赫兹波段水的强吸收限制了传统太赫兹技术的应用。在此，我们提出一种通过太赫兹光声分析盐水溶液的新方法。太赫兹光声信号可通过温度控制来操纵，这使得水背景得以减弱，并提供更多溶质信息。我们证明，对不同溶质、浓度、温度和太赫兹光谱频率的盐溶液进行动态和连续的太赫兹光声检测，表明该方法在区分不同盐溶液和定量分析盐浓度方面具有巨大潜力。太赫兹光声可能是一种用于定量和无标记检测盐水溶液的强大工具，以进一步研究太赫兹波段的复杂水溶液。
