Advanced Photonics, 2021, 3 (2): 026003, Published Online: Apr. 6, 2021   

Time-domain terahertz optoacoustics: manipulable water sensing and dampening Download: 840次

Jiao Li 1†Yixin Yao 1,2,3Liwen Jiang 1,2,3Shuai Li 1Zhihao Yi 1,2,3Xieyu Chen 1,2,3Zhen Tian 1,2,3,*Weili Zhang 4,*
Author Affiliations
1 Tianjin University, School of Precision Instruments and Optoelectronics Engineering, Tianjin, China
2 Tianjin University, Center for Terahertz Waves, Tianjin, China
3 Ministry of Education, Key Laboratory of Optoelectronics Information and Technology, Tianjin, China
4 Oklahoma State University, School of Electrical and Computer Engineering, Stillwater, Oklahoma, United States
Abstract
Radiation at terahertz frequencies can be used to analyze the structural dynamics of water and biomolecules, but applying the technique to aqueous solutions and tissues remains challenging since terahertz radiation is strongly absorbed by water. While this absorption enables certain analyses, such as the structure of water and its interactions with biological solutes, it limits the thickness of samples that can be analyzed, and it drowns out weaker signals from biomolecules of interest. We present a method for analyzing water-rich samples via time-domain terahertz optoacoustics over a 104-fold thickness ranging from microns to centimeters. We demonstrate that adjusting the temperature to alter the terahertz optoacoustic (THz-OA) signal of water improves the sensitivity with which it can be analyzed and, conversely, can reduce or even “silence” its signal. Temperature-manipulated THz-OA signals of aqueous solutions allow detection of solutes such as ions with an order of magnitude greater sensitivity than terahertz time-domain spectroscopy, and potentially provide more characteristic parameters related to both terahertz absorption and ultrasonic propagation. Terahertz optoacoustics may be a powerful tool for spectroscopy and potential imaging of aqueous solutions and tissues to explore molecular interactions and biochemical processes.

Jiao Li, Yixin Yao, Liwen Jiang, Shuai Li, Zhihao Yi, Xieyu Chen, Zhen Tian, Weili Zhang. Time-domain terahertz optoacoustics: manipulable water sensing and dampening[J]. Advanced Photonics, 2021, 3(2): 026003.

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