太赫兹超材料薄膜传感系统用于痕量检测的机理与方法研究

太赫兹（Terahertz, THz）光谱作为一种新型的光谱技术已经广泛应用于物理化学、生物医学、材料科学等领域。为了解决对痕量物质进行探测时难以保证较高的灵敏度的问题，太赫兹薄膜传感技术作为太赫兹光谱测量技术的发展新方向已有较多应用，但该技术的理论基础、测量准确度和可靠性等还没有进行系统研究。本课题拟以塑化剂乙醇溶液为研究对象，采用太赫兹超材料薄膜传感器作为测量仪器，系统研究太赫兹光谱薄膜传感器测量痕量物质的测量机制和分析方法。基于拓扑优化方法设计出高灵敏度的太赫兹超材料薄膜传感器，并研究相应的光谱数据分析算法，最后，结合化学计量学方法建立痕样品的定量分析模型，最终为太赫兹光谱薄膜传感技术在食品检测等领域的实际应用打下基础。

As a new spectral technique, Terahertz (THz) spectroscopy has been widely used in the fields of physical chemistry, bio-medicine, material science and so on. In order to solve the problem of lacking in high sensitivity in detecting trace samples, terahertz thin-film sensing technology has been widely applied as a new development direction of terahertz spectroscopy. However, the measurement mechanism, accuracy and reliability of this method have not been studied systematically. In the research project, plasticizer-ethanol solution is chosen as the research object, and the terahertz metamaterial thin-film sensor is usde as the measuring instrument to systematically study the measuring mechanism and analysis method of trace substances measured by terahertz thin-film sensor. Based on the topological optimization method, a high sensitivity terahertz thin-film sensor is designed, and the corresponding spectral data analysis algorithm is studied. Finally, the quantitative analysis model of trace sample is established by combining chemometrics method, which lays the foundation for the practical application of terahertz thin-film sensor technology in food detection and other fields.