研究目的
To develop a highly sensitive ellipsometry method for measuring the optical constants of liquids, especially water-containing solutions, in the terahertz range.
研究成果
The proposed method successfully measures the optical constants of liquids in the terahertz range with high sensitivity. It distinguishes between water and aqueous solutions of medical substances, suggesting potential for biomedical diagnostics. Future research could explore multi-angle measurements for enhanced accuracy.
研究不足
The method's accuracy is influenced by hardware errors and the angle of incidence optimization for specific optical constants. Multi-angle measurements could further improve accuracy but are not explored in this study.
1：Experimental Design and Method Selection:
The study employs a highly sensitive ellipsometry method using tunable monochromatic radiation from the Novosibirsk free-electron laser, supplemented with an internal reflection module for highly absorbing samples.
2：Sample Selection and Data Sources:
Various liquids, including distilled water, decan, ethanol, dry blood, and blood serum, were measured.
3：List of Experimental Equipment and Materials:
The setup includes a terahertz ellipsometer, a silicon prism, metal-coated polyethylene grids as polarizers, and a pyroelectric detector MG-
4：Experimental Procedures and Operational Workflow:
The radiation is directed through a prism to the liquid/prism interface, reflected, and analyzed for polarization changes.
5：Data Analysis Methods:
The optical constants are calculated using Fresnel coefficients and ellipsometric parameters.
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