Abstract-Testing of Sub-THz Properties of Bioliquids Using WGM Resonator with Microfluidic Channel

I. A. Protsenko, A. A. Barannik, A. I. Gubin, N. T. Cherpak, S. A. Vitusevich

https://link.springer.com/chapter/10.1007/978-94-024-1093-8_8

In the present work, the measurement cell for investigation of small-volume liquids in sub-THz range is proposed. The proposed measurement cell is based on the whispering-gallery mode quartz resonator covered with the plastic layer comprising the microfluidic channel and allows obtaining the complex permittivity of the liquid filling the microfluidic channel. Investigation of the resonator structure was carried out experimentally and using the numerical model of the structure. It is shown that the resonator structure can be used as a measurement cell with additional calibration procedure.

Abstract-Submm-Wave Reflection and Transmission Technique for Testing and Monitoring of Biochemical Solutions

A. I. Gubin, S. A. Vitusevich, 


https://link.springer.com/chapter/10.1007/978-94-024-1093-8_5

The investigation of dielectric permittivity of liquids in a wide frequency range is important not only for liquid identification, but these studies provide very useful information on liquid under test as well. We show that the method of investigation of the complex conductivity of superconducting samples by grazing incidence reflectivity measurements can be also used for investigation of dielectric properties of different biochemical solutions. The optimal incident angle was obtained by calculation of the reflection and transmission coefficients at the liquid-dielectric interfaces for given conditions. It is determined as the maximum of the reflection coefficient sensitivity to the liquid permittivity changes. The measurement cell based on Teflon prism allowing grazing incidence angles on liquid media is designed. The experimental results of the transmission coefficient through the prism filled with water and air demonstrates that the technique can be used for the liquid investigation in a wide frequency range. The other advantage of the method is the possibility of measurement of liquids with different thicknesses and especially samples with unknown thickness. This technique can be also applied for determination of explosives and monitoring of different biochemical solutions.