Whispering-Gallery-Mode Resonator Technique With Microfluidic Channel for Permittivity Measurement of Liquids

  title={Whispering-Gallery-Mode Resonator Technique With Microfluidic Channel for Permittivity Measurement of Liquids},
  author={Alexey I. Gubin and Alexander A. Barannik and Nickolay T. Cherpak and Irina A. Protsenko and Sergey Pud and Andreas Offenhausser and Svetlana A. Vitusevich},
  journal={IEEE Transactions on Microwave Theory and Techniques},
Studies of biochemical liquids require precise determination of their complex permittivity. We developed a microwave characterization technique on the basis of a high-quality whispering-gallery mode (WGM) sapphire resonator with a microfluidic channel filled with the liquid under test. A novel approach allows obtaining the complex permittivity of biochemical liquids of sub-microliter/nanoliter volumes with high accuracy. The method is based on a special procedure of analysis of the interaction… 

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