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@INPROCEEDINGS{Chekubasheva:1034288,
      author       = {Chekubasheva, Valeriia and Zhulai, Dmytro and Gubin and
                      Cherpak and Kula and Vitusevich, Svetlana},
      title        = {{A} {F}requency {T}unable {W}hispering {G}allery {M}ode
                      {R}esonator for {S}tudy of {B}iological {L}iquids.},
      reportid     = {FZJ-2024-07077},
      pages        = {35},
      year         = {2024},
      abstract     = {In recent years, nanotechnology and highly sensitive
                      materials has been increasingly used to develop the devices
                      allowing the study of various diseases. One of promising
                      methods for measuring the concentrations of non-labeled
                      biological substances is the whispering gallery mode (WGM)
                      resonator technique [1] due to high sensitivity and
                      non-contact detection. However, an additional advantage of
                      this technique would be the possibility resonance frequency
                      adjustment, which has not been reported in the
                      literature.This work explores the application of 5CB and
                      1929 liquid crystals (LCs) for frequency tuning of WGM
                      resonators targeted for accurate and sensitive analysis of
                      bioliquids. The dielectric parameters of 5CB and 1929 LCs
                      were measured in a wide frequency range, up to 40 GHz
                      frequency. Dielectric constant and loss tangent are
                      determined using special nomogram calibration procedure,
                      plotted based on data obtained the simulation in COMSOL
                      Multiphysics software and experiment. These data are
                      important for understanding dielectric relaxation processes
                      and times. The simulation process included introducing an
                      additional absorbing dielectric layer filled with LCs and
                      observing the changes in resonant frequencies. Since LCs
                      have low dielectric losses, there is no significant effect
                      on the Q-factor. However, LCs allow the resonant frequency
                      to be effectively shifted to higher frequencies: Δf1
                      =85.8343 MHz for 5CB and Δf2 = 92.5473 MHz for 1929 LCs
                      located parallel to the plane of the resonator.D.Z. greatly
                      appreciates a research grant from the German National
                      Academy of Sciences Leopoldina. V.C. is very grateful for
                      the DAAD grant.(1)1. Gubin A.I., Barannik A.A., Protsenko
                      I.A., Chekubasheva V.A., Lavrinovich A.A., Cherpak N.T.,
                      Vitusevich S. Microwave characterization of aqueous amino
                      acid solutions using the multifrequency WGM resonator
                      technique // Biological Chemistry.-2023.-404, N 2-3.-P.
                      229-235.},
      month         = {Aug},
      date          = {2024-08-21},
      organization  = {12th International Conference
                       "Nanotechnologies and Nanomaterials,
                       Uzhgorod (Ukraine), 21 Aug 2024 - 24
                       Aug 2024},
      cin          = {IBI-3},
      cid          = {I:(DE-Juel1)IBI-3-20200312},
      pnm          = {5241 - Molecular Information Processing in Cellular Systems
                      (POF4-524)},
      pid          = {G:(DE-HGF)POF4-5241},
      typ          = {PUB:(DE-HGF)8},
      doi          = {10.34734/FZJ-2024-07077},
      url          = {https://juser.fz-juelich.de/record/1034288},
}