Molecular-theory of high frequency dielectric susceptibility of nematic and cholesteric nano-composites

Mikhail A. Osipov, Alexey S. Merekalov, Alexander A. Ezhov

Research output: Contribution to journalArticle

Abstract

A molecular-statistical theory of the high frequency dielectric susceptibility of the nematic nanocomposites has been developed and approximate analytical expressions for the susceptibility have been obtained in terms of the effective polarizability of a nanoparticle in the nematic host, volume fraction of the nanoparticles and the susceptibility of the pure nematic phase. A simple expression for the split of the plasmon resonance of the nanoparticles in the nematic host has been obtained and it has been shown that in the resonance frequency range the high frequency dielectric anisotropy of the nanocomposite may be significantly larger than that of the pure nematic host. As a result all dielectric and optical properties of the nanocomposite related to the anisotropy are significantly enhanced which may be important for emerging applications. The components of the dielectric susceptibility have been calculated numerically for particular nematic nanocomposites with gold and silver nanoparicles as functions of the nanoparticle volume fraction and frequency. The splitting of the plasmon resonance has been observed together with the significant dependence on the nanoparticle volume fraction and the parameters of the nematic host phase.
Original languageEnglish
Number of pages12
JournalCrystals
Early online date26 Oct 2020
Publication statusE-pub ahead of print - 26 Oct 2020

Keywords

  • liquid crystals
  • molecular-statistical theory
  • nanocomposite

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