ИСТИНА

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, molar fraction of the nanoparticles and the susceptibility of the pure nematic phase, using the general theory developed ealier [1]. 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 nanocomposites based on the nematic liquid crystal 5CB 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. The results for two different nematic hosts have also been compared. Fig.1 The dependence of Re εΙΙ (a), Im εΙΙ (b), Re ε￿ (c) and Im ε￿ (d) of the nematic nanocomposite (host 5CB plus gold nanoparticles) on the volume fraction of nanoparticles φ and frequency ω. Acknowledgments. The authors are grateful to Russian Science Foundation, Grant 20-13-00341 for financial support. [1]. Osipov, M. A. Gorkunov, M. V, Phys. Rev. E., 92, 032501 (2015).