Browsing by Author "Rudakova, Natalya V."

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Electro-optical and dielectric properties of polymer-stabilized blue phase liquid crystal impregnated with a fluorine-containing compound
(2018-10-01)
Wu, Po-Chang
;
Chen, Hsin-Li
;
Rudakova, Natalya V.
;
Timofeev, Ivan V.
;
Zyryanov, Victor Ya.
The effects of a fluorine-containing compound (4,4'-difluorobenzophenone; DF) on the electro-optical and dielectric properties of polymer-stabilized blue phase (PSBP) liquid crystals were investigated. When a PSBP cell was driven by an in-plane electric field, the addition of DF up to 2.7 wt% effectively reduced the operation voltage by-30%. Further inspection by dielectric spectroscopy indicated that the ionic concentration in PSBP decreased with increasing loading of OF. This finding can be ascribed to the complexation of impurity ions near the ketone group and carbon-fluorine bonds of the DF compound that restrained the ion transport after photopolymerization. As a result, the DF compound can be regarded as a superior ion-suppressor, enabling the reduction in the ionic effect and, in turn, the promotion of the electro-optical response of a PSBP. (C) 2017 The Authors. Published by Elsevier Inc.
Optical Tamm states at the interface between a photonic crystal and an epsilon-near-zero nanocomposite
(2017-08-01)
Vetrov, Stepan Ya
;
Bikbaev, Rashid G.
;
Rudakova, Natalya V.
;
Chen, Kuo-Ping
;
Timofeev, Ivan V.
The spectral properties of a one-dimensional photonic crystal bounded with a resonance-absorbing nanocomposite layer are investigated. The bulk concentrations of metal nanoparticles dispersed in a transparent nanocomposite matrix are determined at which the effective permittivity takes near-zero values. The transmission, reflection and absorption spectra of the investigated structures at the normal incidence of light are calculated. The demonstrated possibility of formation of the optical Tamm states at the interface between the photonic crystal and nanocomposite is ensured by the near-zero real and imaginary parts of the permittivity or only the imaginary part of the permittivity at the zero real part. The specific features of field localization at the optical Tamm state frequencies are examined.