Abstract

In this paper we present the results of the terahertz measurements of liquid crystal (LC) doped with ferroelectric nanoparticles (NPs) suspensions in the range of frequency from 0.3 up to 3.0 THz. For measurements we used a THz time-domain spectrometer (THz-TDS), which is described in detail in [1,2]. As ferroelectric nanoparticles, we choose barium titanate (BaTiO₃). We used nanoparticles prepared by the sol gel process based on tetrabutyl titanate Ti(C₄H₉)₄ and barium acetate Ba(CH₃COO)₂ [3]. For the preparation of the ferroelectric suspensions we used five liquid crystal materials: two single compounds: 6CHBT and 2,3′,5′-trifluoro-4-(4-pentylcyclohexyl)-4′-(trifluoromethoxy)-1,1′-biphenyl (compound A) and three mixtures: 1867, 2037 and 2020. In Fig. 1(a) the birefringence Δn of the liquid crystal material 2020 and its ferroelectric suspensions are presented and Fig. 1(b) shows the birefringence difference between them.

© 2015 IEEE