Abstract
A superior electro-optic (E-O) response has been achieved when multiferroic bismuth ferrite (BiFeO3/BFO) nanoparticles (NPs) were doped in nematic liquid crystal (NLC) host E7 and the LC device was addressed in the large signal regime by an amplitude modulated square wave signal at the frequency of 100 Hz. The optimized concentration of BFO is 0.15 wt%, and the corresponding total optical response time (rise time + decay time) for a 5 μm-thick cell is 2.5 ms for ~7 Vrms. This might be exploited for the construction of adaptive lenses, modulators, displays, and other E-O devices. The possible reason behind the fast response time could be the visco-elastic constant and restoring force imparted by the locally ordered LCs induced by the multiferroic nanoparticles (MNPs). Polarized optical microscopic textural observation shows that the macroscopic dislocation-free excellent contrast have significant impact on improving the image quality and performance of the devices.
Highlights
That nanoparticle liquid-crystal mediated long range interactions could be controlled by changing the anchoring energy and the particle diameter[38]
In liquid crystals (LCs) switching, ferroelectric nanoparticle (FNP) have made a significant impact on E-O performance and demonstrated reduction of Freédericksz threshold voltage, decrease in the switching time (τ on), and increase in the restoring switching time (τ off)[44]
Ferroelectric thio-hypo-diphosphate (Sn2P2S6) doped in NLC host was studied by Ouskova et al.[45] and observed a strong influence of the dielectric absorption spectrum of the molecular rotation around the short axis
Summary
That nanoparticle liquid-crystal mediated long range interactions could be controlled by changing the anchoring energy and the particle diameter[38]. Ferroelectric LC doped with silica NPs which do not have either ferrroelectricity or ferrromagneticity has been studied[42]. Ferroelectric nanoparticle (FNP)-NLC mixers demonstrated strong electro-optic response in low refractive index material[43]. Ferroelectric thio-hypo-diphosphate (Sn2P2S6) doped in NLC host was studied by Ouskova et al.[45] and observed a strong influence of the dielectric absorption spectrum of the molecular rotation around the short axis. BiFeO3 is a unique material that simultaneously exhibits ferroelectric (Curie temperature (TC) = 8 30 °C) and long-range antiferromagnetic G-type (Neel temperature (TN) = 370 °C) ordering[46,47] which have superior electric and magnetic properties[48]. In this work we have synthesized the BFO nanoparticles and studied the E-O properties of BFO NP–NLC (E7) mixtures and demonstrated excellent results. We have achieved some promising response time which could be exploited in adaptive optical devices, display devices and other photonic devices where faster E-O performance is needed
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