We have found that nanoparticles of polyhedral oligomeric silsesquioxane (POSS) can induce vertical alignment in nematic liquid crystal (LC) cells as long the doped weight percentage POSS LC is higher than ∼1%. Such nanoparticle-induced (NIVA) a very suitable technique for application low-temperature fabrication plastic displays. The dynamic process orientation from randomly parallel to was recorded, and it posited NIVA due adsorption on inner surfaces cells. influence concentration...

The pretilt angles of liquid crystal molecules can be controlled by using conventional polyimide (PI) alignment material doped with different concentrations Polyhedral Oligomeric Silsequioxanes (POSS) nanoparticles, which have been observed to spontaneously induce vertical alignment. addition POSS in the homogenous PI changes surface energy layer and generates a variable angle. Experimental results demonstrate that angle thetap is function concentration, tuned continuously over range 0...

A broadband cholesteric liquid crystal (CLC) device with a multi-domain structure is demonstrated by using an aggregation of polyhedral oligomeric silsesquioxane (POSS) nanoparticles in the CLC layer. The pattern self-assembled POSS depends on concentration doped mixture POSS/CLC and cooling rate from temperature higher than clear point. POSS-induced changes bulk surface properties cells, such as promotion homeotropic alignment, help to form reflection light; latter can be used for...

This study introduces a novel methodology for the microfluidic colorimetric detection of soil analytes, offering enhanced efficiency assessing plant growth parameters. Microfluidic channels (µPADs) were fabricated on paper substrates...

The nanoparticles-induced vertical alignment technique was applied to generate variable liquid-crystal pretilt angles based on doping different concentrations of polyhedral oligomeric silsesquioxane (POSS) nanoparticles in the planar-aligned liquid crystal cells. Competition between homogeneously aligned polyimide layer and POSS-induced spontaneous domain generated angle. Experimental results demonstrated that angle theta(p) is a function doped POSS concentration can be controlled...

A simple method to make a switchable liquid crystal (LC) Fresnel lens with high diffraction efficiency and low driving voltage was proposed based on the photo-induced surface modification of vertical alignment layer. UV illumination alters pretilt angle layers, zone-distribution hybrid in homeotropic LC cell can be straightforwardly achieved through exposure, yielding concentric structure phase lens. remarkable ~31.4%, close measured used Fresnel-zone-plate mask 32%, detected using linearly...

We demonstrated a simple and cost-effective method to fabricate all fiber Mach-Zehnder interferometer (MZI) based on cascading short section of liquid crystal (LC)-filled hollow-optic (HOF) between two single mode fibers by using automatically splicing technique.The transmission spectra the proposed MZI with different LC-infiltrated length were measured temperature-induced wavelength shifts interference fringes recorded.Both blue shift red observed, depending temperature range.Based our...

We demonstrate a high sensitivity all-fiber Mach–Zehnder interferometer (MZI) based on radial-aligned liquid crystal (LC) in hollow optical fiber (HOF). The transmission spectrum of the crystal-filled MZI (LCF-MZI) was measured at different temperatures, and thermal-induced wavelength shift interference probed. experimental results indicate that LC alignment refractive indices inside capillary are significantly influenced by temperature, which turn changes properties LCF-MZI. Our data notch...

We demonstrated a relatively simple and effective method to fabricate periodically isolated polymer wall of blue-phase liquid crystal Fresnel lens (BPLCFL) by employing single-masking process the ultraviolet (UV) irradiation, leading excellent photopolymerisation-induced phase separation between blue -phase (BPLC) molecules UV-curable monomers. Nevertheless, some uncured monomers would inherently reside in BPLC-rich area slightly inhibit BPLC realigned under external electric field. To...

A responsive hydrogen-bonded cholesteric liquid crystal polymer (CLCP) film with controlled porosity was fabricated as an optical sensor to distinguish between methanol and ethanol in alcohol solutions. To facilitate responding the alcohols, generated by removing nonreactive agent, hydrogen bridges of CLCP were broken. The sensitivities CLCPs obtained monitoring wavelength shifts transmission spectrum at different concentrations ratios methanol/ethanol. Changes central network allowed...

A new, to the best of our knowledge, in-fiber Mach-Zehnder interferometric sensor is proposed and experimentally demonstrated for detecting Cu2+ ions in an aqueous environment. The fabricated simply cost-effectively by arc-fusing a short section hollow optical fiber between two standard single-mode fibers functionalized depositing chitosan poly(acrylic acid) bilayers using electrostatic self-assembly. shows linear response with sensitivity 42 nm/mM ion concentration from 0 40 µM. Moreover,...

All-fiber curvature sensors based on a liquid crystal-filled fiber Mach–Zehnder interferometer (LCF-MZI) are proposed and experimentally demonstrated for high performance measurements of very small curvatures from 0 to 0.0667 m−1, which is usually hard be precisely monitored by well-known methods. Such sensor can easily fabricated splicing section an LC-filled hollow core between two single mode fibers. Our experimental results show that the maximum sensitivity −724.3 nm/m−1 wavelength shift...

A simple, low-cost, and quickly reversible sensor based on polymer cholesteric liquid crystal film (PCLCF) for detecting organic vapour is proposed in this work. PCLCF exhibits an obvious red shift of the reflective colour early stages acetone diffusion has ability to recover as released. The transmittance spectrum attributed pitch swelling PCLCs. acetone-induced change response time PCLCs, which have been quantitatively characterised, increase with amount adsorbed vapour. This work also...

This study explores the impact of electrode polarization on SnSe nanosheets blended with liquid crystal cells and investigates how impurity ions influence performance crystal.

A controllable multi-wavelength laser from a dye-doped cholesteric liquid crystal (DDCLC) cell is demonstrated by incorporating self-assembled polyhedral oligomeric silsesquioxane (POSS) nanoparticles (NPs). Multi-wavelength lasing emission achieved formation of multiple planar domains; this dominantly influenced the vertical alignment NP clusters adsorbed on substrate surface through rapid thermal annealing process. The peaks are generated resultant effect longitudinal resonant modes...

We propose a novel, simple, cost-effective sensor based on orientational transitions of nematic liquid crystals (LC) for real-time, quantitative, and sensitive detection creatinine. A micro-well array structure polydimethylsiloxane (PDMS) substrate was fabricated to replace traditional copper grids stabilising thin LC film, which contains 4-cyano-4ʹ-pentylbiphenyl (5CB) material 4ʹ-hexylbiphenyl-4-carboxylic acid (HBA). The principle the is ordering transition LCs induced by enzymatic...

A simple and low-cost technique is proposed to construct a tunable liquid crystal (LC) microlens with crater polymer structure, which prepared using micro-drop technology 2-step UV polymerization. The dimensions the geometric profile of restructured surface significantly depend on volume micro droplet, irradiation dose. In this work, focal length LC controlled electrically from infinity 7.8 cm. Such has prospective applications in optical communications, image processing, switchable 2D/3D displays.