A5042375400- Liquid Crystal Research Advancements
- Photonic Crystals and Applications
- Ergonomics and Musculoskeletal Disorders
- Advanced Optical Imaging Technologies
- Electrowetting and Microfluidic Technologies
- Photonic and Optical Devices
- Color perception and design
- Interactive and Immersive Displays
- Tactile and Sensory Interactions
- Synthesis and properties of polymers
- Surfactants and Colloidal Systems
- Advanced optical system design
- Silicone and Siloxane Chemistry
- Optical Coatings and Gratings
- Atomic and Subatomic Physics Research
- Aluminum Alloy Microstructure Properties
- Neutrino Physics Research
- Advanced Materials and Mechanics
- Quantum, superfluid, helium dynamics
- Plasmonic and Surface Plasmon Research
- Semiconductor Lasers and Optical Devices
- Orbital Angular Momentum in Optics
- Surface Roughness and Optical Measurements
- Optical Polarization and Ellipsometry
- Advanced Measurement and Metrology Techniques
National Yang Ming Chiao Tung University
2015-2024
Photonics (United States)
2002-2019
Tainan University of Technology
2016
Ta Hwa University of Science and Technology
2012
Industrial Technology Research Institute
2004-2009
National Kaohsiung University of Applied Sciences
2008-2009
University of Neuchâtel
2007-2008
Colorado State University
2005-2008
IBM (United States)
2007
ITRI International
2005-2007
This letter reports that adding nanoparticles in the negative dielectric anisotropic liquid crystal (LC) cell can exhibit properties of vertical alignment without using layers. The electro-optical this nanoparticles-induced LC are very similar to conventional homeotropic with technique be used fabricate a flexible display requiring low temperature process.
This work proposes a refractive index sensing concept of Tamm plasmon (TP) device by using spectroscopic ellipsometry and phase detection. A TP is generally composed 1-D photonic crystal (PC) with metallic film on top it. We found that the performance can be improved adjusting parameters incident angle polarized light, layer thickness, central wavelength PC. By designing proper parameters, it was change difference p-polarized s-polarized lights, δ∆, reach 34° when ambient environment changed...
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 spontaneous vertical alignment of the mixtures consisting nematic liquid crystals (LCs) and nanoparticles its application to hybrid-aligned (HAN) modes were investigated. LC directors aligned perpendicular nontreated indium-tin-oxide surface by adding nanoparticles. Therefore, we fabricated a nanoparticle-filled HAN cell without using layer. electro-optical properties cells are very similar those conventional containing layers. method nanoparticle-induced is suitable for fabricating...
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...
The control of the liquid crystal (LC) alignment is very important for both academic research and practical applications. LC molecules aligned on ZnO nanoparticle arrays (ZnO NPAs) are demonstrated pretilt angles LCs can be controlled by using NPAs with different surface wettability. wettability fabricated solution-based hydrothermal method changing annealing temperature as-prepared NPAs. measurements energy-dispersive spectra photoluminescence have shown that chemical properties been...
For the surface electronic states of a metal, Tamm plasmonic (TP) mode can be excited without an additional phase-matching component, but in typical device TP resonance wavelength is fixed, which quite limiting. This work develops approach to tuning by incorporating thin layer liquid crystal (LC) into design. Here phase retardation LC ensemble effect, due entire layer, not just molecules at metal's surface, as devices based on surface-plasmon polaritons (SPPs). Also unlike SPP systems,...
A polarizer-free flexible and reflective electro-optical switch using dye-doped liquid crystal (LC) gels is demonstrated. The performances of both scattering absorption based LC depend on curing temperatures due to domain sizes polymer networks. Such bendable trim-able because the vertical networks gel-like materials. gel shows good reflectance ~55%, contrast ratio~450:1 fast response~6.4 ms at temperature 10 degrees C. bending curvature 21 mm. open a new window for electronic papers,...
The technique, nanoparticles-induced vertical alignment (NIVA), was applied to fabricate a guest-host liquid crystal display (GH-LCD) without conventional layers. GH-LCD produced by NIVA exhibited high reflectance of approximately 59% in the voltage-off state and low threshold voltage 2.1 V(rms). is very suitable be for fabricating plastic LCD requiring temperature process, flexible timepiece using demonstrated.
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...
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...
The zinc oxide (ZnO) nanowire arrays on the indium tin (ITO) glass substrates were fabricated by using two-step hydrothermal method. A high transmittance ~92% of ZnO ITO substrate in visible region was obtained. It observed that liquid crystal (LC) directors aligned vertically to arrays. properties as vertical alignment layers and their applications for hybrid-aligned nematic LC modes investigated this work.
The Tamm-plasmon-polariton (TPP) occurs at the interface between a metallic film and photonic-crystal (PC) substrate. Unlike conventional surface-plasmon-polariton (SPP), TPP can be directly excited by both transverse electric (TE) magnetic (TM) electromagnetic waves without using additional coupling optics. fact that optical functionality of most plasmonics devices is determined after fabrication limits their applications. Tunable SPP applying liquid crystals (LCs) have been widely...
Liquid crystal doped with aerosil nanoparticles is known for exhibiting an electromechanical memory effect. After exposing the composite to electric field state induced by stays remembered due presence of nanoparticles. In this paper, we investigated effect and magnetic fields. 4-cyano-4′-pentylbiphenyl non-magnetic a mixture elongated goethite were explored via capacitance measurements. Studied systems exhibited hysteresis in capacitance-voltage capacitance-magnetic dependences. The...