An axially-symmetric sheared polymer network liquid crystal (SPNLC) device is demonstrated and its performances characterized. Through analyzing the structure of this axially-symmetric SPNLC, we constructed a 3-D model to explain the observed phenomena. The simulation results agree well with the experiment. Two potential applications of such an axially-symmetric SPNLC, namely tunable-focus nega...

We propose a novel tunable optical add/drop multiplexer, based on Asymmetric Bragg Coupler and the liquid crystal as the active layer. Such device provides the features of small size, wide tuning range, narrow channel bandwidth, low electric power, high tuning speed, and simple control mechanisms. The transmission bandwidth is about 32.5GHz and the tunable range is about 250GHz.

We infiltrate liquid crystals doped with BaTiO3 nanoparticles in a photonic crystal fiber and compare the measured transmission spectrum with the one achieved without dopant. New interesting features, such as frequency modulation response of the device and a transmission spectrum with tunable attenuation on the short wavelength side of the widest bandgap, suggest a potential application of this...

Liquid crystal flow model is a coupling between orientation (director field) of liquid crystal molecules and a flow field. The model is also related to a phase field model of multiphase flows and to microfluidics device. It is crucial to preserve the energy laws of the hydrodynamical system in numerical simulation of liquid crystal flows, especially when orientation singularities are involved. ...

A model of the liquid crystal director orientation was combined with a non-sequential ray tracing program to compute the reflected intensity from a LCOS device for a rear projection TV system. The performance of the LCOS display was characterised by computing the contrast ratio over a realistic viewing cone.

Inhomogeneous polymer-dispersed liquid crystal devices having gradient droplet distribution were fabricated and their phase retardation characterized. The gradient refractive index profile can be used as switchable prism gratings, and positive and negative lenses with tunable focal lengths. Such a tunable electronic lens is a broadband device and can be used for unpolarized light. © 2002 Americ...

We demonstrate using a diffractive smart window with homogeneous-aligned (HA) liquid crystals (LCs) owing to the large spatial phase difference in all directions opaque state. The proposed grating cell had high haze value (88.57%), which was 1.16 times higher than previously reported vertically aligned (VA) cells because twist angle what VA had. Our HA can be used various applications.

A broadband polarization switch consisting of an active twisted nematic liquid crystal cell and two passive uniaxial compensation films is analysed. The conjugate gradient method was used for optimizing the device parameters. Simulation results indicate that the polarization switch exhibits a broad bandwidth and high contrast ratio. The manufacturing tolerances on cell gap, twist angle and comp...

Liquid crystal displays (LCDs) with highly interactive graphical user interfaces (GUIs) are replacing the traditional “mechanical” human-machine interfaces (HMIs) currently found on most home appliances. This paper explores these technologies, as well as Altera, Altia, and Echelon’s innovative, total-solution architecture for delivering low-cost, high-performance HMIs on virtually any home appl...