Abstract:
A display device is disclosed. The display device includes a display and a diffractive optical element (DOE). The display is used to show an image. When a user looks at the image within a first viewing angle range, he can see a first observed image, and when he looks at the image within a second viewing angle range, he can see a second observed image. The diffractive optical element is disposed in the lighting direction of the display to diffract the light constructing the first observed image to the second viewing angle range, thereby converting the first observed image into a third observed image and converting the second observed image into a fourth observed image at the same time.
Abstract:
The present invention is directed to a structure, having first areas consisting of or comprising a network of organic polymer material and second areas consisting of a nematic and/or smectic liquid crystal material, comprising at least one or more nematic and/or smectic liquid crystals and a photoluminescent material, wherein the first and second areas alternate in at least a first plane, while the composition of the film is substantially invariable in at least one direction which is angular to the said first plane, or second areas are completely surrounded by first areas, and the said areas are located in a periodic pattern, wherein the nematic and/or smectic liquid crystal material in the second areas extends in the longitudinal direction of the said areas from one end of the area to the other, the structure being arranged between two substrates, at least one of which is light transmitting. The structure together with the substrates may be a Bragg grating and can be used as a DFB laser. It can be prepared by providing a homogeneous and isotropic mixture including a photocurable monomer/oligomer, a nematic and/or smectic liquid crystal, and a photoluminescent material, filling said mixture into the space between two substrates and irradiating same with a light field such that areas of the mixture are irradiated while others are not. Under the irradiation, the mixture separates into areas comprising photocured polymer and areas consisting or comprising liquid crystals and photoluminescent material.
Abstract:
A switchable optical component (10) includes a substrate (18) forming a cavity (14). The substrate (18) is configured with a structured surface (24, 26) adjacent to the cavity, and the substrate has a first index of refraction. A fluid (16) contacts the structured surface. Particles (12) are selectively dispersible in the fluid such that a first concentration of particles in the fluid enables the structured surface to provide an optical effect, and a second concentration of particles in the fluid disables the optical effect.
Abstract:
The present invention discloses a widely wavelength tunable polychrome colloidal photonic crystal device whose optical Bragg diffraction stop bands and higher energy bands wavelength, width and intensity can be tuned in a continuous and fine, rapid and reversible, reproducible and predictable fashion and over a broad spectral range by a controlled expansion or contraction of the colloidal photonic lattice dimension, effected by a predetermined change in the electronic configuration of the composite material. In its preferred embodiment, the material is a composite in the form of a film or a patterned film or shape of any dimension or array of shapes of any dimension comprised of an organized array of microspheres in a matrix of a cross-linked metallopolymer network with a continuously variable redox state of charge and fluid content. The chemo-mechanical and electro-mechanical optical response of the colloidal photonic crystal-metallopolymer gel is exceptionally fast and reversible, attaining its fully swollen state from the dry shrunken state and vice versa on a sub-second time-scale. These composite materials can be inverted by removal of the constituent microspheres from the aforementioned colloidal photonic crystal metallopolymer-gel network to create a macroporous metallopolymer-gel network inverse colloidal photonic crystal film or patterned film or shape of any dimension optical Bragg diffraction stop bands and higher energy bands wavelength, width and intensity can be redox tuned in a continuous and fine, rapid and reversible, reproducible and predictable fashion and over a broad spectral range by a controlled expansion or contraction of the colloidal photonic lattice dimensions.
Abstract:
The present invention relates to methods for increasing the surface conductivity of a polymer used in tuneable diffraction grating (TDG) modulators while at the same time maintaining the total internal reflection (TIR) and transparency.
Abstract:
A liquid crystal cell (100) is presented that utilizes a deposited metal gasket moisture barrier and support membrane (106) bonding two opposing plates of glass (110), a thin film spacer layer (107) to accurately control cell gap thickness, and an optional integrated thermal sensor and heater deposition layer (108) sandwiched therebetween.
Abstract:
The present invention provides a variabel optical modulator for optical communication systems using a tunable dynamic grating. The variable optical modulator comprises a gel or membrane layer attached adjacent to a prism communicating light to/from said optical communication system, a substrate having a plurality of indevidually adressable electrodes and drive means for providing regulated excitation voltage to each of said plurality of electrodes providing a wave pattern on a surface of said gel or membrane superimposed on an initial state of said gel or membrane layer.
Abstract:
An optical diffusion film comprises a plurality of diffraction grating cells formed on a substrate, each cell comprising a plurality of curved gratings disposed in parallel with each other and containing the same profile. Such film can be manufactured by embossing, using an original plate formed by etching a photosensitive material by means of an electronic beam exposure system to produce gratings. When such a film is provided with a reflection layer and exposed to light coming obliquely from above, highly bright and diffracted light is emitted in a predetermined direction.
Abstract:
An electro-optic polarizor, grating assembly or cell (10) includes a first glass plate (12) to form the foundation of the cell. A first alignment surfactant (14) is coated on one surface of the first glass plate (12). Similarly, a second alignment surfactant (24) is coated on one surface of a second glass plate (22). A transparent interdigitated electrode pattern (30) is disposed between the second glass plate (22) and the second alignment surfactant (24). A thin film of homeotropically aligned nematic liquid crystal (40) is sandwiched between the first and second alignment surfactants (14) and (24) for applying a lateral electric field caused by the control voltage or signal (50) across the liquid crystal (40) to alter the optical properties of the liquid crystal (40) such that a polarization depended grating (60) is induced by the lateral electric field (50).