53results about How to "Small refractive index" patented technology

A substrate is provided with an abrasion resistance antireflection coating. The coated substrate includes a multilayer antireflection coating on at least one side. The coating has layers with different refractive indices, wherein higher refractive index layers alternate with lower refractive index layers. The layers having a lower refractive index are formed of silicon oxide with a proportion of aluminum, with a ratio of the amounts of aluminum to silicon is greater than 0.05, preferably greater than 0.08, but with the amount of silicon predominant relative to the amount of aluminum. The layers having a higher refractive index include a silicide, an oxide, or a nitride.

The present invention is a semiconductor structure for light emitting devices that can emit in the red to ultraviolet portion of the electromagnetic spectrum. The semiconductor structure includes a first cladding layer of a Group III nitride, a second cladding layer of a Group III nitride, and an active layer of a Group III nitride that is positioned between the first and second cladding layers, and whose bandgap is smaller than the respective bandgaps of the first and second cladding layers. The semiconductor structure is characterized by the absence of gallium in one or more of these structural layers.

The present invention is a semiconductor structure for light emitting devices that can emit in the red to ultraviolet portion of the electromagnetic spectrum. The semiconductor structure includes a first cladding layer of a Group III nitride, a second cladding layer of a Group III nitride, and an active layer of a Group III nitride that is positioned between the first and second cladding layers, and whose bandgap is smaller than the respective bandgaps of the first and second cladding layers. The semiconductor structure is characterized by the absence of gallium in one or more of these structural layers.

The main object of the present invention is to provide a colour filter with a retardation layer, capable of minimising light leakage even in the case the visual angle is large in the black display state, for a liquid crystal display. The present invention achieves the object by providing a colour filter with a retardation layer comprising a substrate, a colour layer formed on the substrate, being arranged in a plurality of rows having different thicknesses according to each colour, a first retardation layer formed on the colour layer, made of a liquid crystalline polymer, having its optic axis perpendicular to a plane of the substrate so as to function as a C plate, and a second retardation layer the colour layer, wherein the optic axis of the second retardation layer is arranged parallel to the plane of the substrate so as to function as a positive Aplate with positive refractive index anisotropy, and the refractive index anisotropy of the second retardation layer in the visible light range decreases at shorter wavelenghts inverse dispersion characteristics.

An optical system is disclosed. The optical system comprising: a substrate; and a subwavelength photonic crystal waveguide atop the substrate, wherein the subwavelength photonic crystal waveguide comprises a periodic one or two-dimensional array of two or more interleaved dielectric pillars; wherein the periodicity of the one or two-dimensional array is constant, a combination of two or more periods, or random; wherein the one or two-dimensional array is substantially linear or curved; wherein each of the pillars of the one or two-dimensional array is at least one of a triangular prism, a trapezoidal prism, an elliptic cylinder, a cylinder, a tube, a frustum, a pyramid, a trapezoidal prism, and an asymmetric frustum; and wherein each of the pillars of the one or two-dimensional array comprises a solid, liquid, and/or gas. Other embodiments are described and claimed.

Disclosed is a light-receiving device comprising a substrate provided with at least one light-receiving element and a transparent cover (6) arranged above the surface of the substrate on which the light-receiving element is formed. A sealing member (5) is provided between the substrate and the transparent cover (6) at least in the region of the substrate surrounding the light-receiving element. This sealing member (5) is composed of a material containing cyclic olefin resin.

Disclosed is a resin material for optical use, which has refractive index and transparency suitable for optical devices, while having extremely small change in refractive index dependent on temperature. In addition, the resin material for optical use is excellent in forming suitability and heat resistance after a reflow process. Also disclosed is an optical device using a resin material for optical use. Specifically disclosed is a transparent resin material for optical use which is composed of a curable resin containing inorganic fine particles whose surfaces are modified with an organic compound. This transparent resin material for optical use is characterized in that the inorganic fine particles are composed of an amorphous silica containing a metal oxide crystal, and have an average particle diameter of not less than 1 nm but more than 50 nm.

A composite laser gain medium is comprised of a first rare-earth element doped core; and a second rare-earth element doped cladding, at least partially, adjacent to the core. A portion of the lasing by the cladding at one wavelength within the composite laser gain medium is absorbed by the core so as to cause lasing of the core at a different wavelength. At least two distinct rare earth element pairs may be used in embodiments: (1) thulium (Tm) as a cladding rare-earth dopant and holmium (Ho) as the core rare-earth dopant; and (2) ytterbium (Yb) as a cladding rare-earth dopant and erbium (Er) as the core rare-earth dopant. Other rare earth element pairs are also believed possible. The laser composite gain medium may be configured to have a slab, or a cylindrical geometry.

In a TTG-DFB-LD including a MQW wavelength control layer 16 whose refractive index varies by the current injection, the effective forbidden bandwidth of the MQW wavelength control layer 16 is larger by a value in the range of above 40 meV including 40 meV and below 60 meV excluding 60 meV than an energy of light generated in the MQW active layer 20.

A method for reducing loss in a subwavelength photonic crystal waveguide bend is disclosed. The method comprising: forming the subwavelength photonic crystal waveguide bend with a series of trapezoidal shaped dielectric pillars centered about a bend radius; wherein each of the trapezoidal shaped dielectric pillars comprise a top width, a bottom width, and a trapezoid height; wherein the length of the bottom width is greater than the length of the top width; and wherein the bottom width is closer to the center of the bend radius of the subwavelength photonic crystal waveguide bend than the top width. Other embodiments are described and claimed.

The present invention relates to 1, 4-bis(4-aminophenoxylmethylene)cyclohexane, which is white or light red crystal and has smelting point of 150-152 deg.c and chemical structure as shown. Its preparation process includes the reaction of 1, 4-cyclohexane dimethanol and p-halo nitrobenzene to obtain 1, 4-bis(4-nitrophenoxylmethylene)cyclohexane, and the further reaction with active carbon, ferric trichloride hexahydrate, anhydrous alcohol and hydrazine hydrate to obtain 1, 4-bis(4-aminophenoxylmethylene)cyclohexane. The compound 1, 4-bis(4-aminophenoxylmethylene)cyclohexane may be polymerized to form polyimide material with alicyclic ring structure, and the polyimide material may find its wide application in liquid crystal display, optical fiber communication and other hi-tech fields.

A surface emitting semiconductor laser includes: a substrate; a first semiconductor multilayer reflector of a first conduction type that is formed on the substrate and is composed of stacked pairs of relatively high refractive index layers and relatively low refractive index layers; a cavity region that is formed on the first semiconductor multilayer reflector and includes an active region; and a second semiconductor multilayer reflector of a second conduction type that is formed on the cavity region and is composed of stacked pairs of relatively high refractive index layers and relatively low refractive index layers. A cavity length of a cavity that includes the cavity region and the active region between the first semiconductor multilayer reflector and the second semiconductor multilayer reflector is greater than an oscillation wavelength.

The present invention relates to an epoxy resin composition for optical use including the following ingredients (A) to (C): (A) an epoxy resin; (B) a curing agent; and (C) an inorganic filler including (c1) an inorganic filler having a refractive index larger than a refractive index of a cured product obtained from the ingredients of the epoxy resin composition excluding the (C) inorganic filler and (c2) an inorganic filler having a refractive index smaller than the refractive index of the cured product obtained from the ingredients of the epoxy resin composition excluding the (C) inorganic filler.

A display device that economically improves light entry efficiency and non-uniformity of luminance of a light guide plate includes a plurality of light sources arranged at specified intervals so as to face a plane of incidence of the light guide plate to illuminate a liquid crystal module from the rear such that the light guide plate is illuminated with light from the light sources passing through the plane of incidence of the light guide plate. An optically anisotropic member is disposed on the plane of incidence and is configured such that a refractive index along a vertical direction with respect to the plane of incidence of the light guide plate is relatively small and a refractive index along a parallel direction with respect to the plane of incidence is large compared to the relatively small refractive index.

An ink level detecting apparatus usable with an inkjet printer, which uses an optical fiber to detect the ink level. The ink level detecting apparatus includes: an ink tank having an ink outlet; an optical fiber disposed near the ink tank; a light source which is disposed at a front end of the optical fiber and emits light; a light receiving sensor which is disposed at a rear end of the optical fiber and senses light propagating through the optical fiber; and a pressuring unit which presses the optical fiber so as to bend the optical fiber according to the weight of the ink tank.