45results about How to "Different refractive index" patented technology

A light emitting device having a transparent substrate, a light emitting stack, and a transparent adhesive layer is provided. The light emitting stack is disposed above the transparent substrate and comprises a diffusing surface. The transparent adhesive layer is disposed between the transparent substrate and the diffusing surface of the light emitting stack; an index of refraction of the light emitting stack is different from that of the transparent adhesive layer.

A fluidic variable focal length optical lens has a sealed housing having a first fluidic chamber filled with a first fluidic medium and a second fluidic chamber filled with a second fluidic medium, the first and the second fluidic chamber being separated from each other by an elastic membrane, wherein the first and the second fluidic medium have different refractive indices, and a deformator configured to deform the membrane laterally within a pump zone, thereby laterally displacing the first fluidic medium from the pump zone to a lens zone and the second fluidic medium from the lens zone to the pump zone, so that the membrane also deforms in the lens zone and changes a focal length of the lens zone along a normal direction.

An optical medium has a graded effective refractive index with a high maximum refractive index change. The medium is formed using alternating layers of two or more materials having significantly different refractive indices. The thickness of the layers of at least one of the materials is substantially less than the effective light wavelength of interest. The effective index of refraction in a local region within the medium depends on the ratio of the average volumes of the two materials in the local region. A graded index of refraction is provided by varying the relative thicknesses of the two materials.

A light-emitting device having a substrate, a light-emitting stack, and a transparent connective layer is provided. The light-emitting stack is disposed above the substrate and comprises a first diffusing surface. The transparent connective layer is disposed between the substrate and the first diffusing surface of the light-emitting stack; an index of refraction of the light-emitting stack is different from that of the transparent connective layer.

The invention discloses a spatial light modulator-based dual-beam optical tweezers system. The system includes a laser, a first telescope system, a half wave plate, a first reflector, a spatial light modulator, a quarter-wave plate, a focusing lens, a second reflector, a second telescope system, an objective lens and a sample stage which are arranged sequentially along an optical path, wherein the half wave plate is used for adjusting the ratio of horizontal polarized light and vertical polarized light in a received beam, the first reflector is used for reflecting the received beam to a corresponding modulation area on the spatial light modulator, and the spatial light modulator is provided with two modulation areas loaded with different phase image information; the beam is subjected to phase modulation once, and then, the phase-modulated beam passes through the quarter-wave plate and the focusing lens, and thereafter is reflected by the second reflector; the reflected beam passes through the focusing lens and the quarter-wave plate again, and arrives at the other modulation region of the spatial light modulator, and thereafter, passes through the second telescope system and the objective lens sequentially, and arrives at the sample stage. With the spatial light modulator-based dual-beam optical tweezers system of the invention adopted, the application range of the optical tweezers can be greatly extended, and experiment accuracy can be improved.

This invention relates to a branch-type silicone oil with a structural formula which R1, R2 and R3 represent alkyl or aryl and methyl, ethyl and phenyl are considered in prior. R1, R2 and R3 can be the same or not. The polymerization degree n is an integral between 1 and 100. This invention also relates to the method to prepare the branch-type phenyl silicone oil. The branch-type phenyl silicone oil is smell-less and colorless transparent liquid, with the characteristics of low viscosity and high refractive index. It is compatible with kinds of cosmetic raw materials and contains no heavy metal.

An imaging optical system includes an image forming optical system forming an image of an object, an imaging device placed in the proximity of the image of the object, a liquid crystal element placed at a preset position on the optical path between the object and the imaging device; and an optical element placed on the object side of the liquid crystal element. The optical element is constructed of a medium in which the transmittance of light at a wavelength of 500 nm is 20% or more and which exhibits different refractive indices with respect to light, the directions of vibrations of which are perpendicular to each other.

A long-wavelength VCSEL, and method of fabrication, includes a long-wavelength active region epitaxially grown on a compatible substrate with a high heat conductivity DBR mirror stack metamorphically grown on the active region. A supporting substrate is bonded to the DBR mirror stack and the compatible substrate is removed. A second mirror stack, either a DBR or a dielectric mirror stack, is formed on the opposite surface of the active region. Preferably, an InP based active region is grown on an InP based substrate and an AlAs/GaAs based metamorphic DBR mirror stack is metamorphically grown on the active region. The supporting substrate may be either an InP based substrate bonded to the active region or a layer of plated metal, such as copper, silver, gold, nickel, aluminum, etc.

This invention enhances gloss uniformity of a formed image surface by selectively using colorless inks according to dot layouts of colored inks. A dot-layout unit sets colored dot layouts for respective colors of colored ink data. A colorless-dot-layout unit sets a colorless dot layout for one colorless ink with reference to a colorless dot layout table according to the colored ink data. An image is formed according to the colored and colorless dot layouts. In the colorless dot layout table, when a specular glossiness calculated according to the colored dot layouts is high, the colorless dot layout is set to superpose a colorless ink having a low refractive index on a colored ink having a high refractive index. Conversely, when the specular glossiness is low, the colorless dot layout is set to superpose a colorless ink having a high refractive index on a colored ink having a low refractive index.

A variable focus (10) lens comprising a fluid chamber (12) containing a first fluid (14) and a second fluid (16) is disclosed. The fluids are non-miscible and in contact over a meniscus (18) and the second fluid is able to alter its shape on the influence of a magnetic field. The second fluid is preferably a ferrofluid. Means (20, 22) for applying a gradient magnetic field (24) over at least a part of the fluid chamber are provided that are capable of inducing a magnetic flux maximizing movement of the fluids, such that the shape of the meniscus varies in dependence on the magnetic field.

The invention discloses an alkynol compound containing a phenyl silicon-oxygen chain as well as a preparation method and application of the alkynol compound. The alkynol compound containing the phenylsilicon-oxygen chain has a structural formula shown in the descriptions of the invention. In the formula, a ranges from 5 to 20, b ranges from 0 to 10, c ranges from 3 to 6, and R1 is methyl or phenyl. Phenyl hydrogen-containing silicone oil, acrylic ester and methyl butynol are used as main raw materials and react with one another under the action of a catalyst to prepare the alkynol compound. According to the compound, the phenyl-containing silicon-oxygen chain segment is introduced into the methyl butynol structure; phenyl can improve the refraction coefficient of the compound, the silicon-oxygen chain segment can improve the compatibility of the compound with silica gel; and phenyl hydrogen-containing silicone oil with different phenyl contents and different silicon-oxygen chain lengths can be selected to adjust the refraction coefficient of the obtained compound and the compatibility with silica gel.