1367results about How to "Low refractive index" patented technology

This invention provides composite materials comprising nanostructures (e.g., nanowires, branched nanowires, nanotetrapods, nanocrystals, and nanoparticles). Methods and compositions for making such nanocomposites are also provided, as are articles comprising such composites. Waveguides and light concentrators comprising nanostructures (not necessarily as part of a nanocomposite) are additional features of the invention.

In certain embodiments of this invention, an improved multilayer anti-reflection (AR) coating is provided on the exterior surface of the front glass substrate of a photovoltaic device. This AR coating functions to reduce reflection of desirable wavelengths from the front glass substrate, thereby allowing more light within the desirable solar spectrum to pass through the incident glass substrate and reach the photovoltaic semiconductor film so that the photovoltaic device can operate more efficiently. Also, the AR coating can reduce the amount of undesirable light (e.g., at least some IR and/or UV radiation) which reaches the semiconductor film of the device. In certain example embodiments, the multilayer AR coating includes a plurality of pairs of alternating high refractive index and low refractive index layers.

There is disclosed an anti-reflection film comprising 5-65% by volume of inorganic fine particles having an average particle size of 1-200 nm and having a core/shell structure, and 35-95% by volume of a polymer, wherein a high-refractive-index layer having a refractive index of 1.65-2.40 and a low-refractive-index layer having a refractive index of 1.30-1.55 are laminated. There is also disclosed a polarizing plate and image display device utilizing the anti-reflection film. The anti-reflection film is suitable for mass production.

Multilayer optical films are comprised of materials with glass transition temperatures below room temperature (<30° C.). The high refractive index polymers are unique in that they exhibit mechanical properties similar to other low Tg semi-crystalline polymers, yet have significant birefringence (>0.05) when strain induced oriented. Novel combinations of comonomers for thermoplastics control the rate of crystallinity for improved processability and flexibility, giving the films crease and crumple recovery advantages.

A wide field of view monocentric lens system for an infrared aerial reconnaissance camera includes front and rear lens shell elements and a core lens element, with the number of front and rear shell lens elements depending on the IR band of interest (LWIR, MWIR or SWIR). Infrared radiation entering the monocentric lens passes sequentially through the front shell lens element(s), the core lens element, and the rear shell lens element(s) and is focused onto a curved focal surface. The front shell lens element(s) and the rear shell lens element(s) are made of material having a relatively higher refractive index or a relatively higher optical dispersion, or both, in the band of interest, as compared to the core lens element.

A large mode area optical fiber includes a large diameter core (d1 up to 60 μm), and a first cladding (diameter d2) wherein the difference between refractive index (n1) in the core and the first cladding (n2) is very small (Δn<0.002), thus providing a very low numerical aperture core (NA1 between 0.02 and 0.06). The preferred ratio of d2/d1<2. The fiber further has a second cladding, preferably a layer of air holes, having a very low refractive index n3 as compared to the core and first cladding such that the first cladding has a relatively high numerical aperture (NA2>0.4) (n3 is preferably less than 1.3). The small change in refractive index between the core and inner cladding combined with a large change in refractive index between the first cladding and second cladding provides a significantly improved single mode holding waveguide.

The invention relates to a nanometer cellulose/polyvinyl alcohol gel composite material, which is characterized by comprising hydrogel and aerogel. A preparation method of the nanometer cellulose/polyvinyl alcohol gel composite material comprises the following process steps of 1, nanometer cellulose preparation by a chemical combination mechanical treatment method; 2, composite hydrogel preparation; and 3, composite aerogel preparation. The nanometer cellulose/polyvinyl alcohol gel composite material has the advantages that the composite aerogel belongs to a porous amorphous solid material consisting of nanometer level colloid particles or high-polymer molecules, and a unique open nanometer level porous structure and a continuous three-dimensional reticular structure are adopted, so the density is extremely low, the specific surface area is high, and the porosity is high, wherein the solid phase of the aerogel accounts for 0.2 percent to 20 percent of the total volume percentage, the characteristics of high adsorption catalytic capability, low thermal conductivity, low sound resistance, low refractive index and the like are shown, and wide application prospects are realized in the fields of aviation, spaceflight, chemical industry, metallurgy, energy-saving building and the like.

A pretreatment method for use in manufacturing an improved optical component comprises (i) providing a polymeric optical substrate; and (ii) exposing the polymeric optical substrate to electromagnetic energy having a wavelength of about 30 nm to about 350 nm. The exposure of the polymeric optical substrate to the electromagnetic energy substantially improves adhesion between the substrate and an optical coating deposited onto the substrate following pretreatment. The invention addresses the significant need for coated plastic optics by providing a method to achieve reliable adhesion of optical coatings placed on polymeric optical substrates. Specifically, this invention enables improved adhesion for even highly curved or shaped parts which have been historically more difficult to coat. The pretreatment method is particularly useful for molded substrates such as molded polymethylmethacrylate.

Disclosed herein are novel amorphous tetrafluoroethylene-hexafluoropropylene (TFE-HFP) dipolymers, and other copolymers containing TFE, HFP and a third monomer, many of which are more random than previous amorphous TFE-HFP copolymers, as well as a novel high productivity continuous process for making these polymers. The polymers are particularly useful in the form of coatings, films and encapsulants.

A film-forming composition comprising (a) a block copolymer that comprises: at least a polymer block [A] containing a specific fluorine-containing alicyclic structure; at least a polymer block [B] containing a specific siloxane structure; and a repeating unit (H) having at least one reactive group capable of being involved in crosslinking reaction, the repeating unit (H) being in at least one of the polymer block [A] and the polymer block [B], and (b) at least one of a curing agent and a curing accelerator.

The invention relates to electrophoretic displays comprising core-shell pigment particles having a core of low specific gravity and low refractive index and a shell of high refractive index.

Provided is a film having a low refractive index, which can be formed under normal temperature and pressure while obtaining a lower refractive index, has excellent adhesion with a solid substrate, and does not lose geometric optical properties, such as the diffusibility or light-harvesting capability attributed to the microstructure. Also disclosed is a method for producing the same. The film having a low refractive index is obtained by causing an electrolyte polymer and microparticles to be alternately adsorbed on the surface of a solid substrate and bringing the resulting microparticle-laminated film into contact with a silicon compound solution in order to bond the solid substrate with microparticles and microparticles with microparticles. The silicon compound solution is selected from (1) the hydrolysis product of alkoxysilane (I) wherein the functional groups are formed from hydrolyzable groups and non-hydrolyzable organic groups, and the condensation reaction product thereof, (2) the hydrolysis product of a mixture of alkoxysilane (I) and alkoxysilane (II) wherein the functional groups are formed from hydrolyzable groups alone, and the condensation reaction product thereof; and (3) a mixture of hydrolysis product and condensation product thereof according to (1) and alkoxysilane (II).

An optical film having an optically-transparent substrate, and a low refractive index layer having a thickness d on one side of the optically-transparent substrate, a polarizing plate and a display panel provided with the same, and a display provided with the same.

An economic, optically transmissive, stain and ink repellent, durable low refractive index fluoropolymer composition for use in an antireflection film or coupled to an optical display. In one aspect of the invention, the composition is formed from the reaction product of a fluoropolymer and a fluoroalkyl containing multi-olefinic crosslinker. In another aspect of the invention, the composition further includes surface modified inorganic nanoparticles.

An optical recording medium includes a substrate and a plurality of recording layers laminated via at least intermediate layers, at least one of the recording layers other than a recording layer farthest from a light incidence plane among the plurality of recording layers containing at least one metal M selected from a group consisting of Ni, Cu, Si, Ti, Ge, Zr, Nb, Mo, In, Sn, W, Pb, Bi, Zn and La and an element X which can combine with the metal M upon being irradiated with a laser beam for recording data, thereby forming a crystal of a compound of the element X with the metal M. According to the thus constituted optical recording medium, it is possible to record data in and reproduce from a farthest recording layer from a light incidence plane in a desired manner and it is possible to record data in and reproduce from recording layer(s) other than the farthest recording layer from the light incidence plane in a desired manner.

Biosensors are disclosed based on one- or two-dimensional photonic-crystal reflectance filters operating at near-ultraviolet wavelengths. Rigorous Coupled-Wave Analysis simulations predict a more tightly confined resonant electric field at the surface of this biosensor as compared to previously fabricated near-infrared photonic-crystal biosensors. This change in the resonant electric field provides an improvement of over 4.5 times in the surface-sensitivity to bulk-sensitivity ratio, and therefore enables enhanced detection resolution for biomolecules adsorbed on the biosensor surface. These new biosensors can be fabricated in mass by replica molding. They are especially well suited for applications requiring the detection of small molecules or ultra-low analyte concentrations.

The invention discloses an optical measurement method and devices used for measuring film thickness and refractive index. Light emitted out of a broadband light source generates an interference signal through interference structure, the spectrum information of the interference signal is detected and the fourier transform of the spectrum information is carried out, thus obtaining the optical path difference information of two optical paths which can generate the interference signal. Under known refractive index, a sample is arranged in an interference arm in the same type and is measured again, and the film thickness can be obtained by comparing the information of twice optical path differences. If the refractive index is unknown, the film is required to be rotated by an angle, and the refractive index and the thickness of the film can be worked out by the measurement of a third time. The optical measurement method and the devices used for measuring film thickness and refractive index adopt an optical method and have no damage to the sample; the resolution is micro level and the measured range can achieve millimeter level. Furthermore, the sample is not required to be strictly attached onto a sample platform; meanwhile, the information processing method is simple, and the information of the thickness and the refractive index of transparent or half-transparent film can be conveniently obtained in real time.

An active matrix type organic light emitting diode display serving as a bottom emission type device coupling out emission of an organic electroluminescence layer from a substrate where thin film transistors are formed or as a top emission type device coupling out the emission on the opposite side to the substrate. In a suitable layer (102, 106, 107) in each device, an insulating film containing SiO is formed. The insulating film is porous with nano pores in the film. The porous insulating film is controlled as to film density, film refractive index, nano pore diameter in film, average nano pore diameter in film and maximum nano pore diameter in film so that the refractive index is lower than that of a transparent electrode or a transparent substrate of the display holding the organic electroluminescence layer therebetween, and nano pores are present in the film. Light scattering effect can be obtained so that emission from the organic electroluminescence layer (110) can be coupled out to the outside efficiently.

An accommodative intraocular lens (IOL) system is disclosed for insertion into an eye to provide accommodative vision, the system including a deformable air chamber filled with a transparent, low refractive index medium disposed between the first and second optics; and at least one haptic connected to the air chamber and configured to facilitate a change in the curvature of at least one surface of the chamber, such that when the lens system is positioned in an eye, cilliary muscle movements can alter the curvature of the air chamber and vary the overall lens power of the system.