Abstract: Provided are a high refractive index film including a high refractive index layer including a binder and flat metal particles, in which a value obtained by dividing an average particle diameter of the flat metal particles by an average thickness is 3 or more, a main plane of the flat metal particles is plane-oriented in a range of 0° to 30° with respect to a surface of the high refractive index layer, a volume fraction of the flat metal particles of the high refractive index layer is 20 volume % or more, and the flat metal particles are stacked in two or more layers, and an optical interference film using the high refractive index film.

Abstract: Provided are a high refractive index film including a high refractive index layer including a binder and flat metal particles, in which a value obtained by dividing an average particle diameter of the flat metal particles by an average thickness is 3 or more, a main plane of the flat metal particles is plane-oriented in a range of 0° to 30° with respect to a surface of the high refractive index layer, a volume fraction of the flat metal particles of the high refractive index layer is 20 volume % or more, and the flat metal particles are stacked in two or more layers, and an optical interference film using the high refractive index film.

Abstract: An anti-reflection optical member has a laminated structure including: a transparent substrate having a first refractive index greater than that of a predetermined medium; a metal-microparticle-containing layer containing metal microparticles; and a dielectric layer having a second refractive index greater than that of the predetermined medium, in this order. At least 60% of the metal microparticles are flat particles with a diameter-to-thickness ratio of 3 or more. Principal planes of the flat metal particles are surface-oriented in the range from 0° to 30° relative to the surface of the metal-microparticle-containing layer. In the metal-microparticle-containing layer, the metal microparticles are disposed without forming a conductive path.

Abstract: An antireflection film includes a transparent substrate; and an antireflection layer provided on one surface side of the transparent substrate, in which the antireflection layer is formed by laminating, from the transparent substrate side, a silver nanoparticle layer formed by dispersing a plurality of silver nanoparticles of which an aspect ratio is greater than or equal to 3 in a binder, and a layer of low refractive index having a refractive index lower than a refractive index of the transparent substrate, in this order, and the silver nanoparticle layer contains a metal more noble than silver.

Abstract: Provided are an antireflection film having high durability and a functional glass including the antireflection film. An antireflection film includes a transparent substrate (10), an antireflection layer (30) provided on one surface side of the transparent substrate (10), and a hard coat layer (20) included between the transparent substrate (10) and the antireflection layer (30), in which the antireflection layer (30) is formed by laminating, from the hard coat layer (20) side, a layer of high refractive index (32) having a refractive index higher than a refractive index of the hard coat layer (20), a silver nano-disk layer (36) formed by dispersing a plurality of silver nano-disks (35) in a binder (33), and a layer of low refractive index (38) having a refractive index lower than the refractive index of the layer of high refractive index (32) in this order.

Abstract: A multilayer structure including a metal particles-containing layer, a layer A having a refractive index, n1, and a layer B having a refractive index, n2, and satisfying one of the conditions (1-1) and (2-1) is capable of suppressing reflection of light at a wavelength ? intended to prevent reflection. n1<n2 and ?/4+m?/2<n1×d1<?/2+m?/2??Condition (1-1) n1>n2 and 0+m?/2<n1×d1<?/4+m?/2??Condition (2-1) wherein m represents an integer of 0 or greater; ? represents a wavelength with a unit of nm intended to prevent reflection; n1 represents a refractive index of the layer A; and d1 represents a thickness with a unit of nm of the layer A.

Abstract: Provided is an antireflection optical member which is an antireflection structure for preventing reflection from a substrate, the antireflection optical member including a laminate structure including a dielectric layer, an ultra-low refractive index layer, and the substrate that are laminated in this order, in which the ultra-low refractive index layer has a metamaterial structure in which a host medium includes guests having a smaller size than a wavelength ? of light whose reflection is to be prevented, a real part n2 of a refractive index of the ultra-low refractive index layer satisfies n2<1, a physical thickness d2 of the ultra-low refractive index layer satisfies the following Expression 1, and the dielectric layer satisfies the following Expression 2.

Abstract: An antireflection film includes an antireflection structure which has different reflectivity with respect to light to be incident on front and back surfaces, and includes a silver nano-disk layer formed by dispersing a plurality of silver nano-disks in a binder, and a layer of low refractive index which is formed on a surface of the silver nano-disk layer and has a refractive index smaller than a refractive index of the transparent substrate, and in which a ratio of a diameter of the silver nano-disk to a thickness is greater than or equal to 3, an area ratio of the silver nano-disk to the silver nano-disk layer is from 10% to 40%, and a pair of antireflection films having reflection conditions different from each other adhere to both surfaces of glass.

Abstract: An anti-reflection optical member has a laminated structure including: a transparent substrate having a first refractive index greater than that of a predetermined medium; a metal-microparticle-containing layer containing metal microparticles; and a dielectric layer having a second refractive index greater than that of the predetermined medium, in this order. At least 60% of the metal microparticles are flat particles with a diameter-to-thickness ratio of 3 or more. Principal planes of the flat metal particles are surface-oriented in the range from 0° to 30° relative to the surface of the metal-microparticle-containing layer. In the metal-microparticle-containing layer, the metal microparticles are disposed without forming a conductive path.

Abstract: A multilayer structure including a metal particles-containing layer, a layer A having a refractive index, n1, and a layer B having a refractive index, n2, and satisfying one of the conditions (1-1) and (2-1) is capable of suppressing reflection of light at a wavelength ? intended to prevent reflection. n1<n2 and ?/4+m?/2<n1×d1<?/2+m?/2??Condition (1-1) n1>n2 and 0+m?/2<n1×d1<?/4+m?/2??Condition (2-1) wherein m represents an integer of 0 or greater; ? represents a wavelength with a unit of nm intended to prevent reflection; n1 represents a refractive index of the layer A; and d1 represents a thickness with a unit of nm of the layer A.

Abstract: A heat ray shielding material having a metal particle-containing layer and a fine-particle containing overcoat layer disposed thereon wherein hexagonal to circular tabular metal particles are contained in 60% by number or more relative to total number of the metal particles contained in the metal particle-containing layer, a main plane of the hexagonal to circular, tabular metal particles is plane-oriented in a range of from 0° to ±30° on average relative to one surface of the metal particle-containing layer, exhibits favorable adhesion-failure resistance, scratch resistance and low haze.

Abstract: A heat ray shielding material having a metal particles-containing layer that contains at least one type of metal particles and a binder, wherein the thickness of the metal particles-containing layer is from 10 nm to 80 nm, the metal particles contain tabular metal particles having a hexagonal to circular form in a ratio of at least 60% by number, the binder in the tabular metal particles-containing layer has a crosslinking structure derived from a crosslinking agent, and the crosslinking group density ratio is from 0.3 to 30, has good visible light transmittance, heat shielding coefficient, scratch resistance and pencil hardness.

Abstract: A heat ray shielding material having a metal particles-containing layer that contains at least one type of metal particles, in which the thickness of the metal particles-containing layer is from 10 nm to 80 nm, the metal particles contain tabular metal particles having a hexagonal to circular form in a ratio of at least 60% by number, and the mean thickness of the hexagonal to circular, tabular metal particles is at most 14 nm has good visible light transmittance, heat shieldability (solar reflectance), surface profile and rubbing resistance.