ANTI-REFLECTIVE OPTICAL MEMBER

摘要

There is provided an anti-reflection optical member having a small anti-reflection effect over a broad band and having optical characteristics such as high transmittance. This anti-reflection optical member has a laminated structure in which the following are laminated in this order: a transparent substrate (10) that has a first refractive index greater than that of a predetermined medium; a metal-microparticle-containing layer (12) that contains a plurality of metal microparticles (20); and a dielectric layer (14) that has a second refractive index greater than that of the predetermined medium. At least 60% of all the plurality of metal microparticles (20) are flat metal particles (20) in which the ratio of diameter to thickness is equal to or greater than 3. Principal planes of the flat metal particles (20) are oriented in a plane at in a range of 0° to 30° to a surface of the metal-microparticle-containing layer (12). In the metal-microparticle-containing layer (12), the plurality of metal microparticles (20) is disposed without forming a conductive path. A thickness of the dielectric layer (14) is a thickness at which light reflected on a surface of the dielectric layer (14) in a case where the incident light enters the laminated structure from the surface of the dielectric layer (14) interferes with and is canceled out by light reflected on an interface between the dielectric layer (14) and the metal-microparticle-containing layer (12).