Anti-reflection optical member

Patent metadata

Field	Value
Publication number	US-2016291207-A1
Application number	US-201615168532-A
Country	US
Kind code	A1
Filing date	May 31, 2016
Priority date	Dec 3, 2013
Publication date	Oct 6, 2016
Grant date	—

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. The dielectric layer has such a thickness that light reflected at the surface of the dielectric layer of incident light entering the laminated structure from the surface is interfered and canceled by light reflected at the interface between the dielectric layer and the metal-microparticle-containing layer.

First claim

What is claimed is:

1 . An anti-reflection optical member that prevents incident light with a predetermined wavelength from being reflected and that is used in a predetermined medium, the anti-reflection optical member having a laminated structure in which the following are laminated in this order:
a transparent substrate that has a first refractive index greater than that of the predetermined medium; a metal-microparticle-containing layer that contains a plurality of metal microparticles; and a dielectric layer that has a second refractive index greater than that of the predetermined medium, wherein at least 60% of all the plurality of metal microparticles are flat metal particles each of which has a ratio of diameter to thickness of equal to or greater than 3, wherein main flat surfaces of the flat metal particles are oriented in a plane at in a range of 0° to 30° to a surface of the metal-microparticle-containing layer, wherein in the metal-microparticle-containing layer, the plurality of metal microparticles is disposed without forming a conductive path, and wherein a thickness of the dielectric layer is a thickness at which light reflected on a surface of the dielectric layer in a case where the incident light enters the laminated structure from the surface of the dielectric layer interferes with and is canceled out by light reflected on an interface between the dielectric layer and the metal-microparticle-containing layer.

2 . The anti-reflection optical member according to claim 1 , wherein the predetermined wavelength is a wavelength shorter than a plasmon resonance wavelength of the flat metal particles.

3 . The anti-reflection optical member according to claim 1 , wherein a thickness of the dielectric layer is equal to or less than 400 nm.

4 . The anti-reflection optical member according to claim 2 , wherein a thickness of the dielectric layer is equal to or less than 400 nm.

5 . The anti-reflection optical member according to claim 1 , wherein the thickness of the dielectric layer is a thickness which is equal to or less than an optical path length of λ/4 when the predetermined wavelength is set as λ.

6 . The anti-reflection optical member according to claim 2 , wherein the thickness of the dielectric layer is a thickness which is equal to or less than an optical path length of λ/4 when the predetermined wavelength is set as λ.

7 . The anti-reflection optical member according to claim 3 , wherein the thickness of the dielectric layer is a thickness which is equal to or less than an optical path length of λ/4 when the predetermined wavelength is set as λ.

8 . The anti-reflection optical member according to claim 4 , wherein the thickness of the dielectric layer is a thickness which is equal to or less than an optical path length of λ/4 when the predetermined wavelength is set as λ.

9 . The anti-reflection optical member according to claim 1 , wherein the incident light with the predetermined wavelength is visible light.

10 . The anti-reflection optical member according to claim 2 , wherein the incident light with the predetermined wavelength is visible light.

11 . The anti-reflection optical member according to claim 3 , wherein the incident light with the predetermined wavelength is visible light.

12 . The anti-reflection optical member according to claim 4 , wherein the incident light with the predetermined wavelength is visible light.

13 . The anti-reflection optical member according to claim 1 , wherein the flat metal particles have a diameter that is equal to or less than 300 nm.

14 . The anti-reflection optical member according to claim 1 , wherein the metal microparticles are made of silver.

15 . The anti-reflection optical member according to claim 1 , wherein the first refractive index is less than 1.8.

16 . The anti-reflection optical member according to claim 1 , wherein in the metal-microparticle-containing layer, at least 50% of the plurality of metal microparticles are disposed to be isolated from each other.

17 . The anti-reflection optical member according to claim 1 , comprising a high-refractive index layer that has a third refractive index greater than the first refractive index between the transparent substrate and the metal-microparticle-containing layer.

18 . The anti-reflection optical member according to claim 1 , wherein an area ratio between the plurality of metal microparticles and the metal-microparticle-containing layer in plan view is equal to or greater than 5% and equal to or less than 70%.

19 . The anti-reflection optical member according to claim 1 , wherein a transmittance of the incident light is equal to or greater than 80%.

20 . The anti-reflection optical member according to claim 1 , wherein a wavelength bandwidth, at which a reflectance of the incident light is equal to or less than 0.5%, is equal to or greater than 100 nm.

Assignees

• Fujifilm Corp

Inventors

• Yasuda Hideki
• MATSUNO Ryou
• Tani Takeharu

Classifications

• G02B5/008

  Surface plasmon devices (diffractive gratings with a pitch less than or comparable to the wavelength G02B5/1809; surface plasmons in integrated optics G02B6/1226; optical analysis of materials by means of surface plasmons G01N21/553) · CPC title

• B32B2551/00

  Optical elements · CPC title

• G02B5/282

  reflecting for infrared and transparent for visible light, e.g. heat reflectors, laser protection · CPC title

• G02B1/16

  having an anti-static effect, e.g. electrically conducting coatings · CPC title

• B32B2264/105

  Metal · CPC title