Optical coating having nano-laminate for improved durability

US10955589B2 · kind B2 · utility

Assignee

• INTEVAC, INC. · US

Inventors

• Terry Bluck · Santa Clara, US
• Gaurav Saraf · Santa Clara, US
• James Craig Hunter · Los Gatos, US
• Changwan Hwang · San Jose, US
• Paul Johnson · Kaysville, US
• Jae Ha Choi · Haepyeong-myeon, KR

Key dates

• Filing date: Jun 1, 2018
• Grant date: Mar 23, 2021
• Expiry date: Feb 15, 2039

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C2218/155
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

An optical coating, such as anti-reflective coating (ARC) or colored coating for optical devices, suitable especially for mobile devices. The ARC is made up of alternating layers of low refractive index and high refractive index. At least one of the layers, preferably the top layer, is made up of nano-laminate. The nano-laminate is a structure of alternating nano-layers, each nano-layer made out of a material having refractive index similar to the layer it replaces. Optionally, each of the layers are made up of nano-laminates, such that a layer having low refractive index is made up of nano-laminates of nano-layers having low refractive index, while high index layers are made up of nano-lamonate of nano-layers having high refractive index. Each of the nano-layers is of 2-10 nanometer thickness.