Optical article having directional micro- or nanostructured thin film coating, and its process
US11867876B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jun 13, 2019 |
| Grant date | Jan 9, 2024 |
| Priority date | — |
| Expiry date | Oct 21, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/157
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
An optical article includes a substrate with front and rear main faces, one main face coated with a columnar micro- or nano-structured coating. The substrate and optical article are transparent in at least a part of the visible region ranging from 380 to 780 nm, along at least one incidence angle. The columnar micro- or nano-structured coating includes an array of columns including each a core and an upper layer covering the core, the core and the upper layer being structurally and/or chemically different and have light absorbing properties with an extinction coefficient “k” ≥10-2 in the spectrum 250-2500 nm and are able to cause a change in transmission or in reflection of incident light through the optical article as a function of the angle of incidence of light. Also disclosed is a method for manufacturing an optical article including a columnar micro- or nano-structured coating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.