Patent ID: 11867876
Assignee: CORPORATION DE L'ECOLE POLYTECHNIQUE DE MONTREAL
Field: Surface technology, coating (Chemistry)
Classification: CPC G  C | IPC C  G

Claim 0:
1. An optical article comprising a substrate with a front main face and with a rear main face, at least one of the main faces being coated with a columnar micro- or nano-structured coating, wherein
the substrate and the optical article are transparent or can be put in a state where they are transparent in at least a part of the visible region ranging from 380 to 780 nm, along at least one incidence angle;
said columnar micro- or nano-structured coating comprises at least an array of columns comprising each a core and an upper layer covering said core, the core and the upper layer being structurally and/or chemically different and wherein said core and/or upper layer have light absorbing properties or can be put in a state where they have light absorbing properties with an extinction coefficient “k” equal to or higher than 10−2 in at least a part of the light spectrum ranging from 250 to 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, and
wherein the core of the columns has a porosity that is equal to or higher than 30%.