	US 11,867,876 B2
	Optical article having directional micro- or nanostructured thin film coating, and its process
William Trottier-Lapointe, Charenton-le-Pont (FR); Bruce Faure, Charenton-le-Pont (FR); Bill Baloukas, Montreal (CA); Richard Vernhes, Montreal (CA); Oleg Zabeida, Montreal (CA); Ludvik Martinu, Montreal (CA); Sasha Woodward, Montreal (CA); Nicolas Desjardins-Lecavalier, Montreal (CA); and Julien Gagnon, Montreal (CA)
Assigned to Corporation de l'Ecole Polytechnique de Montreal, Montreal (CA); and Essilor International, Charenton-le-Pont (FR)
Appl. No. 17/252,079
Filed by CORPORATION DE L'ECOLE POLYTECHNIQUE DE MONTREAL, Montreal (CA); and Essilor International, Charenton-le-Pont (FR)
PCT Filed Jun. 13, 2019, PCT No. PCT/EP2019/065529 § 371(c)(1), (2) Date Dec. 14, 2020, PCT Pub. No. WO2019/238836, PCT Pub. Date Dec. 19, 2019.
Claims priority of application No. 18305738 (EP), filed on Jun. 15, 2018.
Prior Publication US 2021/0263195 A1, Aug. 26, 2021
Int. Cl. G02B 1/118 (2015.01); C03C 17/34 (2006.01); C23C 14/08 (2006.01); C23C 14/10 (2006.01); C23C 14/22 (2006.01); C23C 14/30 (2006.01); C23C 16/34 (2006.01); C23C 16/455 (2006.01); C23C 16/56 (2006.01); C23C 28/04 (2006.01); G02C 7/10 (2006.01)

CPC G02B 1/118 (2013.01) [C03C 17/3435 (2013.01); C23C 14/083 (2013.01); C23C 14/10 (2013.01); C23C 14/226 (2013.01); C23C 14/30 (2013.01); C23C 16/34 (2013.01); C23C 16/45555 (2013.01); C23C 16/56 (2013.01); C23C 28/042 (2013.01); G02C 7/104 (2013.01); C03C 2217/213 (2013.01); C03C 2217/219 (2013.01); C03C 2217/281 (2013.01); C03C 2217/73 (2013.01); C03C 2217/78 (2013.01); C03C 2217/948 (2013.01); C03C 2218/151 (2013.01); C03C 2218/152 (2013.01)]

20 Claims

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 10⁻²in 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%.