US 12,287,453 B2
Multilayer optical device with surface texturing and extended cavities for electromagnetic radiation
Thomas Kämpfe, Corbas (FR); Laurent Dubost, Chamboeuf (FR); and Xxx Sedao, Saint-Etienne (FR)
Assigned to Hydromecanique et Frottement, Andrezieux-Boutheon (FR); Manutech-USD, Saint-Etienne (FR); Université Jean Monnet Saint-Etienne, Saint-Etienne (FR); and Centre National de la Recherche Scientifique (CNRS), Paris (FR)
Appl. No. 17/771,504
Filed by Hydromecanique et Frottement, Andrezieux-Boutheon (FR); Manutech-USD, Saint-Etienne (FR); Université Jean Monnet Saint-Etienne, Saint-Etienne (FR); and Centre National de la Recherche Scientifique, Paris (FR)
PCT Filed Oct. 26, 2020, PCT No. PCT/FR2020/051934
§ 371(c)(1), (2) Date Apr. 25, 2022,
PCT Pub. No. WO2021/079078, PCT Pub. Date Apr. 29, 2021.
Claims priority of application No. 1911937 (FR), filed on Oct. 24, 2019.
Prior Publication US 2022/0373718 A1, Nov. 24, 2022
Int. Cl. G02B 1/118 (2015.01); G02B 1/12 (2006.01); G02B 5/08 (2006.01); G02B 5/20 (2006.01)
CPC G02B 1/118 (2013.01) [G02B 1/12 (2013.01); G02B 5/0808 (2013.01); G02B 5/208 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An optical device (1), suitable for transmitting/reflecting electromagnetic radiation in a wavelength range of an electromagnetic spectrum, said device (1) comprising at least:
a first coating layer (10) made of a first material,
a substrate (50) made of a material different from the first material, and surface texturing (60) forming cavities (61) in the device (1);
wherein a lower layer (20; 50) disposed directly under the first coating layer (10) is either a second coating layer (20) made of a material different from the first material, or the substrate (50);
wherein the lower layer (20; 50) has a predetermined thickness (E20; E50);
characterized in that the cavities (61) extend through the first coating layer (10) and are sunk into the lower layer (20; 50) through at least part of the thickness (E20; E50), and in that the device comprises at least one rear layer (70) made of a material that is different from the substrate (50), the first coating layer (10) being formed on a first side of the substrate (50), the rear layer (70) being formed on a second side of the substrate (50) opposite the first side.