US 12,392,934 B2
Optical device with surface texturing extending through coating layer into substrate
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, Paris (FR)
Appl. No. 17/771,505
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/FR2020/051933
§ 371(c)(1), (2) Date Apr. 25, 2022,
PCT Pub. No. WO2021/079077, PCT Pub. Date Apr. 29, 2021.
Claims priority of application No. 1911937 (FR), filed on Oct. 24, 2019.
Prior Publication US 2022/0365249 A1, Nov. 17, 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)] 15 Claims
OG exemplary drawing
 
1. An optical device, suitable for transmitting/reflecting electromagnetic radiation in a wavelength range of an electromagnetic spectrum, said device comprising:
a substrate made of a first material chosen from the following materials:
silicon Si, germanium Ge, zinc sulphide ZnS, zinc selenide ZnSe,
a coating layer formed on a first side of the substrate and made of a second material, different from the first material, this second material being chosen from the following materials: silicon Si, germanium Ge, zinc sulphide ZnS, zinc selenide ZnSe, tantalum pentoxide Ta2O5, hafnium dioxide HfO2, alumina Al2O3,
at least a rear layer formed on a second side of the substrate opposed to the first side and having an optical function different from the coating layer, said rear layer being made of a material different from the substrate and from the coating layer, and
a surface having a plurality of cavities formed by surface texturing in a pattern forming a varying effective refraction index,
wherein the plurality of cavities are extending through the coating layer and are partially sunk into the substrate,
wherein the optical device is suitable for transmitting/reflecting electromagnetic radiation in a wavelength range of the electromagnetic spectrum corresponding to an infrared radiation,
wherein the material of the rear layer is a member of a group consisting of: silicon Si, germanium Ge, zinc sulphide ZnS, and zinc selenide ZnSe.