	US 12,189,086 B2
	Optical transmission element, having a super-hydrophobic nanostructured surface having an anti-reflective property and covered with a compliant high-density thin film deposit
Raphaël Aubry, Palaiseau (FR); Gaëlle Lehoucq, Palaiseau (FR); Raphaël Guillemet, Palaiseau (FR); Julie Cholet, Palaiseau (FR); José-Paolo Martins, Palaiseau (FR); Mane-Si-Laure Lee Bouhours, Palaiseau (FR); and Anne Delboulbe, Palaiseau (FR)
Assigned to THALES, Courbevoie (FR)
Appl. No. 17/436,978
Filed by THALES, Courbevoie (FR)
PCT Filed Mar. 4, 2020, PCT No. PCT/EP2020/055608 § 371(c)(1), (2) Date Sep. 7, 2021, PCT Pub. No. WO2020/178304, PCT Pub. Date Sep. 10, 2020.
Claims priority of application No. 1902313 (FR), filed on Mar. 7, 2019.
Prior Publication US 2022/0179127 A1, Jun. 9, 2022
Int. Cl. G02B 1/00 (2006.01); G02B 1/18 (2015.01)

CPC G02B 1/18 (2015.01) [G02B 2207/101 (2013.01)]

11 Claims

1. An optical element, which is transparent at a wavelength of use λ, comprising a super-hydrophobic nanostructured surface that has an anti-reflection property, said surface comprising an array of pads, wherein the pads have a nanoscale width, a height h, an aspect ratio of less than 1/2, the pitch p of the array is such that p<h and the element comprises a top layer of thickness less than h/5 which covers without discontinuity and conformally said nanostructured surface, said top layer being obtained via a step of annealing at a temperature comprised between 500° C. and 1200° C. and being in a material of a hardness greater than the hardness of the material of said nanostructured surface.