The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 12, 2018
Filed:
May. 17, 2017
United States of America, As Represented BY the Secretary of the Navy, Washington, DC (US);
Marc Christophersen, Berwyn Heights, MD (US);
Bernard F. Phlips, Great Falls, VA (US);
Michael K. Yetzbacher, Burke, VA (US);
Abstract
A device includes a surface profile optical element, including a substrate and a plurality of bi-layer stacks on the substrate. Each bi-layer stack of the plurality of bi-layer stacks includes a plurality of bi-layers. Each bi-layer of the plurality of bi-layers includes an etch-stop layer and a bulk layer. The etch stop layer includes an etch stop layer index of refraction. The bulk layer includes a bulk layer index of refraction. A ratio of the etch stop layer index of retraction and the bulk layer index of refraction is between 0.75 and 1.25.