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:
Apr. 17, 2018
Filed:
Mar. 21, 2017
International Business Machines Corporation, Armonk, NY (US);
Darius Urbonas, Rueschlikon, CH;
INTERNATIONAL BUSINESS MACHINES CORPORATION, Armonk, NY (US);
Abstract
A surface-guiding photonic device includes a planar, tempered glass, comprising a bulk layer and a tempered superficial layer contiguous with the bulk layer. The superficial layer is at least partly exposed to air and has an intrinsic gradient refractive index in a direction z perpendicular to a main plane of the glass, whereas the bulk layer has a refractive index that is essentially constant along direction z. The average refractive index of the superficial layer is larger than each of: (i) the average refractive index of the bulk layer; and (ii) the refractive index of air. The glass can include lateral structures, e.g., trenches, extending parallel to the propagation direction y, so as for the device to have a rib waveguide-like configuration. The lateral structures form recesses in the superficial layer, so as to laterally confine radiation propagating in the tempered superficial layer, by total internal reflection.