Patent ID: 8361333

Claim:
A method to fabricate a shaped glass structure comprising: preparing a photosensitive glass substrate having a glass transformation temperature and having a composition comprising: 60-76 weight % silica, 6 weight %-16 weight % of a combination of K 2 O and Na 2 O with at least 3 weight % K 2 O, 0.001-1 weight % Ag 2 O, 0.75 weight %-7 weight % B 2 O 3 , and 5-8 weight % Al 2 O 3 , wherein the combination of B 2 O 3 , and Al 2 O 3 not exceeding 13 weight %, 8-15 weight % Li 2 O, and 0.04-0.1 weight % CeO 2 ; and patterning a structure in a surface of the photosensitive glass substrate; exposing at least a first portion of the photosensitive glass substrate to an activating energy source while leaving at least a second portion of said glass substrate unexposed; heating the glass substrate to a temperature near the glass transformation temperature to transform at least part of the exposed glass to a crystalline material; and etching the glass substrate in an etchant, wherein an etch ratio of exposed portion to said unexposed portion is at least 30:1 to provide a shaped glass structure with an aspect ratio of at least 30:1.