Wafer level creation of multiple optical elements
View Patent ↗Integrated multiple optical elements may be formed by bonding substrates containing such optical elements together or by providing optical elements on either side of the wafer substrate. The wafer is subsequently diced to obtain the individual units themselves. The optical elements may be formed lithographically, directly, or using a lithographically generated master to emboss the elements. Alignment features facilitate the efficient production of such integrated multiple optical elements, as well as post creation processing thereof on the wafer level.
1. An optical element comprising:
a substrate having a first surface and a second surface;
a first optical element having optical power therein on one of the first and second surfaces, the first optical element being a lithograph; and
a feature, in addition to the first optical element, on at least one of the first and second surfaces, the feature being created by simultaneously removing or adding material from the at least one of the first and second surfaces.
2. The optical element as claimed in claim 1 , wherein the first optical element includes a diffractive element for providing at least one of beam splitting, creating multiple spots and diffusely illuminating a specific area.
3. The optical element as claimed in claim 2 , wherein the diffractive element is a plurality of diffractive elements.
4. The optical element as claimed in claim 1 , wherein the substrate is a wafer and the first optical element is an array of optical elements.
5. The optical element as claimed in claim 1 , wherein the feature includes metal portions far blocking light.
6. The optical element as claimed in claim 1 , wherein the feature includes metal portions for assisting in bonding an active element to the optical element.
7. The optical element as claimed in claim 1 , further comprising a second optical element on another of the first and second surfaces.
8. The optical element as claimed in claim 7 , wherein the second optical element is created lithographically.
9. The optical element as claimed in claim 1 , wherein the feature is a lithograph.
10. The optical element as claimed in claim 1 , wherein the feature is opaque.
11. The optical element as claimed in claim 1 , wherein the first optical element is a replica of a lithographic master.
12. The optical element as claimed in claim 1 , wherein the substrate includes more than one substrate secured together, the first surface being on any surface of the more than one substrate and the second surface being on any surface of the more than one substrate, other than the first surface.
13. The optical element as claimed in claim 1 , wherein the feature is a mating feature for aligning the substrate.