Patent ID: 7947564

Claim:
A method of fabricating a mixed microtechnology structure, the method comprising: providing a provisional substrate including a sacrificial layer on which is formed a mixed layer including at least first patterns of a first material and second patterns of a second material different from the first material, wherein the first and second patterns reside adjacent the sacrificial layer, wherein providing a provisional substrate further comprises: providing a starting substrate including the sacrificial layer and a continuous preliminary layer; lithographically forming cavities in the preliminary layer from a face of the preliminary layer that is opposite the sacrificial layer, the cavities extending as far as the sacrificial layer; filling the cavities with the second material to form the second patterns and to form the mixed surface; forming a layer of planarization material on the mixed surface; polishing the layer of planarization material to have a continuous plane surface; and assembling a support substrate of a fourth material by bonding a surface of the support substrate to the continuous plane surface of the layer of planarization material; removing the sacrificial layer and exposing a mixed surface of the mixed layer, the mixed surface including portions of the first patterns and portions of the second patterns; and forming a continuous covering layer of a third material on the mixed surface by direct bonding.