Patent ID: 7858407
Filing Date: 2010-12-28
Classification: H03H

Abstract:
1. A method for forming a microresonator comprising: forming a sacrificial portion above a substrate; forming a first semiconductor layer above the sacrificial portion structure; forming, in the first semiconductor layer, at least one electrode area placed against or above a peripheral portion of the sacrificial portion; forming an opening in the first semiconductor layer above the sacrificial portion, whereby said at least one electrode areas are level with the opening; forming a sacrificial layer covering the bottom, the wall, and the edges of the opening; forming a hole in the sacrificial layer at the bottom of the opening; forming a second semiconductor layer on the sacrificial layer; etching the second semiconductor layer to keep a portion forming a resonant element placed in the openings and slightly extending over the edges of the opening; and removing the sacrificial portion and layer, wherein the sacrificial portion and layer are formed of a material such as silicon-germanium which is selectively etchable with respect to the substrate, to the first semiconductor layer, and to the resonant element, and which is such that it enables forming a second single-crystal semiconductor layer at least in said opening.