Patent ID: 8685777

Claim:
A method for fabricating a fixed structure having at least two elements respectively having at least one distinct vertical dimension in a volume defined by the fixed structure, the method comprising: an initial step of determining at least three thicknesses depending on the at least two vertical dimensions associated with the at least two elements; at least two successive steps of forming the at least two elements on a substrate of which at least one surface comprises an oxidizable material, each forming step comprising: a first forming step comprising thermally oxidizing a bare portion of the substrate to form an oxide layer to a thickness equal to one of the at least three thicknesses, and a second forming step comprising selectively etching the oxide layer relative to the thermally oxidizable material to define the volume in an etched portion of the oxide layer by baring the underlying substrate and to define at least one of the at least two elements in at least one unetched portion of the oxide layer; and a later step of thermally oxidizing the substrate to form, on a bare portion thereof, an oxide layer to a third thickness of the at least three thickness, so as to obtain the at least two elements having the at least two vertical dimensions and that are formed solely by the successive thermal oxidations of the substrate.