Patent ID: 7297568

Claim:
A method for producing a three-dimensional structure composing silicon fine wires, the method comprising the steps of: preparing a silicon-on-insulator (SOI) substrate having a surface composed of the {100} surface of silicon single-crystals thereon; forming a silicon oxide film on a part of an SOI layer of the SOI substrate; forming a silicon nitride film on the silicon oxide film and the part of the SOI layer; removing a part of the silicon nitride film to expose the SOI layer such that elongated shapes are repeatedly arranged so as to be parallel to the <110> direction; removing the exposed SOI layer portions by wet etching; thermally oxidizing the {111} surface exposed by the wet etching to form a thermally-oxidized film; removing a part of the remaining silicon nitride film and wet etching the newly exposed SOI layer to form an array of silicon fine wires; and removing a buried oxide film of the SOI substrate to form silicon fine wires that can be independently oscillated, wherein the silicon fine wires are processed such that each fine wire has a different length.