Patent ID: 7432176

Claim:
A three-dimensional very fine patterning method comprising the steps of: preparing a substrate of a Group III-V compound semiconductor including Al x Ga y In 1-x-y As z P 1-z (0≦x<1, 0≦y, z≦1); throwing on the substrate surface an electron beam whose current density is controlled in respect of the diameter of the beam, thereby selectively substituting a Group III oxide for the natural oxide formed on the substrate surface or selectively forming a Group III oxide; raising the temperature of the substrate to a predetermined temperature to allow the parts other than those substituted for or formed to detach from the substrate surface; and allowing the selective crystal growth of a Group III-V compound semiconductor on the natural oxide stripping side, particularly on the part substituted for by the Group III oxide or the region other than the part substituted for by the Group III oxide according to the molecular beam epitaxy method using a solid growth material.