Patent ID: 6479371
Filing Date: 2002-11-12
Classification: B82Y,G02B,H01L

Abstract:
A method for manufacturing a semiconductor device having a crystal structure with three-dimensional periodical refractive index distribution, characterized in that said method comprises:a wafer fabrication step of forming two semiconductor wafers each having one surface with at least one lattice layer being formed thereon, said lattice layer having a two-dimensional structure including a crystal lattice region as formed with a crystal lattice period and an adjustment lattice region with an adjustment lattice period greater than said crystal lattice period; a wafer hold step of integrally holding said two semiconductor wafers with said lattice layers facing each other; a first alignment step of irradiating a light beam onto said two semiconductor wafers being held integrally for detection of a lattice image obtained from said adjustment lattice region to thereby perform rough alignment between said semiconductor wafers; a second alignment step of irradiating laser light onto said two semiconductor wafers with rough alignment applied thereto for detection of a diffraction image obtained from said crystal lattice region to thereby perform fine alignment between said semiconductor wafers; and a wafer fusion step of fusing said two semiconductor wafers after completion of the fine alignment while letting said lattice layers facing each other be stacked over each other, wherein said light beam is non-coherent infrared light.