Patent ID: 8153530

Claim:
A method of manufacturing a semiconductor device including an optical grating having a periodic corrugation pattern, the method comprising the steps of: forming an optical grating layer on a semiconductor substrate; forming an etching mask layer on the optical grating layer; preparing a nano-stamper having a stamping face including a periodic corrugation pattern, and subsequently pressing the stamping face of the nano-stamper onto a surface of the etching mask layer such that a remaining layer, from a top surface of corrugation of the stamping face of the etching mask layer to a surface of the optical grating layer, remains with a predetermined thickness; forming a mask pattern by removing the remaining layer of the etching mask layer by dry etching using plasma; and forming an optical grating on the optical grating layer by etching the optical grating layer using the etching mask layer as a mask, wherein the etching mask layer comprises a first layer formed on the optical grating layer and a second layer formed on the first layer, and the second layer is made of a UV-curing resin and the first layer is made of a resin that exhibits an etching rate greater than the second layer at a time of dry etching of the first layer.