Patent ID: 9272463
Filing Date: 2016-03-01
CPC Classification: B29C,G03F,H01L

Claim Text:
1. A method for forming a diffraction grating, the method comprising the steps of: preparing a mold including a first base made of a flexible material, a plurality of second bases each made of a rigid material and disposed on the first base spaced apart from each other by a predetermined distance, and a plurality of pattern portions, each of the pattern portions being on one of the second bases and including pattern corresponding to a pattern for the diffraction grating; forming a first semiconductor layer on a main surface of a substrate; forming a resin layer on the first semiconductor layer; pressing the pattern portions of the mold against the resin layer; forming the patterns for the diffraction grating in the resin layer to obtain a patterned resin layer by curing the resin layer while pressing the pattern portions against the resin layer; and forming the diffraction grating in the first semiconductor layer by etching the first semiconductor layer using the patterned resin layer as an etching mask, wherein the step of preparing a mold includes the steps of: