Patent ID: 9246071
Filing Date: 2016-01-26
CPC Classification: B82Y,G02B,G03F,H01L

Claim Text:
1. A manufacturing method of a grating comprising: forming a photoresist film on a surface of a substrate; forming a nano-pattern on the photoresist film by nano-imprint lithography; forming a patterned photoresist layer by etching the photoresist film, wherein the patterned photoresist layer defines a plurality of cavities, and a first part of the surface of the substrate is exposed through the patterned photoresist layer; covering a mask layer on the patterned photoresist layer and entire the first part of the surface of the substrate exposed through the patterned photoresist layer at the same time; forming a patterned mask layer by removing the patterned photoresist layer and portions of the mask layer on the patterned photoresist layer, wherein the patterned mask layer is retained on the first part of the surface of the substrate; etching the substrate through the patterned mask layer by reactive ion etching, wherein etching gases used in the reactive ion etching comprises carbon tetrafluoride, sulfur hexafluoride, and argon; and removing the patterned mask layer.