Patent ID: 8853096
Filing Date: 2014-10-07
Classification: B82Y,G02B,G03F,H01L

Abstract:
1. A manufacturing method of a grating, the method comprising: providing a substrate; forming a photoresist film on a surface of the substrate; forming a nano-pattern on the photoresist film by nano-imprint lithography; etching the photoresist film to form a patterned photoresist layer, 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; removing the patterned photoresist layer and the mask layer thereon to form a patterned mask layer, wherein the patterned mask layer is retained on the first part of the surface of the substrate, and a second part of the surface of the substrate is exposed through the patterned mask layer to form an exposed surface; etching the substrate through the patterned mask layer by reactive ion etching, wherein etching gases used in the reactive ion etching comprise carbon tetrafluoride (CF removing the patterned mask layer.