Patent ID: 9748012
Date: 2017-08-29
CPC Classifications: G01N,G21K

Claim:
1. A method for manufacturing a metal grating structure, comprising: forming a resist layer of one of a silicon oxide film and an alumina film on a principal plane of a silicon substrate; patterning the resist layer to remove the patterned portion of the resist layer; etching the silicon substrate corresponding to the removed portion of the resist layer to form a concave portion of a predetermined depth; forming an insulating layer on an inner surface of the concave portion in the silicon substrate in a single step, with the resist layer remaining on the principal plane, by a thermal oxidation method; removing a portion of the insulating layer formed on a bottom portion of the concave portion in a single step; and filling the concave portion with metal by an electroforming method with application of a voltage to the silicon substrate, wherein the resist layer has a thickness larger than a thickness of the insulating layer so that the resist layer remains after removing the portion of the insulating layer.