Patent ID: 7943290

Claim:
A method of forming a fine pattern comprising: forming an azobenzene-functionalized polymer film on a surface of an etch layer; irradiating the azobenzene-functionalized polymer film with an interference laser beam to form a fine patterned azobenzene-functionalized polymer film having surface relief gratings by a photophysical mass transporting of the azobenzene-functionalized polymer; etching the etch layer where the patterned azobenzene-functionalized polymer film is an etching mask; and removing the patterned azobenzene-functionalized polymer film, wherein the removing the azobenzene-functionalized polymer film is performed using a heat treatment process at a temperature between ambient temperature and 425° C., wherein the heat treatment process is performed in multiple stages, each of which involves raising temperature and maintaining the raised temperature, and wherein the heat treatment process includes raising the temperature from ambient temperature to 100° C. over 30 minutes and maintaining a temperature of 100° C. for 1 hour; raising the temperature from 100° C. to 350° C. over 30 minutes and maintaining a temperature of 350° C. for 5 hours; and raising the temperature from 300° C. to 425° C. over 30 minutes and maintaining a temperature of 425° C. for 2 hours.