Patent ID: 11954546
Assignee: TOHOKU UNIVERSITY
Field: Micro-structural and nano-technology (Chemistry)
Classification: CPC C  G  B | IPC B  G

Claim 7:
8. A method for producing a structure for individual authentication in which a pillar pattern region including a plurality of nanopillars formed of synthetic quartz glass is formed on at least a part of a surface portion of a synthetic quartz glass substrate, wherein
in the pillar pattern region, the nanopillars have an indentation elastic modulus of 35 to 100 GPa as measured by a nanoindentation method, and
the nanopillars are plastically deformed, wherein
the method comprising the steps of:
forming an inorganic film on the surface of the synthetic quartz glass substrate, the surface being for forming the pillar pattern region;
forming an organic film on the inorganic film;
patterning the organic film to form an organic film pattern on the inorganic film;
etching the inorganic film with the organic film pattern as an etching mask to form an inorganic film pattern;
etching the surface portion of the synthetic quartz glass substrate with the organic film pattern and inorganic film pattern or the inorganic film pattern, as an etching mask, to form the pillar pattern region; and
removing the organic film pattern and inorganic film pattern or the inorganic film pattern.